How to change origin

DWW1234

Hello everyone,

I am trying to rotate circles around the center pixel of the screen using rotate(), but the origin is currently (0,0) and I was wondering if there was a way to change that to the center pixel. Or if there was a better method for rotating around the center pixel?

Thank you in advance

Chrisir

float a;

void setup()
{
  // runs once
  // init
  size(800, 600);
  background(255);
}

void draw() 
{ 
  // runs on and on in a loop
  // 
  background(255);


  // the big rect
  pushMatrix();
  noStroke();
  translate(width/2, height/2);
  rotate(a);
  fill(111);  // gray 
  rect (-50, -60, 100, 120);
  a+=.03;
  popMatrix();

  fill(255, 0, 0);  // red 
  rect (100, 100, 100, 120);
}

jeremydouglass

See also:

• https://processing.org/reference/translate_.html

Note also that if you are doing radial drawing, often it is very helpful to set the mode for your drawing method to CENTER:

• https://processing.org/reference/ellipseMode_.html