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| function Game() {
this.stones = [];
this.canvas = new Canvas();
this.init();
}
Game.prototype.init = function() {
var self = this;
this.createRandomStones();
this.draw();
this.getAroundStones();
this.eventHandler();
this.loop = setInterval(function() {
self.update();
self.draw();
}, 120);
};
Game.prototype.eventHandler = function() {
var self = this;
var snapshotButton = document.getElementById('snapshotButton'),
snapshotImageElement = document.getElementById('snapshotImageElement'),
canvas = document.getElementById('canvas');
snapshotButton.onclick = function(event) {
event.preventDefault();
if (snapshotButton.innerHTML == 'Snapshot') {
clearInterval(self.loop);
var dataUrl = canvas.toDataURL();
snapshotImageElement.src = dataUrl;
snapshotImageElement.style.display = 'inline';
canvas.style.display = 'none';
snapshotButton.innerHTML = 'Continue';
} else {
self.loop = setInterval(function() {
self.update();
self.draw();
}, 120);
canvas.style.display = 'inline';
snapshotImageElement.style.display = 'none';
snapshotButton.innerHTML = 'Snapshot';
}
};
};
Game.prototype.createRandomStones = function() {
for (var i = 0; i < 32; i++) {
for (var j = 0; j < 32; j++) {
var status = Math.random() < 0.2 ? true : false;
this.stones.push(new Stone({x: i, y: j}, status))
}
}
};
Game.prototype.draw = function() {
var self = this;
this.canvas.drawGrid("lightgrey", 20, 20);
this.stones.forEach(function(stone) {
if (stone.status === true) {
self.canvas.drawStone(stone);
}
});
};
Game.prototype.getAroundStones = function() {
var self = this;
this.stones.forEach(function(stone) {
stone.around.forEach(function(position) {
stone.aroundStones.push(self.stones[32*position.x + position.y]);
});
});
};
Game.prototype.update = function() {
var self = this;
this.stones.forEach(function(stone) {
stone.aroundStones.forEach(function(s) {
if (s.status === true) stone.aliveCount += 1;
});
if (stone.status === true) {
if (stone.aliveCount === 2 || stone.aliveCount === 3) {
stone.nextStatus = true;
} else {
stone.nextStatus = false;
}
} else {
if (stone.aliveCount === 3) stone.nextStatus = true;
else stone.nextStatus = false;
}
});
this.stones.forEach(function(stone) {
stone.status = stone.nextStatus;
stone.aliveCount = 0;
});
}
function Stone(position, status) {
this.x = position.x;
this.y = position.y;
this.status = status;
this.nextStatus = false;
this.aroundStones = [];
this.aliveCount = 0;
this.around = [];
this.getAround();
}
Stone.prototype.getAround = function() {
for (var i = this.x-1; i <= this.x+1; i++) {
for (var j = this.y-1; j <= this.y+1; j++) {
if (i == this.x && j == this.y) continue;
if (i < 0 || i >= 32) continue;
if (j < 0 || j >= 32) continue;
this.around.push({x: i, y: j});
}
}
};
function Canvas() {
this.canvas = document.getElementById('canvas');
this.context = canvas.getContext('2d');
}
Canvas.prototype.drawGrid = function(color, stepx, stepy) {
var canvas = this.canvas;
var ctx = this.context;
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.save();
ctx.strokeStyle = color;
ctx.lineWidth = 0.5;
for (var i = stepx + 0.5; i < ctx.canvas.width; i += stepx) {
ctx.beginPath();
ctx.moveTo(i, 0);
ctx.lineTo(i, ctx.canvas.height);
ctx.stroke();
ctx.closePath();
}
for (var i = stepy + 0.5; i < ctx.canvas.height; i += stepy) {
ctx.beginPath();
ctx.moveTo(0, i);
ctx.lineTo(ctx.canvas.width, i);
ctx.stroke();
ctx.closePath();
}
ctx.restore();
};
Canvas.prototype.drawStone = function(stone) {
var ctx = this.context;
var x = 20 * stone.x + 10;
var y = 20 * stone.y + 10;
ctx.fillStyle = 'orange';
ctx.beginPath();
ctx.arc(x, y, 9, 0, Math.PI*2, false);
ctx.closePath();
ctx.fill();
};
new Game();
|