/
CoplanarPolygonGeometry.js
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/
CoplanarPolygonGeometry.js
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import arrayRemoveDuplicates from './arrayRemoveDuplicates.js';
import BoundingRectangle from './BoundingRectangle.js';
import BoundingSphere from './BoundingSphere.js';
import Cartesian2 from './Cartesian2.js';
import Cartesian3 from './Cartesian3.js';
import Check from './Check.js';
import ComponentDatatype from './ComponentDatatype.js';
import CoplanarPolygonGeometryLibrary from './CoplanarPolygonGeometryLibrary.js';
import defaultValue from './defaultValue.js';
import defined from './defined.js';
import Ellipsoid from './Ellipsoid.js';
import Geometry from './Geometry.js';
import GeometryAttribute from './GeometryAttribute.js';
import GeometryAttributes from './GeometryAttributes.js';
import GeometryInstance from './GeometryInstance.js';
import GeometryPipeline from './GeometryPipeline.js';
import IndexDatatype from './IndexDatatype.js';
import CesiumMath from './Math.js';
import Matrix3 from './Matrix3.js';
import PolygonGeometryLibrary from './PolygonGeometryLibrary.js';
import PolygonPipeline from './PolygonPipeline.js';
import PrimitiveType from './PrimitiveType.js';
import Quaternion from './Quaternion.js';
import VertexFormat from './VertexFormat.js';
var scratchPosition = new Cartesian3();
var scratchBR = new BoundingRectangle();
var stScratch = new Cartesian2();
var textureCoordinatesOrigin = new Cartesian2();
var scratchNormal = new Cartesian3();
var scratchTangent = new Cartesian3();
var scratchBitangent = new Cartesian3();
var centerScratch = new Cartesian3();
var axis1Scratch = new Cartesian3();
var axis2Scratch = new Cartesian3();
var quaternionScratch = new Quaternion();
var textureMatrixScratch = new Matrix3();
var tangentRotationScratch = new Matrix3();
var surfaceNormalScratch = new Cartesian3();
function createGeometryFromPolygon(polygon, vertexFormat, boundingRectangle, stRotation, projectPointTo2D, normal, tangent, bitangent) {
var positions = polygon.positions;
var indices = PolygonPipeline.triangulate(polygon.positions2D, polygon.holes);
/* If polygon is completely unrenderable, just use the first three vertices */
if (indices.length < 3) {
indices = [0, 1, 2];
}
var newIndices = IndexDatatype.createTypedArray(positions.length, indices.length);
newIndices.set(indices);
var textureMatrix = textureMatrixScratch;
if (stRotation !== 0.0) {
var rotation = Quaternion.fromAxisAngle(normal, stRotation, quaternionScratch);
textureMatrix = Matrix3.fromQuaternion(rotation, textureMatrix);
if (vertexFormat.tangent || vertexFormat.bitangent) {
rotation = Quaternion.fromAxisAngle(normal, -stRotation, quaternionScratch);
var tangentRotation = Matrix3.fromQuaternion(rotation, tangentRotationScratch);
tangent = Cartesian3.normalize(Matrix3.multiplyByVector(tangentRotation, tangent, tangent), tangent);
if (vertexFormat.bitangent) {
bitangent = Cartesian3.normalize(Cartesian3.cross(normal, tangent, bitangent), bitangent);
}
}
} else {
textureMatrix = Matrix3.clone(Matrix3.IDENTITY, textureMatrix);
}
var stOrigin = textureCoordinatesOrigin;
if (vertexFormat.st) {
stOrigin.x = boundingRectangle.x;
stOrigin.y = boundingRectangle.y;
}
var length = positions.length;
var size = length * 3;
var flatPositions = new Float64Array(size);
var normals = vertexFormat.normal ? new Float32Array(size) : undefined;
var tangents = vertexFormat.tangent ? new Float32Array(size) : undefined;
var bitangents = vertexFormat.bitangent ? new Float32Array(size) : undefined;
var textureCoordinates = vertexFormat.st ? new Float32Array(length * 2) : undefined;
var positionIndex = 0;
var normalIndex = 0;
var bitangentIndex = 0;
var tangentIndex = 0;
var stIndex = 0;
for (var i = 0; i < length; i++) {
var position = positions[i];
flatPositions[positionIndex++] = position.x;
flatPositions[positionIndex++] = position.y;
flatPositions[positionIndex++] = position.z;
if (vertexFormat.st) {
var p = Matrix3.multiplyByVector(textureMatrix, position, scratchPosition);
var st = projectPointTo2D(p, stScratch);
Cartesian2.subtract(st, stOrigin, st);
var stx = CesiumMath.clamp(st.x / boundingRectangle.width, 0, 1);
