HTML5 Canvas 制作一个“在线画板”

来源：互联网发布：暴风雪数据编辑：程序博客网时间：2024/05/01 08:01

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script src="Jquery1.7.js"></script>
<style type="text/css">
#php100{ border:1px solid #ccc;}
</style>
<script type="text/javascript">
var canvas = document.getElementById('php100');
var p100=canvas.getContext("2d");
p100.lineWidth=10
p100.strokeStyle="red";
var pp=false;

$(function () {
$("#php100").mousedown(function (e) {
var mouseX = e.pageX - this.offsetLeft;
var mouseY = e.pageY - this.offsetTop;
pp = true;
p100.moveTo(mouseX, mouseY); //起始位置

})
//当鼠标抬起时
$("#php100").mouseup(function(e){
pp=false;
});

//当鼠标移动时
$("#php100").mousemove(function(e){

var mouseX = e.pageX - this.offsetLeft;
var mouseY = e.pageY - this.offsetTop;
if(pp){
p100.lineTo(mouseX,mouseY); //终止位置
p100.stroke(); //结束图形
}
})
})

</script>

</head>
<body>
<canvas id="php100" width="500" height="400"></canvas>

</body>
</html>