float[] x = new float[100];  
float[] y = new float[100]; 
PFont font;
  
void setup() {  
    size(800, 800);
    smooth();
    background (0);
    fill (255);
    textAlign (CENTER);
    
    font = createFont ("Base4", 24);
    textFont (font);
    text ("bitte erst die alt-Taste, dann mit der Maus klicken", width/2, height/2);
      
    // Initialisierung aller Elemente beider Arrays  
    for (int i = 0; i < 30; i++) {  
        x[i] = random(width);  
        y[i] = random(height); 
    }  
}  
  
void draw() {  

     // Zeichnen von Kreisen unter Einsatz einer Schleife und der Arrays 
    for (int i = 0; i < 100; i++) {  
        point (x[i], y[i]); 
       x[i] = x[i] + random (-5, 5);
       y[i] = y[i] + random (-5, 5);
    }  
}  

void mousePressed () {
  
  for (int i = 0; i < 30; i++) { 
       beginShape ();
       noFill ();
       stroke (random(255), random (255), 0);
       curveVertex (x[i], y[i]);
       curveVertex (x[i], y[i]);
       curveVertex (width/2+ random (50), height/2+ random (150));
       curveVertex (mouseX, mouseY);
       curveVertex (mouseX, mouseY); 
       endShape ();  
  }
}

void keyPressed () {
  if (key == 's') {
    saveFrame ("strukturen-####.png");
  }
 
  if (key == CODED) {
    if (keyCode == ALT) {
    background (0);
    }
  }
}