import java.awt.*;
import java.applet.Applet;
import java.util.*;

public class TopDownWorld extends PictureWorld {

	public void initializePictureChoices() {

    	Picture twoWedges = overlay (wedge(Color.green), flipDiagonally(wedge(Color.blue)));
   	this.addPictureChoice("UpperDiagCopy", upperDiagCopy(twoWedges));
  	this.addPictureChoice("UpperDiagCopy2", upperDiagCopy2(twoWedges));
  	this.addPictureChoice("UpperDiagCopy3", upperDiagCopy3(twoWedges));
 	this.addPictureChoice("twoDiags", twoDiags(twoWedges));
  	this.addPictureChoice("fourDiags", fourDiags(twoWedges));
  	this.addPictureChoice("fourDiags2", fourDiags2(twoWedges));
    	this.addPictureChoice("topDown", makeComplexPic(twoWedges));
  	}
  	
  	public Picture fourPics (Picture p1, Picture p2, Picture p3, Picture p4) {
		return above(beside(p1,p2), beside(p3,p4));
	}
	
	public Picture rotations (Picture p) {
		return fourPics(clockwise270(p), p, clockwise180(p), clockwise90(p));
	}	

	public Picture upperDiagCopy(Picture p){
		return fourPics(empty(), p, empty(), empty());
	}
	
	public Picture upperDiagCopy2(Picture p){
		return upperDiagCopy(upperDiagCopy(p));
	}
	
	public Picture upperDiagCopy3(Picture p){
		return upperDiagCopy(upperDiagCopy2(p));
	}
	
	public Picture twoDiags(Picture p){
		return overlay(upperDiagCopy(p), p);
	}
	
	public Picture fourDiags(Picture p){
		return overlay(upperDiagCopy3(p),
				overlay (upperDiagCopy2(p),
					overlay(upperDiagCopy(p), p)));
	}
		
	public Picture fourDiags2(Picture p){
		return overlay(upperDiagCopy(upperDiagCopy(upperDiagCopy(p))),
					overlay(upperDiagCopy(upperDiagCopy(p)), 
						overlay(upperDiagCopy(p), p)));
	}
	
	public Picture makeComplexPic(Picture p){
		return rotations(fourDiags(p));
	}
 	
 	public Picture wedge (Color c) {
 		Poly w = new Poly(c, true);
 		w.addPoint(0.0, 0.0);
 		w.addPoint(0.5, 0.0);
 		w.addPoint(0.5, 0.5);
 		return w;
 	}
 }