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/**
* Cesium - https://github.com/CesiumGS/cesium
*
* Copyright 2011-2020 Cesium Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Columbus View (Pat. Pend.)
*
* Portions licensed separately.
* See https://github.com/CesiumGS/cesium/blob/master/LICENSE.md for full licensing details.
*/
define(['./when-8d13db60', './Check-70bec281', './Math-61ede240', './Cartographic-f2a06374', './Cartesian2-16a61632', './BoundingSphere-d018a565', './Cartesian4-5af5bb24', './RuntimeError-ba10bc3e', './WebGLConstants-4c11ee5f', './ComponentDatatype-5862616f', './GeometryAttribute-1e248a71', './PrimitiveType-97893bc7', './FeatureDetection-7bd32c34', './Transforms-cd52cbaf', './buildModuleUrl-e7952659', './EncodedCartesian3-a07a0929', './IntersectionTests-813bb943', './Plane-aa6c3ce5', './WebMercatorProjection-9a70654e', './arrayRemoveDuplicates-2869246d', './ArcType-66bc286a', './EllipsoidRhumbLine-87f26cac', './EllipsoidGeodesic-9ef071e0'], function (when, Check, _Math, Cartographic, Cartesian2, BoundingSphere, Cartesian4, RuntimeError, WebGLConstants, ComponentDatatype, GeometryAttribute, PrimitiveType, FeatureDetection, Transforms, buildModuleUrl, EncodedCartesian3, IntersectionTests, Plane, WebMercatorProjection, arrayRemoveDuplicates, ArcType, EllipsoidRhumbLine, EllipsoidGeodesic) { 'use strict';
/**
* A tiling scheme for geometry referenced to a simple {@link GeographicProjection} where
* longitude and latitude are directly mapped to X and Y. This projection is commonly
* known as geographic, equirectangular, equidistant cylindrical, or plate carrée.
*
* @alias GeographicTilingScheme
* @constructor
*
* @param {Object} [options] Object with the following properties:
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid whose surface is being tiled. Defaults to
* the WGS84 ellipsoid.
* @param {Rectangle} [options.rectangle=Rectangle.MAX_VALUE] The rectangle, in radians, covered by the tiling scheme.
* @param {Number} [options.numberOfLevelZeroTilesX=2] The number of tiles in the X direction at level zero of
* the tile tree.
* @param {Number} [options.numberOfLevelZeroTilesY=1] The number of tiles in the Y direction at level zero of
* the tile tree.
*/
function GeographicTilingScheme(options) {
options = when.defaultValue(options, {});
this._ellipsoid = when.defaultValue(options.ellipsoid, Cartesian2.Ellipsoid.WGS84);
this._rectangle = when.defaultValue(options.rectangle, Cartesian2.Rectangle.MAX_VALUE);
this._projection = new BoundingSphere.GeographicProjection(this._ellipsoid);
this._numberOfLevelZeroTilesX = when.defaultValue(options.numberOfLevelZeroTilesX, 2);
this._numberOfLevelZeroTilesY = when.defaultValue(options.numberOfLevelZeroTilesY, 1);
this._customDPI = options.customDPI;
this._scaleDenominators = options.scaleDenominators;
this._tileWidth = when.defaultValue(options.tileWidth, 256);
this._tileHeight = when.defaultValue(options.tileHeight, 256);
this._beginLevel = when.defaultValue(options.beginLevel, 0);
}
Object.defineProperties(GeographicTilingScheme.prototype, {
/**
* Gets the ellipsoid that is tiled by this tiling scheme.
* @memberof GeographicTilingScheme.prototype
* @type {Ellipsoid}
*/
ellipsoid : {
get : function() {
return this._ellipsoid;
}
},
/**
* Gets the rectangle, in radians, covered by this tiling scheme.
* @memberof GeographicTilingScheme.prototype
* @type {Rectangle}
*/
rectangle : {
get : function() {
return this._rectangle;
}
},
/**
* Gets the map projection used by this tiling scheme.
* @memberof GeographicTilingScheme.prototype
* @type {MapProjection}
*/
projection : {
get : function() {
return this._projection;
}
},
beginLevel : {
get : function() {
return this._beginLevel;
}
}
});
/**
* Gets the total number of tiles in the X direction at a specified level-of-detail.
*
* @param {Number} level The level-of-detail.
* @returns {Number} The number of tiles in the X direction at the given level.
*/
GeographicTilingScheme.prototype.getNumberOfXTilesAtLevel = function(level) {
return this._numberOfLevelZeroTilesX << (level - this._beginLevel);
};
/**
* Gets the total number of tiles in the Y direction at a specified level-of-detail.
*
* @param {Number} level The level-of-detail.
* @returns {Number} The number of tiles in the Y direction at the given level.
*/
GeographicTilingScheme.prototype.getNumberOfYTilesAtLevel = function(level) {
return this._numberOfLevelZeroTilesY << (level - this._beginLevel);
};
/**
* Transforms a rectangle specified in geodetic radians to the native coordinate system
* of this tiling scheme.
*
* @param {Rectangle} rectangle The rectangle to transform.
* @param {Rectangle} [result] The instance to which to copy the result, or undefined if a new instance
* should be created.
* @returns {Rectangle} The specified 'result', or a new object containing the native rectangle if 'result'
* is undefined.
*/
GeographicTilingScheme.prototype.rectangleToNativeRectangle = function(rectangle, result) {
//>>includeStart('debug', pragmas.debug);
Check.Check.defined('rectangle', rectangle);
//>>includeEnd('debug');
var west = _Math.CesiumMath.toDegrees(rectangle.west);
var south = _Math.CesiumMath.toDegrees(rectangle.south);
var east = _Math.CesiumMath.toDegrees(rectangle.east);
var north = _Math.CesiumMath.toDegrees(rectangle.north);
if (!when.defined(result)) {
return new Cartesian2.Rectangle(west, south, east, north);
}
result.west = west;
result.south = south;
result.east = east;
result.north = north;
return result;
};
/**
* Converts tile x, y coordinates and level to a rectangle expressed in the native coordinates
* of the tiling scheme.
*
* @param {Number} x The integer x coordinate of the tile.
* @param {Number} y The integer y coordinate of the tile.
* @param {Number} level The tile level-of-detail. Zero is the least detailed.
* @param {Object} [result] The instance to which to copy the result, or undefined if a new instance
* should be created.
* @returns {Rectangle} The specified 'result', or a new object containing the rectangle
* if 'result' is undefined.
*/
GeographicTilingScheme.prototype.tileXYToNativeRectangle = function(x, y, level, result) {
var rectangleRadians = this.tileXYToRectangle(x, y, level, result);
rectangleRadians.west = _Math.CesiumMath.toDegrees(rectangleRadians.west);
rectangleRadians.south = _Math.CesiumMath.toDegrees(rectangleRadians.south);
rectangleRadians.east = _Math.CesiumMath.toDegrees(rectangleRadians.east);
rectangleRadians.north = _Math.CesiumMath.toDegrees(rectangleRadians.north);
return rectangleRadians;
};
/**
* Converts tile x, y coordinates and level to a cartographic rectangle in radians.
*
* @param {Number} x The integer x coordinate of the tile.
* @param {Number} y The integer y coordinate of the tile.
* @param {Number} level The tile level-of-detail. Zero is the least detailed.
* @param {Object} [result] The instance to which to copy the result, or undefined if a new instance
* should be created.
* @returns {Rectangle} The specified 'result', or a new object containing the rectangle
* if 'result' is undefined.
*/
GeographicTilingScheme.prototype.tileXYToRectangle = function(x, y, level, result) {
var rectangle = this._rectangle;
if(when.defined(this._customDPI) && when.defined(this._scaleDenominators)){
var resolution = this.calculateResolution(level);
var west = -_Math.CesiumMath.PI + x * this._tileWidth * resolution.x;
var east = -_Math.CesiumMath.PI + (x + 1) * this._tileWidth * resolution.x;
var north = _Math.CesiumMath.PI_OVER_TWO - y * this._tileHeight * resolution.y;
var south = _Math.CesiumMath.PI_OVER_TWO - (y + 1) * this._tileHeight * resolution.y;
if (!when.defined(result)) {
return new Cartesian2.Rectangle(west, south, east, north);
}
result.west = west;
result.south = south;
result.east = east;
result.north = north;
return result;
}
var xTiles = this.getNumberOfXTilesAtLevel(level);
var yTiles = this.getNumberOfYTilesAtLevel(level);
var xTileWidth = rectangle.width / xTiles;
var west = x * xTileWidth + rectangle.west;
var east = (x + 1) * xTileWidth + rectangle.west;
var yTileHeight = rectangle.height / yTiles;
var north = rectangle.north - y * yTileHeight;
var south = rectangle.north - (y + 1) * yTileHeight;
if (!when.defined(result)) {
result = new Cartesian2.Rectangle(west, south, east, north);
}
result.west = west;
result.south = south;
result.east = east;
result.north = north;
return result;
};
/**
* Calculates the tile x, y coordinates of the tile containing
* a given cartographic position.
*
* @param {Cartographic} position The position.
* @param {Number} level The tile level-of-detail. Zero is the least detailed.
* @param {Cartesian2} [result] The instance to which to copy the result, or undefined if a new instance
* should be created.
* @returns {Cartesian2} The specified 'result', or a new object containing the tile x, y coordinates
* if 'result' is undefined.
