core/src/ru/deadsoftware/cavedroid/game/input/Joystick.kt

   1 package ru.deadsoftware.cavedroid.game.input
   2
   3 import com.badlogic.gdx.math.Vector2
   4 import com.badlogic.gdx.utils.TimeUtils
   5
   6 class Joystick(
   7     private val value: Float,
   8 ) {
   9
  10     var active = false
  11         private set
  12     var centerX = 0f
  13         private set
  14     var centerY = 0f
  15         private set
  16
  17     var activeX = 0f
  18         private set
  19     var activeY = 0f
  20         private set
  21
  22     var pointer = 0
  23         private set
  24
  25     private val stickVector = Vector2()
  26
  27     private var activateTimeMs = 0L
  28
  29     fun activate(touchX: Float, touchY: Float, pointer: Int) {
  30         active = true
  31         centerX = touchX
  32         centerY = touchY
  33         activateTimeMs = TimeUtils.millis()
  34         this.pointer = pointer
  35     }
  36
  37     fun deactivate() {
  38         active = false
  39     }
  40
  41     fun getVelocityVector(): Vector2 {
  42         if (!active) {
  43             return Vector2.Zero
  44         }
  45         return Vector2(
  46             stickVector.x * value,
  47             stickVector.y * value
  48         )
  49     }
  50
  51     fun updateState(touchX: Float, touchY: Float) {
  52         if (!active) {
  53             return
  54         }
  55
  56         stickVector.x = touchX - centerX
  57         stickVector.y = touchY - centerY
  58         stickVector.clamp(0f, RADIUS)
  59
  60         activeX = centerX + stickVector.x
  61         activeY = centerY + stickVector.y
  62
  63         stickVector.x /= RADIUS
  64         stickVector.y /= RADIUS
  65     }
  66
  67     companion object {
  68         const val RADIUS = 48f
  69         const val SIZE = RADIUS * 2
  70         const val STICK_SIZE = 32f
  71     }
  72
  73 }