Simple controlling system

1 files changed, 30 insertions, 0 deletions

diff --git a/src/systems/keyboardInput.js b/src/systems/keyboardInput.js
new file mode 100644
index 0000000..ff2211c
--- /dev/null
+++ b/src/systems/keyboardInput.js
@@ -0,0 +1,30 @@
+game.system.KeyboardInput = () => {
+  "use strict";
+  const keys = {};
+  const keyPress = (event) => {
+    if (!event.repeat) {
+      keys[event.key] = true;
+    }
+  };
+  const update = (elapsedTime, entities) => {
+    for (let id in entities) {
+      const entity = entities[id];
+      if (entity.hasComponent('controllable')) {
+        const controls = entity.components.controllable.controls;
+        if (controls.includes('left') && keys['ArrowLeft']) {
+          entity.addComponent(game.components.Momentum({ dx: -1, dy: 0 }));
+        } else if (controls.includes('right') && keys['ArrowRight']) {
+          entity.addComponent(game.components.Momentum({ dx: 1, dy: 0 }));
+        } else if (controls.includes('up') && keys['ArrowUp']) {
+          entity.addComponent(game.components.Momentum({ dx: 0, dy: -1 }));
+        } else if (controls.includes('down') && keys['ArrowDown']) {
+          entity.addComponent(game.components.Momentum({ dx: 0, dy: 1 }));
+        }
+
+        Object.keys(keys).map((key) => delete keys[key]);
+      }
+    }
+  };
+  window.addEventListener("keydown", keyPress);
+  return { keys, update };
+}
\ No newline at end of file