Html5 canvas 飘扬的旗帜飘扬的旗帜 canvas.onmouseover=函数onmouseover(e){ 波滞后(标志,20,10,150,200,-0.1); } canvas.onmouseout=函数onMouseover(e){ }
上面的代码是当鼠标移动到旗子上时,旗子将摆动,当鼠标离开时,我如何停止摆动旗子?只需停止启动setInterval,该功能将停止Html5 canvas 飘扬的旗帜飘扬的旗帜 canvas.onmouseover=函数onmouseover(e){ 波滞后(标志,20,10,150,200,-0.1); } canvas.onmouseout=函数onMouseover(e){ },html5-canvas,Html5 Canvas,上面的代码是当鼠标移动到旗子上时,旗子将摆动,当鼠标离开时,我如何停止摆动旗子?只需停止启动setInterval,该功能将停止 <script type="text/javascript"> canvas.onmouseover = function onMouseover(e) { waveFlag( flag, 20, 10, 150, 200, -0.1 ); } canvas.onmouseout = function onMouseover(e) {
<script type="text/javascript">
canvas.onmouseover = function onMouseover(e) {
waveFlag( flag, 20, 10, 150, 200, -0.1 );
}
canvas.onmouseout = function onMouseover(e) {
}
</script>
var定时器=null;
函数波形滞后(画布、波长、振幅、周期、着色、挤压){
如果(!挤压)挤压=0;
如果(!shading)shading=100;
如果(!period)period=200;
如果(!振幅)振幅=10;
如果(!波长)波长=画布宽度/10;
var fps=30;
var ctx=canvas.getContext('2d');
var w=canvas.width,h=canvas.height;
var od=ctx.getImageData(0,0,w,h).data;
//变量ct=0,st=新日期;
返回setInterval(函数(){
var id=ctx.getImageData(0,0,w,h);
var d=id数据;
var now=(新日期)/期间;
对于(var y=0;yYou在onmouseout事件的正确轨道上。向我们展示flagswaving函数。此外,您不需要在赋值后命名函数。您可以在canvas中不使用onMouseover
分配它们。onMouseover=function(e){
<script type="text/javascript">
var timer = null;
function waveFlag( canvas, wavelength, amplitude, period, shading, squeeze ) {
if (!squeeze) squeeze = 0;
if (!shading) shading = 100;
if (!period) period = 200;
if (!amplitude) amplitude = 10;
if (!wavelength) wavelength = canvas.width/10;
var fps = 30;
var ctx = canvas.getContext('2d');
var w = canvas.width, h = canvas.height;
var od = ctx.getImageData(0,0,w,h).data;
// var ct = 0, st=new Date;
return setInterval(function(){
var id = ctx.getImageData(0,0,w,h);
var d = id.data;
var now = (new Date)/period;
for (var y=0;y<h;++y){
var lastO=0,shade=0;
var sq = (y-h/2)*squeeze;
for (var x=0;x<w;++x){
var px = (y*w + x)*4;
var pct = x/w;
var o = Math.sin(x/wavelength-now)*amplitude*pct;
var y2 = y + (o+sq*pct)<<0;
var opx = (y2*w + x)*4;
shade = (o-lastO)*shading;
d[px ] = od[opx ]+shade;
d[px+1] = od[opx+1]+shade;
d[px+2] = od[opx+2]+shade;
d[px+3] = od[opx+3];
lastO = o;
}
}
ctx.putImageData(id,0,0);
// if ((++ct)%100 == 0) console.log( 1000 * ct / (new Date - st));
},1000/fps);
}
var canvas = document.getElementById("flag");
canvas.onmouseover = function onMouseover(e) {
timer = waveFlag( flag, 20, 10, 150, 200, -0.1 );
}
canvas.onmouseout = function onMouseover(e) {
window.clearInterval(timer);
timer = null;
}
</script>