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528 lines
16 KiB
JavaScript
528 lines
16 KiB
JavaScript
import arrayRemoveDuplicates from "./arrayRemoveDuplicates.js";
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import BoundingRectangle from "./BoundingRectangle.js";
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import BoundingSphere from "./BoundingSphere.js";
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import Cartesian2 from "./Cartesian2.js";
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import Cartesian3 from "./Cartesian3.js";
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import Check from "./Check.js";
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import ComponentDatatype from "./ComponentDatatype.js";
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import CoplanarPolygonGeometryLibrary from "./CoplanarPolygonGeometryLibrary.js";
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import defaultValue from "./defaultValue.js";
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import defined from "./defined.js";
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import Ellipsoid from "./Ellipsoid.js";
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import Geometry from "./Geometry.js";
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import GeometryAttribute from "./GeometryAttribute.js";
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import GeometryAttributes from "./GeometryAttributes.js";
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import GeometryInstance from "./GeometryInstance.js";
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import GeometryPipeline from "./GeometryPipeline.js";
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import IndexDatatype from "./IndexDatatype.js";
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import CesiumMath from "./Math.js";
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import Matrix3 from "./Matrix3.js";
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import PolygonGeometryLibrary from "./PolygonGeometryLibrary.js";
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import PolygonPipeline from "./PolygonPipeline.js";
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import PrimitiveType from "./PrimitiveType.js";
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import Quaternion from "./Quaternion.js";
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import VertexFormat from "./VertexFormat.js";
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var scratchPosition = new Cartesian3();
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var scratchBR = new BoundingRectangle();
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var stScratch = new Cartesian2();
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var textureCoordinatesOrigin = new Cartesian2();
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var scratchNormal = new Cartesian3();
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var scratchTangent = new Cartesian3();
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var scratchBitangent = new Cartesian3();
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var centerScratch = new Cartesian3();
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var axis1Scratch = new Cartesian3();
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var axis2Scratch = new Cartesian3();
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var quaternionScratch = new Quaternion();
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var textureMatrixScratch = new Matrix3();
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var tangentRotationScratch = new Matrix3();
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var surfaceNormalScratch = new Cartesian3();
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function createGeometryFromPolygon(
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polygon,
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vertexFormat,
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boundingRectangle,
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stRotation,
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projectPointTo2D,
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normal,
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tangent,
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bitangent
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) {
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var positions = polygon.positions;
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var indices = PolygonPipeline.triangulate(polygon.positions2D, polygon.holes);
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/* If polygon is completely unrenderable, just use the first three vertices */
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if (indices.length < 3) {
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indices = [0, 1, 2];
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}
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var newIndices = IndexDatatype.createTypedArray(
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positions.length,
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indices.length
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);
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newIndices.set(indices);
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var textureMatrix = textureMatrixScratch;
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if (stRotation !== 0.0) {
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var rotation = Quaternion.fromAxisAngle(
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normal,
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stRotation,
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quaternionScratch
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);
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textureMatrix = Matrix3.fromQuaternion(rotation, textureMatrix);
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if (vertexFormat.tangent || vertexFormat.bitangent) {
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rotation = Quaternion.fromAxisAngle(
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normal,
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-stRotation,
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quaternionScratch
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);
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var tangentRotation = Matrix3.fromQuaternion(
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rotation,
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tangentRotationScratch
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);
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tangent = Cartesian3.normalize(
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Matrix3.multiplyByVector(tangentRotation, tangent, tangent),
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tangent
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);
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if (vertexFormat.bitangent) {
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bitangent = Cartesian3.normalize(
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Cartesian3.cross(normal, tangent, bitangent),
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bitangent
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);
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}
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}
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} else {
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textureMatrix = Matrix3.clone(Matrix3.IDENTITY, textureMatrix);
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}
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var stOrigin = textureCoordinatesOrigin;
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if (vertexFormat.st) {
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stOrigin.x = boundingRectangle.x;
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stOrigin.y = boundingRectangle.y;
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}
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var length = positions.length;
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var size = length * 3;
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var flatPositions = new Float64Array(size);
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var normals = vertexFormat.normal ? new Float32Array(size) : undefined;
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var tangents = vertexFormat.tangent ? new Float32Array(size) : undefined;
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var bitangents = vertexFormat.bitangent ? new Float32Array(size) : undefined;
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var textureCoordinates = vertexFormat.st
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? new Float32Array(length * 2)
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: undefined;
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var positionIndex = 0;
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var normalIndex = 0;
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var bitangentIndex = 0;
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var tangentIndex = 0;
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var stIndex = 0;
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for (var i = 0; i < length; i++) {
