<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#MyCanvas {
background-color: cornflowerblue;
}
</style>
<script type="text/javascript">
//带有绘制过程的动画
/* var i = 1;
var x = 1;
var y = 200;
function moveSin(){
var my_canvas = document.getElementById( "MyCanvas" );
var content = my_canvas.getContext( "2d" );
content.beginPath();
content.moveTo( x, y );
i += 0.1;
x = i * 10;
y = Math.sin( i ) * 20 + 200;
content.lineTo( x, y );
content.stroke();
content.closePath();
console.log(x);
if(x>=1000){
console.log("end");
window.clearInterval(myTime);
}
}
var myTime = setInterval( moveSin, 10 );*/
var a=0.1;//控制线体的柔韧度,越大柔韧度越差
var b=10;//波浪大小,越大,波浪 越大
var c=10;//波浪 高度,越大,波浪越高
function draw(){
var my_canvas = document.getElementById( "MyCanvas" );
var content = my_canvas.getContext( "2d" );
content.beginPath();
content.moveTo( 1, my_canvas.height/2 );
for( var i = 1; i < 100; i += a ){ // x 应该等于canvas的 width/10
var x = i * b;
var y = Math.sin( i ) * c + my_canvas.height/2;
content.lineTo( x, y );
console.log(x);
}
content.stroke();
content.closePath();
}
</script>
</head>
<body onload="draw()">
<canvas id = "MyCanvas" width="1000" height="400"></canvas>
</body>
</html>