| title | description | ms.date | dev_langs | helpviewer_keywords | ms.assetid | ||||||||
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Ellipses and Arcs in GDI+ |
Learn how to draw ellipses and arcs using the DrawEllipse and DrawArc methods in GDI+ with Windows Forms. |
03/30/2017 |
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34f35133-a835-4ca4-81f6-0dfedee8b683 |
You can easily draw ellipses and arcs using the xref:System.Drawing.Graphics.DrawEllipse%2A and xref:System.Drawing.Graphics.DrawArc%2A methods of the xref:System.Drawing.Graphics class.
To draw an ellipse, you need a xref:System.Drawing.Graphics object and a xref:System.Drawing.Pen object. The xref:System.Drawing.Graphics object provides the xref:System.Drawing.Graphics.DrawEllipse%2A method, and the xref:System.Drawing.Pen object stores attributes, such as width and color, of the line used to render the ellipse. The xref:System.Drawing.Pen object is passed as one of the arguments to the xref:System.Drawing.Graphics.DrawEllipse%2A method. The remaining arguments passed to the xref:System.Drawing.Graphics.DrawEllipse%2A method specify the bounding rectangle for the ellipse. The following illustration shows an ellipse along with its bounding rectangle.
The following example draws an ellipse; the bounding rectangle has a width of 80, a height of 40, and an upper-left corner of (100, 50):
[!code-csharpLinesCurvesAndShapes#51] [!code-vbLinesCurvesAndShapes#51]
xref:System.Drawing.Graphics.DrawEllipse%2A is an overloaded method of the xref:System.Drawing.Graphics class, so there are several ways you can supply it with arguments. For example, you can construct a xref:System.Drawing.Rectangle and pass the xref:System.Drawing.Rectangle to the xref:System.Drawing.Graphics.DrawEllipse%2A method as an argument:
[!code-csharpLinesCurvesAndShapes#52] [!code-vbLinesCurvesAndShapes#52]
An arc is a portion of an ellipse. To draw an arc, you call the xref:System.Drawing.Graphics.DrawArc%2A method of the xref:System.Drawing.Graphics class. The parameters of the xref:System.Drawing.Graphics.DrawArc%2A method are the same as the parameters of the xref:System.Drawing.Graphics.DrawEllipse%2A method, except that xref:System.Drawing.Graphics.DrawArc%2A requires a starting angle and sweep angle. The following example draws an arc with a starting angle of 30 degrees and a sweep angle of 180 degrees:
[!code-csharpLinesCurvesAndShapes#53] [!code-vbLinesCurvesAndShapes#53]
The following illustration shows the arc, the ellipse, and the bounding rectangle.
- xref:System.Drawing.Graphics?displayProperty=nameWithType
- xref:System.Drawing.Pen?displayProperty=nameWithType
- Lines, Curves, and Shapes
- How to: Create Graphics Objects for Drawing
- How to: Create a Pen
- How to: Draw an Outlined Shape