cesium
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Cesium is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin.
894 lines (788 loc) • 40 kB
JavaScript
/*global define*/
define([
'./BoundingRectangle',
'./BoundingSphere',
'./Cartesian2',
'./Cartesian3',
'./Cartographic',
'./ComponentDatatype',
'./defaultValue',
'./defined',
'./DeveloperError',
'./Ellipsoid',
'./EllipsoidTangentPlane',
'./Geometry',
'./GeometryAttribute',
'./GeometryAttributes',
'./GeometryInstance',
'./GeometryPipeline',
'./IndexDatatype',
'./Math',
'./Matrix3',
'./PolygonGeometryLibrary',
'./PolygonPipeline',
'./Quaternion',
'./VertexFormat',
'./WindingOrder'
], function(
BoundingRectangle,
BoundingSphere,
Cartesian2,
Cartesian3,
Cartographic,
ComponentDatatype,
defaultValue,
defined,
DeveloperError,
Ellipsoid,
EllipsoidTangentPlane,
Geometry,
GeometryAttribute,
GeometryAttributes,
GeometryInstance,
GeometryPipeline,
IndexDatatype,
CesiumMath,
Matrix3,
PolygonGeometryLibrary,
PolygonPipeline,
Quaternion,
VertexFormat,
WindingOrder) {
'use strict';
var computeBoundingRectangleCartesian2 = new Cartesian2();
var computeBoundingRectangleCartesian3 = new Cartesian3();
var computeBoundingRectangleQuaternion = new Quaternion();
var computeBoundingRectangleMatrix3 = new Matrix3();
function computeBoundingRectangle(tangentPlane, positions, angle, result) {
var rotation = Quaternion.fromAxisAngle(tangentPlane._plane.normal, angle, computeBoundingRectangleQuaternion);
var textureMatrix = Matrix3.fromQuaternion(rotation, computeBoundingRectangleMatrix3);
var minX = Number.POSITIVE_INFINITY;
var maxX = Number.NEGATIVE_INFINITY;
var minY = Number.POSITIVE_INFINITY;
var maxY = Number.NEGATIVE_INFINITY;
var length = positions.length;
for ( var i = 0; i < length; ++i) {
var p = Cartesian3.clone(positions[i], computeBoundingRectangleCartesian3);
Matrix3.multiplyByVector(textureMatrix, p, p);
var st = tangentPlane.projectPointOntoPlane(p, computeBoundingRectangleCartesian2);
if (defined(st)) {
minX = Math.min(minX, st.x);
maxX = Math.max(maxX, st.x);
minY = Math.min(minY, st.y);
maxY = Math.max(maxY, st.y);
}
}
result.x = minX;
result.y = minY;
result.width = maxX - minX;
result.height = maxY - minY;
return result;
}
var scratchCarto1 = new Cartographic();
var scratchCarto2 = new Cartographic();
function adjustPosHeightsForNormal(position, p1, p2, ellipsoid) {
var carto1 = ellipsoid.cartesianToCartographic(position, scratchCarto1);
var height = carto1.height;
var p1Carto = ellipsoid.cartesianToCartographic(p1, scratchCarto2);
p1Carto.height = height;
ellipsoid.cartographicToCartesian(p1Carto, p1);
var p2Carto = ellipsoid.cartesianToCartographic(p2, scratchCarto2);
p2Carto.height = height - 100;
ellipsoid.cartographicToCartesian(p2Carto, p2);
}
var scratchBoundingRectangle = new BoundingRectangle();
var scratchPosition = new Cartesian3();
var scratchNormal = new Cartesian3();
var scratchTangent = new Cartesian3();
var scratchBinormal = new Cartesian3();
var p1Scratch = new Cartesian3();
var p2Scratch = new Cartesian3();
var scratchPerPosNormal = new Cartesian3();
var scratchPerPosTangent = new Cartesian3();
var scratchPerPosBinormal = new Cartesian3();
var appendTextureCoordinatesOrigin = new Cartesian2();
var appendTextureCoordinatesCartesian2 = new Cartesian2();
var appendTextureCoordinatesCartesian3 = new Cartesian3();
var appendTextureCoordinatesQuaternion = new Quaternion();
var appendTextureCoordinatesMatrix3 = new Matrix3();
function computeAttributes(options) {
var vertexFormat = options.vertexFormat;
var geometry = options.geometry;
if (vertexFormat.st || vertexFormat.normal || vertexFormat.tangent || vertexFormat.binormal) {
// PERFORMANCE_IDEA: Compute before subdivision, then just interpolate during subdivision.
