// Image preview panel Paint event
// Called from Form control
private void ImagePanel_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
ImagePanel.DrawPanelImage(g, (float)ImageScaleInput.Value);
foreach (var p in ClipPoints)
{
var pp = ImagePanel.ImageToPanel(p);
g.FillEllipse(Brushes.Red, pp.X - 4, pp.Y - 4, 8, 8);
}
}