/*
void mouseReleased(){
  s.release_slider();
}

void mouseDragged(){
  s.drag_slider();
}

void mousePressed(){
  s.jump_slider();
}
*/
class slider{
  float x;
  float y;
  float l;
  float w;
  float value;
  float min;
  float max;
  color background;
  color slide;
  float slidel;
  boolean grabbed;
  String label;
  int fontsize;
  
  slider(){
    x = y = 50;
    l = 100;
    w = 10;
    min = 0;
    max = 100;
    fontsize = 14;
    value = (max-min)/2;
    background = color(0);
    slide = color(0,255,0);
    slidel = 4;
    grabbed = false;
    label = "Slider";
  }
  
  void set_label(String s){
    label = s;
  }
  
  void set_values(float mi, float ma){
    if(mi < ma && mi >= 0){
      min = mi;
      max = ma;
    }
  }  
  
  void set_value(float vi){
    if(vi >= min && vi <= max){
      value = vi;
    }
  }
  
  void draw(){
    float ratio = value/( max-min);
    float p = l*(1.0-ratio);
    fill(background);
    rect(x,y-slidel/2.0,w,l+slidel);  // extend background by slider
    line(x,y,x-5,y); // tic
    line(x,y+l,x-5,y+l); // tic
    textSize(fontsize);
        textLeading(fontsize+2);
    textAlign(CENTER,BOTTOM);
    text(label,x,y-5);
    textSize(fontsize-2);
    textAlign(RIGHT,CENTER);
    if((max-min) > 10){  //  write ints
      text(int(max),x-5,y);
      text(int(min),x-5,y+l);
    }
    else{  // write floats
      text((max),x-5,y);
      text((min),x-5,y+l);
    }
    textAlign(LEFT,CENTER);
    if((max-min) > 10){  //  write ints
      text(int(value),x+w+4,y+p);  //-slidel/2);
    }else{
      text((value),x+w+4,y+p); //-slidel/2);
    }
    fill(slide);
    rect(x,y+p-slidel/2.0,w,slidel);
  }
  
  void set_position(int xp, int yp){
    x = xp;
    y = yp;
  }
  
  void release_slider(){
    grabbed = false;
  }
  
  void drag_slider(){
    if(grabbed == true){
      float ratio = (mouseY-y)/(l);
      value = min + (1-ratio)*(max-min);
      if(value < min)
        value = min;
      if(value > max)
        value = max;
    }
  }
  
  void jump_slider(){
    if(mouseX > x && mouseX < x+w){
      if(mouseY > y && mouseY < y+l){
        float ratio = (mouseY-y)/(l);
        value = min + (1-ratio)*(max-min);
        if(value < min)
          value = min;
        if(value > max)
          value = max;
        grabbed = true;
      }
    }
  }
  
  float get(){
    return value;
  }
  
};