import java.awt.*;
import java.util.*;

public class Surface extends Polygon
{
    Vector vertices = new Vector();
    float center;
    boolean selected = true;
    String url;
    String text = new String();
    Polygon stereoPair = new Polygon();
    Color color;
    Color shade;
    
    public Surface()
    {
    }
    
    public Surface(Color color)
    {
        this.color = color;
    }

    void colorAndShade(float x0, float y0, float z0)
    {
        if(npoints > 2)
        {
            Vertex vertex1 = (Vertex)vertices.elementAt(0);
            Vertex vertex2 = (Vertex)vertices.elementAt(1);
            Vertex vertex3 = (Vertex)vertices.elementAt(2);
            float x1 = vertex2.coordinate[0]-vertex1.coordinate[0];
	        float y1 = vertex2.coordinate[1]-vertex1.coordinate[1];
	        float z1 = vertex2.coordinate[2]-vertex1.coordinate[2];
	        float x2 = vertex3.coordinate[0]-vertex1.coordinate[0];
	        float y2 = vertex3.coordinate[1]-vertex1.coordinate[1];
	        float z2 = vertex3.coordinate[2]-vertex1.coordinate[2];
	        float r0 = (float)Math.sqrt(x0*x0+y0*y0+z0*z0);
	        float r1 = (float)Math.sqrt(x1*x1+y1*y1+z1*z1);
	        float r2 = (float)Math.sqrt(x2*x2+y2*y2+z2*z2);
	        float angle = (float)Math.sqrt((1+(x0*(y1*z2-y2*z1)-y0*(x1*z2-x2*z1)+z0*(x1*y2-x2*y1))/(r0*r1*r2)*(x1*y2-x2*y1)/(r1*r2))/2);
	        shade = new Color((int)(color.getRed()*angle),(int)(color.getGreen()*angle),(int)(color.getBlue()*angle));
	    }
	    else
	    {
	        shade = color;
	    }
    }
    
    void setSelected(boolean selected)
    {
        this.selected = selected;
    }
    
    boolean getSelected()
    {
        return selected;
    }

    public void addVertex(Vertex vertex)
    {
        vertices.addElement(vertex);
        super.addPoint(0,0);
        stereoPair.addPoint(0,0);
    }
    
    public void setHttp(String url, String text)
    {
        this.url = url;
        this.text = text;
    }
    
    public String getURL()
    {
        return url;
    }
    
    public String getText()
    {
        return text;
    }
    
    public void render(float x, float y, float scale)
    {
        for(int j = 0; j < npoints; j++)
        {
            Vertex currentVertex = (Vertex)vertices.elementAt(j);
            xpoints[j] = (int)(currentVertex.coordinate[0]*scale+x);
            ypoints[j] = (int)(currentVertex.coordinate[1]*scale+y);
        }
    }
    
    public void renderStereo(float x, float y, float scale, float nosy)
    {
        for(int j = 0; j < npoints; j++)
        {
            Vertex currentVertex = (Vertex)vertices.elementAt(j);
            xpoints[j] = (int)((currentVertex.coordinate[0]*scale+60.0)*nosy/(nosy-currentVertex.coordinate[2]*scale)-60.0+x);
            ypoints[j] = (int)(currentVertex.coordinate[1]*scale*nosy/(nosy-currentVertex.coordinate[2]*scale)+y);
            stereoPair.xpoints[j] = (int)((currentVertex.coordinate[0]*scale-60.0)*nosy/(nosy-currentVertex.coordinate[2]*scale)+60.0+x);
            stereoPair.ypoints[j] = (int)(currentVertex.coordinate[1]*scale*nosy/(nosy-currentVertex.coordinate[2]*scale)+y);
        }
    }
    
    public void renderPolar(float x, float y, float scale, float nosy)
    {
        for(int j = 0; j < npoints; j++)
        {
            Vertex currentVertex = (Vertex)vertices.elementAt(j);
            xpoints[j] = (int)((currentVertex.coordinate[0]*scale+60.0)*nosy/(nosy-currentVertex.coordinate[2]*scale)-60.0+x-x/2);
            ypoints[j] = (int)(currentVertex.coordinate[1]*scale*nosy/(nosy-currentVertex.coordinate[2]*scale)+y);
            stereoPair.xpoints[j] = (int)((currentVertex.coordinate[0]*scale-60.0)*nosy/(nosy-currentVertex.coordinate[2]*scale)+60.0+x+x/2);
            stereoPair.ypoints[j] = (int)(currentVertex.coordinate[1]*scale*nosy/(nosy-currentVertex.coordinate[2]*scale)+y);
        }
    }
    
    public void calculateCenter()
    {
        center = 0;
        for(int j = 0; j < npoints; j++)
        {
            Vertex currentVertex = (Vertex)vertices.elementAt(j);
            center += currentVertex.coordinate[2]/npoints;
        }
    }
}