mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-24 21:16:50 +03:00
176 lines
5.7 KiB
HTML
176 lines
5.7 KiB
HTML
<html>
|
|
<head>
|
|
<meta charset="UTF-8" />
|
|
<title>Conway's Game of Life</title>
|
|
<link rel="stylesheet" type="text/css" href="resource:internal.css" />
|
|
<style>
|
|
canvas#surface {
|
|
width: 50vmin;
|
|
height: 50vmin;
|
|
border: 2px solid black;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body class="ns-even-bg ns-even-fg ns-border">
|
|
<h1 class="ns-border">Conway's Game of Life</h1>
|
|
<div style="margin: 1em;">
|
|
<div>
|
|
Run: <input id="running" type="checkbox" checked/><br />
|
|
Set Size: <input id="width" type="text" size="4" value="50" /> x
|
|
<input id="height" type="text" size="4" value="50" />
|
|
<button id="commitsize">Commit</button><br />
|
|
</div>
|
|
<div>
|
|
<canvas id="surface" width="50" height="50">
|
|
Sorry, you can't play Game of Life if JavaScript is turned off
|
|
</canvas>
|
|
</div>
|
|
<div>
|
|
<button id="random">Randomise</button>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
<script>
|
|
(function () {
|
|
const running = document.getElementById("running");
|
|
const iwidth = document.getElementById("width");
|
|
const iheight = document.getElementById("height");
|
|
const surface = document.getElementById("surface");
|
|
const context = surface.getContext("2d");
|
|
var width = surface.width - 10;
|
|
var height = surface.height - 10;
|
|
var frame = context.createImageData(width, height);
|
|
var drawto = context.createImageData(width, height);
|
|
var greyto = context.createImageData(width, height);
|
|
const greylevel = 31;
|
|
|
|
function getOffset(x, y) {
|
|
if (x < 0) {
|
|
x = width + x;
|
|
}
|
|
if (y < 0) {
|
|
y = height + y;
|
|
}
|
|
if (x >= width) {
|
|
x = x - width;
|
|
}
|
|
if (y >= height) {
|
|
y = y - height;
|
|
}
|
|
return (y * width + x) * 4;
|
|
}
|
|
function getCell(x, y) {
|
|
const offset = getOffset(x, y);
|
|
return frame.data[offset + 3] != 0;
|
|
}
|
|
function setCell(x, y) {
|
|
const offset = getOffset(x, y);
|
|
drawto.data[offset + 3] = 255;
|
|
greyto.data[offset + 3] = greylevel;
|
|
}
|
|
function clearCell(x, y) {
|
|
const offset = getOffset(x, y);
|
|
drawto.data[offset + 3] = 0;
|
|
greyto.data[offset + 3] = 0;
|
|
}
|
|
function countNeighbours(x, y) {
|
|
return (
|
|
getCell(x - 1, y - 1) +
|
|
getCell(x, y - 1) +
|
|
getCell(x + 1, y - 1) +
|
|
getCell(x - 1, y) +
|
|
getCell(x + 1, y) +
|
|
getCell(x - 1, y + 1) +
|
|
getCell(x, y + 1) +
|
|
getCell(x + 1, y + 1)
|
|
);
|
|
}
|
|
function flip() {
|
|
var temp = frame;
|
|
context.putImageData(drawto, 5, 5);
|
|
context.putImageData(greyto, 5 - width, 5 - height); /* top left */
|
|
context.putImageData(greyto, 5 - width, 5); /* left */
|
|
context.putImageData(greyto, 5, 5 - height); /* top */
|
|
context.putImageData(greyto, 5 + width, 5 + height); /* bottom right */
|
|
context.putImageData(greyto, 5 + width, 5); /* right */
|
|
context.putImageData(greyto, 5, 5 + height); /* bottom */
|
|
context.putImageData(greyto, 5 + width, 5 - height); /* top right */
|
|
context.putImageData(greyto, 5 - width, 5 + height); /* bottom left */
|
|
frame = drawto;
|
|
drawto = temp;
|
|
}
|
|
/* Game of life is run on a timer */
|
|
setInterval(function () {
|
|
if (!running.checked) {
|
|
return;
|
|
}
|
|
console.log("Frame");
|
|
/* To do a frame of GoL we compute by consuming frame and writing to drawto */
|
|
for (var y = 0; y < height; y++) {
|
|
for (var x = 0; x < width; x++) {
|
|
const neighbours = countNeighbours(x, y);
|
|
if (getCell(x, y)) {
|
|
if (neighbours == 2 || neighbours == 3) {
|
|
setCell(x, y); // live, 2/3 neigh => stay alive
|
|
} else {
|
|
clearCell(x, y); // live, <2/>3 neigh => dies
|
|
}
|
|
} else {
|
|
if (neighbours == 3) {
|
|
setCell(x, y); // dead, 3 neigh => born
|
|
} else {
|
|
clearCell(x, y); // dead, !3 neigh => stay dead
|
|
}
|
|
}
|
|
}
|
|
}
|
|
flip();
|
|
}, 100);
|
|
const randomise = function () {
|
|
var ofs = 3;
|
|
for (var y = 0; y < height; y++) {
|
|
for (var x = 0; x < width; x++) {
|
|
if (Math.random() < 0.5) {
|
|
drawto.data[ofs] = 0;
|
|
} else {
|
|
drawto.data[ofs] = 255;
|
|
greyto.data[ofs] = greylevel;
|
|
}
|
|
ofs += 4;
|
|
}
|
|
}
|
|
flip();
|
|
};
|
|
document.getElementById("random").addEventListener("click", randomise);
|
|
document
|
|
.getElementById("commitsize")
|
|
.addEventListener("click", function () {
|
|
const iwval = parseInt(iwidth.value, 10);
|
|
const ihval = parseInt(iheight.value, 10);
|
|
console.log(width, height, "->", iwval, ihval);
|
|
if (
|
|
(iwval != width || ihval != height) &&
|
|
iwval >= 10 &&
|
|
iwval <= 200 &&
|
|
ihval >= 10 &&
|
|
ihval <= 200
|
|
) {
|
|
console.log("yes");
|
|
surface.height = ihval + 10;
|
|
context.height = ihval + 10;
|
|
height = ihval;
|
|
surface.width = iwval + 10;
|
|
context.width = iwval + 10;
|
|
width = iwval;
|
|
frame = context.createImageData(width, height);
|
|
drawto = context.createImageData(width, height);
|
|
greyto = context.createImageData(width, height);
|
|
resetGrey();
|
|
randomise();
|
|
}
|
|
});
|
|
randomise();
|
|
})();
|
|
</script>
|
|
</html>
|