43 lines
1.6 KiB
TypeScript
43 lines
1.6 KiB
TypeScript
module es {
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/** 提供帧定时信息 */
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export class Time {
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/** 游戏运行的总时间 */
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public static totalTime: number = 0;
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/** deltaTime的未缩放版本。不受时间尺度的影响 */
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public static unscaledDeltaTime: number = 0;
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/** 前一帧到当前帧的时间增量,按时间刻度进行缩放 */
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public static deltaTime: number = 0;
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/** 时间刻度缩放 */
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public static timeScale = 1;
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/** 已传递的帧总数 */
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public static frameCount = 0;
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/** 自场景加载以来的总时间 */
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public static timeSinceSceneLoad: number = 0;
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private static _lastTime = 0;
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public static update(currentTime: number) {
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let dt = (currentTime - this._lastTime) / 1000;
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this.totalTime += dt;
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this.deltaTime = dt * this.timeScale;
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this.unscaledDeltaTime = dt;
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this.timeSinceSceneLoad += dt;
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this.frameCount++;
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this._lastTime = currentTime;
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}
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public static sceneChanged() {
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this.timeSinceSceneLoad = 0;
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}
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/**
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* 允许在间隔检查。只应该使用高于delta的间隔值,否则它将始终返回true。
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* @param interval
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*/
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public static checkEvery(interval: number) {
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// 我们减去了delta,因为timeSinceSceneLoad已经包含了这个update ticks delta
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return this.timeSinceSceneLoad / interval > (this.timeSinceSceneLoad - this.deltaTime) / interval;
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}
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}
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}
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