import java.awt.*;
import javax.swing.*;
import java.awt.Graphics2D;
import java.awt.geom.*; 

/**
 * Draws two colored triangles and illuminates them with one source.
 * Simple, with hard-coded parameters.
 * Uses GeneralPath to draw the triangles, after removing z coordinates.
 *
 * @author Bob Futrelle
 * @version 0.1  15 July 2003
 * First triangle has corners at 50 on each of the x,y and z axes.
 * Color is greenish, 0.1, 0.1, 0.1
 * Second one is in the x,y plane, corners at origin and 50 on x and y.
 * Color is reddish, 1.0, 0.1, 0.1
 
 * Light source is along the z axis.
 * Light color is primarily red, 1.0, 0.5, 0.5.
 *
 */
 
 class IllumPanel extends JPanel {
 
 	public void paintComponent(Graphics g) {
		Graphics2D g2 = (Graphics2D) g;

 		 }
 
/**
 * Inner class for simple 3D colored triangle.
 */
 class Triangle {
 
 	Vec3D v1, v2, v3;
 	Color color;
 	
 	Triangle(Vec3D v1, Vec3D v2, Vec3D v3, Color c) {
 		this.v1=v1; this.v2=v2; this.v3=v3; color = c;
 		}

	/** Uses cross product */ 		
 	Vec3D getNormal() {
 		Vec3D edge1 = Vec3D.diff(v2,v1);
 		Vec3D edge2 = Vec3D.diff(v3,v2);
 		Vec3D normal = Vec3D.crossProd(edge2,edge1);
 	
 	}
 		
 } // class Triangle
 
 /**
  * Inner class for 3D vector and operations
  */
 class Vec3D {
 
 	double[] vec;
 	
 	void printVec() {
		DecimalFormat threePlaces = new DecimalFormat( "0.000");
		for(int p=0, 
		return fourPlaces.format(matrix[0][0]) + " " +  	
 	} // printVec()
 
 } // class Vec3D 			
 } // class SDDrawer