304 lines
8.3 KiB
HTML
304 lines
8.3 KiB
HTML
<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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var hertz;
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var height_px;
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var width_px;
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var height_c;
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var width_c;
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var cells;
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var timer;
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var effects;
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// set start/stop button value
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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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// generate an 2d array of cells based on current geometry
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function gen_cells() {
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var new_cells = new Array(height_c);
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for(var i = 0; i < height_c; i++) {
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new_cells[i] = new Array(width_c);
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}
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for (var y = 0; y < height_c; y++) {
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for (var x = 0; x < width_c; x++) {
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new_cells[y][x] = 0;
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}
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}
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return new_cells;
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}
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// init the cells
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function init_cells() {
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cells = gen_cells();
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}
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// Generate and populate the geometry variables
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// possibly over complicated from my experiment with an elastic resizeable board
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function get_demensions() {
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var canvas = document.getElementById('board');
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size = parseInt( document.getElementById('density').value);
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width_px = canvas.offsetWidth - (canvas.offsetWidth%size);
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canvas.width = width_px;
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width_c = width_px/ size;
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height_px = canvas.offsetHeight - (canvas.offsetHeight%size);
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canvas.height = height_px;
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height_c = height_px/size;
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//console.log(width_px + 'x' + height_px + ' => ' + width_c + 'x' +height_c);
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}
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// init the board
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// set vars
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// get geometry
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// generate cells for 1st time
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// draw
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function board_init() {
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var canvas = document.getElementById('board');
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document.getElementById('density').value = 10;
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get_demensions();
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btn_control_set_name('Start');
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document.getElementById('speed').value = 8;
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change_speed();
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init_cells();
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document.getElementById('effects').value=0;
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effects=0;
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redraw();
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}
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// Draw the current board: gird, then cells
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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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get_demensions();
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c.globalCompositeOperation = 'destination-over';
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c.clearRect(0, 0, width_px, height_px);
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c.fillStyle='rgba(0,0,0,0.)';
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c.strokeStyle= 'rgba(192,192,192,1)';
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c.beginPath();
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draw_grid(c);
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c.stroke();
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draw_cells(c);
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}
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// Generate a cycling darkening with age rainbow color
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// based on math/code from http://www.krazydad.com/makecolors.php
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function setStrokeAgeRainbow(l, c) {
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var frequency = 0.3;
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var center = 200; //128;
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var width = 55; //127;
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var red = Math.floor( (Math.sin(frequency*l + 0) * width + center) -l) ;
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var green = Math.floor( (Math.sin(frequency*l + 2) * width + center) -l);
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var blue = Math.floor( (Math.sin(frequency*l + 4) * width + center) -l);
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red = Math.max(0, red);
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green = Math.max(0, green);
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blue = Math.max(0, blue);
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c.strokeStyle= 'rgba('+red+','+green+','+blue+','+1+')';
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}
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// Draw all the cells onto the board inside the grid
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function draw_cells(c) {
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for (var y = 0; y < height_c; y++) {
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for (var x =0; x < width_c; x ++) {
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if (cells[y][x] != 0) {
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if(effects == 0) {
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c.strokeStyle = 'rgba(0,0,0,1)';
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} else {
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setStrokeAgeRainbow(cells[y][x], c);
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}
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c.fillStyle = c.strokeStyle;
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c.beginPath();
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c.moveTo(x*size +1, y*size+1);
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c.lineTo(x*size+ size-1, y*size+1);
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c.lineTo(x*size+ size-1, y*size + size-1);
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c.lineTo(x*size+1, y*size + size-1);
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// auto return home
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c.stroke();
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c.fill();
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}
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}
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}
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}
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// draw the grid and border
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function draw_grid(c) {
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// Horizontal lines
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for (var y = 0; y <= height_px; y += size) {
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c.moveTo(0, y);
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c.lineTo(width_px, y);
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}
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// Vertical lines
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for (var x = 0; x <= width_px; x += size) {
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c.moveTo(x, 0);
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c.lineTo(x, height_px);
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}
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}
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// When we've loaded, run!