var sty = CesiumMath.clamp(st.y / boundingRectangle.height, 0, 1);
textureCoordinates[stIndex++] = stx;
textureCoordinates[stIndex++] = sty;
}
if (vertexFormat.normal) {
normals[normalIndex++] = normal.x;
normals[normalIndex++] = normal.y;
normals[normalIndex++] = normal.z;
}
if (vertexFormat.tangent) {
tangents[tangentIndex++] = tangent.x;
tangents[tangentIndex++] = tangent.y;
tangents[tangentIndex++] = tangent.z;
}
if (vertexFormat.bitangent) {
bitangents[bitangentIndex++] = bitangent.x;
bitangents[bitangentIndex++] = bitangent.y;
bitangents[bitangentIndex++] = bitangent.z;
}
}
var attributes = new GeometryAttributes();
if (vertexFormat.position) {
attributes.position = new GeometryAttribute({
componentDatatype : ComponentDatatype.DOUBLE,
componentsPerAttribute : 3,
values : flatPositions
});
}
if (vertexFormat.normal) {
attributes.normal = new GeometryAttribute({
componentDatatype : ComponentDatatype.FLOAT,
componentsPerAttribute : 3,
values : normals
});
}
if (vertexFormat.tangent) {
attributes.tangent = new GeometryAttribute({
componentDatatype : ComponentDatatype.FLOAT,
componentsPerAttribute : 3,
values : tangents
});
}
if (vertexFormat.bitangent) {
attributes.bitangent = new GeometryAttribute({
componentDatatype : ComponentDatatype.FLOAT,
componentsPerAttribute : 3,
values : bitangents
});
}
if (vertexFormat.st) {
attributes.st = new GeometryAttribute({
componentDatatype : ComponentDatatype.FLOAT,
componentsPerAttribute : 2,
values : textureCoordinates
});
}
return new Geometry({
attributes : attributes,
indices : newIndices,
primitiveType : PrimitiveType.TRIANGLES
});
}
/**
* A description of a polygon composed of arbitrary coplanar positions.
*
* @alias CoplanarPolygonGeometry
* @constructor
*
* @param {Object} options Object with the following properties:
* @param {PolygonHierarchy} options.polygonHierarchy A polygon hierarchy that can include holes.
* @param {Number} [options.stRotation=0.0] The rotation of the texture coordinates, in radians. A positive rotation is counter-clockwise.
* @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid to be used as a reference.
*
* @example
* var polygon = new Cesium.CoplanarPolygonGeometry({
* positions : Cesium.Cartesian3.fromDegreesArrayHeights([
* -90.0, 30.0, 0.0,
* -90.0, 30.0, 1000.0,
* -80.0, 30.0, 1000.0,
* -80.0, 30.0, 0.0
* ])
* });
* var geometry = Cesium.CoplanarPolygonGeometry.createGeometry(polygon);
*
* @see CoplanarPolygonGeometry.createGeometry
*/
function CoplanarPolygonGeometry(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
var polygonHierarchy = options.polygonHierarchy;
//>>includeStart('debug', pragmas.debug);
Check.defined('options.polygonHierarchy', polygonHierarchy);
//>>includeEnd('debug');
var vertexFormat = defaultValue(options.vertexFormat, VertexFormat.DEFAULT);
this._vertexFormat = VertexFormat.clone(vertexFormat);
this._polygonHierarchy = polygonHierarchy;
this._stRotation = defaultValue(options.stRotation, 0.0);
this._ellipsoid = Ellipsoid.clone(defaultValue(options.ellipsoid, Ellipsoid.WGS84));
this._workerName = 'createCoplanarPolygonGeometry';
/**
* The number of elements used to pack the object into an array.
* @type {Number}
*/
this.packedLength = PolygonGeometryLibrary.computeHierarchyPackedLength(polygonHierarchy) + VertexFormat.packedLength + Ellipsoid.packedLength + 2;
}
/**
* A description of a coplanar polygon from an array of positions.
*
* @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 {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.
* @returns {CoplanarPolygonGeometry}
*
* @example
* // create a polygon from points
* var polygon = Cesium.CoplanarPolygonGeometry.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
*/
CoplanarPolygonGeometry.fromPositions = function(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
//>>includeStart('debug', pragmas.debug);
Check.defined('options.positions', options.positions);
//>>includeEnd('debug');
var newOptions = {
polygonHierarchy : {
positions : options.positions
},
vertexFormat : options.vertexFormat,
stRotation : options.stRotation,
ellipsoid : options.ellipsoid
};
return new CoplanarPolygonGeometry(newOptions);
};
/**
* Stores the provided instance into the provided array.