// PERFORMANCE_IDEA: Compute with createGeometryFromPositions() for fast path when there's no holes.
var boundingRectangle = options.boundingRectangle;
var tangentPlane = options.tangentPlane;
var ellipsoid = options.ellipsoid;
var stRotation = options.stRotation;
var wall = options.wall;
var top = options.top || wall;
var bottom = options.bottom || wall;
var perPositionHeight = options.perPositionHeight;
var origin = appendTextureCoordinatesOrigin;
origin.x = boundingRectangle.x;
origin.y = boundingRectangle.y;
var flatPositions = geometry.attributes.position.values;
var length = flatPositions.length;
var textureCoordinates = vertexFormat.st ? new Float32Array(2 * (length / 3)) : undefined;
var normals;
if (vertexFormat.normal) {
if (perPositionHeight && top && !wall) {
normals = geometry.attributes.normal.values;
} else {
normals = new Float32Array(length);
}
}
var tangents = vertexFormat.tangent ? new Float32Array(length) : undefined;
var binormals = vertexFormat.binormal ? new Float32Array(length) : undefined;
var textureCoordIndex = 0;
var attrIndex = 0;
var normal = scratchNormal;
var tangent = scratchTangent;
var binormal = scratchBinormal;
var recomputeNormal = true;
var rotation = Quaternion.fromAxisAngle(tangentPlane._plane.normal, stRotation, appendTextureCoordinatesQuaternion);
var textureMatrix = Matrix3.fromQuaternion(rotation, appendTextureCoordinatesMatrix3);
var bottomOffset = 0;
var bottomOffset2 = 0;
if (top && bottom) {
bottomOffset = length / 2;
bottomOffset2 = length / 3;
length /= 2;
}
for ( var i = 0; i < length; i += 3) {
var position = Cartesian3.fromArray(flatPositions, i, appendTextureCoordinatesCartesian3);
if (vertexFormat.st) {
var p = Matrix3.multiplyByVector(textureMatrix, position, scratchPosition);
p = ellipsoid.scaleToGeodeticSurface(p,p);
var st = tangentPlane.projectPointOntoPlane(p, appendTextureCoordinatesCartesian2);
Cartesian2.subtract(st, origin, st);
var stx = CesiumMath.clamp(st.x / boundingRectangle.width, 0, 1);
var sty = CesiumMath.clamp(st.y / boundingRectangle.height, 0, 1);
if (bottom) {
textureCoordinates[textureCoordIndex + bottomOffset2] = stx;
textureCoordinates[textureCoordIndex + 1 + bottomOffset2] = sty;
}
if (top) {
textureCoordinates[textureCoordIndex] = stx;
textureCoordinates[textureCoordIndex + 1] = sty;
}
textureCoordIndex += 2;
}
if (vertexFormat.normal || vertexFormat.tangent || vertexFormat.binormal) {
var attrIndex1 = attrIndex + 1;
var attrIndex2 = attrIndex + 2;
if (wall) {
if (i + 3 < length) {
var p1 = Cartesian3.fromArray(flatPositions, i + 3, p1Scratch);
if (recomputeNormal) {
var p2 = Cartesian3.fromArray(flatPositions, i + length, p2Scratch);
if (perPositionHeight) {
adjustPosHeightsForNormal(position, p1, p2, ellipsoid);
}
Cartesian3.subtract(p1, position, p1);
Cartesian3.subtract(p2, position, p2);
normal = Cartesian3.normalize(Cartesian3.cross(p2, p1, normal), normal);
recomputeNormal = false;
}
if (Cartesian3.equalsEpsilon(p1, position, CesiumMath.EPSILON10)) { // if we've reached a corner
recomputeNormal = true;
}
}
if (vertexFormat.tangent || vertexFormat.binormal) {
binormal = ellipsoid.geodeticSurfaceNormal(position, binormal);
if (vertexFormat.tangent) {
tangent = Cartesian3.normalize(Cartesian3.cross(binormal, normal, tangent), tangent);
}
}
} else {
normal = ellipsoid.geodeticSurfaceNormal(position, normal);
