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Listing 210 Using the Round, Truncate , Union, Inflate, Ceiling, and Intersect methods of Rectangle
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// Create a Graphics object Graphics g = thisCreateGraphics(); // Create PointF, SizeF, and RectangleF objects PointF pt = new PointF(308f, 207f); SizeF sz = new SizeF(600f, 400f); RectangleF rect2 = new RectangleF(402f, 406f, 1005f, 1000f); RectangleF rect1 = new RectangleF(pt, sz); Rectangle rect3 = RectangleCeiling(rect1); Rectangle rect4 = RectangleTruncate(rect1); Rectangle rect5 = RectangleRound(rect2); // Draw rectangles gDrawRectangle(PensBlack, rect3); gDrawRectangle(PensRed, rect5); // Intersect rectangles Rectangle isectRect = RectangleIntersect(rect3, rect5); // Fill new rectangle gFillRectangle( new SolidBrush(ColorBlue), isectRect); // Create a Size object Size inflateSize = new Size(0, 40); // Inflate rectangle isectRectInflate(inflateSize); // Draw new rectangle gDrawRectangle(PensBlue, isectRect); // Set Rectangle properties rect4 = RectangleEmpty; rect4Location = new Point(50, 50); rect4X = 30; rect4Y = 40; // Union two rectangles Rectangle unionRect = RectangleUnion(rect4, rect5); // Draw new rectangle gDrawRectangle(PensGreen, unionRect); // Dispose of the Graphics object gDispose(); Figure 214 shows the output from Listing 210
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Figure 214 Using the Round, Truncate , Union, Inflate, Ceiling, and Intersect methods of Rectangle
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244 The Size and SizeF Structures
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The Size and SizeF structures represent the size of a rectangular area LikePoint/PointF and Rectangle/RectangleF, Size and SizeF also each have an Empty static field, which creates aSize object with zero height and zero width The only difference between Size and SizeF is that Size uses integer values and SizeF uses floating point values You can create Size and SizeF objects by passing the width and height of thePoint and PointF objects as constructor arguments, respectively Listing 211 shows different ways to create Size and SizeF objects
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Listing 211 Creating Size and SizeF objects
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Point pt1 = new Point(20, 40); PointF pt2 = new PointF(500f, 800f); Size sz1 = new Size(pt1); SizeF sz2 = new SizeF(pt2); Size sz3 = new Size(100, 150); SizeF sz4 = new SizeF(125f, 876f); The Height and Width properties represent the height and width, respectively, of the area represented by the Size and SizeF structures The IsEmpty property returns true if Size has zero height and zero width; otherwise it returnsfalse Like the Point/PointF and Rectangle/RectangleF structures, Size and SizeF have Ceiling, Truncate, and Round static methods Each method can convert a SizeF object to a Size object: the Ceiling method, by rounding the values of theSize structure to the next higher integer values; the Round method, by rounding the values of theSize structure to the nearest integer values; and theTruncate method, by truncating the values to the next lower integer values Listing 212 shows the use of the Ceiling, Round and Truncate methods You can test this code on a button or a menu click event handler
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Listing 212 Using the Ceiling, Round, and Truncate methods of Size and SizeF
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PointF pt1 = new PointF(306f, 308f); PointF pt2 = new PointF(503f, 607f); PointF pt3 = new PointF(1103f, 805f);
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks SizeF sz1 = new SizeF(pt1); SizeF sz2 = new SizeF(pt2); SizeF sz3 = new SizeF(pt3); Size sz4 = SizeCeiling(sz1); Size sz5 = SizeRound(sz2); Size sz6 = SizeTruncate(sz3);
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SUMMARY
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Before you write a graphics application, a basic understanding of drawing surfaces and coordinate systems is a must This chapter began with the basics of the drawing surfaces and the coordinate system, describing how drawing surfaces and coordinate systems are represented in GDI+ and how the GDI+ coordinate system differs from other coordinate systems Before using any GDI+-related classes defined in the NET Framework library, you must reference SystemDrawing and its subnamespaces In this chapter you learned how to add references to the GDI+ library and how to import the GDI+-related namespaces into your application After adding a reference to the GDI+ library and namespaces to the application, the next step is to get the Graphics object There are several ways to get a Graphics object in an application This chapter discussed three different ways, and then showed how to use the Graphics class methods to draw and fill lines, rectangles, and ellipses You also learned to dispose of objects when you're finished with them Finally, we covered some basic GDI+ structures including Color, Rectangle, RectangleF, Point, PointF, Size, and SizeF describing their members and how to use them in your applications You should now be able to write simple graphics applications using GDI+ 3 is all about the Graphics class and will demonstrate how quickly you can write real-world applications By the end of 3, you will be able to write your own 2D paint application similar to Microsoft's PaintBrush, using your newly acquired GDI+ skills
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