/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.$bgL9o70B7n/rev.1331
 * 
 * authors: 
 *   Kevin Crouch
 *   Gregg Blanchard
 *   Andrzej Koper

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 




// Global variables

  
float radius = 30;
 
float ball_dir = 1;  
   
float dy = 0;  
// Direction

  
int ball_X, ball_Y;  
int ball_nX, ball_nY;  
int delay = 3;  
  
// Setup the Processing Canvas
  
void
 
setup(){  
  
size
( 400, 400 );   
  frameRate( 30 );  

  ball_X = width / 2;  
  ball_Y = height / 2;  
  ball_nX = X;  
  ball_nY = Y; 

   

}  
  
// Main draw loop
// If the ball is touching top or bottom edge, reverse direction
 
void
 
draw
(){      
  
// Track circle to new destination
  
  ball_X+=(ball_nX-ball_X)/delay;  
  ball_Y+=(ball_nY-ball_Y)/delay;  
    
  

if
(ball_nY <= 10) {  
    ball_nY = 200;
    ball_nX = 200;   

  } 
  
if
(ball_nY >= 390) {  
    ball_nY = 200;    
    ball_nX = 200;
   
  } 
  
if
(ball_nX >= 390) {  
    ball_nX = 200;
    ball_nY = 200;
       
  } 

if
(ball_nX <= 10) {  
    ball_nX = 200;
    ball_nY = 200;

  } 

// Fill canvas black
  
  
background
( 0 );  
    
  
// Set fill-color to blue
 
fill
( 0, 130, 184 );   
    
  
// Draw circle
  
  
ellipse
( ball_X, ball_Y, radius, radius );                    
}  
  
  
// Set circle's next destination
  
void mouseMoved(){  
  ball_nX = mouseX;  
  
  ball_nY = mouseY;    
}