dragonbones-runtime
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the tools to build dragonbones file for diffrent framework
173 lines (155 loc) • 5.46 kB
text/typescript
//////////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2014-present, Egret Technology.
// All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Egret nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY EGRET AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL EGRET AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//////////////////////////////////////////////////////////////////////////////////////
namespace eui.sys {
/**
* @private
*
* @param fraction
* @returns
*/
function sineInOut(fraction:number):number {
return -0.5 * (Math.cos(Math.PI * fraction) - 1)
}
/**
* @private
* 数值缓动工具类
*/
export class Animation {
/**
* @private
*/
public constructor(updateFunction:(animation:Animation)=>void, thisObject:any) {
this.updateFunction = updateFunction;
this.thisObject = thisObject;
}
/**
* @private
* 此动画的缓动行为。设置为null意味着不使用缓动，默认值为 sineInOut
*/
public easerFunction:(fraction:number)=>number = sineInOut;
/**
* @private
*/
private thisObject:any;
/**
* @private
* 是否正在播放动画，不包括延迟等待和暂停的阶段
*/
public isPlaying:boolean = false;
/**
* @private
* 动画持续时间,单位毫秒，默认值500
*/
public duration:number = 500;
/**
* @private
* 动画到当前时间对应的值。
*/
public currentValue:number = 0;
/**
* @private
* 起始值
*/
public from:number = 0;
/**
* @private
* 终点值。
*/
public to:number = 0;
/**
* @private
* 动画启动时刻
*/
private startTime:number = 0;
/**
* @private
* 动画播放结束时的回调函数
*/
public endFunction:(animation:Animation) => void = null;
/**
* @private
* 动画更新时的回调函数
*/
public updateFunction:Function;
/**
* @private
* 开始正向播放动画,无论何时调用都重新从零时刻开始，若设置了延迟会首先进行等待。
*/
public play():void {
this.stop();
this.start();
}
/**
* @private
* 开始播放动画
*/
private start():void {
this.isPlaying = false;
this.currentValue = 0;
this.startTime = egret.getTimer();
this.doInterval(this.startTime);
egret.startTick(this.doInterval,this);
}
/**
* @private
* 停止播放动画
*/
public stop():void {
this.isPlaying = false;
this.startTime = 0;
egret.stopTick(this.doInterval,this);
}
/**
* @private
* 计算当前值并返回动画是否结束
*/
private doInterval(currentTime:number):boolean {
let runningTime = currentTime - this.startTime;
if (!this.isPlaying) {
this.isPlaying = true;
}
let duration = this.duration;
let fraction = duration == 0 ? 1 : Math.min(runningTime, duration) / duration;
if (this.easerFunction){
fraction = this.easerFunction(fraction);
}
this.currentValue = this.from + (this.to - this.from) * fraction;
if (this.updateFunction)
this.updateFunction.call(this.thisObject, this);
let isEnded = runningTime >= duration;
if (isEnded) {
this.stop();
}
if (isEnded && this.endFunction) {
this.endFunction.call(this.thisObject, this);
}
return false;
}
}
}