*/
GeographicTilingScheme.prototype.positionToTileXY = function(position, level, result) {
var rectangle = this._rectangle;
if (!Cartesian2.Rectangle.contains(rectangle, position)) {
// outside the bounds of the tiling scheme
return undefined;
}
var xTiles = this.getNumberOfXTilesAtLevel(level);
var yTiles = this.getNumberOfYTilesAtLevel(level);
var xTileWidth = rectangle.width / xTiles;
var yTileHeight = rectangle.height / yTiles;
if(when.defined(this._customDPI) && when.defined(this._scaleDenominators)) {
var resolution = this.calculateResolution(level);
xTileWidth = this._tileWidth * resolution.x;
yTileHeight = this._tileHeight * resolution.y;
}
var longitude = position.longitude;
if (rectangle.east < rectangle.west) {
longitude += _Math.CesiumMath.TWO_PI;
}
var xTileCoordinate = (longitude - rectangle.west) / xTileWidth | 0;
if (xTileCoordinate >= xTiles) {
xTileCoordinate = xTiles - 1;
}
var yTileCoordinate = (rectangle.north - position.latitude) / yTileHeight | 0;
if (yTileCoordinate >= yTiles) {
yTileCoordinate = yTiles - 1;
}
if (!when.defined(result)) {
return new Cartesian2.Cartesian2(xTileCoordinate, yTileCoordinate);
}
result.x = xTileCoordinate;
result.y = yTileCoordinate;
return result;
};
GeographicTilingScheme.prototype.calculateResolution = function(level) {
var xResolution = this._scaleDenominators[level - this._beginLevel] * 0.0254 / this._customDPI.x;
var yResolution = this._scaleDenominators[level - this._beginLevel] * 0.0254 / this._customDPI.y;
var meterPerDegreeInEquator = Cartesian2.Ellipsoid.WGS84.maximumRadius/* * CesiumMath.TWO_PI / 360.0*/;
return new Cartesian2.Cartesian2(xResolution / meterPerDegreeInEquator, yResolution / meterPerDegreeInEquator);
};
var scratchDiagonalCartesianNE = new Cartographic.Cartesian3();
var scratchDiagonalCartesianSW = new Cartographic.Cartesian3();
var scratchDiagonalCartographic = new Cartographic.Cartographic();
var scratchCenterCartesian = new Cartographic.Cartesian3();
var scratchSurfaceCartesian = new Cartographic.Cartesian3();
var scratchBoundingSphere = new BoundingSphere.BoundingSphere();
var tilingScheme = new GeographicTilingScheme();
var scratchCorners = [new Cartographic.Cartographic(), new Cartographic.Cartographic(), new Cartographic.Cartographic(), new Cartographic.Cartographic()];
var scratchTileXY = new Cartesian2.Cartesian2();
/**
* A collection of functions for approximating terrain height
* @private
*/
var ApproximateTerrainHeights = {};
/**
* Initializes the minimum and maximum terrain heights
* @return {Promise}
*/
ApproximateTerrainHeights.initialize = function() {
var initPromise = ApproximateTerrainHeights._initPromise;
if (when.defined(initPromise)) {
return initPromise;
}
initPromise = buildModuleUrl.Resource.fetchJson(buildModuleUrl.buildModuleUrl('Assets/approximateTerrainHeights.json'))
.then(function(json) {
ApproximateTerrainHeights._terrainHeights = json;
});
ApproximateTerrainHeights._initPromise = initPromise;
return initPromise;
};
/**
* Computes the minimum and maximum terrain heights for a given rectangle
* @param {Rectangle} rectangle The bounding rectangle
* @param {Ellipsoid} [ellipsoid=Ellipsoid.WGS84] The ellipsoid
* @return {{minimumTerrainHeight: Number, maximumTerrainHeight: Number}}
*/
ApproximateTerrainHeights.getMinimumMaximumHeights = function(rectangle, ellipsoid) {
//>>includeStart('debug', pragmas.debug);
Check.Check.defined('rectangle', rectangle);
if (!when.defined(ApproximateTerrainHeights._terrainHeights)) {
throw new Check.DeveloperError('You must call ApproximateTerrainHeights.initialize and wait for the promise to resolve before using this function');
}
//>>includeEnd('debug');
ellipsoid = when.defaultValue(ellipsoid, Cartesian2.Ellipsoid.WGS84);
var xyLevel = getTileXYLevel(rectangle);
// Get the terrain min/max for that tile
var minTerrainHeight = ApproximateTerrainHeights._defaultMinTerrainHeight;
var maxTerrainHeight = ApproximateTerrainHeights._defaultMaxTerrainHeight;
if (when.defined(xyLevel)) {
var key = xyLevel.level + '-' + xyLevel.x + '-' + xyLevel.y;
var heights = ApproximateTerrainHeights._terrainHeights[key];
if (when.defined(heights)) {
minTerrainHeight = heights[0];
maxTerrainHeight = heights[1];
}
// Compute min by taking the center of the NE->SW diagonal and finding distance to the surface
ellipsoid.cartographicToCartesian(Cartesian2.Rectangle.northeast(rectangle, scratchDiagonalCartographic),
scratchDiagonalCartesianNE);
ellipsoid.cartographicToCartesian(Cartesian2.Rectangle.southwest(rectangle, scratchDiagonalCartographic),
scratchDiagonalCartesianSW);
Cartographic.Cartesian3.midpoint(scratchDiagonalCartesianSW, scratchDiagonalCartesianNE, scratchCenterCartesian);
var surfacePosition = ellipsoid.scaleToGeodeticSurface(scratchCenterCartesian, scratchSurfaceCartesian);
if (when.defined(surfacePosition)) {
var distance = Cartographic.Cartesian3.distance(scratchCenterCartesian, surfacePosition);
minTerrainHeight = Math.min(minTerrainHeight, -distance);
} else {
minTerrainHeight = ApproximateTerrainHeights._defaultMinTerrainHeight;
}
}
minTerrainHeight = Math.max(ApproximateTerrainHeights._defaultMinTerrainHeight, minTerrainHeight);
return {
minimumTerrainHeight: minTerrainHeight,
maximumTerrainHeight: maxTerrainHeight
};
};
/**
* Computes the bounding sphere based on the tile heights in the rectangle
* @param {Rectangle} rectangle The bounding rectangle
* @param {Ellipsoid} [ellipsoid=Ellipsoid.WGS84] The ellipsoid
* @return {BoundingSphere} The result bounding sphere
*/
ApproximateTerrainHeights.getBoundingSphere = function(rectangle, ellipsoid) {
//>>includeStart('debug', pragmas.debug);
Check.Check.defined('rectangle', rectangle);
if (!when.defined(ApproximateTerrainHeights._terrainHeights)) {
throw new Check.DeveloperError('You must call ApproximateTerrainHeights.initialize and wait for the promise to resolve before using this function');
}
//>>includeEnd('debug');
ellipsoid = when.defaultValue(ellipsoid, Cartesian2.Ellipsoid.WGS84);
var xyLevel = getTileXYLevel(rectangle);
// Get the terrain max for that tile
var maxTerrainHeight = ApproximateTerrainHeights._defaultMaxTerrainHeight;
if (when.defined(xyLevel)) {
var key = xyLevel.level + '-' + xyLevel.x + '-' + xyLevel.y;
var heights = ApproximateTerrainHeights._terrainHeights[key];
if (when.defined(heights)) {
maxTerrainHeight = heights[1];
}
}
var result = BoundingSphere.BoundingSphere.fromRectangle3D(rectangle, ellipsoid, 0.0);
BoundingSphere.BoundingSphere.fromRectangle3D(rectangle, ellipsoid, maxTerrainHeight, scratchBoundingSphere);
return BoundingSphere.BoundingSphere.union(result, scratchBoundingSphere, result);
};
function getTileXYLevel(rectangle) {
Cartographic.Cartographic.fromRadians(rectangle.east, rectangle.north, 0.0, scratchCorners[0]);
Cartographic.Cartographic.fromRadians(rectangle.west, rectangle.north, 0.0, scratchCorners[1]);
Cartographic.Cartographic.fromRadians(rectangle.east, rectangle.south, 0.0, scratchCorners[2]);
Cartographic.Cartographic.fromRadians(rectangle.west, rectangle.south, 0.0, scratchCorners[3]);
// Determine which tile the bounding rectangle is in
var lastLevelX = 0, lastLevelY = 0;
var currentX = 0, currentY = 0;
var maxLevel = ApproximateTerrainHeights._terrainHeightsMaxLevel;
var i;
for(i = 0; i <= maxLevel; ++i) {
var failed = false;
for(var j = 0; j < 4; ++j) {
var corner = scratchCorners[j];
tilingScheme.positionToTileXY(corner, i, scratchTileXY);
if (j === 0) {
currentX = scratchTileXY.x;
currentY = scratchTileXY.y;
} else if(currentX !== scratchTileXY.x || currentY !== scratchTileXY.y) {
failed = true;
break;
}
}
if (failed) {
break;
}
lastLevelX = currentX;
lastLevelY = currentY;
}
if (i === 0) {
return undefined;
}
return {
x : lastLevelX,
y : lastLevelY,
level : (i > maxLevel) ? maxLevel : (i - 1)
};
}
ApproximateTerrainHeights._terrainHeightsMaxLevel = 6;
ApproximateTerrainHeights._defaultMaxTerrainHeight = 9000.0;
ApproximateTerrainHeights._defaultMinTerrainHeight = -100000.0;
ApproximateTerrainHeights._terrainHeights = undefined;
ApproximateTerrainHeights._initPromise = undefined;
Object.defineProperties(ApproximateTerrainHeights, {
/**
* Determines if the terrain heights are initialized and ready to use. To initialize the terrain heights,
* call {@link ApproximateTerrainHeights#initialize} and wait for the returned promise to resolve.
