Resizing Window Causes Problems? (Processing 3)

bogusburger

Heres's a little program I wrote to test a problem I had in a project I'm working on:

int bg = 0;
int i = 0;

void setup() {
  size(790,640);
  surface.setResizable(true);
  test();
}

void draw() {

}

void keyPressed() {
  test();
}

void test() {
  surface.setSize(790, 640+10*i);
  background(bg);
  if (bg == 0) {bg = 50;} else {bg = 0;}
  fill(bg);
  ellipse(width/2, height/2, 200, 200);
  i++;
}

This code should draw a circle in the center of the window every time a key is pressed, along with resizing the window to be 10 pixels longer. However, for some reason the circle stops drawing when I press a key, yet background still changes. This also happens with line() and rect(). The only way I can get the circle to draw is if I put it in the draw() loop, but that will eat CPU. I also tried this in Processing 2 with frame.setSize(), with no luck. Is there an explanation to why this is happening or anything I can do to fix it?

Any help is greatly appreciated!

GoToLoop

The only way I can get the circle to draw is if I put it in the draw() loop, but that will eat CPU.

We can turn off draw() auto-loop w/ noLoop():
https://processing.org/reference/noLoop_.html

Then call it once w/ redraw() or redraw = true; inside keyPressed() for example:
https://processing.org/reference/redraw_.html