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76 lines
2.4 KiB
JavaScript
76 lines
2.4 KiB
JavaScript
import Cartesian3 from "../Core/Cartesian3.js";
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import Check from "../Core/Check.js";
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import defaultValue from "../Core/defaultValue.js";
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import CesiumMath from "../Core/Math.js";
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var defaultDimensions = new Cartesian3(1.0, 1.0, 1.0);
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/**
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* A ParticleEmitter that emits particles within a box.
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* Particles will be positioned randomly within the box and have initial velocities emanating from the center of the box.
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*
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* @alias BoxEmitter
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* @constructor
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*
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* @param {Cartesian3} dimensions The width, height and depth dimensions of the box.
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*/
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function BoxEmitter(dimensions) {
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dimensions = defaultValue(dimensions, defaultDimensions);
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//>>includeStart('debug', pragmas.debug);
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Check.defined("dimensions", dimensions);
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Check.typeOf.number.greaterThanOrEquals("dimensions.x", dimensions.x, 0.0);
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Check.typeOf.number.greaterThanOrEquals("dimensions.y", dimensions.y, 0.0);
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Check.typeOf.number.greaterThanOrEquals("dimensions.z", dimensions.z, 0.0);
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//>>includeEnd('debug');
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this._dimensions = Cartesian3.clone(dimensions);
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}
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Object.defineProperties(BoxEmitter.prototype, {
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/**
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* The width, height and depth dimensions of the box in meters.
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* @memberof BoxEmitter.prototype
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* @type {Cartesian3}
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* @default new Cartesian3(1.0, 1.0, 1.0)
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*/
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dimensions: {
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get: function () {
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return this._dimensions;
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},
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set: function (value) {
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//>>includeStart('debug', pragmas.debug);
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Check.defined("value", value);
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Check.typeOf.number.greaterThanOrEquals("value.x", value.x, 0.0);
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Check.typeOf.number.greaterThanOrEquals("value.y", value.y, 0.0);
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Check.typeOf.number.greaterThanOrEquals("value.z", value.z, 0.0);
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//>>includeEnd('debug');
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Cartesian3.clone(value, this._dimensions);
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},
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},
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});
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var scratchHalfDim = new Cartesian3();
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/**
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* Initializes the given {Particle} by setting it's position and velocity.
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*
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* @private
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* @param {Particle} particle The particle to initialize.
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*/
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BoxEmitter.prototype.emit = function (particle) {
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var dim = this._dimensions;
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var halfDim = Cartesian3.multiplyByScalar(dim, 0.5, scratchHalfDim);
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var x = CesiumMath.randomBetween(-halfDim.x, halfDim.x);
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var y = CesiumMath.randomBetween(-halfDim.y, halfDim.y);
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var z = CesiumMath.randomBetween(-halfDim.z, halfDim.z);
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particle.position = Cartesian3.fromElements(x, y, z, particle.position);
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particle.velocity = Cartesian3.normalize(
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particle.position,
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particle.velocity
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);
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};
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export default BoxEmitter;
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