1 files changed, 46 insertions, 0 deletions
diff --git a/src/main/kotlin/CameraController.kt b/src/main/kotlin/CameraController.kt
new file mode 100644
index 0000000..a3508c1
--- /dev/null
+++ b/src/main/kotlin/CameraController.kt
@@ -0,0 +1,46 @@
+import kotlinx.browser.document
+
+class CameraController(
+  private val camera: Camera,
+  private val moveSpeed: Double = 0.5,
+  private val rotateSpeed: Int = 5,
+  private val afterInput: () -> Unit
+) {
+
+  init {
+    document.onkeydown = { inputHandler(it.code) }
+  }
+
+  private fun inputHandler(code: String) {
+    when (code) {
+      "KeyW" -> moveForward()
+      "KeyS" -> moveBack()
+      "KeyA" -> rotateAntiClockwise()
+      "KeyD" -> rotateClockwise()
+    }
+    afterInput()
+  }
+
+  private fun moveForward() {
+    val cameraCos = camera.rotation.cosine() * moveSpeed
+    val cameraSin = camera.rotation.sine() * moveSpeed
+    camera.xPos += cameraCos
+    camera.yPos += cameraSin
+  }
+
+  private fun moveBack() {
+    val cameraCos = camera.rotation.cosine() * moveSpeed
+    val cameraSin = camera.rotation.sine() * moveSpeed
+    camera.xPos -= cameraCos
+    camera.yPos -= cameraSin
+  }
+
+  private fun rotateClockwise() {
+    camera.rotation += rotateSpeed
+  }
+
+  private fun rotateAntiClockwise() {
+    camera.rotation -= rotateSpeed
+  }
+
+}
+\ No newline at end of file