impliedchaos.github.io/circles.html at master · impliedchaos/impliedchaos.github.io · GitHub

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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
<!doctype html>
<html>
    <head>
		<meta charset="utf-8">
        <!-- <meta name="viewport" content="initial-scale=1.0; maximum-scale=1.0; user-scalable=0;"/> -->
		<title>Circles!</title>
		<style type="text/css">
			body { background-color: #444; color: #CCC; margin: 0px; overflow: hidden; }
			#info { top: 0px; width: 100%; color: #777; padding: 5px; text-align:center; }
            #container { text-align:center; }
            #container canvas { border:0px solid #777; }
            div { text-align:center; }
		</style>
	</head>
	<body>
      <br/>
		<div id="container"></div>
        <div>
        <span id="rlabel"></span><br/>
        Speed: <input id="sinp" type="range" min="1" max="10" value="1" /><span id="speed">1</span><br/>
        Width: <input id="ainp" type="range" min="1" max="100" step="1" value="25" /><span id="angle"></span><br/>
        <button onclick="bw=!bw;">Color/BW</button> <button onclick="fclear();">Clear</button></button><br/>
        <button onclick="pp();">Play/Pause</button> <button onclick="loop();">Step</button><br/>
        <button onclick="DUPIMAGE=!DUPIMAGE;">Copy to Image/No Copy</button><br/>
        </div>
        <div><img id="savestate"/></div>

		<script type="text/javascript">
			var WIDTH, HEIGHT,
            canvas, canvas2, canvas3,
			context, image, data, context2, context3;
            var rot1 = 0;
            var rot2 = 90;
            var speed = 5;
            var bw = 0;
            WIDTH = 500;
            HEIGHT = 278;
            var dot = Math.round(Math.sqrt(WIDTH/10));
            dot = 8;
            var GOGOGO = 0;
            var DUPIMAGE = 0;

			init();
            GOGOGO = setInterval(loop, 1000 / 60);

            function pp() {
              if (GOGOGO) {
                clearInterval(GOGOGO);
                GOGOGO = 0;
              } else {
                GOGOGO = setInterval(loop, 1000 / 60);
              }
            }

            function fclear() {
               context3.fillStyle="rgba(0,0,0,1)";
               context3.fillRect(0,0,WIDTH,HEIGHT);
               context.drawImage(canvas3,0,0,WIDTH,HEIGHT);
            }

			function init() {
				var container;

				container = document.getElementById('container');

				canvas = document.createElement("canvas");
				canvas.width = WIDTH;
				canvas.height = HEIGHT;
				canvas.style.width = WIDTH + "px";
				canvas.style.height = HEIGHT + "px";
//				canvas.style.width = window.innerWidth + "px";
//				canvas.style.height = window.innerHeight + "px";
				container.appendChild(canvas);

				context = canvas.getContext("2d");
				context.fillStyle = "rgb(0, 0, 0)";
				context.fillRect (0, 0, WIDTH, HEIGHT);
				image = context.getImageData(0, 0, WIDTH, HEIGHT);
				data = image.data;

				canvas2 = document.createElement("canvas");
				canvas2.width = WIDTH*1.05;
                canvas2.height = HEIGHT*1.05;
				context2 = canvas2.getContext("2d");

				canvas3 = document.createElement("canvas");
				canvas3.width = WIDTH;
                canvas3.height = HEIGHT;
				context3 = canvas3.getContext("2d");
			}

			function loop() {
               var ds, sx, sy;
               speed = Math.floor(document.getElementById("sinp").value);
               rot2 = Math.floor(document.getElementById("ainp").value);
               document.getElementById("rlabel").innerHTML=rot1;
               document.getElementById("angle").innerHTML=rot2;
               document.getElementById("speed").innerHTML=speed;


               rot1 = (rot1 + speed) % 720;
//             context2.drawImage(canvas,0,0,WIDTH,HEIGHT,0,0,WIDTH,HEIGHT);
//             context3.drawImage(canvas2,0,0,WIDTH,HEIGHT,0,0,WIDTH,HEIGHT);
               context3.fillStyle="rgba(255,255,255,1)";
               context3.fillRect(0,0,WIDTH,HEIGHT);

               function circus(x, y, w, style) {
                 var z = Math.round(WIDTH / w / 2);

                 context3.strokeStyle=style;
                 context3.lineWidth=w;
                 for (var i = 0; i < z; i++) {
                   context3.beginPath();
                   context3.arc(x,y,i*w*2+1,0,Math.PI*2);
                   context3.stroke();
                 }
               }

               circus(Math.floor(WIDTH/2)+Math.floor(Math.sin(rot1*Math.PI/360)*WIDTH*0.15+WIDTH*0.15),Math.floor(HEIGHT/2), rot2, "rgba(0,0,0,0.75)");
               circus(Math.floor(WIDTH/2)-Math.floor(Math.sin(rot1*Math.PI/360)*WIDTH*0.15+WIDTH*0.15),Math.floor(HEIGHT/2), rot2, "rgba(0,0,0,0.75)");

               context.drawImage(canvas3,0,0,WIDTH,HEIGHT);
               if (DUPIMAGE) {
                  var dURL = canvas.toDataURL();
                  document.getElementById("savestate").src = dURL;
               }
			}
		</script>
	</body>
</html>