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JavaScript

import arrayRemoveDuplicates from "./arrayRemoveDuplicates.js";
import BoundingSphere from "./BoundingSphere.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 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 PolygonGeometryLibrary from "./PolygonGeometryLibrary.js";
import PrimitiveType from "./PrimitiveType.js";
function createGeometryFromPositions(positions) {
var length = positions.length;
var flatPositions = new Float64Array(length * 3);
var indices = IndexDatatype.createTypedArray(length, length * 2);
var positionIndex = 0;
var index = 0;
for (var i = 0; i < length; i++) {
var position = positions[i];
flatPositions[positionIndex++] = position.x;
flatPositions[positionIndex++] = position.y;
flatPositions[positionIndex++] = position.z;
indices[index++] = i;
indices[index++] = (i + 1) % length;
}
var attributes = new GeometryAttributes({
position: new GeometryAttribute({
componentDatatype: ComponentDatatype.DOUBLE,
componentsPerAttribute: 3,
values: flatPositions,
}),
});
return new Geometry({
attributes: attributes,
indices: indices,
primitiveType: PrimitiveType.LINES,
});
}
/**
* A description of the outline of a polygon composed of arbitrary coplanar positions.
*
* @alias CoplanarPolygonOutlineGeometry
* @constructor
*
* @param {Object} options Object with the following properties:
* @param {PolygonHierarchy} options.polygonHierarchy A polygon hierarchy that can include holes.
*
* @see CoplanarPolygonOutlineGeometry.createGeometry
*
* @example
* var polygonOutline = new Cesium.CoplanarPolygonOutlineGeometry({
* 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.CoplanarPolygonOutlineGeometry.createGeometry(polygonOutline);
*/
function CoplanarPolygonOutlineGeometry(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
var polygonHierarchy = options.polygonHierarchy;
//>>includeStart('debug', pragmas.debug);
Check.defined("options.polygonHierarchy", polygonHierarchy);
//>>includeEnd('debug');
this._polygonHierarchy = polygonHierarchy;
this._workerName = "createCoplanarPolygonOutlineGeometry";
/**
* The number of elements used to pack the object into an array.
* @type {Number}
*/
this.packedLength =
PolygonGeometryLibrary.computeHierarchyPackedLength(polygonHierarchy) + 1;
}
/**
* A description of a coplanar polygon outline 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.
* @returns {CoplanarPolygonOutlineGeometry}
*/
CoplanarPolygonOutlineGeometry.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,
},
};
return new CoplanarPolygonOutlineGeometry(newOptions);
};
/**
* Stores the provided instance into the provided array.
*
* @param {CoplanarPolygonOutlineGeometry} 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
*/
CoplanarPolygonOutlineGeometry.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
);
array[startingIndex] = value.packedLength;
return array;
};
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 {CoplanarPolygonOutlineGeometry} [result] The object into which to store the result.
* @returns {CoplanarPolygonOutlineGeometry} The modified result parameter or a new CoplanarPolygonOutlineGeometry instance if one was not provided.
*/
CoplanarPolygonOutlineGeometry.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 packedLength = array[startingIndex];
if (!defined(result)) {
result = new CoplanarPolygonOutlineGeometry(scratchOptions);
}
result._polygonHierarchy = polygonHierarchy;
result.packedLength = packedLength;
return result;
};
/**
* Computes the geometric representation of an arbitrary coplanar polygon, including its vertices, indices, and a bounding sphere.
*
* @param {CoplanarPolygonOutlineGeometry} polygonGeometry A description of the polygon.
* @returns {Geometry|undefined} The computed vertices and indices.
*/
CoplanarPolygonOutlineGeometry.createGeometry = function (polygonGeometry) {
var polygonHierarchy = polygonGeometry._polygonHierarchy;
var outerPositions = polygonHierarchy.positions;
outerPositions = arrayRemoveDuplicates(
outerPositions,
Cartesian3.equalsEpsilon,
true
);
if (outerPositions.length < 3) {
return;
}
var isValid = CoplanarPolygonGeometryLibrary.validOutline(outerPositions);
if (!isValid) {
return undefined;
}
var polygons = PolygonGeometryLibrary.polygonOutlinesFromHierarchy(
polygonHierarchy,
false
);
if (polygons.length === 0) {
return undefined;
}
var geometries = [];
for (var i = 0; i < polygons.length; i++) {
var geometryInstance = new GeometryInstance({
geometry: createGeometryFromPositions(polygons[i]),
});
geometries.push(geometryInstance);
}
var geometry = GeometryPipeline.combineInstances(geometries)[0];
var boundingSphere = BoundingSphere.fromPoints(polygonHierarchy.positions);
return new Geometry({
attributes: geometry.attributes,
indices: geometry.indices,
primitiveType: geometry.primitiveType,
boundingSphere: boundingSphere,
});
};
export default CoplanarPolygonOutlineGeometry;