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GameOfLife-Crossover_test.html
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GameOfLife-Crossover_test.html
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<!DOCTYPE html>
<!-- saved from url=(0050)file:///C:/dev/github/js/GameOfLife-Crossover.html -->
<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Game of life</title>
</head>
<body>
<canvas id="canvas" width="1800" height="900" style="border:1px solid #d3d3d3;">
Your browsser does not support the HTML5 canvas tag.
</canvas>
<div id="info">
<span>Generation: </span><span id="generation">1</span>
</div>
<div id="buttons">
<input type="button" id="start" value="Start">
<input type="button" id="stop" value="Stop">
<input type="button" id="step" value="Next">
<input type="button" id="reset" value="Reset">
<input type="button" id="slower" value="Slower">
<input type="button" id="faster" value="Faster">
</div>
<script>
const colorLightGray = "#D3D3D3";
const colorGreen = "#008000";
const colorWhite = "#FFFFFF";
var cellSize = 30;
var columns = 60; // should be canvas height devided by cell size
var rows = 30; // should be canvas width devided by cell size
var width = cellSize*columns;
var height = cellSize*rows;
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var generation=0;
var gen = document.getElementById("generation");
var interval = 200; // milliseconds
var intervalId;
function Tuple(a,b) {
this.first = a;
this.second = b;
}
function drawGrid() {
ctx.strokeStyle = colorLightGray;
for (let i = 0; i < width; i += cellSize) {
ctx.moveTo(i, 0);
ctx.lineTo(i, height);
ctx.stroke();
}
for (let i = 0; i < height; i += cellSize) {
ctx.moveTo(0, i);
ctx.lineTo(width, i);
ctx.stroke();
}
}
// fill cell at (i, j) with color
function fillRect(i, j, color) {
ctx.fillStyle = color;
ctx.fillRect((i)*cellSize+1, (j)*cellSize+1, cellSize-2, cellSize-2);
}
function turnOn(i, j) {
fillRect(i, j, colorGreen);
}
function turnOff(i, j) {
fillRect(i, j, colorWhite);
}
// create an array of size m x n, initialized with v
function createArray(columns, rows, value) {
ret = new Array(columns);
for (let i = 0; i < columns; i++) {
ret[i] = new Array(rows).fill(value);
}
return ret;
}
// reset a 2D array
function resetArray2D(array, value) {
for (const e of array) {
e.fill(value);
}
}
// update neighbor count of a given cell (x, y)
// if (x, y) is not inside the grid, the coordinates are
// normalized so that another cell at the other side of
// the grid is updated.
// v is the delta to update neighbor count:
// v=1 to increment neighbor count
// v=-1 to decrease neighbor count
function updateNeighborCount(x, y, v) {
if (x<0) x=columns+x;
if (y<0) y=rows+y;
if (x>columns-1) x=0;
if (y>rows-1) y=0;
//console.log(x + ', ' + y + ' : ' + v);
neighborCount[x][y]+=v;
}
//cell and its neighbor coordinates
//[x-1][y-1] [x][y-1] [x+1][y-1]
//[x-1][y] [x][y] [x+1][y]
//[x-1][y+1] [x][y+1] [x+1][y+1]
// update neighbor count of neighbors
function updateNeighbors(x, y, v) {
updateNeighborCount(x-1, y-1, v);
updateNeighborCount(x , y-1, v);
updateNeighborCount(x+1, y-1, v);
updateNeighborCount(x-1, y , v);
updateNeighborCount(x+1, y , v);
updateNeighborCount(x-1, y+1, v);
updateNeighborCount(x , y+1, v);
updateNeighborCount(x+1, y+1, v);
}
// increase neighbor count of surrounding cells when adding new live cells
function incNeighborCount (x, y) {
updateNeighbors(x, y, 1);
}
// decrease neighbor count of surrounding cells when removing a dead cell
function decNeighborCount (x, y) {
updateNeighbors(x, y, -1);
}
// set cell (x, y) a live cell
function setLiveCell(x, y) {
if (occupations[x][y] != 1) {
//console.log('New live cell (' + x + ', ' + y + ')');
liveCells.push(new Tuple(x, y));
occupations[x][y] = 1;
incNeighborCount(x ,y);
turnOn(x, y);
}
}
// set cell (x, y) as dead cell
function setDeadCell(x, y) {
let idx = liveCells.findIndex(e => (e.first == x) && (e.second == y));
if (idx != -1) {
//console.log('Dead cell (' + x + ', ' + y + ')');
occupations[x][y] = 0;
liveCells.splice(idx, 1); // delete element by index
decNeighborCount(x,y);
turnOff(x,y);
}
}
// 1. Any live cell with two or three neighbors survives.
// 2. Any dead cell with three live neighbors becomes a live cell.