* @type {Boolean}
* @readonly
* @memberof ApproximateTerrainHeights
*/
initialized: {
get: function() {
return when.defined(ApproximateTerrainHeights._terrainHeights);
}
}
});
var PROJECTIONS = [BoundingSphere.GeographicProjection, WebMercatorProjection.WebMercatorProjection];
var PROJECTION_COUNT = PROJECTIONS.length;
var MITER_BREAK_SMALL = Math.cos(_Math.CesiumMath.toRadians(30.0));
var MITER_BREAK_LARGE = Math.cos(_Math.CesiumMath.toRadians(150.0));
// Initial heights for constructing the wall.
// Keeping WALL_INITIAL_MIN_HEIGHT near the ellipsoid surface helps
// prevent precision problems with planes in the shader.
// Putting the start point of a plane at ApproximateTerrainHeights._defaultMinTerrainHeight,
// which is a highly conservative bound, usually puts the plane origin several thousands
// of meters away from the actual terrain, causing floating point problems when checking
// fragments on terrain against the plane.
// Ellipsoid height is generally much closer.
// The initial max height is arbitrary.
// Both heights are corrected using ApproximateTerrainHeights for computing the actual volume geometry.
var WALL_INITIAL_MIN_HEIGHT = 0.0;
var WALL_INITIAL_MAX_HEIGHT = 1000.0;
/**
* A description of a polyline on terrain or 3D Tiles. Only to be used with {@link GroundPolylinePrimitive}.
*
* @alias GroundPolylineGeometry
* @constructor
*
* @param {Object} options Options with the following properties:
* @param {Cartesian3[]} options.positions An array of {@link Cartesian3} defining the polyline's points. Heights above the ellipsoid will be ignored.
* @param {Number} [options.width=1.0] The screen space width in pixels.
* @param {Number} [options.granularity=9999.0] The distance interval in meters used for interpolating options.points. Defaults to 9999.0 meters. Zero indicates no interpolation.
* @param {Boolean} [options.loop=false] Whether during geometry creation a line segment will be added between the last and first line positions to make this Polyline a loop.
* @param {ArcType} [options.arcType=ArcType.GEODESIC] The type of line the polyline segments must follow. Valid options are {@link ArcType.GEODESIC} and {@link ArcType.RHUMB}.
*
* @exception {DeveloperError} At least two positions are required.
*
* @see GroundPolylinePrimitive
*
* @example
* var positions = Cesium.Cartesian3.fromDegreesArray([
* -112.1340164450331, 36.05494287836128,
* -112.08821010582645, 36.097804071380715,
* -112.13296079730024, 36.168769146801104
* ]);
*
* var geometry = new Cesium.GroundPolylineGeometry({
* positions : positions
* });
*/
function GroundPolylineGeometry(options) {
options = when.defaultValue(options, when.defaultValue.EMPTY_OBJECT);
var positions = options.positions;
//>>includeStart('debug', pragmas.debug);
if ((!when.defined(positions)) || (positions.length < 2)) {
throw new Check.DeveloperError('At least two positions are required.');
}
if (when.defined(options.arcType) && options.arcType !== ArcType.ArcType.GEODESIC && options.arcType !== ArcType.ArcType.RHUMB) {
throw new Check.DeveloperError('Valid options for arcType are ArcType.GEODESIC and ArcType.RHUMB.');
}
//>>includeEnd('debug');
/**
* The screen space width in pixels.
* @type {Number}
*/
this.width = when.defaultValue(options.width, 1.0); // Doesn't get packed, not necessary for computing geometry.
this._positions = positions;
/**
* The distance interval used for interpolating options.points. Zero indicates no interpolation.
* Default of 9999.0 allows centimeter accuracy with 32 bit floating point.
* @type {Boolean}
* @default 9999.0
*/
this.granularity = when.defaultValue(options.granularity, 9999.0);
/**
* Whether during geometry creation a line segment will be added between the last and first line positions to make this Polyline a loop.
* If the geometry has two positions this parameter will be ignored.
* @type {Boolean}
* @default false
*/
this.loop = when.defaultValue(options.loop, false);
/**
* The type of path the polyline must follow. Valid options are {@link ArcType.GEODESIC} and {@link ArcType.RHUMB}.
* @type {ArcType}
* @default ArcType.GEODESIC
*/
this.arcType = when.defaultValue(options.arcType, ArcType.ArcType.GEODESIC);
this._ellipsoid = when.defaultValue(options.ellipsoid, Cartesian2.Ellipsoid.WGS84);
// MapProjections can't be packed, so store the index to a known MapProjection.
this._projectionIndex = 0;
this._workerName = 'createGroundPolylineGeometry';
// Used by GroundPolylinePrimitive to signal worker that scenemode is 3D only.
this._scene3DOnly = false;
}
Object.defineProperties(GroundPolylineGeometry.prototype, {
/**
* The number of elements used to pack the object into an array.
* @memberof GroundPolylineGeometry.prototype
* @type {Number}
* @readonly
* @private
*/
packedLength: {
get: function() {
return 1.0 + this._positions.length * 3 + 1.0 + 1.0 + 1.0 + Cartesian2.Ellipsoid.packedLength + 1.0 + 1.0;
}
}
});
/**
* Set the GroundPolylineGeometry's projection and ellipsoid.
* Used by GroundPolylinePrimitive to signal scene information to the geometry for generating 2D attributes.
*
* @param {GroundPolylineGeometry} groundPolylineGeometry GroundPolylinGeometry describing a polyline on terrain or 3D Tiles.
* @param {Projection} mapProjection A MapProjection used for projecting cartographic coordinates to 2D.
* @private
*/
GroundPolylineGeometry.setProjectionAndEllipsoid = function(groundPolylineGeometry, mapProjection) {
var projectionIndex = 0;
for (var i = 0; i < PROJECTION_COUNT; i++) {
if (mapProjection instanceof PROJECTIONS[i]) {
projectionIndex = i;
break;
}
}
groundPolylineGeometry._projectionIndex = projectionIndex;
groundPolylineGeometry._ellipsoid = mapProjection.ellipsoid;
};
var cart3Scratch1 = new Cartographic.Cartesian3();
var cart3Scratch2 = new Cartographic.Cartesian3();
var cart3Scratch3 = new Cartographic.Cartesian3();
function computeRightNormal(start, end, maxHeight, ellipsoid, result) {
var startBottom = getPosition(ellipsoid, start, 0.0, cart3Scratch1);
var startTop = getPosition(ellipsoid, start, maxHeight, cart3Scratch2);
var endBottom = getPosition(ellipsoid, end, 0.0, cart3Scratch3);
var up = direction(startTop, startBottom, cart3Scratch2);
var forward = direction(endBottom, startBottom, cart3Scratch3);
Cartographic.Cartesian3.cross(forward, up, result);
return Cartographic.Cartesian3.normalize(result, result);
}
var interpolatedCartographicScratch = new Cartographic.Cartographic();
var interpolatedBottomScratch = new Cartographic.Cartesian3();
var interpolatedTopScratch = new Cartographic.Cartesian3();
var interpolatedNormalScratch = new Cartographic.Cartesian3();
function interpolateSegment(start, end, minHeight, maxHeight, granularity, arcType, ellipsoid, normalsArray, bottomPositionsArray, topPositionsArray, cartographicsArray) {
if (granularity === 0.0) {
return;
}
var ellipsoidLine;
if (arcType === ArcType.ArcType.GEODESIC) {
ellipsoidLine = new EllipsoidGeodesic.EllipsoidGeodesic(start, end, ellipsoid);
} else if (arcType === ArcType.ArcType.RHUMB) {
ellipsoidLine = new EllipsoidRhumbLine.EllipsoidRhumbLine(start, end, ellipsoid);
}
var surfaceDistance = ellipsoidLine.surfaceDistance;
if (surfaceDistance < granularity) {
return;
}
// Compute rightwards normal applicable at all interpolated points
var interpolatedNormal = computeRightNormal(start, end, maxHeight, ellipsoid, interpolatedNormalScratch);
var segments = Math.ceil(surfaceDistance / granularity);
var interpointDistance = surfaceDistance / segments;
var distanceFromStart = interpointDistance;
var pointsToAdd = segments - 1;
var packIndex = normalsArray.length;
for (var i = 0; i < pointsToAdd; i++) {
var interpolatedCartographic = ellipsoidLine.interpolateUsingSurfaceDistance(distanceFromStart, interpolatedCartographicScratch);
var interpolatedBottom = getPosition(ellipsoid, interpolatedCartographic, minHeight, interpolatedBottomScratch);
var interpolatedTop = getPosition(ellipsoid, interpolatedCartographic, maxHeight, interpolatedTopScratch);
Cartographic.Cartesian3.pack(interpolatedNormal, normalsArray, packIndex);
Cartographic.Cartesian3.pack(interpolatedBottom, bottomPositionsArray, packIndex);
Cartographic.Cartesian3.pack(interpolatedTop, topPositionsArray, packIndex);
cartographicsArray.push(interpolatedCartographic.latitude);
cartographicsArray.push(interpolatedCartographic.longitude);
packIndex += 3;
distanceFromStart += interpointDistance;
}
}
var heightlessCartographicScratch = new Cartographic.Cartographic();
function getPosition(ellipsoid, cartographic, height, result) {
Cartographic.Cartographic.clone(cartographic, heightlessCartographicScratch);
heightlessCartographicScratch.height = height;
return Cartographic.Cartographic.toCartesian(heightlessCartographicScratch, ellipsoid, result);
}
/**
* Stores the provided instance into the provided array.
