/// <summary>
/// Draw a box from a point at top left with radius width and radius length.
/// </summary>
public void DrawBox(IImageProcessingContext context, IEnumerable <PointOfInterest> pointsOfInterest, int radius)
{
foreach (PointOfInterest poi in pointsOfInterest)
{
var pen = new Pen(Color.Crimson, 1);
//graphics.DrawRectangle(pen, poi.Point.X, height - poi.Point.Y - 1, radius, radius);
context.DrawRectangle(pen, poi.Point.X, poi.Point.Y, radius, radius);
}
}