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 Tutorials » 3D
The Zoom Let's work out the zoom. We really don't have very much to do, since most of it has alreday been done. Each time the main loop is looped it adds a certain value to the zoom (or substracts). When you roll over the zoom buttons, they change the value added from 0 to a positive or negative value (zoom in or out). When you roll out they reset it to 0. First open the start frame(n°2) and add this code just after the setting of the xcenter and the ycenter. Set Variable: "zm" = "0"This initiates the zm variable, which indicates by how much the zoom should be changed. Now open the loop layer and add this: Call ("zoom")
Call ("draw")
That way the zoom routine is called every time the engine loops. The draw routine is also
called to refresh.
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3D Engine for Dummies
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