canvas绘制的直线动画

时间：2021-05-28

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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