*
* @param {PolygonGeometry} value The value to pack.
* @param {Number[]} array The array to pack into.
* @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
*
* @returns {Number[]} The array that was packed into
*/
GroundPolylineGeometry.pack = function(value, array, startingIndex) {
//>>includeStart('debug', pragmas.debug);
Check.Check.typeOf.object('value', value);
Check.Check.defined('array', array);
//>>includeEnd('debug');
var index = when.defaultValue(startingIndex, 0);
var positions = value._positions;
var positionsLength = positions.length;
array[index++] = positionsLength;
for (var i = 0; i < positionsLength; ++i) {
var cartesian = positions[i];
Cartographic.Cartesian3.pack(cartesian, array, index);
index += 3;
}
array[index++] = value.granularity;
array[index++] = value.loop ? 1.0 : 0.0;
array[index++] = value.arcType;
Cartesian2.Ellipsoid.pack(value._ellipsoid, array, index);
index += Cartesian2.Ellipsoid.packedLength;
array[index++] = value._projectionIndex;
array[index++] = value._scene3DOnly ? 1.0 : 0.0;
return array;
};
/**
* Retrieves an instance from a packed array.
*
* @param {Number[]} array The packed array.
* @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
* @param {PolygonGeometry} [result] The object into which to store the result.
*/
GroundPolylineGeometry.unpack = function(array, startingIndex, result) {
//>>includeStart('debug', pragmas.debug);
Check.Check.defined('array', array);
//>>includeEnd('debug');
var index = when.defaultValue(startingIndex, 0);
var positionsLength = array[index++];
var positions = new Array(positionsLength);
for (var i = 0; i < positionsLength; i++) {
positions[i] = Cartographic.Cartesian3.unpack(array, index);
index += 3;
}
var granularity = array[index++];
var loop = array[index++] === 1.0;
var arcType = array[index++];
var ellipsoid = Cartesian2.Ellipsoid.unpack(array, index);
index += Cartesian2.Ellipsoid.packedLength;
var projectionIndex = array[index++];
var scene3DOnly = (array[index++] === 1.0);
if (!when.defined(result)) {
var geometry = new GroundPolylineGeometry({
positions : positions,
granularity : granularity,
loop : loop,
arcType : arcType,
ellipsoid : ellipsoid
});
geometry._projectionIndex = projectionIndex;
geometry._scene3DOnly = scene3DOnly;
return geometry;
}
result._positions = positions;
result.granularity = granularity;
result.loop = loop;
result.arcType = arcType;
result._ellipsoid = ellipsoid;
result._projectionIndex = projectionIndex;
result._scene3DOnly = scene3DOnly;
return result;
};
function direction(target, origin, result) {
Cartographic.Cartesian3.subtract(target, origin, result);
Cartographic.Cartesian3.normalize(result, result);
return result;
}
var toPreviousScratch = new Cartographic.Cartesian3();
var toNextScratch = new Cartographic.Cartesian3();
var forwardScratch = new Cartographic.Cartesian3();
var coplanarNormalScratch = new Cartographic.Cartesian3();
var coplanarPlaneScratch = new Plane.Plane(Cartographic.Cartesian3.UNIT_X, 0.0);
var vertexUpScratch = new Cartographic.Cartesian3();
var cosine90 = 0.0;
function computeVertexMiterNormal(previousBottom, vertexBottom, vertexTop, nextBottom, result) {
var up = direction(vertexTop, vertexBottom, vertexUpScratch);
var toPrevious = direction(previousBottom, vertexBottom, toPreviousScratch);
var toNext = direction(nextBottom, vertexBottom, toNextScratch);
// Check if points are coplanar in a right-side-pointing plane that contains "up."
// This is roughly equivalent to the points being colinear in cartographic space.
var coplanarNormal = Cartographic.Cartesian3.cross(up, toPrevious, coplanarNormalScratch);
coplanarNormal = Cartographic.Cartesian3.normalize(coplanarNormal, coplanarNormal);
var coplanarPlane = Plane.Plane.fromPointNormal(vertexBottom, coplanarNormal, coplanarPlaneScratch);
var nextBottomDistance = Plane.Plane.getPointDistance(coplanarPlane, nextBottom);
if (_Math.CesiumMath.equalsEpsilon(nextBottomDistance, 0.0, _Math.CesiumMath.EPSILON7)) {
// If the points are coplanar, point the normal in the direction of the plane
Cartographic.Cartesian3.clone(coplanarNormal, result);
return result;
}
// Average directions to previous and to next
result = Cartographic.Cartesian3.add(toNext, toPrevious, result);
result = Cartographic.Cartesian3.normalize(result, result);
// Rotate this direction to be orthogonal to up
var forward = Cartographic.Cartesian3.cross(up, result, forwardScratch);
Cartographic.Cartesian3.normalize(forward, forward);
Cartographic.Cartesian3.cross(forward, up, result);
Cartographic.Cartesian3.normalize(result, result);
// Flip the normal if it isn't pointing roughly bound right (aka if forward is pointing more "backwards")
if (Cartographic.Cartesian3.dot(toNext, forward) < cosine90) {
result = Cartographic.Cartesian3.negate(result, result);
}
return result;
}
var XZ_PLANE = Plane.Plane.fromPointNormal(Cartographic.Cartesian3.ZERO, Cartographic.Cartesian3.UNIT_Y);
var previousBottomScratch = new Cartographic.Cartesian3();
var vertexBottomScratch = new Cartographic.Cartesian3();
var vertexTopScratch = new Cartographic.Cartesian3();
var nextBottomScratch = new Cartographic.Cartesian3();
var vertexNormalScratch = new Cartographic.Cartesian3();
var intersectionScratch = new Cartographic.Cartesian3();
var cartographicScratch0 = new Cartographic.Cartographic();
var cartographicScratch1 = new Cartographic.Cartographic();
var cartographicIntersectionScratch = new Cartographic.Cartographic();
/**
* Computes shadow volumes for the ground polyline, consisting of its vertices, indices, and a bounding sphere.
* Vertices are "fat," packing all the data needed in each volume to describe a line on terrain or 3D Tiles.
* Should not be called independent of {@link GroundPolylinePrimitive}.
*
* @param {GroundPolylineGeometry} groundPolylineGeometry
* @private
*/
GroundPolylineGeometry.createGeometry = function(groundPolylineGeometry) {
var compute2dAttributes = !groundPolylineGeometry._scene3DOnly;
var loop = groundPolylineGeometry.loop;
var ellipsoid = groundPolylineGeometry._ellipsoid;
var granularity = groundPolylineGeometry.granularity;
var arcType = groundPolylineGeometry.arcType;
var projection = new PROJECTIONS[groundPolylineGeometry._projectionIndex](ellipsoid);
var minHeight = WALL_INITIAL_MIN_HEIGHT;
var maxHeight = WALL_INITIAL_MAX_HEIGHT;
var index;
var i;
var positions = groundPolylineGeometry._positions;
var positionsLength = positions.length;
if (positionsLength === 2) {
loop = false;
}
// Split positions across the IDL and the Prime Meridian as well.
// Split across prime meridian because very large geometries crossing the Prime Meridian but not the IDL
// may get split by the plane of IDL + Prime Meridian.
var p0;
var p1;
var c0;
var c1;
var rhumbLine = new EllipsoidRhumbLine.EllipsoidRhumbLine(undefined, undefined, ellipsoid);
var intersection;
var intersectionCartographic;
var intersectionLongitude;
var splitPositions = [positions[0]];
for (i = 0; i < positionsLength - 1; i++) {
p0 = positions[i];
p1 = positions[i + 1];
intersection = IntersectionTests.IntersectionTests.lineSegmentPlane(p0, p1, XZ_PLANE, intersectionScratch);
if (when.defined(intersection) &&
!Cartographic.Cartesian3.equalsEpsilon(intersection, p0, _Math.CesiumMath.EPSILON7) &&
!Cartographic.Cartesian3.equalsEpsilon(intersection, p1, _Math.CesiumMath.EPSILON7)) {
if (groundPolylineGeometry.arcType === ArcType.ArcType.GEODESIC) {
splitPositions.push(Cartographic.Cartesian3.clone(intersection));
} else if (groundPolylineGeometry.arcType === ArcType.ArcType.RHUMB) {
intersectionLongitude = ellipsoid.cartesianToCartographic(intersection, cartographicScratch0).longitude;
c0 = ellipsoid.cartesianToCartographic(p0, cartographicScratch0);
c1 = ellipsoid.cartesianToCartographic(p1, cartographicScratch1);
rhumbLine.setEndPoints(c0, c1);
intersectionCartographic = rhumbLine.findIntersectionWithLongitude(intersectionLongitude, cartographicIntersectionScratch);
intersection = ellipsoid.cartographicToCartesian(intersectionCartographic, intersectionScratch);
if (when.defined(intersection) &&
!Cartographic.Cartesian3.equalsEpsilon(intersection, p0, _Math.CesiumMath.EPSILON7) &&
!Cartographic.Cartesian3.equalsEpsilon(intersection, p1, _Math.CesiumMath.EPSILON7)) {
splitPositions.push(Cartographic.Cartesian3.clone(intersection));
}
}
}
splitPositions.push(p1);
}
if (loop) {
p0 = positions[positionsLength - 1];
p1 = positions[0];
intersection = IntersectionTests.IntersectionTests.lineSegmentPlane(p0, p1, XZ_PLANE, intersectionScratch);
if (when.defined(intersection) &&
!Cartographic.Cartesian3.equalsEpsilon(intersection, p0, _Math.CesiumMath.EPSILON7) &&
!Cartographic.Cartesian3.equalsEpsilon(intersection, p1, _Math.CesiumMath.EPSILON7)) {
if (groundPolylineGeometry.arcType === ArcType.ArcType.GEODESIC) {
splitPositions.push(Cartographic.Cartesian3.clone(intersection));
} else if (groundPolylineGeometry.arcType === ArcType.ArcType.RHUMB) {
intersectionLongitude = ellipsoid.cartesianToCartographic(intersection, cartographicScratch0).longitude;
c0 = ellipsoid.cartesianToCartographic(p0, cartographicScratch0);
c1 = ellipsoid.cartesianToCartographic(p1, cartographicScratch1);
rhumbLine.setEndPoints(c0, c1);
intersectionCartographic = rhumbLine.findIntersectionWithLongitude(intersectionLongitude, cartographicIntersectionScratch);
intersection = ellipsoid.cartographicToCartesian(intersectionCartographic, intersectionScratch);
if (when.defined(intersection) &&
!Cartographic.Cartesian3.equalsEpsilon(intersection, p0, _Math.CesiumMath.EPSILON7) &&
!Cartographic.Cartesian3.equalsEpsilon(intersection, p1, _Math.CesiumMath.EPSILON7)) {
splitPositions.push(Cartographic.Cartesian3.clone(intersection));
}
}
}
}
var cartographicsLength = splitPositions.length;
var cartographics = new Array(cartographicsLength);
for (i = 0; i < cartographicsLength; i++) {
var cartographic = Cartographic.Cartographic.fromCartesian(splitPositions[i], ellipsoid);
cartographic.height = 0.0;
cartographics[i] = cartographic;
}
cartographics = arrayRemoveDuplicates.arrayRemoveDuplicates(cartographics, Cartographic.Cartographic.equalsEpsilon);
cartographicsLength = cartographics.length;
if (cartographicsLength < 2) {
return undefined;
}
/**** Build heap-side arrays for positions, interpolated cartographics, and normals from which to compute vertices ****/
// We build a "wall" and then decompose it into separately connected component "volumes" because we need a lot
// of information about the wall. Also, this simplifies interpolation.
