Add input handling

main/Game.js

@@ -25,6 +25,8 @@ Game = (function() {
 	function gameLoop() {
 		requestAnimationFrame(gameLoop);
 		
+		Input.refresh();
+		
 		flipScenes();
 		currentScene.ticCount++;
 		currentScene.think();

main/Input.js

@@ -0,0 +1,75 @@
+Input = (function() {
+	var Input = {};
+	
+	var keys = {};
+	
+	var frameThis = {};
+	var frameLast = {}; 
+	
+	var usedKeys = {};
+	
+	Input.controls = {
+		up: 87, // W
+		down: 83, // S
+		left: 65, // A
+		right: 68, // D
+		
+		dash: 13, // Enter
+		
+		accept: 13, // Enter
+		cancel: 8, // Backspace
+	};
+	
+	Input.setControl = function(control, key) {
+		Input.controls[control] = key;
+		
+		updateControls();
+	}
+	
+	updateControls();
+	
+	function updateControls() {
+		usedKeys = {};
+		
+		for (idx in Input.controls) {
+			if (Input.controls.hasOwnProperty(idx)) {
+				usedKeys[Input.controls[idx]] = true;
+			}
+		}
+	}
+	
+	window.addEventListener("keydown", function(event) {
+		if (usedKeys[event.keyCode]) {
+			event.preventDefault();
+			keys[event.keyCode] = true;
+		}
+	});
+	
+	window.addEventListener("keyup", function(event) {
+		if (usedKeys[event.keyCode]) {
+			event.preventDefault();
+			keys[event.keyCode] = false;
+		}
+	});
+	
+	Input.refresh = function() {
+		for (idx in Input.controls) {
+			frameLast[idx] = frameThis[idx];
+			frameThis[idx] = keys[Input.controls[idx]];
+		}
+	}
+	
+	Input.held = function(control) {
+		return frameThis[control];
+	}
+	
+	Input.pressed = function(control) {
+		return frameThis[control] && !frameLast[control];
+	}
+	
+	Input.released = function(control) {
+		return !frameThis[control] && frameLast[control];
+	}
+	
+	return Input;
+})();