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how to listen the mouse wheel in processing

/ Published in: Processing
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This is the way for listen the mouse wheel and interact from it in processing, enjoy

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  1. //////////////////////////////////////////////////////////
  2. //Code By cgiles
  3. //Description : how to add mouse wheel interactivy
  4. //////////////////////////////////////////////////////////
  5. // default size of my ellipse
  6. int tailleEllipse=100;
  7. void setup(){
  8.   size(640,480);
  9.   frameRate(30);
  10.   // this will add a new event listener to your sketch
  11.   // for listen how the mouse scroll is used
  12.    addMouseWheelListener(new java.awt.event.MouseWheelListener() { 
  13.     public void mouseWheelMoved(java.awt.event.MouseWheelEvent evt) { 
  14.       mouseWheel(evt.getWheelRotation());
  15.   }}); 
  16. }
  17. void draw(){
  18.   background(255);
  19. ellipse(width/2,height/2,tailleEllipse,tailleEllipse);
  20. }
  21. // this is the event listener of mouse wheel
  22. void mouseWheel(int delta) {
  23.   // add the value of wheel's scolling to my ellipse's size
  24.   // for a better effiency i multiply the scrolling value by 5
  25.   tailleEllipse+=delta*5;
  26. }

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