Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | 1x 8x 8x 8x 7x 6x 5x 1x 3003x 5x 4x 3x 1x 1x 1x 1x 1000x 1000x 1000x 1000x 1000x 1000x 1000x | import Cartesian3 from "../Core/Cartesian3.js";
import Check from "../Core/Check.js";
import CesiumMath from "../Core/Math.js";
const defaultDimensions = new Cartesian3(1.0, 1.0, 1.0);
/**
* A ParticleEmitter that emits particles within a box.
* Particles will be positioned randomly within the box and have initial velocities emanating from the center of the box.
*
* @alias BoxEmitter
* @constructor
*
* @param {Cartesian3} dimensions The width, height and depth dimensions of the box.
*/
function BoxEmitter(dimensions) {
dimensions = dimensions ?? defaultDimensions;
//>>includeStart('debug', pragmas.debug);
Check.defined("dimensions", dimensions);
Check.typeOf.number.greaterThanOrEquals("dimensions.x", dimensions.x, 0.0);
Check.typeOf.number.greaterThanOrEquals("dimensions.y", dimensions.y, 0.0);
Check.typeOf.number.greaterThanOrEquals("dimensions.z", dimensions.z, 0.0);
//>>includeEnd('debug');
this._dimensions = Cartesian3.clone(dimensions);
}
Object.defineProperties(BoxEmitter.prototype, {
/**
* The width, height and depth dimensions of the box in meters.
* @memberof BoxEmitter.prototype
* @type {Cartesian3}
* @default new Cartesian3(1.0, 1.0, 1.0)
*/
dimensions: {
get: function () {
return this._dimensions;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
Check.defined("value", value);
Check.typeOf.number.greaterThanOrEquals("value.x", value.x, 0.0);
Check.typeOf.number.greaterThanOrEquals("value.y", value.y, 0.0);
Check.typeOf.number.greaterThanOrEquals("value.z", value.z, 0.0);
//>>includeEnd('debug');
Cartesian3.clone(value, this._dimensions);
},
},
});
const scratchHalfDim = new Cartesian3();
/**
* Initializes the given {Particle} by setting it's position and velocity.
*
* @private
* @param {Particle} particle The particle to initialize.
*/
BoxEmitter.prototype.emit = function (particle) {
const dim = this._dimensions;
const halfDim = Cartesian3.multiplyByScalar(dim, 0.5, scratchHalfDim);
const x = CesiumMath.randomBetween(-halfDim.x, halfDim.x);
const y = CesiumMath.randomBetween(-halfDim.y, halfDim.y);
const z = CesiumMath.randomBetween(-halfDim.z, halfDim.z);
particle.position = Cartesian3.fromElements(x, y, z, particle.position);
particle.velocity = Cartesian3.normalize(
particle.position,
particle.velocity,
);
};
export default BoxEmitter;
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