// Convention: "next" and "end" are locally forward to each segment of the wall,
// and we are computing normals pointing towards the local right side of the vertices in each segment.
var cartographicsArray = [];
var normalsArray = [];
var bottomPositionsArray = [];
var topPositionsArray = [];
var previousBottom = previousBottomScratch;
var vertexBottom = vertexBottomScratch;
var vertexTop = vertexTopScratch;
var nextBottom = nextBottomScratch;
var vertexNormal = vertexNormalScratch;
// First point - either loop or attach a "perpendicular" normal
var startCartographic = cartographics[0];
var nextCartographic = cartographics[1];
var prestartCartographic = cartographics[cartographicsLength - 1];
previousBottom = getPosition(ellipsoid, prestartCartographic, minHeight, previousBottom);
nextBottom = getPosition(ellipsoid, nextCartographic, minHeight, nextBottom);
vertexBottom = getPosition(ellipsoid, startCartographic, minHeight, vertexBottom);
vertexTop = getPosition(ellipsoid, startCartographic, maxHeight, vertexTop);
if (loop) {
vertexNormal = computeVertexMiterNormal(previousBottom, vertexBottom, vertexTop, nextBottom, vertexNormal);
} else {
vertexNormal = computeRightNormal(startCartographic, nextCartographic, maxHeight, ellipsoid, vertexNormal);
}
Cartographic.Cartesian3.pack(vertexNormal, normalsArray, 0);
Cartographic.Cartesian3.pack(vertexBottom, bottomPositionsArray, 0);
Cartographic.Cartesian3.pack(vertexTop, topPositionsArray, 0);
cartographicsArray.push(startCartographic.latitude);
cartographicsArray.push(startCartographic.longitude);
interpolateSegment(startCartographic, nextCartographic, minHeight, maxHeight, granularity, arcType, ellipsoid, normalsArray, bottomPositionsArray, topPositionsArray, cartographicsArray);
// All inbetween points
for (i = 1; i < cartographicsLength - 1; ++i) {
previousBottom = Cartographic.Cartesian3.clone(vertexBottom, previousBottom);
vertexBottom = Cartographic.Cartesian3.clone(nextBottom, vertexBottom);
var vertexCartographic = cartographics[i];
getPosition(ellipsoid, vertexCartographic, maxHeight, vertexTop);
getPosition(ellipsoid, cartographics[i + 1], minHeight, nextBottom);
computeVertexMiterNormal(previousBottom, vertexBottom, vertexTop, nextBottom, vertexNormal);
index = normalsArray.length;
Cartographic.Cartesian3.pack(vertexNormal, normalsArray, index);
Cartographic.Cartesian3.pack(vertexBottom, bottomPositionsArray, index);
Cartographic.Cartesian3.pack(vertexTop, topPositionsArray, index);
cartographicsArray.push(vertexCartographic.latitude);
cartographicsArray.push(vertexCartographic.longitude);
interpolateSegment(cartographics[i], cartographics[i + 1], minHeight, maxHeight, granularity, arcType, ellipsoid, normalsArray, bottomPositionsArray, topPositionsArray, cartographicsArray);
}
// Last point - either loop or attach a normal "perpendicular" to the wall.
var endCartographic = cartographics[cartographicsLength - 1];
var preEndCartographic = cartographics[cartographicsLength - 2];
vertexBottom = getPosition(ellipsoid, endCartographic, minHeight, vertexBottom);
vertexTop = getPosition(ellipsoid, endCartographic, maxHeight, vertexTop);
if (loop) {
var postEndCartographic = cartographics[0];
previousBottom = getPosition(ellipsoid, preEndCartographic, minHeight, previousBottom);
nextBottom = getPosition(ellipsoid, postEndCartographic, minHeight, nextBottom);
vertexNormal = computeVertexMiterNormal(previousBottom, vertexBottom, vertexTop, nextBottom, vertexNormal);
} else {
vertexNormal = computeRightNormal(preEndCartographic, endCartographic, maxHeight, ellipsoid, vertexNormal);
}
index = normalsArray.length;
Cartographic.Cartesian3.pack(vertexNormal, normalsArray, index);
Cartographic.Cartesian3.pack(vertexBottom, bottomPositionsArray, index);
Cartographic.Cartesian3.pack(vertexTop, topPositionsArray, index);
cartographicsArray.push(endCartographic.latitude);
cartographicsArray.push(endCartographic.longitude);
if (loop) {
interpolateSegment(endCartographic, startCartographic, minHeight, maxHeight, granularity, arcType, ellipsoid, normalsArray, bottomPositionsArray, topPositionsArray, cartographicsArray);
index = normalsArray.length;
for (i = 0; i < 3; ++i) {
normalsArray[index + i] = normalsArray[i];
bottomPositionsArray[index + i] = bottomPositionsArray[i];
topPositionsArray[index + i] = topPositionsArray[i];
}
cartographicsArray.push(startCartographic.latitude);
cartographicsArray.push(startCartographic.longitude);
}
return generateGeometryAttributes(loop, projection, bottomPositionsArray, topPositionsArray, normalsArray, cartographicsArray, compute2dAttributes);
};
// If the end normal angle is too steep compared to the direction of the line segment,
// "break" the miter by rotating the normal 90 degrees around the "up" direction at the point
// For ultra precision we would want to project into a plane, but in practice this is sufficient.
var lineDirectionScratch = new Cartographic.Cartesian3();
var matrix3Scratch = new BoundingSphere.Matrix3();
var quaternionScratch = new Transforms.Quaternion();
function breakMiter(endGeometryNormal, startBottom, endBottom, endTop) {
var lineDirection = direction(endBottom, startBottom, lineDirectionScratch);
var dot = Cartographic.Cartesian3.dot(lineDirection, endGeometryNormal);
if (dot > MITER_BREAK_SMALL || dot < MITER_BREAK_LARGE) {
var vertexUp = direction(endTop, endBottom, vertexUpScratch);
var angle = dot < MITER_BREAK_LARGE ? _Math.CesiumMath.PI_OVER_TWO : -_Math.CesiumMath.PI_OVER_TWO;
var quaternion = Transforms.Quaternion.fromAxisAngle(vertexUp, angle, quaternionScratch);
var rotationMatrix = BoundingSphere.Matrix3.fromQuaternion(quaternion, matrix3Scratch);
BoundingSphere.Matrix3.multiplyByVector(rotationMatrix, endGeometryNormal, endGeometryNormal);
return true;
}
return false;
}
var endPosCartographicScratch = new Cartographic.Cartographic();
var normalStartpointScratch = new Cartographic.Cartesian3();
var normalEndpointScratch = new Cartographic.Cartesian3();
function projectNormal(projection, cartographic, normal, projectedPosition, result) {
var position = Cartographic.Cartographic.toCartesian(cartographic, projection._ellipsoid, normalStartpointScratch);
var normalEndpoint = Cartographic.Cartesian3.add(position, normal, normalEndpointScratch);
var flipNormal = false;
var ellipsoid = projection._ellipsoid;
var normalEndpointCartographic = ellipsoid.cartesianToCartographic(normalEndpoint, endPosCartographicScratch);
// If normal crosses the IDL, go the other way and flip the result.