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var position = positions[i];
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flatPositions[positionIndex++] = position.x;
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flatPositions[positionIndex++] = position.y;
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flatPositions[positionIndex++] = position.z;
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if (vertexFormat.st) {
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var p = Matrix3.multiplyByVector(
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textureMatrix,
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position,
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scratchPosition
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);
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var st = projectPointTo2D(p, stScratch);
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Cartesian2.subtract(st, stOrigin, st);
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var stx = CesiumMath.clamp(st.x / boundingRectangle.width, 0, 1);
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var sty = CesiumMath.clamp(st.y / boundingRectangle.height, 0, 1);
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textureCoordinates[stIndex++] = stx;
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textureCoordinates[stIndex++] = sty;
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}
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if (vertexFormat.normal) {
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normals[normalIndex++] = normal.x;
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normals[normalIndex++] = normal.y;
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normals[normalIndex++] = normal.z;
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}
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if (vertexFormat.tangent) {
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tangents[tangentIndex++] = tangent.x;
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tangents[tangentIndex++] = tangent.y;
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tangents[tangentIndex++] = tangent.z;
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}
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if (vertexFormat.bitangent) {
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bitangents[bitangentIndex++] = bitangent.x;
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bitangents[bitangentIndex++] = bitangent.y;
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bitangents[bitangentIndex++] = bitangent.z;
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}
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}
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var attributes = new GeometryAttributes();
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if (vertexFormat.position) {
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attributes.position = new GeometryAttribute({
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componentDatatype: ComponentDatatype.DOUBLE,
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componentsPerAttribute: 3,
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values: flatPositions,
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});
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}
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if (vertexFormat.normal) {
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attributes.normal = new GeometryAttribute({
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componentDatatype: ComponentDatatype.FLOAT,
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componentsPerAttribute: 3,
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values: normals,
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});
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}
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if (vertexFormat.tangent) {
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attributes.tangent = new GeometryAttribute({
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componentDatatype: ComponentDatatype.FLOAT,
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componentsPerAttribute: 3,
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values: tangents,
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});
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}
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if (vertexFormat.bitangent) {
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attributes.bitangent = new GeometryAttribute({
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componentDatatype: ComponentDatatype.FLOAT,
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componentsPerAttribute: 3,
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values: bitangents,
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});
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}
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if (vertexFormat.st) {
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attributes.st = new GeometryAttribute({
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componentDatatype: ComponentDatatype.FLOAT,
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componentsPerAttribute: 2,
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values: textureCoordinates,
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});
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}
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return new Geometry({
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attributes: attributes,
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indices: newIndices,
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primitiveType: PrimitiveType.TRIANGLES,
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});
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}
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/**
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* A description of a polygon composed of arbitrary coplanar positions.
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*
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* @alias CoplanarPolygonGeometry
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* @constructor
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*
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* @param {Object} options Object with the following properties:
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* @param {PolygonHierarchy} options.polygonHierarchy A polygon hierarchy that can include holes.
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* @param {Number} [options.stRotation=0.0] The rotation of the texture coordinates, in radians. A positive rotation is counter-clockwise.
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* @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
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* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid to be used as a reference.
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*
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* @example
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* var polygonGeometry = new Cesium.CoplanarPolygonGeometry({
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* polygonHierarchy: new Cesium.PolygonHierarchy(
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* Cesium.Cartesian3.fromDegreesArrayHeights([
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* -90.0, 30.0, 0.0,
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* -90.0, 30.0, 300000.0,
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* -80.0, 30.0, 300000.0,
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* -80.0, 30.0, 0.0
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* ]))
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* });
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*
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*/
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function CoplanarPolygonGeometry(options) {
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options = defaultValue(options, defaultValue.EMPTY_OBJECT);
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var polygonHierarchy = options.polygonHierarchy;
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//>>includeStart('debug', pragmas.debug);
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Check.defined("options.polygonHierarchy", polygonHierarchy);
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//>>includeEnd('debug');
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var vertexFormat = defaultValue(options.vertexFormat, VertexFormat.DEFAULT);
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this._vertexFormat = VertexFormat.clone(vertexFormat);
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this._polygonHierarchy = polygonHierarchy;
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this._stRotation = defaultValue(options.stRotation, 0.0);
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this._ellipsoid = Ellipsoid.clone(
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defaultValue(options.ellipsoid, Ellipsoid.WGS84)
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);
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this._workerName = "createCoplanarPolygonGeometry";
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/**
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* The number of elements used to pack the object into an array.
