/*
 * Cube.cs - Sample Cube for Xsharp
 *
 * This file is part of the X# library.
 * Copyright (C) 2002  Southern Storm Software, Pty Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

using System;
using XWindows;

public class Cube3d
{
	// Internal state.
	private static int lastX,lastY;
	private static int degree=0;
	private const int H=200;
	private const int V=50;
	private const int VERTICES=4; // Vertices in Prism
	private const int THETA=4; // How to divide the angles
	
	// Main entry point.
	public static void Main(String[] args)
	{
		Application app = new Application("Cube::Isometric", args);
		TopLevelWindow topLevel = new TopLevelWindow("Cube::Isometric", 600, 480);
		topLevel.PointerMotion += new PointerMotionEventHandler(Motion);
		topLevel.Foreground = new Color(0x00, 0x00, 0x00);
		topLevel.Background = new Color(0xFF, 0xFF, 0xFF);
		Canvas canvas=new Canvas(topLevel);
		canvas.Clear(0,0,topLevel.Width,topLevel.Height);
		canvas.Dispose();
		DrawCube(topLevel,30);
		topLevel.Map();
		app.Run();
		app.Close();
	}

	// Handle mouse pointer motion.
	public static void Motion(Widget widget, int x, int y,
							  ModifierMask modifiers)
	{
		Canvas canvas=new Canvas(widget);
		canvas.Clear(0,0,widget.Width,widget.Height);
		canvas.Dispose();
		degree+=(x-lastX);
		DrawCube(widget,degree);
		lastX = x;
		lastY = y;
	}

	public static void DrawCube(Widget widget,int degree)
	{
		double rad=(degree*3.14)/180;
		int x=widget.Width/3;
		int y=widget.Height/3;
		int []a=new int[2*VERTICES+2];
		for(int i=0;i<VERTICES;i++)
			{
				a[2*i]=(int)(x-H*Math.Sin(rad+3.14*(2*i)/THETA));
				a[2*i+1]=(int)(y-V*Math.Cos(rad+3.14*(2*i)/THETA));
			}
		a[2*VERTICES]=a[0];
		a[2*VERTICES+1]=a[1];
		DrawPolygon(widget,VERTICES,a);
		Canvas canvas=new Canvas(widget);
		for(int i=0;i<VERTICES;i++)
		{
			int x2=a[2*i+1]+H;
			canvas.DrawLine(a[2*i],a[2*i+1],a[2*i],x2);
			a[2*i+1]+=H;
		}
		canvas.Dispose();
		a[2*VERTICES]=a[0];
		a[2*VERTICES+1]=a[1];
		DrawPolygon(widget,VERTICES,a);
	}
	public static void DrawPolygon(Widget widget,int n,int []a)
	{
		Canvas canvas = new Canvas(widget);
		for(int i=0;i<n;i++)
		{
			canvas.DrawLine(a[2*i],a[2*i+1],a[2*i+2],a[2*i+3]);
		}
		canvas.Dispose();
	}

} // class Cube3d