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import kotlinx.browser.document
import org.w3c.dom.HTMLButtonElement
class CameraController(
private val camera: Camera,
private val moveSpeed: Double,
private val rotateSpeed: Int,
private val xMax: Int,
private val yMax: Int,
private val afterInput: () -> Unit
) {
init {
document.onkeydown = { keyHandler(it.code) }
(document.getElementById("up") as HTMLButtonElement).onclick = { moveForward() }
(document.getElementById("down") as HTMLButtonElement).onclick = { moveBack() }
(document.getElementById("left") as HTMLButtonElement).onclick = { rotateAntiClockwise() }
(document.getElementById("right") as HTMLButtonElement).onclick = { rotateClockwise() }
}
private fun keyHandler(code: String) {
when (code) {
"KeyW" -> moveForward()
"KeyS" -> moveBack()
"KeyA" -> rotateAntiClockwise()
"KeyD" -> rotateClockwise()
}
}
private fun moveForward() {
val cameraCos = camera.rotation.cosine() * moveSpeed
val cameraSin = camera.rotation.sine() * moveSpeed
camera.xPos += cameraCos
camera.yPos += cameraSin
boundsCheck(camera)
afterInput()
}
private fun moveBack() {
val cameraCos = camera.rotation.cosine() * moveSpeed
val cameraSin = camera.rotation.sine() * moveSpeed
camera.xPos -= cameraCos
camera.yPos -= cameraSin
boundsCheck(camera)
afterInput()
}
private fun rotateClockwise() {
camera.rotation += rotateSpeed
afterInput()
}
private fun rotateAntiClockwise() {
camera.rotation -= rotateSpeed
afterInput()
}
private fun boundsCheck(camera: Camera) {
camera.xPos = clamp(camera.xPos, xMax)
camera.yPos = clamp(camera.yPos, yMax)
}
private fun clamp(position: Double, max: Int): Double {
return when {
position < 1 -> 1.0
position > max -> max.toDouble()
else -> position
}
}
}
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