class Slider
{
  float x, y;
  float target;
  float rad;
  boolean over;
  float xmin, xmax;
  
  float minval, valrange;
  
  Slider(float xpercent, float iy, float xmin, float xmax, float irad, float minval, float valrange) {
    this.minval = minval;
    this.valrange = valrange;
    this.xmin = xmin; this.xmax = xmax;
    x = (xmax-xmin)*xpercent + xmin;
    y = iy;
    rad = irad;
    over = false;
  }
  
  boolean inside(float mouseRad) {
    return overCircLast(x, y, rad + mouseRad);
  }
  
  boolean update(float mouseRad, float mXmove, float mYmove) {
    over = false;
    if (overCircLast(x, y, rad + mouseRad)) {
      over = true;
      if (mousePressed) {
        x += mXmove;
        if (x > xmax)
          x = xmax;
        if (x < xmin)
          x = xmin;
        //y += mYmove;
      }
    }
    return over;
  }
  
  float getDist(int i, int j) {
    float dx = x-(float)i;
    float dy = y-(float)j;
    return sqrt(dx*dx+dy*dy);
  }
  
  float getVal() {
    return minval + valrange*(x-xmin)/(xmax-xmin);
  }
  
  void display() {
    fill(255,50,50);
    ellipse(x,y,rad*2,rad*2);
    if (over) {
      fill(255);
      line(xmin,y,xmax,y);
      fill(255,255,0);
      ellipse(x,y,rad-1,rad-1);
    }
    stroke(255);
    text(getVal(),xmin,y-10);
  }
}

color valToCol(float val, float upscale, float eps) {
  if (val > eps) {
    int cc = (int)(val * upscale);
    cc += 150;
    cc = lock(cc,150,255);
    return color(0,cc,0);
  } else if (val < -eps) {
    int cc = (int)(-val * upscale);
    cc += 150;
    cc = lock(cc,150,255);
    return color(cc,0,0);
  } else {
    return color(255,255,0);
  }
}

boolean overCirc(float x, float y, float rad)
{
  float dx = x - mouseX;
  float dy = y - mouseY;
  return (dx*dx + dy*dy < rad*rad);
}

boolean overCircLast(float x, float y, float rad)
{
  float dx = x - lastMx;
  float dy = y - lastMy;
  return (dx*dx + dy*dy < rad*rad);
}


int lock(int val, int minv, int maxv) 
{ 
  return  min(max(val, minv), maxv); 
}