drawParam.h

/********************************************************************/
/* Copyright (c) 2015 DG Technologies Inc. and Yuzi Mizuno          */
/* All rights reserved.                                             */
/********************************************************************/
#ifndef _MGDrawParam_HH_
#define _MGDrawParam_HH_

#include <iosfwd>
#include "mg/MGCL.h"

class MGObject;
class MGContext;
class MGOfstream;
class MGIfstream;
class mgTLInputParam;

#define MAXDIVNUM 64 
#define SURFACE_TOL_BY_CURVE 1.5 



class MG_DLL_DECLR MGDrawParam{

public:


MGDrawParam(
    double curve_tolerance=-1.,
    double surface_tolerance=-1.,
    double maximum_edge_length=-1., 
    double span_length_wire=20,
    int line_desity_wire_face=1
);

MGDrawParam(
    const MGObject& obj,
    double span_length_wire=20
);

MGDrawParam(
    const MGContext& contx,
    double span_length_wire=20
);

MGDrawParam::MGDrawParam(
    const mgTLInputParam& tlpara
);


MG_DLL_DECLR friend std::ostream& operator<< (std::ostream& out, const MGDrawParam& para);

// Serialization fucntion.
MG_DLL_DECLR friend MGOfstream& operator<< (MGOfstream& buf, const MGDrawParam& para);
MG_DLL_DECLR friend MGIfstream& operator>> (MGIfstream& buf, MGDrawParam& para);

double span_length_wire()const{return m_span_length_wire;};
int line_desity_wire_face()const{return m_line_desity_wire_face;};
double curve_tolerance_tess()const{return m_curve_tolerance_tess;};
double surface_tolerance_tess()const{return m_surface_tolerance_tess;};
double maximum_edge_length_tess()const{return m_maximum_edge_length_tess;};

void set_line_density(int line_density=1){m_line_desity_wire_face=line_density;};
void set_span_length(double span_length){m_span_length_wire=span_length;};
void set_maximum_edge_length_tess(double maximum_edge_length){
    m_maximum_edge_length_tess=maximum_edge_length;};

private:

//Build m_curve_tolerance_tess and m_surface_tolerance_tess.
void build_crv_srf_tolerance(
    double curve_tolerance,//Maximum deviation allowed to approximate curves.
    double surface_tolerance//Maximum deviation allowed to approximate surfaces.
);

double m_span_length_wire;//The maximum length of the one line segment to approximate
        //curves by a polyline.
int m_line_desity_wire_face;//Indicates how many wires be drawn for the inner lines of
double m_curve_tolerance_tess;//The maximum deviation from a curve allowed for the tessellaiton
double m_surface_tolerance_tess;//The maximum deviation allowed of a traiangle from surfaces
double m_maximum_edge_length_tess;//The maximum length of a triangle of the tessellation.

};

double compute_curve_tolerance(
    const MGObject& obj,    
    double span_length      
);
 // end of BASE group

#endif