how to detect presentmode in processing
in processing sketches can be run in "present" mode. which means a frame is generated in fullscreen mode and the code of the sketch is centered on the screen.
to change the size of the actual sketch depending on wether presend mode is active or not
the following code can be used
void setup() {
for ( int i = 0; i < args.length; i ++ ) {
if ("--present".equals(args[i])) {
present = true;
break;
}
}
if (present) {
size(screen.width,screen.height, OPENGL);
} else {
size(600,600, OPENGL);
}
// do your normal setup stuff here
}