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window.onload = board_init;
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// is a cell alive or dead
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// 0 for dead, 1 for alive
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// walls count as dead
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// used by num_neighbours
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function cell_value(x, y) {
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//console.log('(x:' + x + ',y:' + y + ') w/s:' + (width/size) + ' h/s:' + (height/size) );
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if (x < 0 || x >= width_c || y < 0 || y >= height_c) {
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return 0;
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} else {
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return cells[y][x] == 0 ? 0 : 1;
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}
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}
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// return the number of neighbours for a cell
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// walls count as dead
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function num_neighbours(x, y) {
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var n = 0;
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n += cell_value(x-1, y-1);
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n += cell_value(x, y-1);
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n += cell_value(x+1, y-1);
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n += cell_value(x-1, y);
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n += cell_value(x+1, y);
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n += cell_value(x-1, y+1);
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n += cell_value(x, y+1);
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n += cell_value(x+1, y+1);
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return n;
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}
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// Simulate one generation of cells
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// create a new cells 2d array and simulate the next generation
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// into it and then replace the current cells with it
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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_c; y++) {
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for(var x =0 ; x < width_c; x++) {
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var n = num_neighbours(x, y);
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if (cells[y][x] != 0) {
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if (n < 2 || n > 3) {
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new_cells[y][x] = 0;
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} else {
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new_cells[y][x] = cells[y][x] +1;
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}
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} else if (n == 3) {
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new_cells[y][x] = 1;
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} else {
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new_cells[y][x] = 0;
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}
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}
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}
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//new_cells[Math.floor(Math.random()*8)][ Math.floor(Math.random()*8) ] = true;
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cells = new_cells;
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}
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// Stop/Start button press
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function control_click() {
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var btn = document.getElementById('control-btn');
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if (btn.value == 'Start') {
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tick();
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btn.value = 'Stop';
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} else {
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clearTimeout(timmer);
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btn.value = 'Start';
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}
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}
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// Function to call on timmer
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// simulate on e generation,
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// redrawn
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// reset timmer
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function tick() {
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step();
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redraw();
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timmer = setTimeout('tick();', 1000.0/hertz);
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}
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// Handler for a click on the board to place/unplace a cell
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function board_click(e) {
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var canvas = document.getElementById('board');
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var x = Math.floor((e.pageX-canvas.offsetLeft)/size);
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var y = Math.floor((e.pageY-canvas.offsetTop)/size);
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cells[y][x] = ! cells[y][x];
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redraw();
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}
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// Change speed handler
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function change_speed() {
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hertz = parseInt(document.getElementById('speed').value);
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}
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// Resize board handler (kind of not used)
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// Left over from experiment in resiable elastic board
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// Abandoned because of problems with lining up mouse clicks on board
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// and weird stretcing issues
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function resize_cells() {
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var new_cells = gen_cells();
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var w = Math.min(width_c, cells[0].length);
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var h = Math.min(height_c, cells.length);
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for(var y = 0; y < h; y++) {
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for(x = 0; x < w; x++) {
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new_cells[y][x] = cells[y][x];
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}
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}
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cells = new_cells;
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}
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// What to do on a document resize (more usefull for elastic boards)
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function canvas_resize() {
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get_demensions();
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resize_cells();
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redraw();
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}
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</script>
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</head>
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<body onResize="canvas_resize();">
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Speed: <select id="speed" onChange="change_speed();">
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<option value="1">1 Hz</option>
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<option value="2">2 Hz</option>
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<option value="4">4 Hz</option>
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<option value="8">8 Hz</option>
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<option value="16">16 Hz</option>
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<option value="32">32 Hz</option>
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<option value="64">64 Hz</option>
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</select>
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Density: <select id="density" onChange="canvas_resize();">
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<option value="3">X-Small</option>
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<option value="5">Small</option>
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<option value="10">Medium</option>
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<option value="15">Large</option>
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<option value="20">X-Large</option>
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</select>
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Effects: <select id="effects" onChange="effects=parseInt(this.value); redraw();">
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<option value="0">None (black and white)</option>
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<option value="1">Color age (Raindbow)</option>
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</select>
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<input type="button" id="control-btn" onClick="control_click(); return false;" />
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<small style="margin-left:20px">Dan Ballard (2011) <<a href="mailto:dan@mindstab.net">dan@mindstab.net</a>></small>
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<input style="left:775px; position: absolute;" type="button" value="Clear" onClick="cells = gen_cells(); redraw();" />
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<br/>
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<canvas id="board" onClick="board_click(event);" width="800" height="400" style="/*width: 100%; height: 100%*/"></canvas>
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</body>
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</html>
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