Canvas Demo 2

<eval> double x = 50; double y = 0; double angle = 45;</eval>

int r = 0; int g = 0; int b = 0; int state = 0;

void bounce() {

angle = angle +45 -5+(int)(Math.random()*5);
if (angle > 360) angle = angle -360;
if (angle < 0) angle = angle +360;

}

void advance(){

 if (y >  80) bounce();
 if (y < -80) bounce();
 if (x >  280) bounce();
 if (x < -280) bounce();
 x = x + 10*Math.cos(angle*Math.PI/180); 
 y = y + 10*Math.sin(angle*Math.PI/180); 
 if (state == 0){
  if(r<255){ 
     r++;
     canvas.setColor(r,g,255-r);
  }else{state = 1;}
 }
 if (state == 1){
  if(g<255){ 
     g++;
     canvas.setColor(255-g,g,b);
  }else{state = 2;}
 }
 if (state == 2){
  if(b<255){ 
     b++;
     canvas.setColor(0,255-b,b);
  }else{state = 0; r=0; g=0; b=0;}
 }

} canvas.clear();

for (int i =0; i<200; i++){

canvas.setWidth(3);
canvas.ellipse((int)x+300,(int)y+100,3);
advance();

}