[wxWidgets.git] / samples / opengl / penguin / dxfrenderer.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        dxfrenderer.cpp
// Purpose:     DXF reader and renderer
// Author:      Sandro Sigala
// Modified by:
// Created:     2005-11-10
// Copyright:   (c) Sandro Sigala
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#include "wx/wfstream.h"
#include "wx/txtstrm.h"

#if !wxUSE_GLCANVAS
    #error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
#endif

#ifdef __DARWIN__
    #include <OpenGL/glu.h>
#else
    #include <GL/glu.h>
#endif

#include <sstream>

#include "dxfrenderer.h"

#include "wx/listimpl.cpp"
WX_DEFINE_LIST(DXFEntityList)
WX_DEFINE_LIST(DXFLayerList)

// Conversion table from AutoCAD ACI colours to RGB values
static const struct { unsigned char r, g, b; } aci_to_rgb[256] = {
/*   0 */ {255, 255, 255},
/*   1 */ {255,   0,   0},
/*   2 */ {255, 255,   0},
/*   3 */ {  0, 255,   0},
/*   4 */ {  0, 255, 255},
/*   5 */ {  0,   0, 255},
/*   6 */ {255,   0, 255},
/*   7 */ {255, 255, 255},
/*   8 */ {128, 128, 128},
/*   9 */ {192, 192, 192},
/*  10 */ {255,   0,   0},
/*  11 */ {255, 127, 127},
/*  12 */ {204,   0,   0},
/*  13 */ {204, 102, 102},
/*  14 */ {153,   0,   0},
/*  15 */ {153,  76,  76},
/*  16 */ {127,   0,   0},
/*  17 */ {127,  63,  63},
/*  18 */ { 76,   0,   0},
/*  19 */ { 76,  38,  38},
/*  20 */ {255,  63,   0},
/*  21 */ {255, 159, 127},
/*  22 */ {204,  51,   0},
/*  23 */ {204, 127, 102},
/*  24 */ {153,  38,   0},
/*  25 */ {153,  95,  76},
/*  26 */ {127,  31,   0},
/*  27 */ {127,  79,  63},
/*  28 */ { 76,  19,   0},
/*  29 */ { 76,  47,  38},
/*  30 */ {255, 127,   0},
/*  31 */ {255, 191, 127},
/*  32 */ {204, 102,   0},
/*  33 */ {204, 153, 102},
/*  34 */ {153,  76,   0},
/*  35 */ {153, 114,  76},
/*  36 */ {127,  63,   0},
/*  37 */ {127,  95,  63},
/*  38 */ { 76,  38,   0},
/*  39 */ { 76,  57,  38},
/*  40 */ {255, 191,   0},
/*  41 */ {255, 223, 127},
/*  42 */ {204, 153,   0},
/*  43 */ {204, 178, 102},
/*  44 */ {153, 114,   0},
/*  45 */ {153, 133,  76},
/*  46 */ {127,  95,   0},
/*  47 */ {127, 111,  63},
/*  48 */ { 76,  57,   0},
/*  49 */ { 76,  66,  38},
/*  50 */ {255, 255,   0},
/*  51 */ {255, 255, 127},
/*  52 */ {204, 204,   0},
/*  53 */ {204, 204, 102},
/*  54 */ {153, 153,   0},
/*  55 */ {153, 153,  76},
/*  56 */ {127, 127,   0},
/*  57 */ {127, 127,  63},
/*  58 */ { 76,  76,   0},
/*  59 */ { 76,  76,  38},
/*  60 */ {191, 255,   0},
/*  61 */ {223, 255, 127},
/*  62 */ {153, 204,   0},
/*  63 */ {178, 204, 102},
/*  64 */ {114, 153,   0},
