-
Notifications
You must be signed in to change notification settings - Fork 0
/
c01.html
101 lines (77 loc) · 1.76 KB
/
c01.html
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
<!DOCTYPE html>
<html>
<head>
<title>Example</title>
<style>
body {
background: #dddddd;
}
#canvas {
background: #ffffff;
border: thin inset #aaaaaa;
}
</style>
</head>
<body>
<canvas id='canvas' width="800" height="600">
Canvas not supported
</canvas>
<script>
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
function Ball() {
this.x = 0;
this.y = 0;
this.radius = 10;
this.color = "red";
this.angle = 0;
}
Ball.prototype = {
draw : function() {
context.save();
context.beginPath();
context.translate(this.x, this.y);
context.rotate(this.angle);
context.arc(0, 0, this.radius, 0, Math.PI * 2);
context.fillRect(0, 0, 30, 5);
context.fillStyle = this.color;
context.fill();
context.restore();
}
}
var ball = new Ball();
var ax = 0;
var ay = 0;
var vx = 0;
var vy = 0;
var friction = 0.98;
ball.x = 100;
ball.y = 100;
//ball.angle = 45 * Math.PI / 180;
canvas.onmousedown = function(e) {
ax = 0.5;
};
canvas.onmouseup = function(e) {
ax = 0;
};
requestAnimationFrame(loop);
function loop() {
context.clearRect(0, 0, canvas.width, canvas.height);
vx += ax;
vy += ay;
vx *= friction;
vy *= friction;
ball.x += vx;
ball.y += vy;
if(ball.x > canvas.width) {
ball.x = 0;
}
render();
requestAnimationFrame(loop);
}
function render() {
ball.draw();
}
</script>
</body>
</html>