//************************************************
//*** 2D animation written by Jarek Rossignac to illustrate how to rotate 
//*** an object around an arbitrary center (here, the cursor location)
//************************************************
float t=0;  // animation time

void setup() { // ** SETUP (executed once at initalization) **
  size(500, 500, P3D);             // opens window of given size                           
  PFont font = loadFont("Chalkboard-Bold-48.vlw"); 
  textFont(font, 24);  // loads font (use >Tools>Create Font> to change font
  } 

void draw() {                  // ** DRAW (executed at each frame) **
  background(255);            // erases screen with white background
  fill(0); text("Press mouse to specify center of rotation",15,20);
                              // frame origin is at upper left corner
  translate(mouseX, mouseY);  // translate frame to mouse (center of rotation)
  if(mousePressed) rotateZ(cos(t*PI));     // rotation around mouse
  translate(-mouseX, -mouseY);  // translate frame back back

  translate(width/2,height/2);  // move frame to center of screen
  fill(250,50,50);             // color (RGBa<255) for text
  text("Jarek Rossignac",-100,-20);  // display text offset to be centered at origin of frame
  
  t+=0.03;  // advance animation
  }; // end draw