if (vertexFormat.tangent || vertexFormat.binormal) {
if (perPositionHeight) {
scratchPerPosNormal = Cartesian3.fromArray(normals, attrIndex, scratchPerPosNormal);
scratchPerPosTangent = Cartesian3.cross(Cartesian3.UNIT_Z, scratchPerPosNormal, scratchPerPosTangent);
scratchPerPosTangent = Cartesian3.normalize(Matrix3.multiplyByVector(textureMatrix, scratchPerPosTangent, scratchPerPosTangent), scratchPerPosTangent);
if (vertexFormat.binormal) {
scratchPerPosBinormal = Cartesian3.normalize(Cartesian3.cross(scratchPerPosNormal, scratchPerPosTangent, scratchPerPosBinormal), scratchPerPosBinormal);
}
}
tangent = Cartesian3.cross(Cartesian3.UNIT_Z, normal, tangent);
tangent = Cartesian3.normalize(Matrix3.multiplyByVector(textureMatrix, tangent, tangent), tangent);
if (vertexFormat.binormal) {
binormal = Cartesian3.normalize(Cartesian3.cross(normal, tangent, binormal), binormal);
}
}
}
if (vertexFormat.normal) {
if (options.wall) {
normals[attrIndex + bottomOffset] = normal.x;
normals[attrIndex1 + bottomOffset] = normal.y;
normals[attrIndex2 + bottomOffset] = normal.z;
} else if (bottom){
normals[attrIndex + bottomOffset] = -normal.x;
normals[attrIndex1 + bottomOffset] = -normal.y;
normals[attrIndex2 + bottomOffset] = -normal.z;
}
if ((top && !perPositionHeight) || wall) {
normals[attrIndex] = normal.x;
normals[attrIndex1] = normal.y;
normals[attrIndex2] = normal.z;
}
}
if (vertexFormat.tangent) {
if (options.wall) {
tangents[attrIndex + bottomOffset] = tangent.x;
tangents[attrIndex1 + bottomOffset] = tangent.y;
tangents[attrIndex2 + bottomOffset] = tangent.z;
} else if (bottom) {
tangents[attrIndex + bottomOffset] = -tangent.x;
tangents[attrIndex1 + bottomOffset] = -tangent.y;
tangents[attrIndex2 + bottomOffset] = -tangent.z;
}
if(top) {
if (perPositionHeight) {
tangents[attrIndex] = scratchPerPosTangent.x;
tangents[attrIndex1] = scratchPerPosTangent.y;
tangents[attrIndex2] = scratchPerPosTangent.z;
} else {
tangents[attrIndex] = tangent.x;
tangents[attrIndex1] = tangent.y;
tangents[attrIndex2] = tangent.z;
}
}
}
if (vertexFormat.binormal) {
if (bottom) {
binormals[attrIndex + bottomOffset] = binormal.x;
binormals[attrIndex1 + bottomOffset] = binormal.y;
binormals[attrIndex2 + bottomOffset] = binormal.z;
}
if (top) {
if (perPositionHeight) {
binormals[attrIndex] = scratchPerPosBinormal.x;
binormals[attrIndex1] = scratchPerPosBinormal.y;
binormals[attrIndex2] = scratchPerPosBinormal.z;
} else {
binormals[attrIndex] = binormal.x;
binormals[attrIndex1] = binormal.y;
binormals[attrIndex2] = binormal.z;
}
}
}
attrIndex += 3;
}
}
if (vertexFormat.st) {
geometry.attributes.st = new GeometryAttribute({
componentDatatype : ComponentDatatype.FLOAT,
componentsPerAttribute : 2,
values : textureCoordinates
});
}
if (vertexFormat.normal) {
geometry.attributes.normal = new GeometryAttribute({
componentDatatype : ComponentDatatype.FLOAT,
componentsPerAttribute : 3,
values : normals
});
}
if (vertexFormat.tangent) {
geometry.attributes.tangent = new GeometryAttribute({
componentDatatype : ComponentDatatype.FLOAT,
componentsPerAttribute : 3,
values : tangents
});
}
if (vertexFormat.binormal) {
geometry.attributes.binormal = new GeometryAttribute({
componentDatatype : ComponentDatatype.FLOAT,
componentsPerAttribute : 3,
values : binormals
});
}
}
return geometry;
}
