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2048/js/html_actuator.js

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JavaScript
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function HTMLActuator() {
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this.tileContainer = document.getElementsByClassName("tile-container")[0];
this.scoreContainer = document.getElementsByClassName("score-container")[0];
this.messageContainer = document.getElementsByClassName("game-message")[0];
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this.score = 0;
}
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HTMLActuator.prototype.actuate = function (grid, metadata) {
var self = this;
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window.requestAnimationFrame(function () {
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self.clearContainer(self.tileContainer);
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grid.cells.forEach(function (column) {
column.forEach(function (cell) {
if (cell) {
self.addTile(cell);
}
});
});
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self.updateScore(metadata.score);
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if (metadata.over) self.message(false); // You lose
if (metadata.won) self.message(true); // You win!
});
};
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HTMLActuator.prototype.restart = function () {
this.clearMessage();
};
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HTMLActuator.prototype.clearContainer = function (container) {
while (container.firstChild) {
container.removeChild(container.firstChild);
}
};
HTMLActuator.prototype.addTile = function (tile) {
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var self = this;
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var element = document.createElement("div");
var position = tile.previousPosition || { x: tile.x, y: tile.y };
positionClass = this.positionClass(position);
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element.classList.add("tile", "tile-" + tile.value, positionClass);
element.textContent = tile.value;
this.tileContainer.appendChild(element);
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if (tile.previousPosition) {
window.requestAnimationFrame(function () {
element.classList.remove(element.classList[2]);
element.classList.add(self.positionClass({ x: tile.x, y: tile.y }));
});
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} else if (tile.mergedFrom) {
element.classList.add("tile-merged");
tile.mergedFrom.forEach(function (merged) {
self.addTile(merged);
});
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} else {
element.classList.add("tile-new");
}
};
HTMLActuator.prototype.normalizePosition = function (position) {
return { x: position.x + 1, y: position.y + 1 };
};
HTMLActuator.prototype.positionClass = function (position) {
position = this.normalizePosition(position);
return "tile-position-" + position.x + "-" + position.y;
};
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HTMLActuator.prototype.updateScore = function (score) {
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this.clearContainer(this.scoreContainer);
var difference = score - this.score;
this.score = score;
this.scoreContainer.textContent = this.score;
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if (difference > 0) {
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var addition = document.createElement("div");
addition.classList.add("score-addition");
addition.textContent = "+" + difference;
this.scoreContainer.appendChild(addition);
}
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};
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HTMLActuator.prototype.message = function (won) {
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if (ga) ga("send", "event", "game", "end", type, this.score);
var type = won ? "game-won" : "game-over";
var message = won ? "You win!" : "Game over!"
this.messageContainer.classList.add(type);
this.messageContainer.getElementsByTagName("p")[0].textContent = message;
};
HTMLActuator.prototype.clearMessage = function () {
this.messageContainer.classList.remove("game-won", "game-over");
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};