1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
body{
height: 100vh;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
</body>
</html>
<script>
const canvas = document.querySelector("#canvas");
const ctx = canvas.getContext('2d');
const windowWidth = document.documentElement.clientWidth;
const windowHeight = document.documentElement.clientHeight;
canvas.width = windowWidth;
canvas.height = windowHeight;
ctx.fillStyle = 'black';
ctx.fillRect(0, 0, windowWidth, windowHeight);
function createPositon(min, max) {
return Math.floor(Math.random() * (max - min)) + min;
}
class newDotInfo {
constructor() {
this.centerX = windowWidth / 2;
this.centerY = windowHeight / 2;
this.x = createPositon(0, windowWidth);
this.y = createPositon(0,windowHeight);
this.width = createPositon(2, 8);
this.height = createPositon(2, 8);
this.speed = Math.ceil(Math.random() * 2);
this.xDirection = Math.random();
this.yDirection = Math.random();
}
move() {
if (this.xDirection > 0.5) {
this.x += this.speed;
}else if (this.xDirection <= 0.5) {
this.x -= this.speed;
}
if (this.yDirection > 0.5) {
this.y += this.speed;
}else if (this.yDirection <= 0.5) {
this.y -= this.speed;
}
ctx.fillStyle = 'white';
ctx.fillRect(this.x, this.y, this.width, this.height);
}
}
const arr = [];
function createDot() {
ctx.fillStyle = 'black';
ctx.fillRect(0, 0, windowWidth, windowHeight);
if(arr.length<100){
for (let j = 0; j < 5; j++) {
arr.push(new newDotInfo());
}
}
console.log(arr.length);
for (let i = 0; i < arr.length; i++) {
arr[i].move();
if(arr[i].x>windowWidth || arr[i].x<0 || arr[i].y<0 || arr[i].y>windowHeight){
arr.splice(i,1);
}
}
window.requestAnimationFrame(createDot);
}
createDot();
/* setInterval(() => {
createDot();
}, 60); */
</script>
|