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* @type {Number}
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*/
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this.packedLength =
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PolygonGeometryLibrary.computeHierarchyPackedLength(polygonHierarchy) +
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VertexFormat.packedLength +
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Ellipsoid.packedLength +
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2;
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}
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/**
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* A description of a coplanar polygon from an array of positions.
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*
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* @param {Object} options Object with the following properties:
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* @param {Cartesian3[]} options.positions An array of positions that defined the corner points of the polygon.
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* @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
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* @param {Number} [options.stRotation=0.0] The rotation of the texture coordinates, in radians. A positive rotation is counter-clockwise.
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* @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid to be used as a reference.
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* @returns {CoplanarPolygonGeometry}
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*
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* @example
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* // create a polygon from points
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* var polygon = Cesium.CoplanarPolygonGeometry.fromPositions({
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* positions : Cesium.Cartesian3.fromDegreesArray([
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* -72.0, 40.0,
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* -70.0, 35.0,
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* -75.0, 30.0,
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* -70.0, 30.0,
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* -68.0, 40.0
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* ])
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* });
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* var geometry = Cesium.PolygonGeometry.createGeometry(polygon);
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*
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* @see PolygonGeometry#createGeometry
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*/
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CoplanarPolygonGeometry.fromPositions = function (options) {
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options = defaultValue(options, defaultValue.EMPTY_OBJECT);
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//>>includeStart('debug', pragmas.debug);
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Check.defined("options.positions", options.positions);
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//>>includeEnd('debug');
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var newOptions = {
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polygonHierarchy: {
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positions: options.positions,
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},
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vertexFormat: options.vertexFormat,
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stRotation: options.stRotation,
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ellipsoid: options.ellipsoid,
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};
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return new CoplanarPolygonGeometry(newOptions);
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};
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/**
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* Stores the provided instance into the provided array.
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*
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* @param {CoplanarPolygonGeometry} value The value to pack.
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* @param {Number[]} array The array to pack into.
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* @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
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*
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* @returns {Number[]} The array that was packed into
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*/
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CoplanarPolygonGeometry.pack = function (value, array, startingIndex) {
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//>>includeStart('debug', pragmas.debug);
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Check.typeOf.object("value", value);
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Check.defined("array", array);
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//>>includeEnd('debug');
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startingIndex = defaultValue(startingIndex, 0);
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startingIndex = PolygonGeometryLibrary.packPolygonHierarchy(
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value._polygonHierarchy,
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array,
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startingIndex
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);
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Ellipsoid.pack(value._ellipsoid, array, startingIndex);
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startingIndex += Ellipsoid.packedLength;
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VertexFormat.pack(value._vertexFormat, array, startingIndex);
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startingIndex += VertexFormat.packedLength;
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array[startingIndex++] = value._stRotation;
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array[startingIndex] = value.packedLength;
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return array;
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};
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var scratchEllipsoid = Ellipsoid.clone(Ellipsoid.UNIT_SPHERE);
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var scratchVertexFormat = new VertexFormat();
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var scratchOptions = {
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polygonHierarchy: {},
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};
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/**
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* Retrieves an instance from a packed array.
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*
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* @param {Number[]} array The packed array.
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* @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
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* @param {CoplanarPolygonGeometry} [result] The object into which to store the result.
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* @returns {CoplanarPolygonGeometry} The modified result parameter or a new CoplanarPolygonGeometry instance if one was not provided.
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*/
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CoplanarPolygonGeometry.unpack = function (array, startingIndex, result) {
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//>>includeStart('debug', pragmas.debug);
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Check.defined("array", array);
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//>>includeEnd('debug');
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startingIndex = defaultValue(startingIndex, 0);
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var polygonHierarchy = PolygonGeometryLibrary.unpackPolygonHierarchy(
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array,
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startingIndex
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);
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startingIndex = polygonHierarchy.startingIndex;
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delete polygonHierarchy.startingIndex;
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var ellipsoid = Ellipsoid.unpack(array, startingIndex, scratchEllipsoid);
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startingIndex += Ellipsoid.packedLength;
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var vertexFormat = VertexFormat.unpack(
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array,
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startingIndex,
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scratchVertexFormat
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);
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startingIndex += VertexFormat.packedLength;
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var stRotation = array[startingIndex++];
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var packedLength = array[startingIndex];
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if (!defined(result)) {
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result = new CoplanarPolygonGeometry(scratchOptions);
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}
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result._polygonHierarchy = polygonHierarchy;
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result._ellipsoid = Ellipsoid.clone(ellipsoid, result._ellipsoid);
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result._vertexFormat = VertexFormat.clone(vertexFormat, result._vertexFormat);
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result._stRotation = stRotation;
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result.packedLength = packedLength;
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return result;
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};
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/**
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* Computes the geometric representation of an arbitrary coplanar polygon, including its vertices, indices, and a bounding sphere.
