canvas绘制的直线动画
程序员文章站
2023-10-31 18:19:28
话不多说，请看代码：
话不多说，请看代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>first line</title>
<style type="text/css">
body{
background: #456e89;
}
.canvas {
height: 300px;
width: 300px;
margin: 0 auto;
font-family: arial;
}
</style>
</head>
<body>
<div class="canvas">
<canvas id="cvs" width="300" height="300"></canvas>
</div>
<script type="text/javascript">
var cvs = document.getelementbyid("cvs").getcontext("2d");
function anim(opt) { //初始化值
this.opt = opt;
}
//node 表示画布节点
//stax 表示开始x坐标
//stay 表示开始y坐标
//len表示终点坐标，
//timing表示运行的间隔时间，
//num表示坐标增长的大小
//direc表示判断绘制线条的方向，false表示x轴，ture表示y轴
//lw表示线宽的大小
//color 表示绘制线条颜色
anim.prototype.draw = function() { //绘制直线的线条
var opt = this.opt; //设置对象的属性
var adx = opt.stax;
var ady = opt.stay;
var that = {
x: opt.stax,
y: opt.stay
};
var time = setinterval(function() {
opt.direc //判断绘制方向
?
opt.len > ady ? ady += opt.num : ady -= opt.num :
opt.len > adx ? adx += opt.num : adx -= opt.num;
if(adx == opt.len || ady == opt.len) { //停止循环
clearinterval(time);
}
opt.node.beginpath(); // 开始绘制线条
opt.node.moveto(that.x, that.y);
opt.node.lineto(adx, ady);
opt.node.linewidth = opt.lw || 1;
opt.node.strokestyle = opt.color;
opt.node.stroke();
}, opt.timing);
};
anim.prototype.txt = function(opc) {//绘制文字
cvs.beginpath();
cvs.fillstyle = "rgba(255,255,255,"+opc+")";
cvs.font = "200px arial";
cvs.filltext("l", 100, 200);
};
var line1 = new anim({ //实例
node: cvs,
color: "#fff",
stax: 114,
stay: 58,
len: 134,
timing: 50,
num: 1,
direc: false,
lw: 2
});
line1.draw(); //执行绘制
var line2 = new anim({
node: cvs,
color: "#fff",
stax: 115,
stay: 58,
len: 200,
timing: 20,
num: 1,
direc: true,
lw: 2
});
line2.draw();
var line3 = new anim({
node: cvs,
color: "#fff",
stax: 133,
stay: 184,
len: 58,
timing: 20,
num: 1,
direc: true,
lw: 2
});
line3.draw();
var line4 = new anim({
node: cvs,
color: "#fff",
stax: 132,
stay: 184,
len: 203,
timing: 35,
num: 1,
direc: false,
lw: 2
});
line4.draw();
var line5 = new anim({
node: cvs,
color: "#fff",
stax: 203,
stay: 199,
len: 115,
timing: 35,
num: 1,
direc: false,
lw: 2
});
line5.draw();
var line6 = new anim({
node: cvs,
color: "#fff",
stax: 203,
stay: 199,
len: 184,
timing: 50,
num: 1,
direc: true,
lw: 2
});
line6.draw();
var test = new anim();//绘制文字实例
settimeout(function () {
var num = 0;
var times = setinterval(function () {
num++;
var t = num/100;
if(t === 1){
clearinterval(times);
}
test.txt(t);
},50)
},3000)
</script>
</body>
</html>
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