phaser/Phaser/particles/NumericalIntegration.ts

/// <reference path="../_definitions.ts" />

module Phaser.Particles {

    export class NumericalIntegration {

        constructor(type) {
            this.type = ParticleUtils.initValue(type, ParticleManager.EULER);
        }

        type;

        integrate(particles, time, damping) {
            this.eulerIntegrate(particles, time, damping);
        }

        eulerIntegrate(particle, time, damping) {
            if (!particle.sleep)
            {
                particle.old.p.copy(particle.p);
                particle.old.v.copy(particle.v);
                particle.a.multiplyScalar(1 / particle.mass);
                particle.v.add(particle.a.multiplyScalar(time));
                particle.p.add(particle.old.v.multiplyScalar(time));
                if (damping)
                    particle.v.multiplyScalar(damping);
                particle.a.clear();
            }
        }

    }

}