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Decent Touch Detection for Android DPad

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This commit is contained in:
Florian Märkl 2019-09-28 18:04:50 +02:00
commit b007f93d16
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GPG key ID: 125BC8A5A6A1E857
2 changed files with 69 additions and 11 deletions
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76
android/app/src/main/java/com/metallic/chiaki/touchcontrols/DPadView.kt
View file

@ -26,6 +26,7 @@ import android.view.View
import androidx.vectordrawable.graphics.drawable.VectorDrawableCompat
import com.metallic.chiaki.R
import kotlin.math.abs
import kotlin.math.sqrt
class DPadView @JvmOverloads constructor(
context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
@ -36,9 +37,17 @@ class DPadView @JvmOverloads constructor(
var state: Direction? = null
private set
/**
* Radius (as a fraction of the entire DPad Radius)
* to be used as a deadzone in the center on move events
*/
private val deadzoneRadius = 0.3f
private val dpadIdleDrawable = VectorDrawableCompat.create(resources, R.drawable.control_dpad_idle, null)
private val dpadLeftDrawable = VectorDrawableCompat.create(resources, R.drawable.control_dpad_left, null)
private var pointerId: Int? = null
override fun onDraw(canvas: Canvas)
{
super.onDraw(canvas)
@ -64,7 +73,7 @@ class DPadView @JvmOverloads constructor(
drawable?.draw(canvas)
}
fun directionForPosition(x: Float, y: Float): Direction
private fun directionForPosition(x: Float, y: Float): Direction
{
val dx = x - width * 0.5f
val dy = y - height * 0.5f
@ -72,19 +81,68 @@ class DPadView @JvmOverloads constructor(
{
dx > abs(dy) -> Direction.RIGHT
dx <= -abs(dy) -> Direction.LEFT
dy > abs(dx) -> Direction.DOWN
else /*dy <= -abs(dx)*/ -> Direction.UP
dy >= abs(dx) -> Direction.DOWN
else /*dy < -abs(dx)*/ -> Direction.UP
}
}
private fun updateState(x: Float?, y: Float?)
{
val newState =
if(x == null || y == null)
null
else
{
val xFrac = 2.0f * (x / width.toFloat() - 0.5f)
val yFrac = 2.0f * (y / height.toFloat() - 0.5f)
val radiusSq = xFrac * xFrac + yFrac * yFrac
if(radiusSq < deadzoneRadius * deadzoneRadius && state != null)
state
else
directionForPosition(x, y)
}
if(state != newState)
{
state = newState
invalidate()
// TODO: callback
}
}
override fun onTouchEvent(event: MotionEvent): Boolean
{
val dir = directionForPosition(event.x, event.y)
if(event.action == MotionEvent.ACTION_UP)
state = null
else if(event.action == MotionEvent.ACTION_DOWN)
state = dir
invalidate()
when(event.actionMasked)
{
MotionEvent.ACTION_DOWN, MotionEvent.ACTION_POINTER_DOWN ->
{
if(pointerId == null)
{
pointerId = event.getPointerId(event.actionIndex)
updateState(event.x, event.y)
}
}
MotionEvent.ACTION_UP, MotionEvent.ACTION_POINTER_UP ->
{
if(event.getPointerId(event.actionIndex) == pointerId)
{
pointerId = null
updateState(null, null)
}
}
MotionEvent.ACTION_MOVE ->
{
val pointerId = pointerId
if(pointerId != null)
{
val pointerIndex = event.findPointerIndex(pointerId)
if(pointerIndex >= 0)
updateState(event.getX(pointerIndex), event.getY(pointerIndex))
}
}
}
return true
}

4
android/app/src/main/res/layout/activity_main.xml
View file

@ -52,8 +52,8 @@
app:layout_constraintTop_toBottomOf="@+id/morningEditText" />
<com.metallic.chiaki.touchcontrols.DPadView
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_marginTop="32dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"