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Calling a function continuously

Posted on 1998-05-06
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Last Modified: 2010-04-06
I wrote a function that moves an object across a form and bounces off the edges.. (each time the function is called, the object moves 2 pixels in a specified direction, if that movement causes it to exceed the edge of the form, I change the direction and move away from the edge)

How do I keep calling this function as long as my Form exist.

I want the object to keep moving around until I change a variable (by pressing a button)... I also want to be able to do other operations on this form  (press other buttons...) without stopping the movement of my object?

Any ideas??
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Question by:rafy
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JimBob091197 earned 400 total points
ID: 1342523
Hi

There are several ways of doing this.  By far the quickest is to add a TTimer to your form (TTimer is on System tab on Delphi's component palette).  Set the TTimer's interval to number of milliseconds (e.g. 500 for half sec) and program the OnTimer event.  This shouldn't interfere with the rest of your program.

Another method is to create a thread to handle the movement of your object.  This would require more work, but if you want to investigate it, look up TThread in Delphi.

Cheers,
JB
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by:rafy
ID: 1342524
The timer works great as long as the other event is discrete like a button press, but it still stops (even the timer) when the event is something like onmousemove where I do something else as long as the mouse is located on my button.  This suspends the timer (and the bounce) until I move my mouse away from the button.

Oh well, Threads it is!
Thanks
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