adding 502 error

games/space-invaders502/js/controls.js

@@ -0,0 +1,40 @@
+// Handle keyboard controls
+var keysDown = {};
+
+var KEY_UP =38, KEY_DOWN =40, KEY_LEFT =37, KEY_RIGHT =39;
+
+addEventListener("keydown", function (e) {
+	keysDown[e.keyCode] = true;
+}, false);
+
+addEventListener("keyup", function (e) {
+	delete keysDown[e.keyCode];
+}, false);
+
+addEventListener("mousemove", function(evt) {
+    hero.x = evt.pageX - 24 ;
+}, false);
+
+var lastShot = 0;
+var SHOT_DELAY = 1000;
+
+addEventListener("click", function(evt) {
+    if (!hero.dead) {
+      var now = new Date().getTime();
+      if (lastShot  +SHOT_DELAY < now  ) {
+        lastShot = now;
+        playerShots.push({x:evt.pageX, y: hero.y});
+      }
+    }
+}, false);
+
+
+//Called from update.js
+var controls = function(modifier){
+  if (KEY_LEFT in keysDown) { // Player holding left
+    hero.x -= hero.speed * modifier;
+  }
+  if (KEY_RIGHT in keysDown) { // Player holding right
+    hero.x += hero.speed * modifier;
+  }
+}