private void Stage_MouseMove(object sender, MouseEventArgs e)
{
if (buttonCover.Checked || buttonCrop.Checked) {
this.previewRect = GetInvertedRectangle(this.previewStart.X, this.previewStart.Y, e.X - this.previewStart.X, e.Y - this.previewStart.Y);
}
if (buttonDraw.Checked) {
this.drawLines.Add(new Point(e.X, e.Y));
}
}