import Drawable;
import java.awt.Color;

public class Vertex3D implements Drawable {
    public float x, y, z;           // coordinate of vertex
    public int nfaces;
    public float nx, ny, nz;        // vertex normal
    public int argb;                // color of vertex

    public Vertex3D()
    {
        argb = 0;
    }

    public Vertex3D(float xval, float yval, float zval)
    {
        x = xval;
        y = yval;
        z = zval;
        nx = ny = nz = 0;
        nfaces = 0;
        argb = 0;
    }

    public void setNormal(float xval, float yval, float zval)
    {
        nx = xval;
        ny = yval;
        nz = zval;
        nfaces = 0;
    }

    public void addNormal(float xval, float yval, float zval)
    {
        float l = (float) Math.sqrt(xval*xval + yval*yval + zval*zval);
        xval = xval / l;
        yval = yval / l;
        zval = zval / l;
        nx += xval;
        ny += yval;
        nz += zval;
        nfaces += 1;
    }

    public void averageNormals()
    {
        float l = (float) Math.sqrt(nx*nx + ny*ny + nz*nz);
        nx = nx / l;
        ny = ny / l;
        nz = nz / l;
    }

    public Color getColor()
    {
        return new Color(argb);
    }

    public void setColor(Color color)
    {
        argb = color.getRGB();
    }

    public void Draw(Raster r)
    {
        int ix = (int) (x + 0.5f);
        int iy = (int) (y + 0.5f);
        if ((ix < 0) || (ix >= r.width)) return;
        if ((iy < 0) || (iy >= r.height)) return;
        r.setPixel(argb, ix, iy);
    }

    public String toString()
    {
        return new String(" ["+x+", "+y+", "+z+"]");
    }
}