By Nick Symmonds
GDI+ either wraps arcane API calls and extends them for a lot more uncomplicated use. Programmers not need to make do with the prevalent yet simplistic VB 6.0 drawing version, nor have they got to dig down into the GDI API with the intention to get any genuine paintings performed. In GDI+, Microsoft has get a hold of a whole, yet nonetheless extensible, set of sessions for the entire .NET programmer's drawing needs.GDI+ calls for varied thoughts than the home windows GDI API, because it is totally stateless. GDI+ Programming in C# and VB .NET starts off out with a proof of GDI+ and the way it pertains to GDI. The e-book then dives deep into the GDI+ namespaces and periods. The ebook starts off with simple drawing within the early chapters after which explains in an comprehensible demeanour extra complicated drawing strategies, together with paths, gradients, alpha blends, matrix operations, and transformations.Later chapters hide the right way to paintings with bitmaps and different pictures, in addition to complex drawing and printing concepts. the ultimate chapters are dedicated to beneficial tasks that express the subject material of the former chapters in real-world examples.Throughout GDI+ Programming in C# and VB .NET, writer Nick Symmonds not just explains the various namespaces and periods when it comes to GDI+, but in addition takes the time to hide the simplest practices of portraits programming. Woven through the publication are quite a few examples that tie jointly various facets of programming in .NET that educate programmers the way to get the absolute best velocity and potency out in their code.
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Extra resources for GDI+ Programming in C# and VB.Net
It is interesting to see how C# and VB accomplish the same thing. Your Solution Explorer should have one form and one class. It should look like Figure 5-8. Figure 5-8. vb. Bring up the Centroid class and enter the code shown in Listing 5-7a. This class is a wrapper for a circle that will act as the centroid for a much larger circle. fm Page 216 Sunday, May 19, 2002 4:54 PM Chapter 5 Listing 5-7a. Y Return (True) End If End If Return (False) End Function #End Region End Class This class has two overloaded constructors.
Now run the program again and you should see just the small circle. Clamp and anything outside the gradient area is not shown. As you have no doubt surmised, the PathGradientBrush is used to fill objects from the center on out. The PathGradientBrush has enough intelligence to figure out the centroid of a path. After all, not everything is a rectangle or an ellipse. Some paths can be quite complex indeed. 4 Let’s look at some more detail regarding the PathGradientBrush. For one thing, it needs more setup than can be provided by constructor arguments.
Try running the program and playing with the scroll bars and antiflicker button. Pretty cool stuff. You will see that the top right-hand ellipse has an alpha component to it and is drawn as a transparent image on top of the color bars’ picture. Figure 5-6 shows this screen with the blend scroll bar to the right and the skew as vertical. The blend repeat pattern is much longer. 3. 208 I encourage you to enter as much as you can. You will learn so much more from making mistakes than not trying. fm Page 209 Sunday, May 19, 2002 4:54 PM Advanced Graphics Figure 5-5.
GDI+ Programming in C# and VB.Net by Nick Symmonds