*
* @param {CoplanarPolygonGeometry} 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
*/
CoplanarPolygonGeometry.pack = function(value, array, startingIndex) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object('value', value);
Check.defined('array', array);
//>>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._stRotation;
array[startingIndex] = value.packedLength;
return array;
};
var scratchEllipsoid = Ellipsoid.clone(Ellipsoid.UNIT_SPHERE);
var scratchVertexFormat = new VertexFormat();
var scratchOptions = {
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 {CoplanarPolygonGeometry} [result] The object into which to store the result.
* @returns {CoplanarPolygonGeometry} The modified result parameter or a new CoplanarPolygonGeometry instance if one was not provided.
*/
CoplanarPolygonGeometry.unpack = function(array, startingIndex, result) {
//>>includeStart('debug', pragmas.debug);
Check.defined('array', array);
//>>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 stRotation = array[startingIndex++];
var packedLength = array[startingIndex];
if (!defined(result)) {
result = new CoplanarPolygonGeometry(scratchOptions);
}
result._polygonHierarchy = polygonHierarchy;
result._ellipsoid = Ellipsoid.clone(ellipsoid, result._ellipsoid);
result._vertexFormat = VertexFormat.clone(vertexFormat, result._vertexFormat);
result._stRotation = stRotation;
result.packedLength = packedLength;
return result;
};
/**
* Computes the geometric representation of an arbitrary coplanar polygon, including its vertices, indices, and a bounding sphere.
*
* @param {CoplanarPolygonGeometry} polygonGeometry A description of the polygon.
* @returns {Geometry|undefined} The computed vertices and indices.
*/
CoplanarPolygonGeometry.createGeometry = function(polygonGeometry) {
var vertexFormat = polygonGeometry._vertexFormat;
var polygonHierarchy = polygonGeometry._polygonHierarchy;
var stRotation = polygonGeometry._stRotation;
var outerPositions = polygonHierarchy.positions;
outerPositions = arrayRemoveDuplicates(outerPositions, Cartesian3.equalsEpsilon, true);
if (outerPositions.length < 3) {
return;
}
var normal = scratchNormal;
var tangent = scratchTangent;
var bitangent = scratchBitangent;
var axis1 = axis1Scratch;
var axis2 = axis2Scratch;
var validGeometry = CoplanarPolygonGeometryLibrary.computeProjectTo2DArguments(outerPositions, centerScratch, axis1, axis2);
if (!validGeometry) {
return undefined;
}
normal = Cartesian3.cross(axis1, axis2, normal);
normal = Cartesian3.normalize(normal, normal);
if (!Cartesian3.equalsEpsilon(centerScratch, Cartesian3.ZERO, CesiumMath.EPSILON6)) {
var surfaceNormal = polygonGeometry._ellipsoid.geodeticSurfaceNormal(centerScratch, surfaceNormalScratch);
if (Cartesian3.dot(normal, surfaceNormal) < 0) {
normal = Cartesian3.negate(normal, normal);
axis1 = Cartesian3.negate(axis1, axis1);
}
}
var projectPoints = CoplanarPolygonGeometryLibrary.createProjectPointsTo2DFunction(centerScratch, axis1, axis2);
var projectPoint = CoplanarPolygonGeometryLibrary.createProjectPointTo2DFunction(centerScratch, axis1, axis2);
if (vertexFormat.tangent) {
tangent = Cartesian3.clone(axis1, tangent);
}
if (vertexFormat.bitangent) {
bitangent = Cartesian3.clone(axis2, bitangent);
}
var results = PolygonGeometryLibrary.polygonsFromHierarchy(polygonHierarchy, projectPoints, false);
var hierarchy = results.hierarchy;
var polygons = results.polygons;
if (hierarchy.length === 0) {
return;
}
outerPositions = hierarchy[0].outerRing;
var boundingSphere = BoundingSphere.fromPoints(outerPositions);
var boundingRectangle = PolygonGeometryLibrary.computeBoundingRectangle(normal, projectPoint, outerPositions, stRotation, scratchBR);
var geometries = [];
for (var i = 0; i < polygons.length; i++) {
var geometryInstance = new GeometryInstance({
geometry : createGeometryFromPolygon(polygons[i], vertexFormat, boundingRectangle, stRotation, projectPoint, normal, tangent, bitangent)
});
geometries.push(geometryInstance);
}
var 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;
if (!vertexFormat.position) {
delete attributes.position;
}
return new Geometry({
attributes : attributes,
indices : geometry.indices,
primitiveType : geometry.primitiveType,
boundingSphere : boundingSphere
});
};
export default CoplanarPolygonGeometry;