Processing: PAppletClass causes loop, thus makes alpha dark

Question

I'm using processing, just for test purposes in a trainings program.

When I use fill(alpha) it becomes dark the more frames there are, since (I assume) Processing creates more and more of the shapes, overlapping everytime a bit more. After executing draw() it goes back to PApplet and then back to draw() again.

Can I tell Programming to only execute draw() once without inventing some weird bypass?

 public void draw(){

    int winkel=0;
    translate(300,300);
    fill(150, 15);

    for (int i =0;i<8;i++){

        rotate(radians(winkel));
       kreisschnitt(100,0,200,200,0, PI);
       winkel=winkel+45;
    }
}

public void kreisschnitt(int x, int y, int breite, int hoehe,float anfang, float ende){
    noStroke();

    arc(x,y,breite,hoehe,anfang,ende);

}

IDEA 2018.2 Java 8

Found it myself. draw() will loop the inside code until noLoop() is called or program is forced to stop. — pikkuez, Sep 23 '18 at 08:26

score 1 · Accepted Answer · answered Sep 23 '18 at 16:18

1

Yes, the draw() loop is called 60 times per second by default.

You can disable this by calling noLoop() which stops calling draw() until you call loop() again.

Or you could move all of your code inside the setup() function, which is only called once.

For simple sketches, you can get rid of all of your functions and write your code directly, like this:

size(500, 500);
background(32);
ellipse(250, 250, 100, 100);

answered Sep 23 '18 at 16:18

Kevin Workman

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@pikkuez You're welcome. Note that if an answer helped you, you can [accept it](https://stackoverflow.com/help/someone-answers) so your question stops showing up as needing an answer. – Kevin Workman Sep 24 '18 at 17:23

Processing: PAppletClass causes loop, thus makes alpha dark

1 Answers1