2011-06-16 06:30:30 +00:00
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<html>
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<head>
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<title>The Game of Life: HTML Canvas Demo</title>
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<script language="javascript">
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var size;
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2011-06-20 05:39:10 +00:00
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var hertz;
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2011-06-16 06:30:30 +00:00
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var height;
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var width;
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2011-06-16 14:15:21 +00:00
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var cells;
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2011-06-16 06:30:30 +00:00
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function btn_control_set_name(name) {
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var btn = document.getElementById('control-btn');
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btn.value = name;
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}
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2011-06-20 05:39:10 +00:00
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function gen_cells() {
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2011-06-16 14:15:21 +00:00
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var hcells = height/size;
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var wcells = width/size;
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2011-06-20 05:39:10 +00:00
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var new_cells = new Array(hcells);
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2011-06-16 14:15:21 +00:00
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for(var i = 0; i < hcells; i++) {
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2011-06-20 05:39:10 +00:00
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new_cells[i] = new Array(wcells);
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2011-06-16 14:15:21 +00:00
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}
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for (var y = 0; y < hcells; y++) {
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for (var x = 0; x < wcells; x++) {
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2011-06-20 05:39:10 +00:00
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new_cells[y][x] = false;
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2011-06-16 14:15:21 +00:00
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}
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}
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2011-06-20 05:39:10 +00:00
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return new_cells;
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}
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function init_cells() {
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cells = gen_cells();
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2011-06-16 14:15:21 +00:00
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}
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2011-06-16 06:30:30 +00:00
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function board_init() {
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2011-06-16 14:15:21 +00:00
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var canvas = document.getElementById('board');
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width = canvas.width;
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height = canvas.height;
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2011-06-16 06:30:30 +00:00
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btn_control_set_name('Start');
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size = 10;
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2011-06-20 05:39:10 +00:00
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hertz = 4;
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2011-06-16 14:15:21 +00:00
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init_cells();
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2011-06-16 06:30:30 +00:00
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redraw();
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}
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function redraw() {
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var canvas = document.getElementById('board');
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var c = canvas.getContext('2d');
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draw_grid(c);
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2011-06-16 14:15:21 +00:00
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c.stroke();
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cells[1][2] = true;
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cells[3][4] = true;
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cells[5][5] = true;
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draw_cells(c);
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c.stroke();
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c.fill();
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}
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function draw_cells(c) {
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var hcells = height/size;
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var wcells = width/size;
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for (var y = 0; y < hcells; y++) {
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for (var x =0; x < wcells; x ++) {
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if (cells[y][x] == true) {
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c.moveTo(x*size, y*size);
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c.lineTo(x*size+ size, y*size);
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c.lineTo(x*size+ size, y*size + size);
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c.lineTo(x*size, y*size + size);
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// auto return home?
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}
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}
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}
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2011-06-16 06:30:30 +00:00
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}
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function draw_grid(c) {
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// Horizontal lines
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for (var y = 0; y <= height; y += size) {
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c.moveTo(0, y);
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c.lineTo(width, y);
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}
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// Vertical lines
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for (var x = 0; x <= width; x += size) {
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c.moveTo(x, 0);
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c.lineTo(x, height);
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}
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}
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window.onload = board_init;
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2011-06-20 05:39:10 +00:00
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function step() {
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var new_cells = gen_cells();
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for(var y=0; y <= height; y++) {
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for(var x =0 ; x <= width; x++) {
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var n = num_neighbours(x, y);
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if (cells[y][x] == true) {
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if (n < 2 || n > 3) {
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new_cells[y][x] = false;
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} else {
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new_cells[y][x] = true;
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}
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} else if (n == 3) {
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new_cells[y][x] = true;
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} else {
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new_cells[y][x] = false;
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}
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}
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}
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}
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2011-06-16 06:30:30 +00:00
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</script>
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</head>
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<body>
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<input type="button" id="control-btn"/>
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<br/>
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<canvas width="800" height="400" id="board" ></canvas>
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</body>
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</html>
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