// In practice this almost never happens because the cartographic start
// and end points of each segment are "nudged" to be on the same side
// of the IDL and slightly away from the IDL.
if (Math.abs(cartographic.longitude - normalEndpointCartographic.longitude) > _Math.CesiumMath.PI_OVER_TWO) {
flipNormal = true;
normalEndpoint = Cartographic.Cartesian3.subtract(position, normal, normalEndpointScratch);
normalEndpointCartographic = ellipsoid.cartesianToCartographic(normalEndpoint, endPosCartographicScratch);
}
normalEndpointCartographic.height = 0.0;
var normalEndpointProjected = projection.project(normalEndpointCartographic, result);
result = Cartographic.Cartesian3.subtract(normalEndpointProjected, projectedPosition, result);
result.z = 0.0;
result = Cartographic.Cartesian3.normalize(result, result);
if (flipNormal) {
Cartographic.Cartesian3.negate(result, result);
}
return result;
}
var adjustHeightNormalScratch = new Cartographic.Cartesian3();
var adjustHeightOffsetScratch = new Cartographic.Cartesian3();
function adjustHeights(bottom, top, minHeight, maxHeight, adjustHeightBottom, adjustHeightTop) {
// bottom and top should be at WALL_INITIAL_MIN_HEIGHT and WALL_INITIAL_MAX_HEIGHT, respectively
var adjustHeightNormal = Cartographic.Cartesian3.subtract(top, bottom, adjustHeightNormalScratch);
Cartographic.Cartesian3.normalize(adjustHeightNormal, adjustHeightNormal);
var distanceForBottom = minHeight - WALL_INITIAL_MIN_HEIGHT;
var adjustHeightOffset = Cartographic.Cartesian3.multiplyByScalar(adjustHeightNormal, distanceForBottom, adjustHeightOffsetScratch);
Cartographic.Cartesian3.add(bottom, adjustHeightOffset, adjustHeightBottom);
var distanceForTop = maxHeight - WALL_INITIAL_MAX_HEIGHT;
adjustHeightOffset = Cartographic.Cartesian3.multiplyByScalar(adjustHeightNormal, distanceForTop, adjustHeightOffsetScratch);
Cartographic.Cartesian3.add(top, adjustHeightOffset, adjustHeightTop);
}
var nudgeDirectionScratch = new Cartographic.Cartesian3();
function nudgeXZ(start, end) {
var startToXZdistance = Plane.Plane.getPointDistance(XZ_PLANE, start);
var endToXZdistance = Plane.Plane.getPointDistance(XZ_PLANE, end);
var offset = nudgeDirectionScratch;
// Larger epsilon than what's used in GeometryPipeline, a centimeter in world space
if (_Math.CesiumMath.equalsEpsilon(startToXZdistance, 0.0, _Math.CesiumMath.EPSILON2)) {
offset = direction(end, start, offset);
Cartographic.Cartesian3.multiplyByScalar(offset, _Math.CesiumMath.EPSILON2, offset);
Cartographic.Cartesian3.add(start, offset, start);
} else if (_Math.CesiumMath.equalsEpsilon(endToXZdistance, 0.0, _Math.CesiumMath.EPSILON2)) {
offset = direction(start, end, offset);
Cartographic.Cartesian3.multiplyByScalar(offset, _Math.CesiumMath.EPSILON2, offset);
Cartographic.Cartesian3.add(end, offset, end);
}
}
// "Nudge" cartographic coordinates so start and end are on the same side of the IDL.
// Nudge amounts are tiny, basically just an IDL flip.
// Only used for 2D/CV.
function nudgeCartographic(start, end) {
var absStartLon = Math.abs(start.longitude);
var absEndLon = Math.abs(end.longitude);
if (_Math.CesiumMath.equalsEpsilon(absStartLon, _Math.CesiumMath.PI, _Math.CesiumMath.EPSILON11)) {
var endSign = _Math.CesiumMath.sign(end.longitude);
start.longitude = endSign * (absStartLon - _Math.CesiumMath.EPSILON11);
return 1;
} else if (_Math.CesiumMath.equalsEpsilon(absEndLon, _Math.CesiumMath.PI, _Math.CesiumMath.EPSILON11)) {
var startSign = _Math.CesiumMath.sign(start.longitude);
end.longitude = startSign * (absEndLon - _Math.CesiumMath.EPSILON11);
return 2;
}
return 0;
}
var startCartographicScratch = new Cartographic.Cartographic();
var endCartographicScratch = new Cartographic.Cartographic();
var segmentStartTopScratch = new Cartographic.Cartesian3();
var segmentEndTopScratch = new Cartographic.Cartesian3();
var segmentStartBottomScratch = new Cartographic.Cartesian3();
var segmentEndBottomScratch = new Cartographic.Cartesian3();
var segmentStartNormalScratch = new Cartographic.Cartesian3();
var segmentEndNormalScratch = new Cartographic.Cartesian3();
var getHeightCartographics = [startCartographicScratch, endCartographicScratch];
var getHeightRectangleScratch = new Cartesian2.Rectangle();
var adjustHeightStartTopScratch = new Cartographic.Cartesian3();
var adjustHeightEndTopScratch = new Cartographic.Cartesian3();
var adjustHeightStartBottomScratch = new Cartographic.Cartesian3();
var adjustHeightEndBottomScratch = new Cartographic.Cartesian3();
var segmentStart2DScratch = new Cartographic.Cartesian3();
var segmentEnd2DScratch = new Cartographic.Cartesian3();
var segmentStartNormal2DScratch = new Cartographic.Cartesian3();
var segmentEndNormal2DScratch = new Cartographic.Cartesian3();
var offsetScratch = new Cartographic.Cartesian3();
var startUpScratch = new Cartographic.Cartesian3();
var endUpScratch = new Cartographic.Cartesian3();
var rightScratch = new Cartographic.Cartesian3();
var startPlaneNormalScratch = new Cartographic.Cartesian3();
var endPlaneNormalScratch = new Cartographic.Cartesian3();
var encodeScratch = new EncodedCartesian3.EncodedCartesian3();
var encodeScratch2D = new EncodedCartesian3.EncodedCartesian3();
var forwardOffset2DScratch = new Cartographic.Cartesian3();
var right2DScratch = new Cartographic.Cartesian3();
var normalNudgeScratch = new Cartographic.Cartesian3();
var scratchBoundingSpheres = [new BoundingSphere.BoundingSphere(), new BoundingSphere.BoundingSphere()];
// Winding order is reversed so each segment's volume is inside-out
var REFERENCE_INDICES = [
0, 2, 1, 0, 3, 2, // right
0, 7, 3, 0, 4, 7, // start
0, 5, 4, 0, 1, 5, // bottom
5, 7, 4, 5, 6, 7, // left
5, 2, 6, 5, 1, 2, // end
3, 6, 2, 3, 7, 6 // top
];
var REFERENCE_INDICES_LENGTH = REFERENCE_INDICES.length;
// Decompose the "wall" into a series of shadow volumes.
// Each shadow volume's vertices encode a description of the line it contains,
// including mitering planes at the end points, a plane along the line itself,
// and attributes for computing length-wise texture coordinates.
