By Jason Bock
Win32 API calls from visible uncomplicated 6 - permitting the VB programmer to entry the strong repertoire of API calls to be had while programming in home windows.
Visual easy does a great task of letting builders construct refined home windows purposes in a comparatively brief period of time. this permits one to speedy construct prototypes for end-users to guage and attempt, that can speed up the advance cycle. despite the fact that, this ease of use does have its hazards. via defensive the programmer from the low-level Win32 calls, s/he is probably not in a position to optimize yes capabilities and/or practice a few projects that the clients have asked. except a programmer has all started his/her profession constructing home windows purposes in a decrease point language like C or Pascal, they're strange with the API calls that may be made to the OS. this may result in frustration or confusion in utilizing an API approach that could behave by surprise.
Currently, there exist a couple of references, either on the web and in revealed shape, that experience documented nearly the entire Win32 API calls that may be made. whereas so much of them do an advantageous activity in explaining what the calls do, there are rather few books that exhibit transparent, step by step examples that may be utilized to enterprise improvement. This booklet will tackle the newcomer to VB who's simply commencing to methods to code in the atmosphere, and provides them transparent causes to the Win32 calls inside of a venture application.
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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.
QBASIC tutorial by Jason Bock