import java.applet.*;
import java.awt.*;

public class blocks extends Applet
{
	int width,height;
	Graphics bg;
	Image buf;
	Font font=new Font("TimesRoman",Font.BOLD,56);
	FontMetrics fm;
	Color[] clr={new Color(224,0,0),new Color(0,224,0),new Color(0,0,224),
		new Color(255,224,0),new Color(224,0,224),new Color(0,224,224),
		new Color(0,00,128),new Color(255,120,0)};
	Color bgclr=new Color(255,224,160);
	Color faceclr=new Color(224,160,92);
	Color topclr=new Color(180,120,92);
	Color sideclr=new Color(160,100,60);
	int[] xi,yi,t;
	int n=24,ii,xold,yold,xoff,yoff;
	int bw=60,xleft=60,ytop=60;
	String letters ="ABCDEFGHIJKLMNOPQRSTVWXY";


	public blocks()
	{
	}

	public String getAppletInfo()
	{
		return "Name: blocks\r\n" +
		       "Author: Bob Roesser\r\n";
	}


	public void init()
	{
		width=Integer.parseInt(getParameter("width"));
		height=Integer.parseInt(getParameter("height"));
		xi=new int[n];
		yi=new int[n];
		t=new int[n];
		buf=createImage(width,height);
		bg=buf.getGraphics();
		bg.setFont(font);
		fm=bg.getFontMetrics();
		for(int i=0;i<n;i++){
			xi[i]=xleft+2*bw*(i/4);
			yi[i]=ytop+2*bw*(i%4);}
		resize(width,height);
	}

	public void destroy()
	{
	}

	
	public void update(Graphics g){paint(g);}
	public void paint(Graphics g){
		int i;
		// sort blocks bottom-to-top left-to-right
		for(i=0;i<n;i++)t[i]=i;
		boolean mark=true;
		while(mark){
			mark=false;
			for(i=1;i<n;i++){
//				if(yi[t[i-1]]<yi[t[i]]||(yi[t[i-1]]==yi[t[i]]&&xi[t[i-1]]>xi[t[i]])){
				if(xi[t[i-1]]-yi[t[i-1]]>xi[t[i]]-yi[t[i]]){
					int j=t[i];
					t[i]=t[i-1];
					t[i-1]=j;
					mark=true;}}}
		bg.setColor(bgclr);
		bg.fillRect(0,0,width,height/3);
		bg.setColor(bgclr.darker());
		bg.fillRect(0,height/3,width,2*height/3);
		for(i=0;i<n;i++){
			paintblockside(bg,xi[t[i]],yi[t[i]]);
			paintblocktop(bg,xi[t[i]],yi[t[i]]);}
		for(i=0;i<n;i++)paintblockface(bg,xi[t[i]],yi[t[i]],clr[t[i]%8],""+letters.charAt(t[i]));
		g.drawImage(buf,0,0,this);
	}

	public void paintblockface(Graphics g, int x,int y, Color c, String s){
		g.setColor(c);
		g.fillRect(x-bw/2,y-bw/2,bw,bw);
		g.setColor(faceclr);
		g.fillRect(x-bw/2+3,y-bw/2+3,bw-6,bw-6);
		int sh=fm.getHeight();
		int sw=fm.stringWidth(s);
		g.setColor(c);
		g.drawString(s,x-sw/2,y+sh/4);
	}

	public void paintblockside(Graphics g, int x,int y){
		int[] px=new int[4],py=new int[4];
		g.setColor(sideclr);
		px[0]=x+bw/2;py[0]=y-bw/2;
		px[1]=x-bw/4+bw;py[1]=y-bw;
		px[2]=px[1];py[2]=py[1]+bw;
		px[3]=px[0];py[3]=py[0]+bw;
		g.fillPolygon(px,py,4);
	}

	public void paintblocktop(Graphics g, int x,int y){
		int[] px=new int[4],py=new int[4];
		g.setColor(topclr);
		px[0]=x-bw/2;py[0]=y-bw/2;
		px[1]=x-bw/4;py[1]=y-bw;
		px[2]=px[1]+bw;py[2]=py[1];
		px[3]=x+bw/2;py[3]=py[0];
		g.fillPolygon(px,py,4);
	}

	public void start()
	{
	}
	
	public void stop()
	{
	}


	public boolean mouseDown(Event evt, int x, int y){
		int i;
		ii=-1;
		for(i=0;i<n;i++){
			if(x>xi[i]-bw/2&&x<xi[i]+bw/2&&y>yi[i]-bw/2&&y<yi[i]+bw/2){
				ii=i;
				break;}}
		if(ii>=0){
			xoff=x-xi[ii];
			yoff=y-yi[ii];
			xold=x;
			yold=y;}
		return true;
	}

	public boolean mouseUp(Event evt, int x, int y){
		if(ii>=0){
			xi[ii]=x-xoff;
			yi[ii]=y-yoff;
			repaint();
			xold=x;
			yold=y;}
		return true;
	}

	public boolean mouseDrag(Event evt, int x, int y){
		if(ii>=0){
			int xx=x-xoff,yy=y-yoff,i,iii=ii;
			boolean mark=true;
//			while(mark){
				mark=false;
				for(i=0;i<n;i++){
					if(i==iii)continue;
					if((xx>xi[i]-bw&&xx<xi[i]+bw)&&(yy>yi[i]-bw&&yy<yi[i]+bw)){
						mark=true;
						break;}}
				System.out.println("i="+i);
				if(mark){
					ii=-1;
					// four cases
					if(xx<xi[i]&&yy<yi[i]){
						if(xi[i]-xx>yi[i]-yy)xx=xi[i]-bw;
						else yy=yi[i]-bw;}
					if(xx<xi[i]&&yy>=yi[i]){
						if(xi[i]-xx>yy-yi[i])xx=xi[i]-bw;
						else yy=yi[i]+bw;}
					if(xx>=xi[i]&&yy<yi[i]){
						if(xx-xi[i]>yi[i]-yy)xx=xi[i]+bw;
						else yy=yi[i]-bw;}
					if(xx>=xi[i]&&yy>=yi[i]){
						if(xx-xi[i]>yy-yi[i])xx=xi[i]+bw;
						else yy=yi[i]+bw;}}
			//}
			xi[iii]=xx;
			yi[iii]=yy;
			repaint();
			xold=x;
			yold=y;}
		if(ii<0)mouseDown(evt,x,y);
		return true;
	}

	public boolean mouseMove(Event evt, int x, int y){
		return true;
	}

	public boolean keyDown(Event evt,int key){
			return true;
	}

}