41 lines
1.3 KiB
TypeScript
41 lines
1.3 KiB
TypeScript
|
import type { Particle } from '../Particle';
|
||
|
|
import type { IParticleModule } from './IParticleModule';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 旋转随生命周期变化模块
|
||
|
|
* Rotation over lifetime module
|
||
|
|
*/
|
||
|
|
export class RotationOverLifetimeModule implements IParticleModule {
|
||
|
|
readonly name = 'RotationOverLifetime';
|
||
|
|
enabled = true;
|
||
|
|
|
||
|
|
/** 角速度乘数起点 | Angular velocity multiplier start */
|
||
|
|
angularVelocityMultiplierStart: number = 1;
|
||
|
|
|
||
|
|
/** 角速度乘数终点 | Angular velocity multiplier end */
|
||
|
|
angularVelocityMultiplierEnd: number = 1;
|
||
|
|
|
||
|
|
/** 附加旋转（随生命周期累加的旋转量）| Additional rotation over lifetime */
|
||
|
|
additionalRotation: number = 0;
|
||
|
|
|
||
|
|
update(p: Particle, dt: number, normalizedAge: number): void {
|
||
|
|
// 应用角速度乘数 | Apply angular velocity multiplier
|
||
|
|
const multiplier = lerp(
|
||
|
|
this.angularVelocityMultiplierStart,
|
||
|
|
this.angularVelocityMultiplierEnd,
|
||
|
|
normalizedAge
|
||
|
|
);
|
||
|
|
|
||
|
|
p.rotation += p.angularVelocity * multiplier * dt;
|
||
|
|
|
||
|
|
// 附加旋转 | Additional rotation
|
||
|
|
if (this.additionalRotation !== 0) {
|
||
|
|
p.rotation += this.additionalRotation * dt;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function lerp(a: number, b: number, t: number): number {
|
||
|
|
return a + (b - a) * t;
|
||
|
|
}
|