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*
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* @param {CoplanarPolygonGeometry} polygonGeometry A description of the polygon.
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* @returns {Geometry|undefined} The computed vertices and indices.
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*/
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CoplanarPolygonGeometry.createGeometry = function (polygonGeometry) {
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var vertexFormat = polygonGeometry._vertexFormat;
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var polygonHierarchy = polygonGeometry._polygonHierarchy;
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var stRotation = polygonGeometry._stRotation;
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var outerPositions = polygonHierarchy.positions;
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outerPositions = arrayRemoveDuplicates(
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outerPositions,
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Cartesian3.equalsEpsilon,
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true
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);
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if (outerPositions.length < 3) {
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return;
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}
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var normal = scratchNormal;
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var tangent = scratchTangent;
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var bitangent = scratchBitangent;
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var axis1 = axis1Scratch;
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var axis2 = axis2Scratch;
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var validGeometry = CoplanarPolygonGeometryLibrary.computeProjectTo2DArguments(
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outerPositions,
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centerScratch,
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axis1,
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axis2
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);
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if (!validGeometry) {
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return undefined;
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}
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normal = Cartesian3.cross(axis1, axis2, normal);
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normal = Cartesian3.normalize(normal, normal);
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if (
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!Cartesian3.equalsEpsilon(
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centerScratch,
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Cartesian3.ZERO,
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CesiumMath.EPSILON6
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)
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) {
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var surfaceNormal = polygonGeometry._ellipsoid.geodeticSurfaceNormal(
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centerScratch,
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surfaceNormalScratch
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);
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if (Cartesian3.dot(normal, surfaceNormal) < 0) {
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normal = Cartesian3.negate(normal, normal);
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axis1 = Cartesian3.negate(axis1, axis1);
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}
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}
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var projectPoints = CoplanarPolygonGeometryLibrary.createProjectPointsTo2DFunction(
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centerScratch,
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axis1,
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axis2
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);
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var projectPoint = CoplanarPolygonGeometryLibrary.createProjectPointTo2DFunction(
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centerScratch,
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axis1,
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axis2
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);
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if (vertexFormat.tangent) {
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tangent = Cartesian3.clone(axis1, tangent);
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}
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if (vertexFormat.bitangent) {
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bitangent = Cartesian3.clone(axis2, bitangent);
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}
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var results = PolygonGeometryLibrary.polygonsFromHierarchy(
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polygonHierarchy,
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projectPoints,
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false
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);
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var hierarchy = results.hierarchy;
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var polygons = results.polygons;
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if (hierarchy.length === 0) {
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return;
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}
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outerPositions = hierarchy[0].outerRing;
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var boundingSphere = BoundingSphere.fromPoints(outerPositions);
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var boundingRectangle = PolygonGeometryLibrary.computeBoundingRectangle(
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normal,
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projectPoint,
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outerPositions,
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stRotation,
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scratchBR
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);
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var geometries = [];
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for (var i = 0; i < polygons.length; i++) {
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var geometryInstance = new GeometryInstance({
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geometry: createGeometryFromPolygon(
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polygons[i],
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vertexFormat,
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boundingRectangle,
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stRotation,
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projectPoint,
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normal,
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tangent,
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bitangent
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),
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});
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geometries.push(geometryInstance);
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}
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var geometry = GeometryPipeline.combineInstances(geometries)[0];
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geometry.attributes.position.values = new Float64Array(
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geometry.attributes.position.values
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);
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geometry.indices = IndexDatatype.createTypedArray(
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geometry.attributes.position.values.length / 3,
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geometry.indices
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);
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var attributes = geometry.attributes;
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if (!vertexFormat.position) {
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delete attributes.position;
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}
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return new Geometry({
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attributes: attributes,
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indices: geometry.indices,
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primitiveType: geometry.primitiveType,
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boundingSphere: boundingSphere,
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});
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};
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export default CoplanarPolygonGeometry;
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