/*  65 */ {133, 153,  76},
/*  66 */ { 95, 127,   0},
/*  67 */ {111, 127,  63},
/*  68 */ { 57,  76,   0},
/*  69 */ { 66,  76,  38},
/*  70 */ {127, 255,   0},
/*  71 */ {191, 255, 127},
/*  72 */ {102, 204,   0},
/*  73 */ {153, 204, 102},
/*  74 */ { 76, 153,   0},
/*  75 */ {114, 153,  76},
/*  76 */ { 63, 127,   0},
/*  77 */ { 95, 127,  63},
/*  78 */ { 38,  76,   0},
/*  79 */ { 57,  76,  38},
/*  80 */ { 63, 255,   0},
/*  81 */ {159, 255, 127},
/*  82 */ { 51, 204,   0},
/*  83 */ {127, 204, 102},
/*  84 */ { 38, 153,   0},
/*  85 */ { 95, 153,  76},
/*  86 */ { 31, 127,   0},
/*  87 */ { 79, 127,  63},
/*  88 */ { 19,  76,   0},
/*  89 */ { 47,  76,  38},
/*  90 */ {  0, 255,   0},
/*  91 */ {127, 255, 127},
/*  92 */ {  0, 204,   0},
/*  93 */ {102, 204, 102},
/*  94 */ {  0, 153,   0},
/*  95 */ { 76, 153,  76},
/*  96 */ {  0, 127,   0},
/*  97 */ { 63, 127,  63},
/*  98 */ {  0,  76,   0},
/*  99 */ { 38,  76,  38},
/* 100 */ {  0, 255,  63},
/* 101 */ {127, 255, 159},
/* 102 */ {  0, 204,  51},
/* 103 */ {102, 204, 127},
/* 104 */ {  0, 153,  38},
/* 105 */ { 76, 153,  95},
/* 106 */ {  0, 127,  31},
/* 107 */ { 63, 127,  79},
/* 108 */ {  0,  76,  19},
/* 109 */ { 38,  76,  47},
/* 110 */ {  0, 255, 127},
/* 111 */ {127, 255, 191},
/* 112 */ {  0, 204, 102},
/* 113 */ {102, 204, 153},
/* 114 */ {  0, 153,  76},
/* 115 */ { 76, 153, 114},
/* 116 */ {  0, 127,  63},
/* 117 */ { 63, 127,  95},
/* 118 */ {  0,  76,  38},
/* 119 */ { 38,  76,  57},
/* 120 */ {  0, 255, 191},
/* 121 */ {127, 255, 223},
/* 122 */ {  0, 204, 153},
/* 123 */ {102, 204, 178},
/* 124 */ {  0, 153, 114},
/* 125 */ { 76, 153, 133},
/* 126 */ {  0, 127,  95},
/* 127 */ { 63, 127, 111},
/* 128 */ {  0,  76,  57},
/* 129 */ { 38,  76,  66},
/* 130 */ {  0, 255, 255},
/* 131 */ {127, 255, 255},
/* 132 */ {  0, 204, 204},
/* 133 */ {102, 204, 204},
/* 134 */ {  0, 153, 153},
/* 135 */ { 76, 153, 153},
/* 136 */ {  0, 127, 127},
/* 137 */ { 63, 127, 127},
/* 138 */ {  0,  76,  76},
/* 139 */ { 38,  76,  76},
/* 140 */ {  0, 191, 255},
/* 141 */ {127, 223, 255},
/* 142 */ {  0, 153, 204},
/* 143 */ {102, 178, 204},
/* 144 */ {  0, 114, 153},
/* 145 */ { 76, 133, 153},
/* 146 */ {  0,  95, 127},
/* 147 */ { 63, 111, 127},
/* 148 */ {  0,  57,  76},
/* 149 */ { 38,  66,  76},
/* 150 */ {  0, 127, 255},
/* 151 */ {127, 191, 255},
/* 152 */ {  0, 102, 204},
/* 153 */ {102, 153, 204},
/* 154 */ {  0,  76, 153},
/* 155 */ { 76, 114, 153},
/* 156 */ {  0,  63, 127},
/* 157 */ { 63,  95, 127},
/* 158 */ {  0,  38,  76},
/* 159 */ { 38,  57,  76},
/* 160 */ {  0,  63, 255},
