protected override void OnPaint(PaintEventArgs args)
{
base.OnPaint(args);
Graphics graph = args.Graphics;
// in vc, there is PrepareDC in which I can set MapMode for CDC object, we don't have to Setup CDC object in OnPaint()
// todo: find an alternative PrepareDC in C#.
GraphicsMapper.InitGraphics(graph);
Point pt = GraphicsMapper.Instance.TransformPoint(AutoScrollPosition);
graph.TranslateTransform(pt.X, pt.Y);
PrePaint(args);
// paint each drawingTool.
DrawingTools.All(tool =>
{
tool.Paint(args);
return(true);
});
}
public Image GetDraggingImage(int width, int height)
{
Bitmap img = null;
Size size = GraphicsMapper.Instance.TransformSize(new Size(width, height), CoordinateSpace.Device, CoordinateSpace.Page);
using (Bitmap tmpImage = new Bitmap(size.Width, size.Height))
{
using (Graphics graph = Graphics.FromImage(tmpImage))
{
GraphicsMapper.InitGraphics(graph);
OnPaint(new PaintEventArgs(graph, Rectangle.Empty));
}
size = GraphicsMapper.Instance.TransformSize(SurroundingRect.Size, CoordinateSpace.Device, CoordinateSpace.Page);
img = new Bitmap(size.Width + 1, size.Height + 1);
using (Graphics graph = Graphics.FromImage(img))
{
Rectangle rect = GraphicsMapper.Instance.TransformRectangle(SurroundingRect, CoordinateSpace.Device, CoordinateSpace.Page);
graph.DrawImage(tmpImage, 0, 0, rect, GraphicsUnit.Pixel);
}
}
return(img);
}