function generateGeometryAttributes(loop, projection, bottomPositionsArray, topPositionsArray, normalsArray, cartographicsArray, compute2dAttributes) {
var i;
var index;
var ellipsoid = projection._ellipsoid;
// Each segment will have 8 vertices
var segmentCount = (bottomPositionsArray.length / 3) - 1;
var vertexCount = segmentCount * 8;
var arraySizeVec4 = vertexCount * 4;
var indexCount = segmentCount * 36;
var indices = vertexCount > 65535 ? new Uint32Array(indexCount) : new Uint16Array(indexCount);
var positionsArray = new Float64Array(vertexCount * 3);
var startHiAndForwardOffsetX = new Float32Array(arraySizeVec4);
var startLoAndForwardOffsetY = new Float32Array(arraySizeVec4);
var startNormalAndForwardOffsetZ = new Float32Array(arraySizeVec4);
var endNormalAndTextureCoordinateNormalizationX = new Float32Array(arraySizeVec4);
var rightNormalAndTextureCoordinateNormalizationY = new Float32Array(arraySizeVec4);
var startHiLo2D;
var offsetAndRight2D;
var startEndNormals2D;
var texcoordNormalization2D;
if (compute2dAttributes) {
startHiLo2D = new Float32Array(arraySizeVec4);
offsetAndRight2D = new Float32Array(arraySizeVec4);
startEndNormals2D = new Float32Array(arraySizeVec4);
texcoordNormalization2D = new Float32Array(vertexCount * 2);
}
/*** Compute total lengths for texture coordinate normalization ***/
// 2D
var cartographicsLength = cartographicsArray.length / 2;
var length2D = 0.0;
var startCartographic = startCartographicScratch;
startCartographic.height = 0.0;
var endCartographic = endCartographicScratch;
endCartographic.height = 0.0;
var segmentStartCartesian = segmentStartTopScratch;
var segmentEndCartesian = segmentEndTopScratch;
if (compute2dAttributes) {
index = 0;
for (i = 1; i < cartographicsLength; i++) {
// Don't clone anything from previous segment b/c possible IDL touch
startCartographic.latitude = cartographicsArray[index];
startCartographic.longitude = cartographicsArray[index + 1];
endCartographic.latitude = cartographicsArray[index + 2];
endCartographic.longitude = cartographicsArray[index + 3];
segmentStartCartesian = projection.project(startCartographic, segmentStartCartesian);
segmentEndCartesian = projection.project(endCartographic, segmentEndCartesian);
length2D += Cartographic.Cartesian3.distance(segmentStartCartesian, segmentEndCartesian);
index += 2;
}
}
// 3D
var positionsLength = topPositionsArray.length / 3;
segmentEndCartesian = Cartographic.Cartesian3.unpack(topPositionsArray, 0, segmentEndCartesian);
var length3D = 0.0;
index = 3;
for (i = 1; i < positionsLength; i++) {
segmentStartCartesian = Cartographic.Cartesian3.clone(segmentEndCartesian, segmentStartCartesian);
segmentEndCartesian = Cartographic.Cartesian3.unpack(topPositionsArray, index, segmentEndCartesian);
length3D += Cartographic.Cartesian3.distance(segmentStartCartesian, segmentEndCartesian);
index += 3;
}
/*** Generate segments ***/
var j;
index = 3;
var cartographicsIndex = 0;
var vec2sWriteIndex = 0;
var vec3sWriteIndex = 0;
var vec4sWriteIndex = 0;
var miterBroken = false;
var endBottom = Cartographic.Cartesian3.unpack(bottomPositionsArray, 0, segmentEndBottomScratch);
var endTop = Cartographic.Cartesian3.unpack(topPositionsArray, 0, segmentEndTopScratch);
var endGeometryNormal = Cartographic.Cartesian3.unpack(normalsArray, 0, segmentEndNormalScratch);
if (loop) {
var preEndBottom = Cartographic.Cartesian3.unpack(bottomPositionsArray, bottomPositionsArray.length - 6, segmentStartBottomScratch);
if (breakMiter(endGeometryNormal, preEndBottom, endBottom, endTop)) {
// Miter broken as if for the last point in the loop, needs to be inverted for first point (clone of endBottom)
endGeometryNormal = Cartographic.Cartesian3.negate(endGeometryNormal, endGeometryNormal);
}
}
var lengthSoFar3D = 0.0;
var lengthSoFar2D = 0.0;
// For translating bounding volume
var sumHeights = 0.0;
for (i = 0; i < segmentCount; i++) {
var startBottom = Cartographic.Cartesian3.clone(endBottom, segmentStartBottomScratch);
var startTop = Cartographic.Cartesian3.clone(endTop, segmentStartTopScratch);
var startGeometryNormal = Cartographic.Cartesian3.clone(endGeometryNormal, segmentStartNormalScratch);
if (miterBroken) {
startGeometryNormal = Cartographic.Cartesian3.negate(startGeometryNormal, startGeometryNormal);
}
endBottom = Cartographic.Cartesian3.unpack(bottomPositionsArray, index, segmentEndBottomScratch);
endTop = Cartographic.Cartesian3.unpack(topPositionsArray, index, segmentEndTopScratch);
endGeometryNormal = Cartographic.Cartesian3.unpack(normalsArray, index, segmentEndNormalScratch);
miterBroken = breakMiter(endGeometryNormal, startBottom, endBottom, endTop);
// 2D - don't clone anything from previous segment b/c possible IDL touch
startCartographic.latitude = cartographicsArray[cartographicsIndex];
startCartographic.longitude = cartographicsArray[cartographicsIndex + 1];
endCartographic.latitude = cartographicsArray[cartographicsIndex + 2];
endCartographic.longitude = cartographicsArray[cartographicsIndex + 3];
var start2D;
var end2D;
var startGeometryNormal2D;
var endGeometryNormal2D;
if (compute2dAttributes) {
var nudgeResult = nudgeCartographic(startCartographic, endCartographic);
start2D = projection.project(startCartographic, segmentStart2DScratch);
end2D = projection.project(endCartographic, segmentEnd2DScratch);
var direction2D = direction(end2D, start2D, forwardOffset2DScratch);
direction2D.y = Math.abs(direction2D.y);
startGeometryNormal2D = segmentStartNormal2DScratch;
endGeometryNormal2D = segmentEndNormal2DScratch;
if (nudgeResult === 0 || Cartographic.Cartesian3.dot(direction2D, Cartographic.Cartesian3.UNIT_Y) > MITER_BREAK_SMALL) {
// No nudge - project the original normal
// Or, if the line's angle relative to the IDL is very acute,
// in which case snapping will produce oddly shaped volumes.
startGeometryNormal2D = projectNormal(projection, startCartographic, startGeometryNormal, start2D, segmentStartNormal2DScratch);
endGeometryNormal2D = projectNormal(projection, endCartographic, endGeometryNormal, end2D, segmentEndNormal2DScratch);
} else if (nudgeResult === 1) {
// Start is close to IDL - snap start normal to align with IDL
endGeometryNormal2D = projectNormal(projection, endCartographic, endGeometryNormal, end2D, segmentEndNormal2DScratch);
startGeometryNormal2D.x = 0.0;
// If start longitude is negative and end longitude is less negative, relative right is unit -Y
// If start longitude is positive and end longitude is less positive, relative right is unit +Y
startGeometryNormal2D.y = _Math.CesiumMath.sign(startCartographic.longitude - Math.abs(endCartographic.longitude));
startGeometryNormal2D.z = 0.0;
} else {
// End is close to IDL - snap end normal to align with IDL
startGeometryNormal2D = projectNormal(projection, startCartographic, startGeometryNormal, start2D, segmentStartNormal2DScratch);
endGeometryNormal2D.x = 0.0;
// If end longitude is negative and start longitude is less negative, relative right is unit Y
// If end longitude is positive and start longitude is less positive, relative right is unit -Y
endGeometryNormal2D.y = _Math.CesiumMath.sign(startCartographic.longitude - endCartographic.longitude);
endGeometryNormal2D.z = 0.0;
}
}
/****************************************
* Geometry descriptors of a "line on terrain,"
* as opposed to the "shadow volume used to draw
* the line on terrain":
* - position of start + offset to end
* - start, end, and right-facing planes
* - encoded texture coordinate offsets
****************************************/
/** 3D **/
var segmentLength3D = Cartographic.Cartesian3.distance(startTop, endTop);
var encodedStart = EncodedCartesian3.EncodedCartesian3.fromCartesian(startBottom, encodeScratch);
var forwardOffset = Cartographic.Cartesian3.subtract(endBottom, startBottom, offsetScratch);
var forward = Cartographic.Cartesian3.normalize(forwardOffset, rightScratch);
var startUp = Cartographic.Cartesian3.subtract(startTop, startBottom, startUpScratch);
startUp = Cartographic.Cartesian3.normalize(startUp, startUp);
var rightNormal = Cartographic.Cartesian3.cross(forward, startUp, rightScratch);
rightNormal = Cartographic.Cartesian3.normalize(rightNormal, rightNormal);
var startPlaneNormal = Cartographic.Cartesian3.cross(startUp, startGeometryNormal, startPlaneNormalScratch);
startPlaneNormal = Cartographic.Cartesian3.normalize(startPlaneNormal, startPlaneNormal);
var endUp = Cartographic.Cartesian3.subtract(endTop, endBottom, endUpScratch);
endUp = Cartographic.Cartesian3.normalize(endUp, endUp);
var endPlaneNormal = Cartographic.Cartesian3.cross(endGeometryNormal, endUp, endPlaneNormalScratch);
endPlaneNormal = Cartographic.Cartesian3.normalize(endPlaneNormal, endPlaneNormal);
var texcoordNormalization3DX = segmentLength3D / length3D;
var texcoordNormalization3DY = lengthSoFar3D / length3D;
/** 2D **/
var segmentLength2D = 0.0;
var encodedStart2D;
var forwardOffset2D;
var right2D;
var texcoordNormalization2DX = 0.0;
var texcoordNormalization2DY = 0.0;
if (compute2dAttributes) {
segmentLength2D = Cartographic.Cartesian3.distance(start2D, end2D);
encodedStart2D = EncodedCartesian3.EncodedCartesian3.fromCartesian(start2D, encodeScratch2D);
forwardOffset2D = Cartographic.Cartesian3.subtract(end2D, start2D, forwardOffset2DScratch);
// Right direction is just forward direction rotated by -90 degrees around Z
// Similarly with plane normals
right2D = Cartographic.Cartesian3.normalize(forwardOffset2D, right2DScratch);
var swap = right2D.x;
right2D.x = right2D.y;
right2D.y = -swap;
texcoordNormalization2DX = segmentLength2D / length2D;
texcoordNormalization2DY = lengthSoFar2D / length2D;
}
/** Pack **/
for (j = 0; j < 8; j++) {
var vec4Index = vec4sWriteIndex + j * 4;
var vec2Index = vec2sWriteIndex + j * 2;
var wIndex = vec4Index + 3;
// Encode sidedness of vertex relative to right plane in texture coordinate normalization X,
// whether vertex is top or bottom of volume in sign/magnitude of normalization Y.
