Andy De George
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title, ms.date, helpviewer_keywords, ms.assetid
| title | ms.date | helpviewer_keywords | ms.assetid | ||
|---|---|---|---|---|---|
| Structure of the Graphics Interface | 03/30/2017 |
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010a1e46-656b-40a1-8d5d-87aa05ee1243 |
Structure of the Graphics Interface
The managed class interface to GDI+ contains about 60 classes, 50 enumerations, and 8 structures. The xref:System.Drawing.Graphics class is at the core of GDI+ functionality; it is the class that actually draws lines, curves, figures, images, and text.
Important Classes
Many classes work together with the xref:System.Drawing.Graphics class. For example, the xref:System.Drawing.Graphics.DrawLine%2A method receives a xref:System.Drawing.Pen object, which holds attributes (color, width, dash style, and the like) of the line to be drawn. The xref:System.Drawing.Graphics.FillRectangle%2A method can receive a pointer to a xref:System.Drawing.Drawing2D.LinearGradientBrush object, which works with the xref:System.Drawing.Graphics object to fill a rectangle with a gradually changing color. xref:System.Drawing.Font and xref:System.Drawing.StringFormat objects influence the way a xref:System.Drawing.Graphics object draws text. A xref:System.Drawing.Drawing2D.Matrix object stores and manipulates the world transformation of a xref:System.Drawing.Graphics object, which is used to rotate, scale, and flip images.
GDI+ provides several structures (for example, xref:System.Drawing.Rectangle, xref:System.Drawing.Point, and xref:System.Drawing.Size) for organizing graphics data. Also, certain classes serve primarily as structured data types. For example, the xref:System.Drawing.Imaging.BitmapData class is a helper for the xref:System.Drawing.Bitmap class, and the xref:System.Drawing.Drawing2D.PathData class is a helper for the xref:System.Drawing.Drawing2D.GraphicsPath class.
GDI+ defines several enumerations, which are collections of related constants. For example, the xref:System.Drawing.Drawing2D.LineJoin enumeration contains the elements xref:System.Drawing.Drawing2D.LineJoin.Bevel, xref:System.Drawing.Drawing2D.LineJoin.Miter, and xref:System.Drawing.Drawing2D.LineJoin.Round, which specify styles that can be used to join two lines.