Using GDI + GraphicsPath.AddArc problem

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Hi,

I have a question about using "GraphicsPath.AddArc".

There is no problem to draw an arc when bound rectangle is not rotated.

Path.AddArc( Center.getX(), Center.getY(), Radius, Radius, startAngle, sweepAngle );

But when the rectangle is rotated with an angle, the arc will be wrong.

How can I correctly using it?

Thanks,

Posted 22-Dec-10 22:20pm

transoft

Updated 22-Dec-10 22:34pm

v3

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Tefik Becirovic · Answer 1 · 2011-01-06T02:44:00

They do not need to worry about a rotation because all transformation will be added after the path creating:

// Create a RoundedRectangle:
GraphicsPath path = RoundedRectangle.Create(20, 20, 100, 100, 15);

// Draw the created RoundedRectangle:
e.Graphics.FillPath(Brushes.Blue, path);

// Rotate it clockwise 45 degrees about its center:
Matrix matrix = new Matrix();
matrix.RotateAt(45, new Point(70,70));
path.Transform(matrix);

// Draw the rotated RoundedRectangle:
e.Graphics.FillPath(Brushes.Blue, path);