KP3 vectors

castice_ako_vektory.pde

ArrayList<Castica> castice = new ArrayList<Castica>();

PVector gravitacia = new PVector(0, 0.03);


class Castica {
  PVector pozicia;
  PVector smer;
  
  Castica(float kamX, float kamY) {
    pozicia = new PVector(kamX, kamY);
    PVector mys = new PVector(mouseX, mouseY);
    smer = PVector.sub(pozicia, mys);
    smer.div(60);
  }
  
  void kresli() {
    noStroke();
    fill(255);
    circle(pozicia.x, pozicia.y, 10);
  }

  void pohni() {
    smer = PVector.add(smer, gravitacia);
    pozicia = PVector.add( pozicia, smer );
  }
  
  boolean jeVonku() {
   return (pozicia.y > (height*0.9));
  }

}

void setup()
{
  background(0);
  size(800, 800);
  noFill();
  stroke(255);
}

void draw()
{
  background(0);
  for (int i = 0; i< castice.size(); i++) {
    castice.get(i).kresli();
    castice.get(i).pohni();
    
    if (castice.get(i).jeVonku()) {
      castice.remove(i);
    }
  } 
}

void mousePressed() {
  castice.add(new Castica(width / 2, height / 2));
}

void mouseMoved() {
  // tetiva
  stroke(70);
  line(width/2, 0, mouseX, mouseY);
  line(width/2, height, mouseX, mouseY);
  
  // sip
  stroke(255, 0, 0);
  line(mouseX, mouseY, width/2, height/2);
  
}