var createGeometryFromPositionsExtrudedPositions = [];
function createGeometryFromPositionsExtruded(ellipsoid, positions, granularity, hierarchy, perPositionHeight, closeTop, closeBottom, vertexFormat) {
var geos = {
walls : []
};
var i;
if (closeTop || closeBottom) {
var topGeo = PolygonGeometryLibrary.createGeometryFromPositions(ellipsoid, positions, granularity, perPositionHeight, vertexFormat);
var edgePoints = topGeo.attributes.position.values;
var indices = topGeo.indices;
var numPositions;
var newIndices;
if (closeTop && closeBottom) {
var topBottomPositions = edgePoints.concat(edgePoints);
numPositions = topBottomPositions.length / 3;
newIndices = IndexDatatype.createTypedArray(numPositions, indices.length * 2);
newIndices.set(indices);
var ilength = indices.length;
var length = numPositions / 2;
for (i = 0; i < ilength; i += 3) {
var i0 = newIndices[i] + length;
var i1 = newIndices[i + 1] + length;
var i2 = newIndices[i + 2] + length;
newIndices[i + ilength] = i2;
newIndices[i + 1 + ilength] = i1;
newIndices[i + 2 + ilength] = i0;
}
topGeo.attributes.position.values = topBottomPositions;
if (perPositionHeight) {
var normals = topGeo.attributes.normal.values;
topGeo.attributes.normal.values = new Float32Array(topBottomPositions.length);
topGeo.attributes.normal.values.set(normals);
}
topGeo.indices = newIndices;
} else if (closeBottom) {
numPositions = edgePoints.length / 3;
newIndices = IndexDatatype.createTypedArray(numPositions, indices.length);
for (i = 0; i < indices.length; i += 3) {
newIndices[i] = indices[i + 2];
newIndices[i + 1] = indices[i + 1];
newIndices[i + 2] = indices[i];
}
topGeo.indices = newIndices;
}
geos.topAndBottom = new GeometryInstance({
geometry : topGeo
});
}
var outerRing = hierarchy.outerRing;
var tangentPlane = EllipsoidTangentPlane.fromPoints(outerRing, ellipsoid);
var positions2D = tangentPlane.projectPointsOntoPlane(outerRing, createGeometryFromPositionsExtrudedPositions);
var windingOrder = PolygonPipeline.computeWindingOrder2D(positions2D);
if (windingOrder === WindingOrder.CLOCKWISE) {
outerRing = outerRing.slice().reverse();
}
var wallGeo = PolygonGeometryLibrary.computeWallGeometry(outerRing, ellipsoid, granularity, perPositionHeight);
geos.walls.push(new GeometryInstance({
geometry : wallGeo
}));
var holes = hierarchy.holes;
for (i = 0; i < holes.length; i++) {
var hole = holes[i];
tangentPlane = EllipsoidTangentPlane.fromPoints(hole, ellipsoid);
positions2D = tangentPlane.projectPointsOntoPlane(hole, createGeometryFromPositionsExtrudedPositions);
windingOrder = PolygonPipeline.computeWindingOrder2D(positions2D);
if (windingOrder === WindingOrder.COUNTER_CLOCKWISE) {
hole = hole.slice().reverse();
}
wallGeo = PolygonGeometryLibrary.computeWallGeometry(hole, ellipsoid, granularity);
geos.walls.push(new GeometryInstance({
geometry : wallGeo
}));
}
return geos;
}
/**
* A description of a polygon on the ellipsoid. The polygon is defined by a polygon hierarchy. Polygon geometry can be rendered with both {@link Primitive} and {@link GroundPrimitive}.
*
* @alias PolygonGeometry
* @constructor
*
* @param {Object} options Object with the following properties:
* @param {PolygonHierarchy} options.polygonHierarchy A polygon hierarchy that can include holes.
* @param {Number} [options.height=0.0] The distance in meters between the polygon and the ellipsoid surface.
