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Index › Programming Questions & Help › Syntax Questions › Question about classes
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Question about classes (Read 311 times)
DGS3
Question about classes
Jan 15th, 2009, 4:45pm  
Can classes have their own separate draw command?  Im trying to make a bunch of shapes that are going to fall and rotate at the same time, and the easiest way I can think of doing it is to have one class that rotates them.  Ive tried to use the Draw() command but it doesn't seem to work.  Would a while(true) loop work?  Thanks!!
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sw01
Re: Question about classes
Reply #1 - Jan 15th, 2009, 4:54pm  
Do you mean:

Code:

void setup(){
   DrawableClass drawableClass = new DrawableClass();
}
void draw(){

   drawableClass.draw();
   drawableClass.update();
}


class DrawableClass{
    int posY = 0;
    int rot = 0; 
    void draw(){
     pushMatrix();
     translate(0,posY);
     rotate(rot);
     //draw shape
     popMatrix();
    }
    void update(){
      posY++;
      rot += 0.01;
    }
}


?

Could you post an example of what you want to do?
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PhiLho 
Re: Question about classes
Reply #2 - Jan 15th, 2009, 5:31pm  
The answer to the first question is "yes".
But don't expect Processing to automagically call this draw() method in each class instance... You have to iterate over the objects and manually call the method.
You will find plenty of examples in the forum, for example in Lists' objects interaction mess. Note that lot of people call the method display() instead, probably to reduce confusion...
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DGS3
Re: Question about classes
Reply #3 - Jan 15th, 2009, 5:32pm  
That actually answered my question.  Thanks a  lot!
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