Processing 101

Finally, my copy of "Processing" arrived at Waterstones today and as late as it is I sat down to have a quick play, I am very impressed.
It's astonishingly simple to get quick results.

Here is a quick example of an animated Venn type diagram:

 int angle1 = 0;
 int angle2 = 120;
 int angle3 = 240;
 int radius = 40;

 void setup() {
   //start the initial window.
   size(400, 400);
   //start animation.
   frameRate(30);
   smooth();
 }

 void draw() {
 
   //change the position
   angle1 = angle1 + 1;
   angle2 = angle2 - 1;
 
   //clear the animation
   background(255);
     
   fill(0, 0, 255, 90);
   ellipse(200 + cos(radians(angle1)) * radius, 200 + sin(radians(angle1)) * radius, 150, 150);
 
   fill(0, 255, 0, 90);
   ellipse(200 + cos(radians(angle2)) * radius, 200 + sin(radians(angle2)) * radius, 150, 150);

   //no animation, just redraw.
   fill(255, 0, 0, 90);
   ellipse(200 + cos(radians(angle3)) * radius, 200 + sin(radians(angle3)) * radius, 150, 150);

 }

The Processing book looks a whole lot of fun too - it seems very comprehensive and chocked full of information. I am looking forward to delving into it during the week.