/* Copyright (C) 2000  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package gnu.awt.j2d;

import java.awt.Color;
import java.awt.Image;
import java.awt.Shape;
import java.awt.Rectangle;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.image.ImageObserver;

/**
 * Base class for graphics state objects (State pattern, GOF book)
 * that represents the current pipeline configuration. The Graphics2D
 * object forwards most of the requests to the state object. The
 * Graphics2D object itself only administers properties that are not
 * specific for a certain state.
 */
public abstract class AbstractGraphicsState implements Cloneable
{
  Graphics2DImpl frontend;

  public void setFrontend(Graphics2DImpl frontend)
  {
    this.frontend = frontend;
  }
  
  public void dispose()
  {
    frontend = null;
  }

  // -------- Graphics methods:
  
  public abstract void setColor(Color color);

  public abstract void setPaintMode();

  public abstract void setXORMode(Color altColor);

  public abstract void setFont(Font font);

  public abstract FontMetrics getFontMetrics(Font font);

  public abstract void setClip(Shape clip);

  public abstract Shape getClip();
  public abstract Rectangle getClipBounds();

  public abstract void copyArea(int x, int y, 
				int width, int height,
				int dx, int dy);

  public abstract void drawLine(int x1, int y1,
				int x2, int y2);
  
  public abstract void fillRect(int x, int y,
				int width, int height);
  
  public abstract void clearRect(int x, int y,
				 int width, int height);
  
  public abstract void drawRoundRect(int x, int y,
				     int width, int height,
				     int arcWidth, int arcHeight);
  
  public abstract void fillRoundRect(int x, int y,
				     int width, int height,
				     int arcWidth, int arcHeight);
  
  public abstract void drawOval(int x, int y,
				int width, int height);
  
  public abstract void fillOval(int x, int y,
				int width, int height);
  
  public abstract void drawArc(int x, int y,
			       int width, int height,
			       int startAngle, int arcAngle);
  
  public abstract void fillArc(int x, int y,
			       int width, int height,
			       int startAngle, int arcAngle);
  
  public abstract void drawPolyline(int[] xPoints, int[] yPoints,int nPoints);

  public abstract void drawPolygon(int[] xPoints, int[] yPoints, int nPoints);
    
  public abstract void fillPolygon(int[] xPoints, int[] yPoints, int nPoints);

  public abstract boolean drawImage(Image image, int x, int y,
				    ImageObserver observer);
    

  // -------- Graphics2D methods:

  public abstract void draw(Shape shape);

  public abstract void fill(Shape shape);
    
  public abstract boolean hit(Rectangle rect, Shape text, boolean onStroke);
  
  public abstract void drawString(String text, int x, int y);
  
  public abstract void drawString(String text, float x, float y);
  
  public abstract void translate(int x, int y);
  
  public abstract void translate(double tx, double ty);
  
  public abstract void rotate(double theta);
  
  public abstract void rotate(double theta, double x, double y);
  
  public abstract void scale(double scaleX, double scaleY);
  
  public abstract void shear(double shearX, double shearY);
}
