The source Leadtools.RasterImage.
This allows you to create an infinite number of drawing capabilities such as paint, erase, color erase and brush, pen, spray gun, flood fill, color tube, text overlay, curve, line, rectangle, polygon, ellipse, freehand shapes, cut and paste, and more to use on the surface of this Leadtools.RasterImage.
For more information refer to RasterImage and GDI/GDI+.
For an example, refer to RasterImageGdiPlusGraphicsContainer.
Medical Web Viewer .NET