The Graphics Class in .NET framework

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3 The Graphics Class
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Graphics objects are the heart of GDI+ They are represented by the Graphics class, which defines methods and properties to draw and fill graphics objects Whenever an application needs to draw or paint something, it has to use the Graphics object Hence, understanding the Graphics class, its methods, and its properties is very important We will use Graphics methods and properties in all the chapters that follow Specifically, in this chapter we will discuss the methods and properties of the Graphics class, and how to use them in real-world applications, including line charts, pie charts, and our GDI+Painter application GDI+Painter is similar to the PaintBrush application, which allows you to draw simple graphics objects such as lines, rectangles, and circles and save the images as bitmaps
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31 Graphics Class Properties
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The Graphics class provides a long list of properties (seeTable 31) and methods We will discuss and use these properties and methods in this and following chapters
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Table 31 Graphics properties
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Property Clip ClipBounds CompositingMode Description Gets and sets a Region type that limits the drawing region of theGraphics object Returns a RectangleF structure that bounds the clipping region of thisGraphics object Supports read-only access Returns a value of type CompositingMode enumeration representing how composite images are drawn to the Graphics object CompositingQuality Gets and sets the rendering quality (directly proportional to the visual quality of the output and inversely proportional to the rendering time) of composite images, represented by the CompositingQuality enumeration DpiX DpiY InterpolationMode Returns the horizontal resolution (dots per inch) of aGraphics object Returns the vertical resolution (dots per inch) of aGraphics object Gets and sets the interpolation mode (which determines intermediate values between two endpoints), represented by the InterpolationMode enumerator Returns a value indicating whether the clipping region of a Graphics object is empty When there is no clipping, this property returns false IsVisibleClipEmpty PageScale PageUnit PixelOffsetMode RenderingOrigin SmoothingMode Returns a value indicating whether the visible clipping region of a Graphics object is empty Gets and sets a value for scaling between world units and page units for this Graphics object Gets and sets a value that represents the unit of measure for page coordinates Gets and sets a value for the pixel offset mode PixelOffsetMode enumeration) ( Represents the rendering origin of a Graphics object for dithering and hatch brushes Gets and sets the smoothing mode of a Graphics object (SmoothingMode enumeration) Does not affect text Smoothing modes include high quality, high speed, and anti-aliasing TextContrast Gets and sets the gamma correction value for rendering anti-aliased and ClearType text values, ranging from 0 to 12 The default is 4 Gets and sets the text rendering quality (TextRenderingHint enumeration) Affects only text drawn on the Graphics object Transform Gets and sets the world transformation matrix (transformation is the process of converting graphics objects from one state to another) The transformation state is represented by a transformation matrix
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IsClipEmpty
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Property VisibleClipBounds
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Description Gets and sets the visible clipping region of the Graphics object (the intersection of the clipping region of theGraphics object and the clipping region of the window)
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32 Graphics Class Methods
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We can divide Graphics class methods into three categories: draw, fill, and miscellaneous Draw methods are used to draw lines, curves, and outer boundaries of closed curves and images Fill methods fill the interior area of graphics objects There are also a few miscellaneous methods that fall in neither category for example, MeasureString and Clear
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