[RESOLVED] Opposite region

Hiya

Ive painted a circle inside a usercontrol, and derived graphicspath and a region from it. Now, i want the exact opposite of my current region. I want to use fillregion to fill whats outside the region. Ideas please?

Current code:

Code:

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                        Graphics gfx = this.CreateGraphics();
                        gfx.Clear(this.BackColor);
                        Pen myPen = new Pen(Color.Green);
                        gfx.SmoothingMode=SmoothingMode.HighQuality;
                        gfx.DrawEllipse(myPen,0,0,this.Width ,this.Height );

                        //gfx.DrawLine(myPen,this.Width,this.Height/2,0,this.Height/4);

                        GraphicsPath r = new GraphicsPath();
                        r.AddEllipse(0,0,this.Width,this.Height);
                        Region aa = new Region(r);
                       
                        SolidBrush myBrush = new SolidBrush(Color.Red);
 
                        gfx.FillRegion(myBrush,aa);

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Make use of the Region.Complement method. Create a Region for the entire area and a Region for the area you want to cut out, then pass the smaller Region to the larger Region's Complement method. The larger Region will then be the area of non-intersection of the two. This is all theoretical though, as I've never done it myself. I just went to the MSDN library and checked to see what members the Region class had and there it was.

Cool, works great!

Final code:

Code:

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                        Graphics gfx = this.CreateGraphics();
                        gfx.Clear(this.BackColor);
                        Pen myPen = new Pen(Color.Green);
                        gfx.DrawEllipse(myPen,0,0,this.Width ,this.Height );

                        //gfx.DrawLine(myPen,this.Width,this.Height/2,0,this.Height/4);

                        GraphicsPath r = new GraphicsPath();
                       
                        r.AddEllipse(0,0,this.Width,this.Height);
                        Region aa = new Region(r);
                       
                        SolidBrush myBrush = new SolidBrush(Color.Red);
 
                        gfx.DrawLine(myPen,this.Width,this.Height/2,0,this.Height/4);
                        Region bb = new Region();
                       

                        aa.Complement(bb);

                        gfx.FillRegion(myBrush,aa);

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