add subprojects

1 files changed, 32 insertions, 0 deletions

diff --git a/centipede/js/game/input.js b/centipede/js/game/input.js
new file mode 100644
index 0000000..6ceff13
--- /dev/null
+++ b/centipede/js/game/input.js
@@ -0,0 +1,32 @@
+game.input = (() => {
+  "use strict";
+  const Keyboard = () => {
+    const keys = {};
+    const handlers = {};
+    const keyPress = (event) => {
+      keys[event.key] = event.timeStamp;
+    };
+    const keyRelease = (event) => {
+      delete keys[event.key];
+    };
+    const registerCommand = (key, handler) => {
+      handlers[key] = handler;
+    };
+    const unregisterCommand = (key) => {
+      delete handlers[key];
+    }
+    const update = (elapsedTime) => {
+      for (let key in keys) {
+        if (keys.hasOwnProperty(key)) {
+          if (handlers[key]) {
+            handlers[key](elapsedTime);
+          }
+        }
+      }
+    };
+    window.addEventListener("keydown", keyPress);
+    window.addEventListener("keyup", keyRelease);
+    return {keys, handlers, registerCommand, unregisterCommand, update};
+  }
+  return { Keyboard };
+})();
\ No newline at end of file