Modify a text file: $/xMAQp4.pde

$/xMAQp4.pde

//// moon moves across the sky

float x,y;              // Position of moon and bird.
float moonX, moonY;
float birdX=250, birdY=100, birdXspeed=4, birdYspeed=0.07;
float horizon;
float ericX, ericY, ericXspeed, ericYspeed;         // Position of eric 
float roverX, roverY, roverXspeed, roverYspeed, roverFast=3;   //Positon of rover
float roverW=60, roverH=50;

//// SETUP:  Define screen size, set modes.
void setup() {
   size( 500, 300 );
   horizon= height/2;
   
// RESET:  // Start the moon half-way across the screen.
            moonX=  width/2;
            moonY=  50;

}

//// DRAW:  sky & moon & tree
void draw() {
    // SCENE:  sky, moon, tree, house.
    background( 0, 0, 0 );
    fill( 150, 150, 150 );
    ellipse( moonX, moonY, 60,60 );                 
    fill( 0, 255, 0 );
    rect( 100,100, 100,50 );
    rect( 130,50, 15,40);
    triangle( 100,100, 200,100, 170,60 );
    fill( 255, 0, 0);
    rect( 110,110, 30,40);
    fill( 100, 50, 0);
    rect( 295, 90, 10,60);
    fill( 200, 300, 0);
    ellipse( 300,100, 50,50);
//Bird  
    fill(255,0,0);
    triangle(birdX, birdY, birdX-50,birdY-10, birdX-50,birdY+10);
    float wingtip=-20;
  if ( birdX%100 > 60 ) { wingtip=  +40; }
  triangle( birdX-40,birdY, birdX-60,birdY, birdX-60,birdY-wingtip );
//Grass
       fill( 50, 150, 50 );
       rect( 0, horizon,width,height-horizon );
//Eric  
     fill(255,0,0);
     ellipse( 350,200, 70,60);
     fill(250,255,0);
     ellipse( 350,170, 60,50);
     fill(150, 150, 150);
     ellipse( 340,225, 30,10);
     fill(150, 150, 150);
     ellipse( 365,225, 30,10);
     fill(300,300,300);
     ellipse( 340,170, 15,20);
     fill(300,300,300);
     ellipse( 357,170, 15,20);
     fill(0,0,0);
     ellipse( 340,170, 1,1);
     fill(0,0,0);
     ellipse( 357,170, 1,1);
     fill(250,255,0);
     ellipse(320,200, 20,10);
     fill(250,255,0);
     ellipse(380,200, 20,10);
//rover    
      fill(100,50,0);
      rect(200,170, 50,30);
      rect(240,160, 30,20);
      rect(230,160, 20,10);
      fill(300,300,300);
      ellipse(260,170, 10,10);
      fill(0,0,0);
      ellipse(260,170, 2,2);

//Rover chases eric
roverXspeed= roverFast * (ericX-roverX) / 40;
roverYspeed= roverFast * (ericY-roverY) / 40;
roverX= roverX + roverXspeed;
roverY= roverY + roverYspeed;
if ( dist(ericX,ericY, roverX,roverY) < 10); 
  
    
   // ACTION:  moon  and bird crosses sky, reset to right side.
    if (moonX > width) {
      moonX=  1;
      birdX=  1;
    }
      moonX=  moonX + 2;
      birdX=  birdX + 2;

// MESSAGES.
            fill(300,300,300);
            text( "moon and bird moves across the sky.", width/4, 30 );
            // Also display the author and file name.
            text( "M.A.Quijano / dynamic1.java", 10, height-10 );
}