72 lines
3.8 KiB
TypeScript
72 lines
3.8 KiB
TypeScript
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module es {
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/**
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* 一系列静态方法来处理所有常见的tween类型结构，以及它们的unclamped lerps.unclamped lerps对于超过0-1范围的bounce、elastic或其他tweens是必需的
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*/
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export class Lerps {
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public static lerp(from: number, to: number, t: number);
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public static lerp(from: Rectangle, to: Rectangle, t: number);
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public static lerp(from: Vector2, to: Vector2, t: number);
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public static lerp(from: any, to: any, t: number) {
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if (typeof(from) == "number" && typeof(to) == "number") {
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return from + (to - from) * t;
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}
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if (from instanceof Rectangle && to instanceof Rectangle) {
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return new Rectangle(
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(from.x + (to.x - from.x) * t),
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(from.y + (to.x - from.y) * t),
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(from.width + (to.width - from.width) * t),
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(from.height + (to.height - from.height) * t)
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);
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}
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if (from instanceof Vector2 && to instanceof Vector2) {
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return new Vector2(from.x + (to.x - from.x) * t, from.y + (to.y - from.y) * t);
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}
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}
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public static angleLerp(from: Vector2, to: Vector2, t: number) {
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// 我们计算这个lerp的最短角差
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let toMinusFrom = new Vector2(MathHelper.deltaAngle(from.x, to.x), MathHelper.deltaAngle(from.y, to.y));
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return new Vector2(from.x + toMinusFrom.x * t, from.y + toMinusFrom.y * t);
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}
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public static ease(easeType: EaseType, from: Rectangle, to: Rectangle, t: number, duration: number);
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public static ease(easeType: EaseType, from: Vector2, to: Vector2, t: number, duration: number);
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public static ease(easeType: EaseType, from: number, to: number, t: number, duration: number);
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public static ease(easeType: EaseType, from: any, to: any, t: number, duration: number) {
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if (typeof(from) == 'number' && typeof(to) == "number") {
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return this.lerp(from, to, EaseHelper.ease(easeType, t, duration));
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}
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if (from instanceof Vector2 && to instanceof Vector2) {
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return this.lerp(from, to, EaseHelper.ease(easeType, t, duration));
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}
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if (from instanceof Rectangle && to instanceof Rectangle) {
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return this.lerp(from, to, EaseHelper.ease(easeType, t, duration));
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}
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}
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public static easeAngle(easeType: EaseType, from: Vector2, to: Vector2, t: number, duration: number) {
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return this.angleLerp(from, to, EaseHelper.ease(easeType, t, duration));
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}
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/**
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* 使用半隐式欧拉方法。速度较慢，但总是很稳定。见
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* http://allenchou.net/2015/04/game-math-more-on-numeric-springing/
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* @param currentValue
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* @param targetValue
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* @param velocity Velocity的引用。如果在两次调用之间改变targetValue，请务必将其重置为0
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* @param dampingRatio 值越低，阻尼越小，值越高，阻尼越大，导致弹簧度越小，应在0.01-1之间，以避免系统不稳定
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* @param angularFrequency 角频率为2pi(弧度/秒)意味着振荡在一秒钟内完成一个完整的周期，即1Hz.应小于35左右才能保持稳定
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*/
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public static fastSpring(currentValue: Vector2, targetValue: Vector2, velocity: Vector2,
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dampingRatio: number, angularFrequency: number) {
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velocity.add(velocity.scale(-2 * Time.deltaTime * dampingRatio * angularFrequency)
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.add(targetValue.sub(currentValue).scale(Time.deltaTime * angularFrequency * angularFrequency)));
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currentValue.add(velocity.scale(Time.deltaTime));
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return currentValue;
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}
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}
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}
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