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canvas动画气球

2024-09-23 17:50:04   215人阅读

            canvas小球的动画

我用canvas画布实现的小球动画效果，可以参考下
我用canvas画布实现的小球动画效果，可以参考下
我用canvas画布实现的小球动画效果，可以参考下
我用canvas画布实现的小球动画效果，可以参考下
我用canvas画布实现的小球动画效果，可以参考下

js是面向对象写的

步骤：
先写好封装的函数
Random 随机数
suanzi是小球碰撞后运行方向
dong是canvas画的随机圆
·························································································································
再去new这个构造函数，我一次性for循环new200个球，多少都可以,canvas性能可以的，换js写就会卡炸

弄个定时器，随便时间，setInterval.每次执行清除画布，再重构重新200个球，就有换球的效果了，看上去球就动了



每次都是canvas画的球，所以没有DOM，不会卡顿，性能杠杠的，有兴趣的可以试试吧

细节可以看代码：


1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>

 7 
12 </head>
13 <body>
14 <canvas id="wa" width="800" height="400"></canvas>
15 
16 </body>
17 </html>
18 <script>
19 
20     var hb = wa.getContext(‘2d‘);
21     var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘];
22 
23         var hb=wa.getContext(‘2d‘);
24         
25     function Random(max, min) {
26         return parseInt(Math.random() * (max - min) + min)
27     }
28     function Run() {
29         var r = Random(40, 20);
30         this.x = Random(wa.width - r, r);
31         this.y = Random(wa.height - r, r);
32         this.z = r;
33         this.c = ‘rgba(‘ + Random(255, 0) + ‘,‘ + Random(255, 0) + ‘,‘ + Random(255, 0) + ‘,‘ + Math.random().toFixed(1) + ‘)‘;
34         this.speedx = Random(10, -10);
35         this.speedy = Random(5, -5)
36     }
37 
38     Run.prototype.suanzi = function () {
39 
40         if (this.speedx == 0) {
41             this.speedx = 6;
42         }
43         if (this.speedy == 0) {
44             this.speedy = -4;
45         }
46 
47         if (this.x < this.z || wa.width - this.z < this.x) {
48             this.speedx *= -1;
49         }
50         if (this.y < this.z || wa.height - this.z < this.y) {
51             this.speedy *= -1;
52         }
53         this.x += this.speedx;
54         this.y += this.speedy;
55     };
56 
57     Run.prototype.dong = function () {
58 
59         hb.beginPath();
60         hb.arc(this.x, this.y, this.z, 0, Math.PI * 2);
61 
62         hb.fillStyle = this.c;
63         hb.fill();
64         hb.closePath();
65 
66     };
67 
68 
69     var palys = [];
70     for (var i = 0; i < 200; i++) {
71         var play = new Run();
72         play.dong();
73         palys.push(play);
74     }
75 
76     setInterval(function () {
77         hb.clearRect(0, 0, wa.width, wa.height);
78         for (var j = 0; j < palys.length; j++) {
79             palys[j].suanzi();
80             palys[j].dong();
81             console.log(palys[0])
82         }
83     }, 10);
84 
85 
86 </script>

 

canvas动画气球


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