* @param {Number} [options.extrudedHeight] The distance in meters between the polygon's extruded face and the ellipsoid surface.
* @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
* @param {Number} [options.stRotation=0.0] The rotation of the texture coordinates, in radians. A positive rotation is counter-clockwise.
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid to be used as a reference.
* @param {Number} [options.granularity=CesiumMath.RADIANS_PER_DEGREE] The distance, in radians, between each latitude and longitude. Determines the number of positions in the buffer.
* @param {Boolean} [options.perPositionHeight=false] Use the height of options.positions for each position instead of using options.height to determine the height.
* @param {Boolean} [options.closeTop=true] When false, leaves off the top of an extruded polygon open.
* @param {Boolean} [options.closeBottom=true] When false, leaves off the bottom of an extruded polygon open.
*
* @see PolygonGeometry#createGeometry
* @see PolygonGeometry#fromPositions
*
* @demo {@link http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Polygon.html|Cesium Sandcastle Polygon Demo}
*
* @example
* // 1. create a polygon from points
* var polygon = new Cesium.PolygonGeometry({
* polygonHierarchy : new Cesium.PolygonHierarchy(
* Cesium.Cartesian3.fromDegreesArray([
* -72.0, 40.0,
* -70.0, 35.0,
* -75.0, 30.0,
* -70.0, 30.0,
* -68.0, 40.0
* ])
* )
* });
* var geometry = Cesium.PolygonGeometry.createGeometry(polygon);
*
* // 2. create a nested polygon with holes
* var polygonWithHole = new Cesium.PolygonGeometry({
* polygonHierarchy : new Cesium.PolygonHierarchy(
* Cesium.Cartesian3.fromDegreesArray([
* -109.0, 30.0,
* -95.0, 30.0,
* -95.0, 40.0,
* -109.0, 40.0
* ]),
* [new Cesium.PolygonHierarchy(
* Cesium.Cartesian3.fromDegreesArray([
* -107.0, 31.0,
* -107.0, 39.0,
* -97.0, 39.0,
* -97.0, 31.0
* ]),
* [new Cesium.PolygonHierarchy(
* Cesium.Cartesian3.fromDegreesArray([
* -105.0, 33.0,
* -99.0, 33.0,
* -99.0, 37.0,
* -105.0, 37.0
* ]),
* [new Cesium.PolygonHierarchy(
* Cesium.Cartesian3.fromDegreesArray([
* -103.0, 34.0,
* -101.0, 34.0,
* -101.0, 36.0,
* -103.0, 36.0
* ])
* )]
* )]
* )]
* )
* });
* var geometry = Cesium.PolygonGeometry.createGeometry(polygonWithHole);
*
* // 3. create extruded polygon
* var extrudedPolygon = new Cesium.PolygonGeometry({
* polygonHierarchy : new Cesium.PolygonHierarchy(
* Cesium.Cartesian3.fromDegreesArray([
* -72.0, 40.0,
* -70.0, 35.0,
* -75.0, 30.0,
* -70.0, 30.0,
* -68.0, 40.0
* ])
* ),
* extrudedHeight: 300000
* });
* var geometry = Cesium.PolygonGeometry.createGeometry(extrudedPolygon);
*/
function PolygonGeometry(options) {
//>>includeStart('debug', pragmas.debug);
if (!defined(options) || !defined(options.polygonHierarchy)) {
throw new DeveloperError('options.polygonHierarchy is required.');
}
if (defined(options.perPositionHeight) && options.perPositionHeight && defined(options.height)) {
throw new DeveloperError('Cannot use both options.perPositionHeight and options.height');
}
//>>includeEnd('debug');
var polygonHierarchy = options.polygonHierarchy;
var vertexFormat = defaultValue(options.vertexFormat, VertexFormat.DEFAULT);
var ellipsoid = defaultValue(options.ellipsoid, Ellipsoid.WGS84);
var granularity = defaultValue(options.granularity, CesiumMath.RADIANS_PER_DEGREE);
var stRotation = defaultValue(options.stRotation, 0.0);
var height = defaultValue(options.height, 0.0);
var perPositionHeight = defaultValue(options.perPositionHeight, false);
var extrudedHeight = options.extrudedHeight;
var extrude = defined(extrudedHeight);
if (!perPositionHeight && extrude) {
//Ignore extrudedHeight if it matches height
if (CesiumMath.equalsEpsilon(height, extrudedHeight, CesiumMath.EPSILON10)) {
extrudedHeight = undefined;
extrude = false;
} else {
var h = extrudedHeight;
extrudedHeight = Math.min(h, height);
height = Math.max(h, height);
}
}
this._vertexFormat = VertexFormat.clone(vertexFormat);
this._ellipsoid = Ellipsoid.clone(ellipsoid);
this._granularity = granularity;
this._stRotation = stRotation;
this._height = height;
this._extrudedHeight = defaultValue(extrudedHeight, 0.0);
this._extrude = extrude;
this._closeTop = defaultValue(options.closeTop, true);
this._closeBottom = defaultValue(options.closeBottom, true);
this._polygonHierarchy = polygonHierarchy;
this._perPositionHeight = perPositionHeight;
this._workerName = 'createPolygonGeometry';
/**
* The number of elements used to pack the object into an array.
