float left=20, right=250, top=40, bottom=350;
float ballX=90, ballY=2001, ballDX=3, ballDY=0.2;
float mX, mY;
void draw () {
  //next frame
  scene();
  action();
}
void setup () {
 size(500,500);
 reset();
}
void reset () {
  // Reset
 ballX= left+50; 
 ballY= top+30;
}  
void scene() {
  //// Table
   fill( 100,200,100 );
  strokeWeight(5);
  stroke( 100,30,0 );
  rectMode(CORNERS);
  rect( left, top, right, bottom );
  ellipse(left, top, 30, 30);
  ellipse(right, bottom, 30, 30); 
}
  
void action() {
  myball();
} 

void myball() {
  //// Check boundaries, move ball, draw it.

  if (ballX > right || ballX< left) ballDX= -ballDX; 

  ballX=  ballX + ballDX;
  ballY=  ballY + ballDY;

  fill( 255,0,255 );
  noStroke();
  ellipse( ballX, ballY, 30, 30 );
}


void keyPressed () {
  if (key == 'q') exit();
  if (key == 'r') reset();
}