o4oren

class RotaryKnobView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : RelativeLayout(context, attrs, defStyleAttr), GestureDetector.OnGestureListener {

}

o4oren

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="RotaryKnobView">
        <attr name="minValue" format="integer" />
        <attr name="maxValue" format="integer" />
        <attr name="initialValue" format="integer" />
        <attr name="knobDrawable" format="reference" />
    </declare-styleable>
</resources>

o4oren

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/knobImageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

o4oren

    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
    }

o4oren

{
  "serverBaseUri": "http://localhost:3000",
  "mongoConnectUrl": "mongodb://localhost:27017/",
  "dbName": "ahem",
  "appListenPort": 3000,
  "smtpPort" : 2525,
  "emailDeleteInterval" : 3600,
  "emailDeleteAge" : 86400,
  "allowAutocomplete" : true,
  "allowedDomains" : ["my.domain.com"],