Modify a text file: $/practice_ball.pde

$/practice_ball.pde

//// Practice ball hitting guy.

float x, y, w=50, h=70;
float dx=1, dy=1;

String s="";

void setup() {
  size( 400,300);
  rectMode(RADIUS);
}

void draw() {
  
  background(255,255,191);
  fill(0);
  text( "P to pause.", 10,10);
  text( s, 10,100);

//// Ball
  fill(0,0,255);
  ellipse( x, y, 10, 10);
  
  // PAUSE, if "P" is last key pressed.
  if (key != 'P'  && key !='p' ) {
    x = x + dx;
    y=  y + dy;
  }
  
  if (x>400) { dx=  -dx; }
  else if (x<0) { dx = -dx; }
  if (y>300) { dy=  -dy; }
  else if (y<0) { dy = -dy; }
  
  //// Guy
  if (x>mouseX-w/2 && x<mouseX+w/2
    && y>mouseY-h/2 && y<mouseY+h/2) {
      fill(255,0,0); 
      background(255,255,0);
      ellipse(mouseX-w/4,mouseY-h/2-15, 30,20);
      ellipse(mouseX+w/4,mouseY-h/2-15, 30,20);
    } else { 
      fill(0,255,0); 
    }

// Draw the guy  
  rect( mouseX, mouseY, w/2, h/2);
  
  
}

void keyPressed() {
  //// Reset dx, dy, and display the key;
  // ???? dx=1; dy=1;
  s = s + key;
}

void mouseClicked() {
  //// Faster, each click.
  dx *= 2;
  if (abs(dx)>20) { dx = dx/20; }
  dy *= 3;
  if (abs(dy)>30) { dy /= 30; }
}