import java.awt.Color;

public class Vertex3D {
    public float x, y, z, w;           // coordinate of vertex
    public float nx, ny, nz;        // vertex normal
    public float r, g, b;           //color values at vertex
    public boolean hasNormal;

    public Vertex3D()
    {
        nx = ny = nz = 0;
        hasNormal = false;
    }

    public Vertex3D(float xval, float yval, float zval)
    {
        x = xval;
        y = yval;
        z = zval;
        w = 1;
        nx = ny = nz = 0;
        hasNormal = false;
    }
    
    public void copy(Vertex3D v)
    {
        x = v.x;        y = v.y;        z = v.z;    w = v.w;
        nx = v.nx;      ny = v.ny;      nz = v.nz;
        hasNormal = v.hasNormal;
    }

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

    public void addNormal(float xval, float yval, float zval) {
        nx += xval;
        ny += yval;
        nz += zval;
        hasNormal = true;
    }

    public void averageNormals() {
        float l = (float) (1 / Math.sqrt(nx*nx + ny*ny + nz*nz));
        nx *= l;
        ny *= l;
        nz *= l;
    }

    public void normalize( )
    {
        if (w != 1) {
            w = 1 / w;
            x *= w;
            y *= w;
            z *= w;
            w = 1;
        }
    }
    
    public String toString()
    {
        return new String(" ["+x+", "+y+", "+z+", "+w+"]");
    }
}