/*
   File: FractalCanvas.java
   Author: Stefan Robila

   Description: This is a simple exension of the Canvas class with
   additions done to facilitate the drawing of the fractal and the
   printing of the information related to the fractal

   Structure of FractalCanvas with the description of the members

public class FractalCanvas extends Canvas {

   private String line1,line2,line3; - lines of text that will contain
                                       information related to the fractal

   private int depth;                - the depth of the fractal that will
                                       be drawn

   private LFractal f;               - the fractal to be drawn

   private boolean has_fractal=false;- if false, paint() will not do
                                       anything, if true, paint() will
                                       draw the fractal together with the
                                       related information
   Methods:
   -------

   public void paint(Graphics g);    - draws the fractal

   public void draw(LFractal what,int how_much);
                                     - used to set the type of fractal and
                                       the depth
}


*/

// The code:


import java.awt.*;


public class FractalCanvas extends Canvas {

   private String line1,line2,line3;
   private int depth = 0;
   private LFractal f;
   private boolean has_fractal=false;


// paint() will draw the fractal and the related information when the
// has_fractal is true
   public void paint(Graphics g)
   {
      if (has_fractal)
      {
        // compose the lines to be printed. the functions called are
        // nothing else but methods from the LFractal class that return
        // values of the data members. See LFractal.java for a detailed
        // description
        line1 = "Fractal "+f.getName()+" refined "+depth+" times";
        line2 = "Start: "+f.getInitial()+
                "    Angle: "+f.getAngle();
        line3 = "Rule:  "+f.getStart()+"->"+f.getReplace();
    
        // print the lines on the screen
        g.drawString(line1,20,20);
        g.drawString(line2,20,35);
        g.drawString(line3,20,50);
    
        // refine and print the fractal
        f.expand(depth);
        f.DrawPattern(g);
    
        // used to reset the standard data for the fractal
        f.clear();
     };
   }

// draw() will just set the fractal and the depth of the refination and
// then it will call repaint()
   public void draw(LFractal what,int how_much)
   {
     f = what;
     depth = how_much;
     // of course, since you have a fractal, now you can draw it
     has_fractal=true;
     repaint();
   }
}