package lilWorld;
import processing.core.PApplet;


public class HScrollbar{

	  int swidth, sheight;    // width and height of bar
	  int xpos, ypos;         // x and y position of bar
	  float spos, newspos;    // x position of slider
	  int sposMin, sposMax;   // max and min values of slider
	  int loose;              // how loose/heavy
	  boolean over;           // is the mouse over the slider?
	  boolean locked;
	  float ratio;
	  PApplet parent;

	  HScrollbar (int xp, int yp, int sw, int sh, int l, PApplet p) {
		parent = p;
	    swidth = sw;
	    sheight = sh;
	    int widthtoheight = sw - sh;
	    ratio = (float)sw / (float)widthtoheight;
	    xpos = xp;
	    ypos = yp-sheight/2;
	    spos = xpos;
	    newspos = spos;
	    sposMin = xpos;
	    sposMax = xpos + swidth - sheight;
	    loose = l;
	  }

	  void update() {
	    if(over()) {
	      over = true;
	    } 
	    else {
	      over = false;
	    }
	    if(parent.mousePressed && over) {
	      locked = true;
	    }
	    if(!parent.mousePressed) {
	      locked = false;
	    }
	    if(locked) {
	      newspos = constrain2(parent.mouseX-sheight/2, sposMin, sposMax);
	    }
	    if(parent.abs(newspos - spos) > 0) {
	      spos = spos + (newspos-spos)/loose;
	    }
	  }

	   public int constrain2(int val, int minv, int maxv) 
	  {
	    return parent.min(parent.max(val, minv), maxv);
	  }

	  boolean over() {
	    if(parent.mouseX > xpos && parent.mouseX < xpos+swidth &&
	    		parent.mouseY > ypos && parent.mouseY < ypos+sheight) {
	      return true;
	    } 
	    else {
	      return false;
	    }
	  }

	  public void draw() {
		  parent.fill(255);
		  parent.rectMode(parent.CORNER);
		  parent.rect(xpos, ypos, swidth, sheight);
	    if(over || locked) {
	    	parent.fill(153, 102, 0);
	    } 
	    else {
	    	parent.fill(102, 102, 102);
	    }
	    parent.rect(spos, ypos, sheight, sheight);
	  }

	  void setPos(float s) {
	    spos = xpos + s*(sposMax-sposMin);
	    newspos = spos;
	  }

	  float getPos() {
	    // convert spos to be values between
	    // 0 and the total width of the scrollbar
	    return ((spos-xpos))/(sposMax-sposMin);// * ratio;
	  }

}