-
Notifications
You must be signed in to change notification settings - Fork 67
/
conway-game-of-life.html
209 lines (170 loc) · 5.5 KB
/
conway-game-of-life.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
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
<!DOCTYPE html>
<html>
<head>
<title>A-Frame: Conway's Game of Life</title>
<meta name="description" content="A-Frame Examples">
<script src="js/aframe-master-v1.3.0.min.js"></script>
<script src="js/aframe-environment-component.min.js"></script>
</head>
<body>
<script>
// "fixed" mod function
Number.prototype.mod = function(n)
{
return ((this%n)+n)%n;
}
class Cell
{
constructor()
{
this.prevState = null; // used to detect change (need to draw) when rendering?
this.currentState = 0; // 0:dead, 1:alive
this.nextState = null; // used to avoid creating a second board
this.count = 0; // # of live neighbors
}
}
AFRAME.registerComponent('draw-canvas', {
init: function()
{
this.canvas = document.querySelector("#mycanvas");
this.context = this.canvas.getContext("2d");
this.canvasSize = 512;
this.boardSize = 128;
this.cellSize = this.canvasSize / this.boardSize;
this.DEAD = 0;
this.ALIVE = 1;
this.cellColors = { 0: "#FFFF88", 1: "#0088FF" };
// used to identify cell neighbors
this.offsets = [ {dx:1, dy:0}, {dx:1, dy:1}, {dx:0, dy:1}, {dx:-1, dy:1},
{dx:-1, dy:0}, {dx:-1, dy:-1}, {dx:0, dy:-1}, {dx:1, dy:-1} ];
// board: 2D array of cells
this.board = [];
for (let rowNumber = 0; rowNumber < this.boardSize; rowNumber++)
{
let row = [];
for (let columnNumber = 0; columnNumber < this.boardSize; columnNumber++)
{
let cell = new Cell();
if ( Math.random() < 0.30 )
cell.currentState = 1;
else
cell.currentState = 0;
row.push( cell );
}
this.board.push(row);
}
// initialize canvas
this.context.fillStyle = this.cellColors[this.DEAD];
this.context.fillRect(0,0, this.canvasSize,this.canvasSize);
this.context.strokeStyle = "#BBBBBB";
this.context.lineWidth = 1;
// draw lines across rows
for (let rowNumber = 0; rowNumber < this.boardSize; rowNumber++)
{
this.context.beginPath();
this.context.moveTo(0, rowNumber * this.cellSize + 0.5);
this.context.lineTo(this.canvasSize, rowNumber * this.cellSize + 0.5);
this.context.closePath();
this.context.stroke();
}
// draw lines down columns
for (let columnNumber = 0; columnNumber < this.boardSize; columnNumber++)
{
this.context.beginPath();
this.context.moveTo(columnNumber * this.cellSize + 0.5, 0);
this.context.lineTo(columnNumber * this.cellSize + 0.5, this.canvasSize);
this.context.closePath();
this.context.stroke();
}
this.tickNumber = 0;
},
tick: function(t)
{
// slow down animation by updating every n-th tick...
this.tickNumber += 1;
if (this.tickNumber % 4 != 0)
return;
// update board state
// count adjacent neighbors currentState
for (let rowNumber = 0; rowNumber < this.boardSize; rowNumber++)
{
for (let columnNumber = 0; columnNumber < this.boardSize; columnNumber++)
{
let cell = this.board[rowNumber][columnNumber];
// count neighbors whose current state is ALIVE
cell.count = 0;
for (let i=0; i<8; i++)
{
if (this.board[ (rowNumber + this.offsets[i].dy).mod(this.boardSize) ][ (columnNumber + this.offsets[i].dx).mod(this.boardSize) ].currentState == this.ALIVE)
cell.count += 1;
}
if (cell.count < 2) // death by underpopulation
cell.nextState = 0;
else if (cell.count == 2) // stable
cell.nextState = cell.currentState;
else if (cell.count == 3) // birth
cell.nextState = 1;
else // (cell.count > 3) // death by overpopulation
cell.nextState = 0
}
}
// update current states to next states
for (let rowNumber = 0; rowNumber < this.boardSize; rowNumber++)
{
for (let columnNumber = 0; columnNumber < this.boardSize; columnNumber++)
{
let cell = this.board[rowNumber][columnNumber];
cell.prevState = cell.currentState;
cell.currentState = cell.nextState;
cell.nextState = null;
}
}
// update canvas
for (let rowNumber = 0; rowNumber < this.boardSize; rowNumber++)
{
for (let columnNumber = 0; columnNumber < this.boardSize; columnNumber++)
{
let cell = this.board[rowNumber][columnNumber];
let canvasY = rowNumber * this.cellSize;
let canvasX = columnNumber * this.cellSize;
// only redraw if cell has changed state
if (cell.currentState != cell.prevState)
{
this.context.fillStyle = this.cellColors[ cell.currentState ];
this.context.fillRect(canvasX+1, canvasY+1, this.cellSize-1, this.cellSize-1);
}
}
}
// update material map from canvas
// thanks to https://github.com/aframevr/aframe/issues/3936 for the update fix
let material = this.el.getObject3D('mesh').material;
if (!material.map)
return;
else
material.map.needsUpdate = true;
}
});
AFRAME.registerComponent('rotato', {
tick: function()
{
this.el.object3D.rotation.x += 0.005337;
this.el.object3D.rotation.y += 0.008049;
}
});
</script>
<!--
In a-scene, normally disable default lights with light="defaultLightsEnabled: false;"
Alternative approach needed when using environment component.
-->
<a-scene environment="preset: default; lighting: none;">
<a-assets>
<!-- texture sizes should be powers of 2 -->
<canvas id="mycanvas" width=512 height=512></canvas>
</a-assets>
<a-entity light="type: ambient; color: #AAA"></a-entity>
<a-entity light="type: directional; color: #BBB; intensity: 0.5" position="-0.5 1 1"></a-entity>
<a-torus position="0 2 -3" material = "src: #mycanvas;" draw-canvas rotato>
</a-torus>
</a-scene>
</body>
</html>