* @type {Number}
*/
this.packedLength = PolygonGeometryLibrary.computeHierarchyPackedLength(polygonHierarchy) + Ellipsoid.packedLength + VertexFormat.packedLength + 9;
}
/**
* A description of a polygon from an array of positions. Polygon geometry can be rendered with both {@link Primitive} and {@link GroundPrimitive}.
*
* @param {Object} options Object with the following properties:
* @param {Cartesian3[]} options.positions An array of positions that defined the corner points of the polygon.
* @param {Number} [options.height=0.0] The height of the polygon.
* @param {Number} [options.extrudedHeight] The height of the polygon extrusion.
* @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
* @param {Number} [options.stRotation=0.0] The rotation of the texture coordiantes, in radians. A positive rotation is counter-clockwise.
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid to be used as a reference.
* @param {Number} [options.granularity=CesiumMath.RADIANS_PER_DEGREE] The distance, in radians, between each latitude and longitude. Determines the number of positions in the buffer.
* @param {Boolean} [options.perPositionHeight=false] Use the height of options.positions for each position instead of using options.height to determine the height.
* @param {Boolean} [options.closeTop=true] When false, leaves off the top of an extruded polygon open.
* @param {Boolean} [options.closeBottom=true] When false, leaves off the bottom of an extruded polygon open.
* @returns {PolygonGeometry}
*
*
* @example
* // create a polygon from points
* var polygon = Cesium.PolygonGeometry.fromPositions({
* positions : Cesium.Cartesian3.fromDegreesArray([
* -72.0, 40.0,
* -70.0, 35.0,
* -75.0, 30.0,
* -70.0, 30.0,
* -68.0, 40.0
* ])
* });
* var geometry = Cesium.PolygonGeometry.createGeometry(polygon);
*
* @see PolygonGeometry#createGeometry
*/
PolygonGeometry.fromPositions = function(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
//>>includeStart('debug', pragmas.debug);
if (!defined(options.positions)) {
throw new DeveloperError('options.positions is required.');
}
//>>includeEnd('debug');
var newOptions = {
polygonHierarchy : {
positions : options.positions
},
height : options.height,
extrudedHeight : options.extrudedHeight,
vertexFormat : options.vertexFormat,
stRotation : options.stRotation,
ellipsoid : options.ellipsoid,
granularity : options.granularity,
perPositionHeight : options.perPositionHeight,
closeTop : options.closeTop,
closeBottom: options.closeBottom
};
return new PolygonGeometry(newOptions);
};
/**
* 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.