/* 161 */ {127, 159, 255},
/* 162 */ {  0,  51, 204},
/* 163 */ {102, 127, 204},
/* 164 */ {  0,  38, 153},
/* 165 */ { 76,  95, 153},
/* 166 */ {  0,  31, 127},
/* 167 */ { 63,  79, 127},
/* 168 */ {  0,  19,  76},
/* 169 */ { 38,  47,  76},
/* 170 */ {  0,   0, 255},
/* 171 */ {127, 127, 255},
/* 172 */ {  0,   0, 204},
/* 173 */ {102, 102, 204},
/* 174 */ {  0,   0, 153},
/* 175 */ { 76,  76, 153},
/* 176 */ {  0,   0, 127},
/* 177 */ { 63,  63, 127},
/* 178 */ {  0,   0,  76},
/* 179 */ { 38,  38,  76},
/* 180 */ { 63,   0, 255},
/* 181 */ {159, 127, 255},
/* 182 */ { 51,   0, 204},
/* 183 */ {127, 102, 204},
/* 184 */ { 38,   0, 153},
/* 185 */ { 95,  76, 153},
/* 186 */ { 31,   0, 127},
/* 187 */ { 79,  63, 127},
/* 188 */ { 19,   0,  76},
/* 189 */ { 47,  38,  76},
/* 190 */ {127,   0, 255},
/* 191 */ {191, 127, 255},
/* 192 */ {102,   0, 204},
/* 193 */ {153, 102, 204},
/* 194 */ { 76,   0, 153},
/* 195 */ {114,  76, 153},
/* 196 */ { 63,   0, 127},
/* 197 */ { 95,  63, 127},
/* 198 */ { 38,   0,  76},
/* 199 */ { 57,  38,  76},
/* 200 */ {191,   0, 255},
/* 201 */ {223, 127, 255},
/* 202 */ {153,   0, 204},
/* 203 */ {178, 102, 204},
/* 204 */ {114,   0, 153},
/* 205 */ {133,  76, 153},
/* 206 */ { 95,   0, 127},
/* 207 */ {111,  63, 127},
/* 208 */ { 57,   0,  76},
/* 209 */ { 66,  38,  76},
/* 210 */ {255,   0, 255},
/* 211 */ {255, 127, 255},
/* 212 */ {204,   0, 204},
/* 213 */ {204, 102, 204},
/* 214 */ {153,   0, 153},
/* 215 */ {153,  76, 153},
/* 216 */ {127,   0, 127},
/* 217 */ {127,  63, 127},
/* 218 */ { 76,   0,  76},
/* 219 */ { 76,  38,  76},
/* 220 */ {255,   0, 191},
/* 221 */ {255, 127, 223},
/* 222 */ {204,   0, 153},
/* 223 */ {204, 102, 178},
/* 224 */ {153,   0, 114},
/* 225 */ {153,  76, 133},
/* 226 */ {127,   0,  95},
/* 227 */ {127,  63, 111},
/* 228 */ { 76,   0,  57},
/* 229 */ { 76,  38,  66},
/* 230 */ {255,   0, 127},
/* 231 */ {255, 127, 191},
/* 232 */ {204,   0, 102},
/* 233 */ {204, 102, 153},
/* 234 */ {153,   0,  76},
/* 235 */ {153,  76, 114},
/* 236 */ {127,   0,  63},
/* 237 */ {127,  63,  95},
/* 238 */ { 76,   0,  38},
/* 239 */ { 76,  38,  57},
/* 240 */ {255,   0,  63},
/* 241 */ {255, 127, 159},
/* 242 */ {204,   0,  51},
/* 243 */ {204, 102, 127},
/* 244 */ {153,   0,  38},
/* 245 */ {153,  76,  95},
/* 246 */ {127,   0,  31},
/* 247 */ {127,  63,  79},
/* 248 */ { 76,   0,  19},
/* 249 */ { 76,  38,  47},
/* 250 */ { 51,  51,  51},
/* 251 */ { 91,  91,  91},
/* 252 */ {132, 132, 132},
/* 253 */ {173, 173, 173},
/* 254 */ {214, 214, 214},
/* 255 */ {255, 255, 255}
};

