Modify a text file: $/monsters.pde

$/monsters.pde

//// Practice - '1/11/9

float xHero=320, yHero=240;
float xMonsters=100, yMonsters=100;
float dx=2, dy=1;
int nMonsters=0;
boolean hit;            //// True if monster is near hero.

void setup() {
  //// 
  size( 640, 480 );
}

void draw() {
  background(255);
  
  if (key == 'y') background(255,255,0);
  text( "The last key was:  " + key,  200,100);
  
  fill(0);
  //--  text( "@@@ There are " + nMonsters + " monsters!", 400,20);
  //// Check if hero is hit by monsters.
  hit=  isOver( xHero,yHero, xMonsters,yMonsters, 40);

//// Hero
  moveHero();
  drawHero();
  //// Monsters
  moveMonsters();
  drawMonsters();
}

void keyPressed() {
  ////
  background(0);
}

void mouseClicked() {
  //// When mouse is clicked, add another monster (over 20, down 10);
  nMonsters += 1;
}

boolean isOver( float x1, float y1, float x2, float y2, float margin) {
  //// Return true iff (x1,y1) is within 50 of (x2,y2).
  return  dist(x1,y1, x2,y2) < margin  ;
}

void  moveHero()
{
  //// hero foloows mouse.
  xHero=  mouseX;
  yHero=  mouseY;
}
void   drawHero() {
  // Head
  if (hit) {
    fill(0,255,0);      // Green, if hit!
  } else {
    fill(255,127,127);
  }
  ellipseMode(CENTER);
  ellipse(xHero, yHero, 50, 50);
  
  // Body.
  if (hit) {
    fill(0,255,0);
  } else {
    fill(0,255,255);
  }
  rectMode(CENTER);
  rect(xHero, yHero+75, 100, 100);
}
void   moveMonsters() {
  //// Move the monsters -- bounce off walls.
  //--  text( "@@@ moveMonsters was called", 300, 60);
  //--  text( "@@@ dx=" + dx, 300, 80);
  //--  text( "@@@ dy=" + dy, 300, 100);
  xMonsters += dx;
    if (xMonsters>width) dx=  -2;
    if (xMonsters<0) dx=  +2;
  yMonsters += dy;
    if (yMonsters>height) dy=  -1;
    if (yMonsters<0) dy=  +1;
}
void   drawMonsters() {
  //// Use a loop to draw them all.
  fill(0);
  text( "@@@ There are " + nMonsters + " monsters!", 400,40);

int j;
  float x=xMonsters, y=yMonsters;
  for ( j=0; j<nMonsters; j++) {
    //// Draw each Monster.
    drawOne(x,y);                // Draw one monster at (x,y);
    // Next one is over 20, down 10
    x=  x + 20;
    y=  y + 10;
  }
}
void     drawOne( float x, float y) {
  // Draw one monster at (x,y);
  //--  text( "@@@ drawOne():  x=" + dx, 300, 120);
  //--  text( "@@@ drawOne():  y=" + dy, 300, 140);

fill(255,0,255);
  triangle( x,y, x-10,y+20, x+10,y+20);
}