snapchat_ml_android_draw_cigarette.kt

/**
* Draw cigarette at the left mouth
*/
private fun drawCigarette(canvas: Canvas, face: FirebaseVisionFace) {
   val rightMouth = face.getLandmark(FirebaseVisionFaceLandmark.RIGHT_MOUTH)
   val leftMouth = face.getLandmark(FirebaseVisionFaceLandmark.LEFT_MOUTH)

   if (leftMouth != null && rightMouth != null) {
       val mouthLength = ((leftMouth.position.x - rightMouth.position.x) * widthScaleFactor).toInt()
       val cigaretteRect = Rect(
               translateX(leftMouth.position.x).toInt() - mouthLength,
               translateY(leftMouth.position.y).toInt(),
               translateX(leftMouth.position.x).toInt(),
               translateY(leftMouth.position.y).toInt() + mouthLength
       )

       canvas.drawBitmap(cigaretteBitmap, null, cigaretteRect, null)
   }
}