Modify a text file: $/players4331j.java

$/players4331j.java

//// Exercise 4331j:  Defining and using objects

String title=  "Exercise 4331j:  Defining and using objects";
String author=  "Prof. BAM";
String news=  "(Press ? key for instructions; d to debug.)";
String quitcount="";

int left=20, right=  left+600;        // Boundaries of a rectangular field.
int top=50, bottom=  top+400;         // (Leave room for text).
int grassSlant=2;
int countdown=5;

Player george, john, thomas, james, andrew;

void setup() {
  //// Set up the screen and reset everything else.
  size( right+20, bottom+30 );
  reset();    // New players.
}
void reset() {
  //// Create new players ////
  george=  new Player( 100, 100, "George" );
  john=  new Player( "John", 150, 150, 150 );        // Gray, short and fat
  john.h=  49;
  john.w=  36;
  thomas=  new Player( "Thomas" );
  thomas.h=  75;    // Tall
  james=  new Player( "James" );
  andrew=  new Player( width/2, height/2, 5, 3, "Old Hickory" );    // Fast
}

void draw() {
  //// Next frame:  move the players, then draw them.
  background( 200, 200, 255 );    // Sky blue;
  scene();
  action();
  check();
  show();
  messages();
}
void scene() {
  //// Draw a light-brown field, plus some grass at the bottom.
  fill( 200, 150, 100 );
  noStroke();
  rectMode(CORNERS);
  rect( left, top, right, bottom );      // Field.
  // Grass. //
  for (int x=10; x<width; x= x+25) {
    float xtop=  x;
    if (x < mouseX-50) xtop=  x + 9;
    else if (x > mouseX+50) xtop=  x - 9;
    else xtop=x;
    //
    stroke( 0, 150, 0 );
    strokeWeight(4);
    line( x,height,  xtop,height-25 );       //// One blade of grass from bottom of screen.
    if ( abs(mouseX-xtop) < 10 ) {
      fill(255,255,0);                      // Yellow flower.
      ellipse(xtop,height-22, 10,10 );
    }
  }
  strokeWeight(1);
}
void messages() {
  //// Now, add text messages.
  stroke(0);
  fill(0);
  textSize( 20 );
  text( title, width/4, 25 );
  textSize( 12 );
  text( news, width/3, 40 );
  text( author, 20, height-15 );
  fill(255,0,0);
  text( quitcount, 10, 40 );
}
void action() {
  //// Move all players. ////
  if (key == '?') {
    help();
    return;
  }
  george.move();
  john.move();
  thomas.move();
  james.move();
  andrew.move();
}
void check() {
    // Check for collisions
    // STUB ++++++++++
    if (george.hitme( thomas.x, thomas.y, 20 )) {
      background(0);                      // Flash black
      news=  "George hit thomas!";
    }
    if (andrew.hitme( james.x, james.y, 20 )) {
      background(255,0,0);                      // Flash red
      news=  "Andrew hit james!";
      james.hitcount += 10;
    }
}
void show() {
  //// Show all players ////
  george.show();
  john.show();
  thomas.show();
  james.show();
  andrew.show();
}

class Player {
  //////// Player HAS: has position, velocity, etc. and drawing characteristics.
  //// Player DOES:  move(), show()
 
  float x,y;    // Position on the screen (i.e. "coordinates")
  float dx,dy;  // How far to move in one flame (i.e. "velocity")
 
  String name;      // Name of this player 
  int r1, g1, b1;   // Color of this player (body);
  int r2, g2, b2;   // Second for  this player.
  int w=30,h=50;    // Width and height of this player's body (with default values).
  
  int hitcount=0;

//// METHODS ////
  void move() {
    //// Move this player. ////
    if (x<left+w/2 || x>right-w/2) dx=  -dx;     // Bounce off boundaries.
    if (y<top+h/2 || y>bottom-h/2) dy=  -dy; 
    x += dx;
    y += dy;
  }
  void show() {
    //// Display this player on the screen (at x,y, with color rgb, etc.)
    rectMode( CENTER );
    fill( r1,g1,b1 );
    rect( x,y, w,h );
    ellipseMode( CENTER );
    fill( r2,g2,b2 );
    ellipse( x, y-h/2-12, 24, 24 );    // Head
    text( name, x-w/2+3, y-10 );
    if (hitcount>0) {
      text( hitcount, x-10, y+10 );
    }
    // DEBUG //
    if (key == 'd') {
      text( x, x-20, y );
      text( y, x-20, y+20 );
      text( dx, x+50, y );
      text( dy, x+50, y+20 );
    }
  }
  
