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| 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 | 7x 7x 5x 1x 1003x 4x 1x 1x 1000x 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";
/**
* A ParticleEmitter that emits particles within a sphere.
* Particles will be positioned randomly within the sphere and have initial velocities emanating from the center of the sphere.
*
* @alias SphereEmitter
* @constructor
*
* @param {number} [radius=1.0] The radius of the sphere in meters.
*/
function SphereEmitter(radius) {
radius = radius ?? 1.0;
//>>includeStart('debug', pragmas.debug);
Check.typeOf.number.greaterThan("radius", radius, 0.0);
//>>includeEnd('debug');
this._radius = radius ?? 1.0;
}
Object.defineProperties(SphereEmitter.prototype, {
/**
* The radius of the sphere in meters.
* @memberof SphereEmitter.prototype
* @type {number}
* @default 1.0
*/
radius: {
get: function () {
return this._radius;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.number.greaterThan("value", value, 0.0);
//>>includeEnd('debug');
this._radius = value;
},
},
});
/**
* Initializes the given {Particle} by setting it's position and velocity.
*
* @private
* @param {Particle} particle The particle to initialize
*/
SphereEmitter.prototype.emit = function (particle) {
const theta = CesiumMath.randomBetween(0.0, CesiumMath.TWO_PI);
const phi = CesiumMath.randomBetween(0.0, CesiumMath.PI);
const rad = CesiumMath.randomBetween(0.0, this._radius);
const x = rad * Math.cos(theta) * Math.sin(phi);
const y = rad * Math.sin(theta) * Math.sin(phi);
const z = rad * Math.cos(phi);
particle.position = Cartesian3.fromElements(x, y, z, particle.position);
particle.velocity = Cartesian3.normalize(
particle.position,
particle.velocity,
);
};
export default SphereEmitter;
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