void drawCenter(string text, float yMultiply)
{
var r = new android.graphics.Rect();
frameCanvas.getClipBounds(r);
paint.setTextAlign(android.graphics.Paint.Align.LEFT);
paint.getTextBounds(text, 0, text.Length, r);
float x = frameWidth / 2f - r.width() / 2f - r.left;
float y = frameHeight / 2f + (r.height() * yMultiply) / 2f - r.bottom;
frameCanvas.drawText(text, x, y, paint);
}