I had some hours of work last night figuring out why this loop doesnt work the way i wanted it. And solved the problem with an "if loop". But i still dont get where the difference is and why "if" works but "for" doesnt. Just for the understanding, does anybody knows why this is?

This is just an example loop but it clearly shows the problem.

The following one produces an endless number of screenshots with the last step of the loop.
Code:

void setup(){
size(300,300);
}
void draw() {
  for(int i=1; i<=10; i++){
    background(255);
   fill(0);    
   ellipse(10*i,10*i,10,10);
 
    saveFrame("screenshot-####.png");
  }
}

 

The next one does what it should. It produces 10 shots and moves the ellipse between each shot and stops when its done

Code:

void setup(){
size(300,300);
}
int i=1;
void draw() {

  if(i<=10){
    background(255);
   fill(0);    
   ellipse(10*i,10*i,10,10);
  
    saveFrame("screenshot-####.png");
 i=i+1;
  }
}

 

Does anybody knows?

Thanks for your reply, but the code you just showed me doesnt do what i wanted to do. Also the first screenshot shows the 10 circles and it doesnt stop making shots after 10.

But still, if the way ive done it with the "ifloop" is not the right way, does anybody know how it should be done?

Thanks, i guess i finally understand that putting a loop in the draw method doesnt make sense. But the code you showed me doesnt work either. It just make one shot of the last position. Actually it behaves the same like my forloop except it stops after the first shot, and i guess thats just because its in the setup and not in the draw method. But shouldnt it draw a circle make a shot, go back to the beginning of the loop, countup "i", draw the moved circle again, make another shot and so on? why doesnt it do it that way ? Maybe im just to blind to see it...

oh ok, I got it : the problem you face comes from the saveFrame() method. the 10 images are produced, but have the same name, so the same file is overwritten 10 times and, as a result, you've got the last image as screenshot-0000.png. this is because the frame counter (that helps naming your image files) is increased at each draw() call only, not at each saveFrame() call.

try this instead :
Code:

save("screenshot-"+i+".png"); 

Isnt that what i do? draw different objects ? Anyway, now i starts to make sense, i didnt know that it only counts up everytime draw is repeated, i thought everyshot gets another number but as i know it i can now tell why it doesnt work. Thanks to both of you!