Hi,

I'm beginning in processing, and I need to do a basic slider
(those of libraries like ControlP5 are too complicated for me at the moment, and I would to modify styles)

So I started to make one, and I have already problems...

It say me that there is an NullPointer exception

There my code :

Code:

Slider slider1;

void setup(){
  /////////////////////////////////////
  size (500,500);
  background(120);
  /////////////////////////////////////

  Slider slider1 = new Slider(20,20,100,20);
}

void draw(){
  slider1.dessiner();
}

class Slider{
  int sPosX, sPosY;
  int sLargeur, sHauteur;
  //int sMin, sMax;
  //int sInitial;
  //int nom;
  //int valeur;

  Slider(int isPosX, int isPosY, int isLargeur, int isHauteur){
    sPosX = isPosX;
    sPosY = isPosY;
    sLargeur = isLargeur;
    sHauteur = isHauteur;
  }

  void dessiner(){
    noStroke();
    fill(150);
    rect(sPosX,sPosY,sLargeur,sHauteur);
    fill(80);
    rect(sPosX,sPosY,sLargeur,sHauteur);
  }

  /*void bouger(){
   if(mousePressed){
   rect(sPosX,sPosY,mouseX-sPosX,sHauteur);
   }
   }*/
}
 

if someone can have a look, thank you !