  //// METHODS TO DETECT HITS ////
  boolean hitme( float xx, float yy, float near ) {
    //// Return true if point (xx,yy) is near me.
    if ( xx < x - w/2 - near ) return false;        // Too far to the left.
    if ( xx > x + w/2 + near ) return false;
    if ( yy < y - h/2 - 24 - near ) return false;        // Above my head!
    if ( yy > y + h/2 + 10 - near ) return false;        // Below my feet!
    return true;    //// YIKES!  I've been hit!
  }
  void hitstart() {
    //// Bump hitcount, then start ar random position.
    hitcount++;
    news=  name+" was hit!";
    start();
  }

//// CONSTRUCTORS ////
  // NOTE:  There is no default constructor.  Player must have a name!  ////
  Player( String s ) {
     //// Name and color only.
     name=  s;
     r1=  int( random(255) );      // ??? Replace with rancolor()
     g1=  int( random(255) );
     b1=  int( random(255) );
     contrast();
     start();       // Start with random coordinates and velocity. 
  }
  Player( String s, int r, int g, int b ) {
     //// Name and color only.  Random position and velocity.
     name=  s;
     r1=  r;
     g1=  g;
     b1=  b;
     contrast();
     start();       // Start with random coordinates and velocity. 
  }
  Player( float x, float y, String s ) {
     //// Specify position (but not color). ////
     name=  s;
     rancolor();
     contrast();
     // Start with specified coordinates and random velocity. 
     this.x=  x;
     this.y=  y;
     dx=  random( 0.5, 3.5 );
     dy=  random( 0.5, 2.5 );
  }
  Player( float x, float y, String s, int r, int g, int b ) {
     //// Specify everything except speed (and second color). ////
     name=  s;
     rancolor();
     contrast();
     // Start with specified coordinates and random velocity. 
     this.x=  x;
     this.y=  y;
     dx=  random( 0.5, 3.5 );
     dy=  random( 0.5, 2.5 );
  }
  Player( float x, float y, float dx, float dy, String s ) {
     //// Specify everything (except contrasting color).
     name=  s;
     rancolor();
     contrast();
     // Specified coordinates and velocity. 
     this.x=  x;
     this.y=  y;
     this.dx=  dx;
     this.dy=  dy;
  }
  Player( float x, float y, float dx, float dy, String s, int r, int g, int b ) {
     //// Specify everything (except contrasting color).
     name=  s;
     r1=  r;
     g1=  g;
     b1=  b;
     contrast();
     // Start with specified coordinates and velocity. 
     this.x=  x;
     this.y=  y;
     this.dx=  dx;
     this.dy=  dy;
  }
  Player() {}
  // Methods used by constructors. //
  void start() {
     // Random position and speed for this player.
     x=  random( left+w, right-w );
     y=  random( top+h, bottom-h );
     dx=  random( 0.5, 3.5 );
     dy=  random( 0.5, 2.5 );
  }
  void rancolor() {
     // Create random color.     
     r1=  int( random(255) );
     g1=  int( random(255) );
     b1=  int( random(255) );
  }
  void contrast() {
     // Create a contrasting color.
     r2=  (r1+128) % 256;
     g2=  (g1+128) % 256;
     b2=  (b1+128) % 256;
  }
      
}// END OF class Player. //

//// EVENT HANDLERS. ////
void keyPressed() {
  //// Respond to keys.
  // Quit?  (Give user another chance!)  
  if (key == 'q') {
     if (countdown<1) {
       exit();
     } else {
       countdown--;
       fill(0);
       quitcount=  countdown+"   Are you sure you want to quit?  ";
       news=  quitcount;
     }
  } else { 
    //// Reset countdown, when any other key is pressed.
    countdown=5; 
    news="";
    quitcount="";        // Reeset messages, too.
  }
  news=  "(Press ? key for instructions; d to debug.)";
  //// Now, check fo other keys
  if (key == 'r') reset();
}
void mousePressed() {
  //// Click handler.
  if ( george.hitme( mouseX, mouseY, 10) ) george.hitstart();
  if ( john.hitme( mouseX, mouseY, 10) ) john.hitstart();
  if ( thomas.hitme( mouseX, mouseY, 10) ) thomas.hitstart();
  if ( james.hitme( mouseX, mouseY, 10) ) james.hitstart();
  if ( andrew.hitme( mouseX, mouseY, 10) ) andrew.hitstart();
}

void help() {
  //// Display instructions.
  background(255);
  fill(255,0,0);
  textSize(20);
  text( "I N S T R U C T I O N S", width/3, 80 );
  text( "- - - - - - - - - - - -", width/3, 90 );
  textSize(12);
  int j=0;
  text( "q  quit", width/3, 100+12*j++ );
  text( "r  restart", width/3, 100+12*j++ );
  text( "d  debug", width/3, 100+12*j++ );
  text( "blah blah blah", width/3, 100+12*j++ );
  text( "blah blah blah", width/3, 100+12*j++ );
  text( "blah blah blah", width/3, 100+12*j++ );
  // +++++ STUB ++++
}

class Zoog extends Player {
}

Zoog z;