Unable to increment the value!!

p2b2

Nmaste all, a very basic question, why won't processing increase the value of mouseX in the given code? if i use "mouseX++" instead of "x++" it does increase it

void setup() {
  size(600, 600);
  background(0);
  stroke(255);
  fill(255, 10);
}

float a = 0;

void draw() {
  float x = mouseX;
  float y = mouseY;

  point(x, y);
  x++;
}

Thanks :)

GoToLoop

Both x & y variables were declared inside function draw(): float x = mouseX, y = mouseY;
Therefore once draw() ends, both x & y cease to exist as well, for their lifespan is scoped to draw(). :-B

p2b2

But draw will end only if I press the stop button, till then it should keep updating the x,y values which it does, only thing is I think its not running the X++ line? dunno..... I m a bit confused here.

koogs

no, draw() is called again and again, automatically. but each call is separate. and variables local to draw() are only available during that one call.

don't change mouseX and mouseY, they are built in and should only be read, not modified.

GoToLoop

Function draw() is automatically called back by Processing at about 60 FPS by default!
Therefore, both x & y variables are "born" and "die" at about 60 FPS! @-)

https://Processing.org/reference/draw_.html

p2b2

Thanks a lot guys I got it now :D