import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;
import java.awt.Rectangle;

/*
 * This class implements a TurtleGraphics LABEL graphics operation.
 * 

 * @author Guy Haas
 */

class TGLabelOp implements ImageObserver, TGGraphicsOp
{
   private Color color;
   private Font font;
   private String text;
   private TGPoint where;

   //
   // constructor
   //
   public TGLabelOp( String label, TGPoint where, Font font, Color color )
   {
      this.color = color;
      this.font = font;
      this.text = label;
      this.where = where;
   }


   public Rectangle doIt( Image inMemoryImage )
   {
      int canvasWidth = inMemoryImage.getWidth( this );
      if ( canvasWidth < 0 )
         return null;
      int canvasX = where.canvasX( canvasWidth );
      int canvasHeight = inMemoryImage.getHeight( this );
      if ( canvasHeight < 0 )
         return null;
      int canvasY = where.canvasY( canvasHeight );
      Graphics g = inMemoryImage.getGraphics();
      g.setColor( color );
      g.setFont( font );
      FontMetrics fm = g.getFontMetrics();
      int crX = canvasX;
      int crWidth = fm.stringWidth( text );
      int crHeight = fm.getHeight();
      int crY = canvasY - (crHeight - fm.getDescent());
      g.setClip( crX, crY, crWidth, crHeight );
      g.drawString( text, canvasX, canvasY );
      g.dispose();
      Rectangle clipRect = new Rectangle( crX, crY, crWidth, crHeight );
      return clipRect;

   } // end doIt()


   public Color getColor()
   { return color; }


   public boolean imageUpdate(Image img, int flags, int x, int y, int wd, int ht)
   {
      return true;
   }

} // end class TGLabelOp