pnDispose(); brushDispose(); Listing 1315 shows the complete code of a form's paint event handler in Visual Studio .NET

Creator Code 128 in Visual Studio .NET pnDispose(); brushDispose(); Listing 1315 shows the complete code of a form's paint event handler
pnDispose(); brushDispose(); Listing 1315 shows the complete code of a form's paint event handler
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Listing 1315 Using system pens and brushes
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private void Form1_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { Graphics g = eGraphics; // AVOID /*SolidBrush brush = (SolidBrush)SystemBrushesFromSystemColor (SystemColorsActiveCaption); Pen pn = SystemPensFromSystemColor (SystemColorsControlDarkDark); */ SolidBrush brush = (SolidBrush)SystemBrushesActiveCaption; Pen pn = SystemPensControlDarkDark; gDrawLine(pn, 20, 20, 20, 100); gDrawLine(pn, 20, 20, 100, 20); gFillRectangle(brush, 30, 30, 50, 50);
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// DON'T // pnDispose(); // brushDispose(); } Figure 137 shows the output from Listing 1315 The lines and rectangle are drawn with system colors
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Figure 137 Using system pens and brushes
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1346 Avoid Automatic Scaling of Images
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Automatic scaling could result in performance degradation If possible, avoid automatic scaling The DrawImage method takes a Bitmap object and a rectangle with upper left corner position and specified width and height If we pass only the upper left corner position, GDI+ may scale the image, which decreases performance For example, the code
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eGraphicsDrawImage(image, 10, 10; can be replaced with the following code:
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eGraphicsDrawImage(image, 10, 10, imageWidth, imageHeight);
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SUMMARY
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Quality and performance are two basic requirements of all graphics applications Although an increase in one demands a sacrifice in the other, a good developer will employ good design and coding techniques to provide an optimal solution In this chapter we discussed some techniques that may be helpful in writing optimal solutions for graphics applications We learned about the paint event mechanism and different ways to fire the paint event automatically, as well as manually We also discussed double buffering, and how it can be achieved with or without the SetStyle method In addition, we learned a few good programming techniques and covered some topics that may help you implement some good, performance-oriented coding and design practices As a GDI developer, you may want to use some of the "cool" techniques of GDI that are not supported by GDI+ 14 is dedicated to GDI interoperability In it, we will discuss how you can mix GDI and GDI+ to take advantage of interoperability
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14 GDI Interoperability
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Although GDI+ is a vastly improved API, a few features that are appreciated by GDI developers are not available in GDI+, such as raster operations However, all is not lost GDI+ interoperability provides a way to interact with GDI in managed applications, which can be used alongside GDI+ to provide the best of both worlds This chapter is written particularly for developers who want to use GDI in their managed applications If you have no interest in GDI, feel free to skip this chapter It will always be here, should the GDI need arise!
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To Learn More about COM and NET Interoperability
If you know GDI and want to use it in managed applications, this chapter will give you an idea of how to do that However, COM interoperability is a broad topic If you want to explore COM interoperability more, some good books are available on the market One such book is COM and NET Interoperability by Andrew Troelsen (published by APress)
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks
141 Using GDI in the Managed Environment
One important feature of the NET runtime is COM and Win32 interoperability With runtime interoperability services, developers can use both COM and Win32 libraries in managed applications The classes related to these services are defined in the SystemRuntimeInteropServices namespace We can use COM libraries in managed applications by simply adding a reference to the COM library using the Add Reference option of VSNET or the Type Library Importer (Tlbimpexe) NET tool Both of these options allow developers to convert a COM library to a NET assembly, which can then be treated as other NET assemblies The graphical user interface (GUI) functionality of Windows is defined in a Win32 library called Gdi32dll Using Win32 libraries in managed code is a little more difficult than using COM libraries However, there is nothing to worry about because the SystemRuntimeInteropServicesDllImportAttribute class allows developers to use functionality defined in unmanaged libraries such as Gdi32dll