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Index › Programming Questions & Help › Syntax Questions › Ecplise processing - class structure problem.
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Ecplise processing - class structure problem. (Read 498 times)
Rackdoll
Ecplise processing - class structure problem.
May 25th, 2009, 2:47am  
Hi guys,
I have just started to build processing in Eclipse but i have some problems implementing different classes.

I make 1 main class and tried to make some other classes that i want to control from the main class, but somehow i keep getting the same error:

Exception in thread "Animation Thread" java.lang.NullPointerException
     at processing.core.PApplet.fill(PApplet.java:7704)
     at nl.rackdoll.CircleTest.draw(CircleTest.java:9)
     at nl.rackdoll.CircleBuilder.draw(CircleBuilder.java:20)
     at processing.core.PApplet.handleDraw(PApplet.java:1423)
     at processing.core.PApplet.run(PApplet.java:1328)
     at java.lang.Thread.run(Unknown Source)


So i made a package( nl.rackdoll ), in that there is my main class, nect to that i have a class that is in same package only one lvl deeper ( nl.rackdoll.test ) . I want to make an instance of that class in my main class and then controll it, but it somehow giefs me that error...

Does anyone know what i am doing wrong ?
Both classes extend PApplet and both classes import the Processing.core. *;

Maybe someone got a demo project for me so i can see how structures work in processing ecplise ?

thnx in advance!
Rackdoll..
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PhiLho 
Re: Ecplise processing - class structure problem.
Reply #1 - May 25th, 2009, 3:18am  
Rackdoll wrote on May 25th, 2009, 2:47am:
Both classes extend PApplet

I believe that's the core of your problem, from what I have read, you can have only one class extending PApplet per project (the main class).
Have you read Processing in Eclipse article It might answer some of your questions.
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Rackdoll
Re: Ecplise processing - class structure problem.
Reply #2 - May 25th, 2009, 3:40am  
Ahh yesh, thnx!
Did jump right to another tut  so i missed the bottom part...
Thnx for mentioning it! appreciate the fast responds!

Grin
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