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o4oren/RotaryKnobView.kt

Created May 2, 2020 16:37
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Calcualate angle
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RotaryKnobView.kt
private fun calculateAngle(x: Float, y: Float): Float {
val px = (x / width.toFloat()) - 0.5
val py = ( 1 - y / height.toFloat()) - 0.5
var angle = -(Math.toDegrees(atan2(py, px)))
.toFloat() + 90
if (angle > 180) angle -= 360
return angle
}
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