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2048.js
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2048.js
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const DIRECTION_LEFT = 1;
const DIRECTION_UP = 2;
const DIRECTION_RIGHT = 3;
const DIRECTION_DOWN = 4;
class i2048 extends EventTarget {
/**
* @param {()=>number} rng
*/
constructor(rng) {
super();
this.rng = rng;
this.score = 0;
this._maxValue = 0;
this.running = new Promise((x)=>x());
}
_translate(dir) {
switch(dir) {
case DIRECTION_LEFT: return [1, 0, 0, 0, 0, 1];
case DIRECTION_UP: return [0, 1, 0, 0, 1, 0];
case DIRECTION_RIGHT: return [-1, 0, 3, 0, 0, 1];
case DIRECTION_DOWN: return [0, -1, 0, 3, 1, 0];
}
}
/** @returns {Promise<boolean>} */
move(dir) {
const [dirX, dirY, startX, startY, runX, runY] = this._translate(dir);
var result = false;
var scoreGain = 0;
for(var i = 0, aX = startX, aY = startY; i < 4; i++, aX += runX, aY += runY) {
var destX = aX, destY = aY;
var iX = aX + dirX, iY = aY + dirY;
for(var j = 0; j < 3; j++, iX += dirX, iY += dirY) {
const current = this._getValue(iX, iY);
if(current === 0) continue;
const dest = this._getValue(destX, destY);
if(dest === 0) {
this._tileMove(iX, iY, destX, destY);
result = true;
} else if(current === dest) {
this._tileMerge(iX, iY, destX, destY, current * 2);
scoreGain += current * 2;
destX += dirX;
destY += dirY;
result = true;
} else if(current.x == (destX + dirX) && current.y == (destY + dirY)) {
destX += dirX;
destY += dirY;
continue;
} else {
// move tile and ceret
destX += dirX;
destY += dirY;
if(iX != destX || iY != destY) {
this._tileMove(iX, iY, destX, destY);
result = true;
}
}
}
}
if(scoreGain > 0) {
this.score += scoreGain;
this.dispatchEvent(new Event('scorechange'));
}
return new Promise(function(resolve) {
resolve(result);
});
}
isValid(dir) {
// This is just simplified move function
const [dirX, dirY, startX, startY, runX, runY] = this._translate(dir);
for(var i = 0, aX = startX, aY = startY; i < 4; i++, aX += runX, aY += runY) {
var destX = aX, destY = aY;
var iX = aX + dirX, iY = aY + dirY;
for(var j = 0; j < 3; j++, iX += dirX, iY += dirY) {
const current = this._getValue(iX, iY);
if(current === 0) continue;
const dest = this._getValue(destX, destY);
if(dest === 0) {
return true;
} else if(current === dest) {
return true;
} else if(current.x == (destX + dirX) && current.y == (destY + dirY)) {
destX += dirX;
destY += dirY;
continue;
} else {
destX += dirX;
destY += dirY;
if(iX != destX || iY != destY) {
return true;
}
}
}
}
return false;
}
async start() {
this.running = Promise.all([
this.putRandomTile(),
this.putRandomTile()
]);
await this.running;
this.dispatchEvent(new Event('start'));
}
putRandomTile() {
var x, y;
do {
x = Math.floor(this.rng() * 4);
y = Math.floor(this.rng() * 4);
} while(this._getValue(x, y) !== 0);
const value = this.rng() < 0.1 ? 4 : 2;
return this._putTile(x, y, value);
}
check() {
for(var y = 0; y < 4; y++) {
for(var x = 0; x < 4; x++) {
if(this._getValue(x, y) == 0) {
return true;
}
}
}
for(var y = 0; y < 4; y++) {
for(var x = 0; x < 3; x++) {
const a = this._getValue(x, y);
const b = this._getValue(x + 1, y);
if(a === b) return true;
}
for(var x = 0; x < 3; x++) {
const a = this._getValue(y, x);
const b = this._getValue(y, x + 1);
if(a === b) return true;
}
}
return false;
}
_getValue(x, y) { return 0; }
_tileMove(srcX, srcY, dstX, dstY) {}
_tileMerge(srcX, srcY, dstX, dstY, newValue) {}
/** @abstract @returns {Promise<void>} */
_putTile(x, y, value) {}
}