*/
PolygonGeometry.pack = function(value, array, startingIndex) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError('value is required');
}
if (!defined(array)) {
throw new DeveloperError('array is required');
}
//>>includeEnd('debug');
startingIndex = defaultValue(startingIndex, 0);
startingIndex = PolygonGeometryLibrary.packPolygonHierarchy(value._polygonHierarchy, array, startingIndex);
Ellipsoid.pack(value._ellipsoid, array, startingIndex);
startingIndex += Ellipsoid.packedLength;
VertexFormat.pack(value._vertexFormat, array, startingIndex);
startingIndex += VertexFormat.packedLength;
array[startingIndex++] = value._height;
array[startingIndex++] = value._extrudedHeight;
array[startingIndex++] = value._granularity;
array[startingIndex++] = value._stRotation;
array[startingIndex++] = value._extrude ? 1.0 : 0.0;
array[startingIndex++] = value._perPositionHeight ? 1.0 : 0.0;
array[startingIndex++] = value._closeTop ? 1.0 : 0.0;
array[startingIndex++] = value._closeBottom ? 1.0 : 0.0;
array[startingIndex] = value.packedLength;
};
var scratchEllipsoid = Ellipsoid.clone(Ellipsoid.UNIT_SPHERE);
var scratchVertexFormat = new VertexFormat();
//Only used to avoid inaability to default construct.
var dummyOptions = {
polygonHierarchy : {}
};
/**
* 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.
*/
PolygonGeometry.unpack = function(array, startingIndex, result) {
//>>includeStart('debug', pragmas.debug);
if (!defined(array)) {
throw new DeveloperError('array is required');
}
//>>includeEnd('debug');
startingIndex = defaultValue(startingIndex, 0);
var polygonHierarchy = PolygonGeometryLibrary.unpackPolygonHierarchy(array, startingIndex);
startingIndex = polygonHierarchy.startingIndex;
delete polygonHierarchy.startingIndex;
var ellipsoid = Ellipsoid.unpack(array, startingIndex, scratchEllipsoid);
startingIndex += Ellipsoid.packedLength;
var vertexFormat = VertexFormat.unpack(array, startingIndex, scratchVertexFormat);
startingIndex += VertexFormat.packedLength;
var height = array[startingIndex++];
var extrudedHeight = array[startingIndex++];
var granularity = array[startingIndex++];
var stRotation = array[startingIndex++];
var extrude = array[startingIndex++] === 1.0;
var perPositionHeight = array[startingIndex++] === 1.0;
var closeTop = array[startingIndex++] === 1.0;
var closeBottom = array[startingIndex++] === 1.0;
var packedLength = array[startingIndex];
if (!defined(result)) {
result = new PolygonGeometry(dummyOptions);
}
result._polygonHierarchy = polygonHierarchy;
result._ellipsoid = Ellipsoid.clone(ellipsoid, result._ellipsoid);
result._vertexFormat = VertexFormat.clone(vertexFormat, result._vertexFormat);
result._height = height;
result._extrudedHeight = extrudedHeight;
result._granularity = granularity;
result._stRotation = stRotation;
result._extrude = extrude;
result._perPositionHeight = perPositionHeight;
result._closeTop = closeTop;
result._closeBottom = closeBottom;
result.packedLength = packedLength;
return result;
};
/**
* Computes the geometric representation of a polygon, including its vertices, indices, and a bounding sphere.
*
* @param {PolygonGeometry} polygonGeometry A description of the polygon.
* @returns {Geometry|undefined} The computed vertices and indices.
*/
PolygonGeometry.createGeometry = function(polygonGeometry) {
var vertexFormat = polygonGeometry._vertexFormat;
var ellipsoid = polygonGeometry._ellipsoid;
var granularity = polygonGeometry._granularity;
var stRotation = polygonGeometry._stRotation;
var height = polygonGeometry._height;
var extrudedHeight = polygonGeometry._extrudedHeight;
var extrude = polygonGeometry._extrude;
var polygonHierarchy = polygonGeometry._polygonHierarchy;
var perPositionHeight = polygonGeometry._perPositionHeight;
var closeTop = polygonGeometry._closeTop;
var closeBottom = polygonGeometry._closeBottom;
var walls;
var topAndBottom;
var outerPositions;
var results = PolygonGeometryLibrary.polygonsFromHierarchy(polygonHierarchy, perPositionHeight, ellipsoid);
var hierarchy = results.hierarchy;
