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wireworld.js
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wireworld.js
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const CELL_NOTACELL = -1;
const CELL_EMPTY = 0;
const CELL_CONDUCTOR = 1;
const CELL_WIREHEAD = 2;
const CELL_WIRETAIL = 3;
const CELL_COLORS = ['#AAAAAA', '#DDDD00', '#FF0000', '#0000FF'];
const CELL_SIZE = 8;
function CellGrid(width, height) {
this.width = width;
this.height = height;
this.cells = new Array(width * height);
for(var i = 0; i < width * height; i++) {
this.cells[i] = CELL_EMPTY;
}
}
CellGrid.prototype = {
getCell: function(x, y) {
if (x < 0 || x >= this.width || y < 0 || y >= this.height) {
return CELL_NOTACELL;
}
return this.cells[y * this.width + x];
},
setCell: function(x, y, type) {
if (x < 0 || x >= this.width || y < 0 || y >= this.height) {
return false;
}
this.cells[y * this.width + x] = type;
return true;
},
getColor: function(x, y) {
type = this.getCell(x, y)
return type < 0 ? '#000000' : CELL_COLORS[type];
},
neighbors: function(x, y) {
var n1 = this.getCell(x - 1, y);
var n2 = this.getCell(x + 1, y);
var n3 = this.getCell(x, y - 1);
var n4 = this.getCell(x, y + 1);
var n5 = this.getCell(x - 1, y - 1);
var n6 = this.getCell(x + 1, y - 1);
var n7 = this.getCell(x - 1, y + 1);
var n8 = this.getCell(x + 1, y + 1);
var n = [];
if (n1 != CELL_NOTACELL)
n.push(n1);
if (n2 != CELL_NOTACELL)
n.push(n2);
if (n3 != CELL_NOTACELL)
n.push(n3);
if (n4 != CELL_NOTACELL)
n.push(n4);
if (n5 != CELL_NOTACELL)
n.push(n5);
if (n6 != CELL_NOTACELL)
n.push(n6);
if (n7 != CELL_NOTACELL)
n.push(n7);
if (n8 != CELL_NOTACELL)
n.push(n8);
return n;
},
draw: function(context) {
for(var x = 0; x < this.width; x++) {
for(var y = 0; y < this.height; y++) {
context.fillStyle = this.getColor(x, y);
context.fillRect(x * (CELL_SIZE + 1) + 1,
y * (CELL_SIZE + 1) + 1,
CELL_SIZE, CELL_SIZE);
}
}
},
runStep: function() {
var nextFrame = new Array(this.cells.length);
for (var x = 0; x < this.width; x++) {
for (var y = 0; y < this.height; y++) {
var type = CELL_EMPTY;
switch(this.getCell(x, y)) {
case CELL_EMPTY:
break;
case CELL_WIREHEAD:
type = CELL_WIRETAIL;
break;
case CELL_WIRETAIL:
type = CELL_CONDUCTOR;
break;
case CELL_CONDUCTOR:
var neighborList = this.neighbors(x, y);
var count = 0;
for (var i = 0; i < neighborList.length; i++) {
if (neighborList[i] == CELL_WIREHEAD)
count++;
}
if (count == 1 || count == 2)
type = CELL_WIREHEAD;
else
type = CELL_CONDUCTOR;
break;
default:
break;
}
nextFrame[y * this.width + x] = type;
}
}
this.cells = nextFrame;
},
reset: function() {
for(var i = 0; i < this.cells.length; i++) {
this.cells[i] = CELL_EMPTY;
}
}
};
function Player(grid) {
this.world = grid;
this.cellType = CELL_CONDUCTOR;
}
Player.prototype = {
isMouseDown: false,
mousedown: function(event) {
if (event.which != 1)
return true;
this.isMouseDown = true;
var pos = relMouseCoords(event);
var cellX = Math.floor(pos.x / (CELL_SIZE + 1));
var cellY = Math.floor(pos.y / (CELL_SIZE + 1));
this.world.setCell(cellX, cellY, this.cellType);
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
return false;
},
mouseup: function(event) {
if (event.which != 1)
return true;
this.isMouseDown = false;
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
return false;
},
mousemove: function(event) {
if (!this.isMouseDown)
return true;
var pos = relMouseCoords(event);
var cellX = Math.floor(pos.x / (CELL_SIZE + 1));
var cellY = Math.floor(pos.y / (CELL_SIZE + 1));
this.world.setCell(cellX, cellY, this.cellType);
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
return false;
},
keypress: function(event) {
switch(event.which) {
case 119: // W
this.cellType = CELL_CONDUCTOR;
break;
case 113: // Q
this.cellType = CELL_EMPTY;
break;
case 101: // E
this.cellType = CELL_WIREHEAD;
break;
case 114: // R
this.cellType = CELL_WIRETAIL;
default:
break;
}
}
};
// Relative mouse input from <http://stackoverflow.com/a/5932203>
function relMouseCoords(event){
var totalOffsetX = 0;
var totalOffsetY = 0;
var canvasX = 0;
var canvasY = 0;
var currentElement = $('#game')[0];
do {
totalOffsetX += currentElement.offsetLeft;
totalOffsetY += currentElement.offsetTop;
}
while(currentElement = currentElement.offsetParent)
canvasX = event.pageX - totalOffsetX;
canvasY = event.pageY - totalOffsetY;
return {x:canvasX, y:canvasY};
}
function startRun() {
timer = setInterval(function() { grid.runStep(); }, 500);
$('#run').html('Stop');
}
function stopRun() {
clearInterval(timer);
timer = null;
$('#run').html('Run');
}
var $document = $(document);
var context = $('#game')[0].getContext('2d');
var width = 16;
var height = 16;
var grid = new CellGrid(width, height);
var player = new Player(grid);
var timer = null;
$('#game')[0].width = width * (CELL_SIZE + 1) + 1;
$('#game')[0].height = height * (CELL_SIZE + 1) + 1;
// Event bindings
$('#game').mousedown(function(event) { return player.mousedown(event); });
$('#game').mouseup(function(event) { return player.mouseup(event); });
$('#game').mousemove(function(event) { return player.mousemove(event); });
$document.keypress(function(event) { player.keypress(event); });
$('#runStep').click(function() { grid.runStep(); });
$('#reset').click(function() { grid.reset(); stopRun(); });
$('#run').click(function() { if (timer) stopRun(); else startRun(); });
// Rendering
setInterval(function() { grid.draw(context); }, 1000/10);