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113 lines
4.2 KiB
113 lines
4.2 KiB
10 years ago
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# 自然运动
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10 years ago
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10 years ago
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- category: 动画
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10 years ago
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- order: 0
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10 years ago
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10 years ago
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---
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现实物体照着一定节奏移动，并不是一开始就移动很快的。
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当我们打开现代家具的门或抽屉时，首先会让它加速，然后慢下来。
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当电梯开关门时，它在打开或关闭时都有一段缓冲带，是先加速，然后慢下来。
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当某个东西往下掉时，首先是越掉越快，撞到地上后回弹，最终才又碰触地板。
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### 质量和重量
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在物理世界里，是以力量附加到物体对象里，加上自身的质量才完成一段动画。力量的持续时间决定物体的加速，减速与改变方向。
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动画停止与启动都不是瞬间完成的，因它需要一段缓冲的时间来加速或减速，因此，当动画有突然启动，停止或改变方向，都会显得很不自然。
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#### 自然缓动
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不要用直线缓动Linear做物体出入动画的缓动；注：Linear函数可做循环动画函数；
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如下图所示，在没有缓动的情况下启动与停止都显得突兀，感觉动画还没结束就停止了，所以在物体运动中避免直线运动；
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<script src="/static/TweenMax.min.js"></script>
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<script src="/static/motion.js"></script>
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<div id="J-Linear">
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</div>
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<script>
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$(function (){
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new Motion("#J-Linear",{lineData:[{open:[],end:[],stroke:"#f2666c"},{open:[0.455, 0.03, 0.515, 0.955],end:[0.455, 0.03, 0.515, 0.955],stroke:"#71B5DE",openEaseName:"easeInOutQuad",endEaseName:"easeInOutQuad"},],mask:false});
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})
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</script>
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上图所示缓动函数：红：Linear 蓝：easeInOutQuad；
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#### 出入动画
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不要做单向动画，进场后不做出场，直接消失元素或回到原点，会让整个画面不协调,反相只出不进也一样；
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所以有动画的进场必须要有动画的出场，包括导航上的动画；
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<div id="J-Symmetric">
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</div>
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<script>
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$(function (){
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new Motion("#J-Symmetric",{lineData:[
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{open:[0.455, 0.03, 0.515, 0.955],end:[],openEaseName:"easeInOutQuad",endEaseName:"null",stroke:"#f2666c"},
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{open:[0.645, 0.045, 0.355, 1],end:[0.645, 0.045, 0.355, 1],stroke:"#71B5DE",openEaseName:"easeInOutCubic",endEaseName:"easeInOutCubic"}],
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mask:false,exposure:"top"});
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})
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</script>
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上图所示缓动函数：红：easeInOutQuad 蓝：easeInOutCubic；
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##### 场外出入
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场外出入需要考虑力量与引力的关系，如向空中抛物体时，开始时力量大于引力时，速度是最快的，
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到达一定高度后，随着力量的减少，速度也跟随着降低，物体达到最高点后，力量等于引力或小于引力时，物体随之下降；
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所以在快到达最高点和掉下来时有一定缓冲带；不要做图示红色球体下降时的缓动；
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<div id="J-Entry">
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</div>
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<script>
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$(function (){
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new Motion("#J-Entry",{lineData:[
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{open:[0.25, 0.46, 0.45, 0.94],end:[0.25, 0.46, 0.45, 0.94],openEaseName:"easeOutQuad",endEaseName:"easeOutQuad",stroke:"#f2666c"},
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{open:[0.215, 0.61, 0.355, 1],end:[0.55, 0.055, 0.675, 0.19],stroke:"#71B5DE",openEaseName:"easeOutCubic",endEaseName:"easeInCubic"}],
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mask:true,exposure:"bottom"});
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})
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</script>
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上图所示缓动函数：红：easeOutQuad,easeOutQuad 蓝：easeOutCubic,easeInCubic；
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示例组件：<a href="/components/message/">Message全局提示</a>,<a href="/components/dropdown/">Dropdown下拉菜单</a>
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#### 弹性动画
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1.如蹦极跳下来时，刚跳下时速度很快，到达绳子的长度后，由于物体的重量再将绳子拉长再反弹,弹动几次后才停下。
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动画里也由质量来决定它的反弹，一般元素最好只弹动一次就够了，收回时可以用向下浮动再上拉或直接前缓动，可适用在下拉框与弹出元素;
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2.如球类物体掉地上的后，反弹几次后停止;
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注:
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1.曲线图用的是3次贝塞尔曲线，没法表示Bounce，所以用line替换;
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2.弹性动画最好结合alpha;
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<div id="J-Back">
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</div>
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<script>
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$(function (){
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new Motion("#J-Back",{lineData:[
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{open:[],end:[0.455, 0.03, 0.515, 0.955],openEaseName:"easeOutBounce",endEaseName:"easeInOutQuad",stroke:"#70f266"},
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{open:[0.175, 0.885, 0.32, 1.275],end:[0.6, -0.28, 0.735, 0.045],stroke:"#71B5DE",openEaseName:"easeOutBack",endEaseName:"easeInBack"}],
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mask:false,exposure:"top"});
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})
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</script>
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10 years ago
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上图所示缓动函数：红：easeOutBounce,easeInOutQuad 蓝：easeOutBack,easeInBack；
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