/******
mouse event ontrol
*******/
int x,y,t,w,h,R,m;
void setup(){
  size(640,480);
  x=200;y=300;
  w=50;h=50;
  R=255;
  m=0;
}

void draw(){
  background(255,255,255);
  stroke(R,0,0);
  fill(0,0,R);   
  if (m==0)
    ellipse(x,y,w,h);
  else
     rect(x,y,w,h);
  stroke(255,0,0);
  line(mouseX,mouseY,pmouseX,pmouseY);
}
void mouseWheel(MouseEvent e){
  if (e.getCount()>0)
      R=R-10;
  else if (e.getCount()<0)
      R=R+10;
  println("R="+R);
  }
void mouseMoved(){
  x=mouseX;
  y=mouseY;
  }
void mousePressed(){
  if(mouseButton==LEFT) m=0;
  else if(mouseButton==RIGHT) m=1;
  }