[英]Reproduce android's onfling event in javascript
我想在javascript中重现android的fling事件。我不明白我必须使用哪种类型的数学函数。我知道我必须计算鼠标在特定时间内移动了多少像素并执行fling基于此的动画,但我不知道如何在javascript中执行此操作。我必须根据我发现的最后一个速度(像素/时间)来进行弹跳动画,或者我必须基于所有我已经找到了速度?寻找速度必须使用哪种方法?
While this code is not fit for its intended purpose it does cause the 'sprite' to continue in motion after 'mouse-up' in the same direction and velocity. 尽管此代码不符合其预期目的,但确实会导致“精灵”在“鼠标”向上移动后以相同的方向和速度继续运动。
<!DOCTYPE html>
<html lang="en">
<head>
<title>Fling Me</title>
<style>
div{
position:absolute;
top:300px;
left:300px;
width:100px;
height:100px;
background-color:red;
}
</style>
</head>
<body>
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<div></div>
<script>
'use strict';
(function(){
var mm,ox,oy,el,t,l,tt=0,tl=0,dt=0,dl=0,tmr,s;
document.querySelector('div').addEventListener('mousedown',
function(ev){
el = ev.target;
s = el.style ;
ox=ev.offsetX; oy=ev.offsetY;
t=ev.clientY;l=ev.clientX;
tmr = setInterval(function(){
dt = tt - t;
dl = tl - l;
tt = t;
tl = l;
},30);
el.addEventListener('mousemove',
mm = function(ev){
t=ev.clientY;l=ev.clientX;
s.top = t - ox + 'px';
s.left = l - oy + 'px';
}
);
el.addEventListener('mouseup',
function(ev){
clearInterval(tmr);
el.removeEventListener('mousemove',mm);
tmr = setInterval(function(){
s.top = parseInt(s.top) - dt + 'px';
s.left = parseInt(s.left) - dl + 'px';
},30);
setTimeout("location.assign(location.href)",2000);
}
);
}
)})();
</script>
</body>
</html>
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