import sub_arctic.lib.*;

import sub_arctic.output.drawable;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;

/** 
 * Small interactor class that draws a spring 
 * @author Khai Truong
 */
class labeled_spring
  extends base_parent_interactor 
{
  /** Text for the label we display */
  protected String _text = "";

  /** Font to display label in */
  protected Font _font = null;

  /** Metrics object for current font */
  protected FontMetrics _metrics = null;

  /** 
   * Constructor 
   * @param int    wid width of the object.
   * @param int    hi  height of the object.
   * @param String lab text of the display label
   */
  public labeled_spring(int wid, int hi, String lab)  
  {
    super(0,0,wid,hi);
    set_text(lab);
    set_font(new Font("Helvetica",Font.PLAIN,9));
  }

  /** 
   * Text for the label we display 
   * @return String the string we are currently displaying.
   */
  public String text() 
  {
    return _text;
  }

  /** 
   * Set the text for the label we display 
   * @param String t the new label text.
   */
  public void set_text(String t) 
  {
    if (!_text.equals(t))
    {
      _text = t;
      damage_self();
    }
  }

  /** 
   * Font to display label in 
   * @return Font the font we are display in.
   */
  public Font font() 
  {
    return _font;
  }

  /** 
   * Set font to display label in 
   * @param Font f the new font.
   */
  public void set_font(Font f) 
  {
    if (_font != f)
	  {
      _font = f;
	    _metrics = manager.get_metrics(f);
      damage_self();
	  }
  }

  /** 
   * Output routine for the interactor.
   * @param drawable surf the drawing surface we draw on.
   */
  public void draw_self_local(drawable surf)
  {
    int sz_w, sz_h;

    /* draw a rectangle at the bounds */
    surf.setColor(Color.black);
    surf.drawLine(0,h()/2, w()/8, h()/2);
    surf.drawLine(w()/8,h()/2,w()/4,h()-1);
    surf.drawLine(w()/4,h()-1,(3*w())/8,0);
    surf.drawLine((3*w())/8,0,w()/2,h()-1);
    surf.drawLine(w()/2,h()-1,(5*w())/8,0);
    surf.drawLine((5*w())/8,0,(3*w()/4),h()-1);
    surf.drawLine((3*w())/4,h()-1,(7*w()/8),h()/2);
    surf.drawLine(w()-1-w()/8,h()/2, w()-1, h()/2);

    /* measure the string and clear behind it */
    sz_w = _metrics.stringWidth(text()) + 4;
    sz_h = _metrics.getHeight() + 2;

    /* draw the text tag */
    surf.setColor(Color.red);
    surf.setFont(font());
    surf.drawString(text(), 2, _metrics.getAscent()+1);

    /* let superclass draw any children */
    super.draw_self_local(surf);
  }
}