/*
 * ----------------------------------------------------------------------
 * ConvexPolygon.h: convex polygon class
 *
 * ======================================================================
 *  AUTHOR:  Wei Qiao <qiaow@purdue.edu>
 *           Purdue Rendering and Perceptualization Lab (PURPL)
 *
 *  Copyright (c) 2004-2006  Purdue Research Foundation
 *
 *  See the file "license.terms" for information on usage and
 *  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 * ======================================================================
 */
#ifndef _CONVEX_POLYGON_H_
#define _CONVEX_POLYGON_H_

#include "Vector4.h"
#include "Plane.h"
#include <assert.h>
#include <vector>

typedef std::vector<Vector4> VertexVector;
typedef std::vector<Vector4> TexVector;

class ConvexPolygon {
public:
    VertexVector vertices;
    TexVector texcoords;
    int volume_id;	//which volume this polygon slice belongs to
    
    ConvexPolygon();
    ConvexPolygon(VertexVector vertices);
    
    void transform(Mat4x4 mat);
    void translate(Vector4 shift);
    
    // Clips the polygon, retaining the portion where ax + by + cz + d >= 0
    void clip(Plane &clipPlane, bool copy_to_texcoords);
    void Emit(bool use_texture);
    void Emit(bool use_texture, Vector3& shift, Vector3& scale);
    void copy_vertices_to_texcoords();

    void set_id(int v_id) { 
	volume_id = v_id; 
    };
    void append_vertex(Vector4 vert) {
	vertices.push_back(vert);
    }
    void insert_vertex(unsigned int index, Vector4 vert) {
	assert(index<vertices.size());
	vertices.insert(vertices.begin() + index, vert);
    }
    bool is_retained(Vector4 point, Vector4 plane) {
	return ((point * plane) >= 0);  
    }
};

#endif