var polygons = results.polygons;
var i;
if (polygons.length === 0) {
return;
}
if (perPositionHeight) {
outerPositions = polygons[0].slice();
for (i = 0; i < outerPositions.length; i++) {
outerPositions[i] = ellipsoid.scaleToGeodeticSurface(outerPositions[i]);
}
} else {
outerPositions = polygons[0];
}
var tangentPlane = EllipsoidTangentPlane.fromPoints(outerPositions, ellipsoid);
var boundingRectangle = computeBoundingRectangle(tangentPlane, outerPositions, stRotation, scratchBoundingRectangle);
var geometry;
var geometries = [];
var options = {
perPositionHeight: perPositionHeight,
vertexFormat: vertexFormat,
geometry: undefined,
tangentPlane: tangentPlane,
boundingRectangle: boundingRectangle,
ellipsoid: ellipsoid,
stRotation: stRotation,
bottom: false,
top: true,
wall: false
};
if (extrude) {
options.top = closeTop;
options.bottom = closeBottom;
for (i = 0; i < polygons.length; i++) {
geometry = createGeometryFromPositionsExtruded(ellipsoid, polygons[i], granularity, hierarchy[i], perPositionHeight, closeTop, closeBottom, vertexFormat);
if (closeTop && closeBottom) {
topAndBottom = geometry.topAndBottom;
options.geometry = PolygonGeometryLibrary.scaleToGeodeticHeightExtruded(topAndBottom.geometry, height, extrudedHeight, ellipsoid, perPositionHeight);
} else if (closeTop) {
topAndBottom = geometry.topAndBottom;
topAndBottom.geometry.attributes.position.values = PolygonPipeline.scaleToGeodeticHeight(topAndBottom.geometry.attributes.position.values, height, ellipsoid, !perPositionHeight);
options.geometry = topAndBottom.geometry;
} else if (closeBottom) {
topAndBottom = geometry.topAndBottom;
topAndBottom.geometry.attributes.position.values = PolygonPipeline.scaleToGeodeticHeight(topAndBottom.geometry.attributes.position.values, extrudedHeight, ellipsoid, true);
options.geometry = topAndBottom.geometry;
}
if (closeTop || closeBottom) {
options.wall = false;
topAndBottom.geometry = computeAttributes(options);
geometries.push(topAndBottom);
}
walls = geometry.walls;
options.wall = true;
for ( var k = 0; k < walls.length; k++) {
var wall = walls[k];
options.geometry = PolygonGeometryLibrary.scaleToGeodeticHeightExtruded(wall.geometry, height, extrudedHeight, ellipsoid, perPositionHeight);
wall.geometry = computeAttributes(options);
geometries.push(wall);
}
}
} else {
for (i = 0; i < polygons.length; i++) {
geometry = new GeometryInstance({
geometry : PolygonGeometryLibrary.createGeometryFromPositions(ellipsoid, polygons[i], granularity, perPositionHeight, vertexFormat)
});
geometry.geometry.attributes.position.values = PolygonPipeline.scaleToGeodeticHeight(geometry.geometry.attributes.position.values, height, ellipsoid, !perPositionHeight);
options.geometry = geometry.geometry;
geometry.geometry = computeAttributes(options);
geometries.push(geometry);
}
}
geometry = GeometryPipeline.combineInstances(geometries)[0];
geometry.attributes.position.values = new Float64Array(geometry.attributes.position.values);
geometry.indices = IndexDatatype.createTypedArray(geometry.attributes.position.values.length / 3, geometry.indices);
var attributes = geometry.attributes;
var boundingSphere = BoundingSphere.fromVertices(attributes.position.values);
if (!vertexFormat.position) {
delete attributes.position;
}
return new Geometry({
attributes : attributes,
indices : geometry.indices,
primitiveType : geometry.primitiveType,
boundingSphere : boundingSphere
});
};
/**
* @private
*/
PolygonGeometry.createShadowVolume = function(polygonGeometry, minHeightFunc, maxHeightFunc) {
var granularity = polygonGeometry._granularity;
var ellipsoid = polygonGeometry._ellipsoid;
var minHeight = minHeightFunc(granularity, ellipsoid);
var maxHeight = maxHeightFunc(granularity, ellipsoid);
return new PolygonGeometry({
polygonHierarchy : polygonGeometry._polygonHierarchy,
ellipsoid : ellipsoid,
stRotation : polygonGeometry._stRotation,
granularity : granularity,
perPositionHeight : false,
extrudedHeight : minHeight,
height : maxHeight,
vertexFormat : VertexFormat.POSITION_ONLY
});
};
return PolygonGeometry;
});