// 3. All other live cells die in the next generation. Similarly, all other dead cells stay dead.
function update() {
newLiveCells = [];
newDeadCells = [];
// check if a given dead cell becomes a live cell
function checkForNewLiveCell(x, y) {
if (x<0) x=columns+x;
if (y<0) y=rows+y;
if (x>columns-1) x=0;
if (y>rows-1) y=0;
if ((occupations[x][y]==0) && (neighborCount[x][y]==3)) {
occupations[x][y]=-1; // special flag to mark this cell becoming live, dont check again
newLiveCells.push( new Tuple(x, y));
}
}
// collect an array of new live cells from neighbors of the current
// live cells, because new live cells do not just come from nothing
for (const e of liveCells) {
checkForNewLiveCell(e.first-1, e.second-1);
checkForNewLiveCell(e.first , e.second-1);
checkForNewLiveCell(e.first+1, e.second-1);
checkForNewLiveCell(e.first-1, e.second );
checkForNewLiveCell(e.first+1, e.second );
checkForNewLiveCell(e.first-1, e.second+1);
checkForNewLiveCell(e.first , e.second+1);
checkForNewLiveCell(e.first+1, e.second+1);
}
// any other current live cells having less than 2 or more than 3 neighbors will die
for (const e of liveCells) {
if ((neighborCount[e.first][e.second] < 2) || (neighborCount[e.first][e.second] > 3))
newDeadCells.push (new Tuple(e.first, e.second));
}
// remove new dead cells
for (const e of newDeadCells) {
setDeadCell(e.first, e.second);
}
// create new live cells
for (const e of newLiveCells) {
setLiveCell(e.first, e.second);
}
generation += 1;
gen.innerText=generation;
}
// create a blinker pattern at (x, y)
function pattern_blinker(x, y) {
stop();
setLiveCell(x, y-1);
setLiveCell(x, y );
setLiveCell(x, y+1);
start();
}
// create a glider pattern at (x, y)
function pattern_glider(x, y) {
stop();
setLiveCell(x , y );
setLiveCell(x+1, y+1);
setLiveCell(x+2, y+1);
setLiveCell(x , y+2);
setLiveCell(x+1, y+2);
start();
}
// create a toad pattern at (x, y)
function pattern_toad(x, y) {
stop();
setLiveCell(x+1, y );
setLiveCell(x+2, y );
setLiveCell(x+3, y );
setLiveCell(x , y+1);
setLiveCell(x+1, y+1);
setLiveCell(x+2, y+1);
start();
}
// create an eater pattern at (x, y)
// xx
// x x
// x
// x
function pattern_eater(x, y) {
stop();
setLiveCell(x , y );
setLiveCell(x+1, y );
setLiveCell(x , y+1);
setLiveCell(x+2, y+1);
setLiveCell(x+2, y+2);
setLiveCell(x+2, y+3);
setLiveCell(x+3, y+3);
start();
}
// create a penta decathlon pattern at (x, y)
function pattern_pentadecathlon(x, y) {
stop();
setLiveCell(x+1, y );
setLiveCell(x+2, y );
setLiveCell(x+3, y );
setLiveCell(x , y+1);
setLiveCell(x+4, y+1);
setLiveCell(x , y+2);
setLiveCell(x+4, y+2);
setLiveCell(x+1, y+3);
setLiveCell(x+2, y+3);
setLiveCell(x+3, y+3);
setLiveCell(x+1, y+8);
setLiveCell(x+2, y+8);
setLiveCell(x+3, y+8);
setLiveCell(x , y+1+8);
setLiveCell(x+4, y+1+8);
setLiveCell(x , y+2+8);
setLiveCell(x+4, y+2+8);
setLiveCell(x+1, y+3+8);
setLiveCell(x+2, y+3+8);
setLiveCell(x+3, y+3+8);
start();
}
// stop timer
function stop() {
window.clearInterval(intervalId);
}
// start timer
function start() {
stop();
intervalId = window.setInterval(update, interval);
}
// test
function test() {
for (let i = 1; i < columns-15; i+= 15) {
for (let j = 1; j < rows-25; j+= 25) {
pattern_glider(i, j);
//pattern_pentadecathlon(i+10, j+10);
}
}
}
// get relative mouse position
function getMousePos(canvas, evt) {
var rect = canvas.getBoundingClientRect();
return {
x: evt.clientX - rect.left,
y: evt.clientY - rect.top
};
}
// get cell coordinate
function getCellCoord(pos) {
return {
x : Math.floor(pos.x / cellSize),
y : Math.floor(pos.y / cellSize)
}
}
// mouse event handling
function initMouseHandler() {
// while moving mouse hold Control to initialize live cells
// or hold Shift to uninitialize live cells
canvas.addEventListener('mousemove', function(evt) {
if (evt.ctrlKey) {
let mouseCoord = getCellCoord(getMousePos(canvas, evt));
setLiveCell(mouseCoord.x, mouseCoord.y);
}
if (evt.altKey) {
let mouseCoord = getCellCoord(getMousePos(canvas, evt));
setDeadCell(mouseCoord.x, mouseCoord.y);
}
}, false);
}
// create next generation
function step() {
stop();
update();
}
// reset everything
function reset() {
stop();
resetArray2D(neighborCount, 0);
resetArray2D(occupations, 0);
generation=0;
update();
}
// change speed by a number of milliseconds
function changeSpeed(ms) {
stop();
interval += ms;
start();
}
function slower() {
changeSpeed(100);
}
function faster() {
if (interval >= 200)
changeSpeed(-100);
}
drawGrid();
neighborCount = createArray(columns, rows, 0);
occupations = createArray(columns, rows, 0);
liveCells = [];
initMouseHandler();
// bind event handlers to buttons
document.getElementById('start').addEventListener('click', start, false);
document.getElementById('stop').addEventListener('click', stop, false);
document.getElementById('step').addEventListener('click', step, false);
document.getElementById('reset').addEventListener('click', reset, false);
document.getElementById('slower').addEventListener('click', slower, false);
document.getElementById('faster').addEventListener('click', faster, false);
//TODO
// 2. Buttons for predefined patterns
// 4. Load patterns from user
// 5. Save initial pattern (experimenting purposes)
// 1. Help/Guide
</script>
</body></html>