var rightPlaneSide = j < 4 ? 1.0 : -1.0;
var topBottomSide = (j === 2 || j === 3 || j === 6 || j === 7) ? 1.0 : -1.0;
// 3D
Cartographic.Cartesian3.pack(encodedStart.high, startHiAndForwardOffsetX, vec4Index);
startHiAndForwardOffsetX[wIndex] = forwardOffset.x;
Cartographic.Cartesian3.pack(encodedStart.low, startLoAndForwardOffsetY, vec4Index);
startLoAndForwardOffsetY[wIndex] = forwardOffset.y;
Cartographic.Cartesian3.pack(startPlaneNormal, startNormalAndForwardOffsetZ, vec4Index);
startNormalAndForwardOffsetZ[wIndex] = forwardOffset.z;
Cartographic.Cartesian3.pack(endPlaneNormal, endNormalAndTextureCoordinateNormalizationX, vec4Index);
endNormalAndTextureCoordinateNormalizationX[wIndex] = texcoordNormalization3DX * rightPlaneSide;
Cartographic.Cartesian3.pack(rightNormal, rightNormalAndTextureCoordinateNormalizationY, vec4Index);
var texcoordNormalization = texcoordNormalization3DY * topBottomSide;
if (texcoordNormalization === 0.0 && topBottomSide < 0.0) {
texcoordNormalization = Number.POSITIVE_INFINITY;
}
rightNormalAndTextureCoordinateNormalizationY[wIndex] = texcoordNormalization;
// 2D
if (compute2dAttributes) {
startHiLo2D[vec4Index] = encodedStart2D.high.x;
startHiLo2D[vec4Index + 1] = encodedStart2D.high.y;
startHiLo2D[vec4Index + 2] = encodedStart2D.low.x;
startHiLo2D[vec4Index + 3] = encodedStart2D.low.y;
startEndNormals2D[vec4Index] = -startGeometryNormal2D.y;
startEndNormals2D[vec4Index + 1] = startGeometryNormal2D.x;
startEndNormals2D[vec4Index + 2] = endGeometryNormal2D.y;
startEndNormals2D[vec4Index + 3] = -endGeometryNormal2D.x;
offsetAndRight2D[vec4Index] = forwardOffset2D.x;
offsetAndRight2D[vec4Index + 1] = forwardOffset2D.y;
offsetAndRight2D[vec4Index + 2] = right2D.x;
offsetAndRight2D[vec4Index + 3] = right2D.y;
texcoordNormalization2D[vec2Index] = texcoordNormalization2DX * rightPlaneSide;
texcoordNormalization = texcoordNormalization2DY * topBottomSide;
if (texcoordNormalization === 0.0 && topBottomSide < 0.0) {
texcoordNormalization = Number.POSITIVE_INFINITY;
}
texcoordNormalization2D[vec2Index + 1] = texcoordNormalization;
}
}
// Adjust height of volume in 3D
var adjustHeightStartBottom = adjustHeightStartBottomScratch;
var adjustHeightEndBottom = adjustHeightEndBottomScratch;
var adjustHeightStartTop = adjustHeightStartTopScratch;
var adjustHeightEndTop = adjustHeightEndTopScratch;
var getHeightsRectangle = Cartesian2.Rectangle.fromCartographicArray(getHeightCartographics, getHeightRectangleScratch);
var minMaxHeights = ApproximateTerrainHeights.getMinimumMaximumHeights(getHeightsRectangle, ellipsoid);
var minHeight = minMaxHeights.minimumTerrainHeight;
var maxHeight = minMaxHeights.maximumTerrainHeight;
sumHeights += minHeight;
sumHeights += maxHeight;
adjustHeights(startBottom, startTop, minHeight, maxHeight, adjustHeightStartBottom, adjustHeightStartTop);
adjustHeights(endBottom, endTop, minHeight, maxHeight, adjustHeightEndBottom, adjustHeightEndTop);
// Nudge the positions away from the "polyline" a little bit to prevent errors in GeometryPipeline
var normalNudge = Cartographic.Cartesian3.multiplyByScalar(rightNormal, _Math.CesiumMath.EPSILON5, normalNudgeScratch);
Cartographic.Cartesian3.add(adjustHeightStartBottom, normalNudge, adjustHeightStartBottom);
Cartographic.Cartesian3.add(adjustHeightEndBottom, normalNudge, adjustHeightEndBottom);
Cartographic.Cartesian3.add(adjustHeightStartTop, normalNudge, adjustHeightStartTop);
Cartographic.Cartesian3.add(adjustHeightEndTop, normalNudge, adjustHeightEndTop);
// If the segment is very close to the XZ plane, nudge the vertices slightly to avoid touching it.
nudgeXZ(adjustHeightStartBottom, adjustHeightEndBottom);
nudgeXZ(adjustHeightStartTop, adjustHeightEndTop);
Cartographic.Cartesian3.pack(adjustHeightStartBottom, positionsArray, vec3sWriteIndex);
Cartographic.Cartesian3.pack(adjustHeightEndBottom, positionsArray, vec3sWriteIndex + 3);
Cartographic.Cartesian3.pack(adjustHeightEndTop, positionsArray, vec3sWriteIndex + 6);
Cartographic.Cartesian3.pack(adjustHeightStartTop, positionsArray, vec3sWriteIndex + 9);
normalNudge = Cartographic.Cartesian3.multiplyByScalar(rightNormal, -2.0 * _Math.CesiumMath.EPSILON5, normalNudgeScratch);
Cartographic.Cartesian3.add(adjustHeightStartBottom, normalNudge, adjustHeightStartBottom);
Cartographic.Cartesian3.add(adjustHeightEndBottom, normalNudge, adjustHeightEndBottom);
Cartographic.Cartesian3.add(adjustHeightStartTop, normalNudge, adjustHeightStartTop);
Cartographic.Cartesian3.add(adjustHeightEndTop, normalNudge, adjustHeightEndTop);
nudgeXZ(adjustHeightStartBottom, adjustHeightEndBottom);
nudgeXZ(adjustHeightStartTop, adjustHeightEndTop);
Cartographic.Cartesian3.pack(adjustHeightStartBottom, positionsArray, vec3sWriteIndex + 12);
Cartographic.Cartesian3.pack(adjustHeightEndBottom, positionsArray, vec3sWriteIndex + 15);
Cartographic.Cartesian3.pack(adjustHeightEndTop, positionsArray, vec3sWriteIndex + 18);
Cartographic.Cartesian3.pack(adjustHeightStartTop, positionsArray, vec3sWriteIndex + 21);
cartographicsIndex += 2;
index += 3;
vec2sWriteIndex += 16;
vec3sWriteIndex += 24;
vec4sWriteIndex += 32;
lengthSoFar3D += segmentLength3D;
lengthSoFar2D += segmentLength2D;
}
index = 0;
var indexOffset = 0;
for (i = 0; i < segmentCount; i++) {
for (j = 0; j < REFERENCE_INDICES_LENGTH; j++) {
indices[index + j] = REFERENCE_INDICES[j] + indexOffset;
}
indexOffset += 8;
index += REFERENCE_INDICES_LENGTH;
}
var boundingSpheres = scratchBoundingSpheres;
BoundingSphere.BoundingSphere.fromVertices(bottomPositionsArray, Cartographic.Cartesian3.ZERO, 3, boundingSpheres[0]);
BoundingSphere.BoundingSphere.fromVertices(topPositionsArray, Cartographic.Cartesian3.ZERO, 3, boundingSpheres[1]);
var boundingSphere = BoundingSphere.BoundingSphere.fromBoundingSpheres(boundingSpheres);
// Adjust bounding sphere height and radius to cover more of the volume
boundingSphere.radius += sumHeights / (segmentCount * 2.0);
var attributes = {
position : new GeometryAttribute.GeometryAttribute({
componentDatatype : ComponentDatatype.ComponentDatatype.DOUBLE,
componentsPerAttribute : 3,
normalize : false,
values : positionsArray
}),
startHiAndForwardOffsetX : getVec4GeometryAttribute(startHiAndForwardOffsetX),
startLoAndForwardOffsetY : getVec4GeometryAttribute(startLoAndForwardOffsetY),
startNormalAndForwardOffsetZ : getVec4GeometryAttribute(startNormalAndForwardOffsetZ),
endNormalAndTextureCoordinateNormalizationX : getVec4GeometryAttribute(endNormalAndTextureCoordinateNormalizationX),
rightNormalAndTextureCoordinateNormalizationY : getVec4GeometryAttribute(rightNormalAndTextureCoordinateNormalizationY)
};
if (compute2dAttributes) {
attributes.startHiLo2D = getVec4GeometryAttribute(startHiLo2D);
attributes.offsetAndRight2D = getVec4GeometryAttribute(offsetAndRight2D);
attributes.startEndNormals2D = getVec4GeometryAttribute(startEndNormals2D);
attributes.texcoordNormalization2D = new GeometryAttribute.GeometryAttribute({
componentDatatype : ComponentDatatype.ComponentDatatype.FLOAT,
componentsPerAttribute : 2,
normalize : false,
values : texcoordNormalization2D
});
}
return new GeometryAttribute.Geometry({
attributes : attributes,
indices : indices,
boundingSphere : boundingSphere
});
}
function getVec4GeometryAttribute(typedArray) {
return new GeometryAttribute.GeometryAttribute({
componentDatatype : ComponentDatatype.ComponentDatatype.FLOAT,
componentsPerAttribute : 4,
normalize : false,
values : typedArray
});
}
/**
* Approximates an ellipsoid-tangent vector in 2D by projecting the end point into 2D.
* Exposed for testing.
*
* @param {MapProjection} projection Map Projection for projecting coordinates to 2D.
* @param {Cartographic} cartographic The cartographic origin point of the normal.
* Used to check if the normal crosses the IDL during projection.
* @param {Cartesian3} normal The normal in 3D.
* @param {Cartesian3} projectedPosition The projected origin point of the normal in 2D.
* @param {Cartesian3} result Result parameter on which to store the projected normal.
* @private
*/
GroundPolylineGeometry._projectNormal = projectNormal;
function createGroundPolylineGeometry(groundPolylineGeometry, offset) {
return ApproximateTerrainHeights.initialize()
.then(function() {
if (when.defined(offset)) {
groundPolylineGeometry = GroundPolylineGeometry.unpack(groundPolylineGeometry, offset);
}
return GroundPolylineGeometry.createGeometry(groundPolylineGeometry);
});
}
return createGroundPolylineGeometry;
});