inline DXFVector Cross(const DXFVector& v1, const DXFVector& v2)
{
    return DXFVector(v1.y*v2.z - v1.z*v2.y, v1.z*v2.x - v1.x*v2.z, v1.x*v2.y - v1.y*v2.x);
}

void DXFFace::CalculateNormal()
{
    DXFVector v01, v02;
    v01.x = v0.x - v1.x;
    v01.y = v0.y - v1.y;
    v01.z = v0.z - v1.z;
    v02.x = v0.x - v2.x;
    v02.y = v0.y - v2.y;
    v02.z = v0.z - v2.z;
    n = Cross(v01, v02);
    float mod = sqrt(n.x*n.x + n.y*n.y + n.z*n.z);
    n.x /= mod;
    n.y /= mod;
    n.z /= mod;
}

// convert an AutoCAD ACI colour to wxWidgets RGB colour
inline wxColour ACIColourToRGB(int col)
{
    wxASSERT(col >= 0 && col <= 255);
    return wxColour(aci_to_rgb[col].r, aci_to_rgb[col].g, aci_to_rgb[col].b);
}

// DXFReader constructor
DXFRenderer::DXFRenderer()
{
    m_loaded = false;
}

// DXFReader destructor
DXFRenderer::~DXFRenderer()
{
    Clear();
}

// deallocate all the dynamic data
void DXFRenderer::Clear()
{
    m_loaded = false;
    {
        for (DXFLayerList::compatibility_iterator node = m_layers.GetFirst(); node; node = node->GetNext())
        {
            DXFLayer *current = node->GetData();
            delete current;
        }
    }
    m_layers.Clear();
    {
        for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
        {
            DXFEntity *current = node->GetData();
            delete current;
        }
        m_entities.Clear();
    }
}

int DXFRenderer::GetLayerColour(const wxString& layer) const
{
    for (DXFLayerList::compatibility_iterator node = m_layers.GetFirst(); node; node = node->GetNext())
    {
        DXFLayer *current = node->GetData();
        if (current->name == layer)
            return current->colour;
    }
    return 7;   // white
}

// read two sequential lines
inline void GetLines(wxTextInputStream& text, wxString& line1, wxString& line2)
{
    line1 = text.ReadLine().Trim().Trim(false);
    line2 = text.ReadLine().Trim().Trim(false);
}

// parse header section: just skip everything
bool DXFRenderer::ParseHeader(wxInputStream& stream)
{
    wxTextInputStream text(stream);
    wxString line1, line2;
    while (stream.CanRead())
    {
        GetLines(text, line1, line2);
        if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
            return true;
    }
    return false;
}

// parse tables section: save layers name and colour
bool DXFRenderer::ParseTables(wxInputStream& stream)
{
    wxTextInputStream text(stream);
    wxString line1, line2;
    bool inlayer=false;
    DXFLayer layer;
    while (stream.CanRead())
    {
        GetLines(text, line1, line2);
        if (line1 == wxT("0") && inlayer)
        {
            // flush layer
            if (!layer.name.IsEmpty() && layer.colour != -1)
            {
                DXFLayer *p = new DXFLayer;
                p->name = layer.name;
                p->colour = layer.colour;
                m_layers.Append(p);
            }
            layer = DXFLayer();
            inlayer = false;
        }
        if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
            return true;
        else if (line1 == wxT("0") && line2 == wxT("LAYER"))
            inlayer = true;
        else if (inlayer)
        {
            if (line1 == wxT("2")) // layer name
                layer.name = line2;
            else if (line1 == wxT("62")) // ACI colour
            {
                long l;
                line2.ToLong(&l);
                layer.colour = l;
            }
        }
    }
    return false;
}

// This method is used instead of numStr.ToDouble(d) because the latter
// (wxString::ToDouble()) takes the systems proper locale into account,
// whereas the implementation below works with the default locale.
// (Converting numbers that are formatted in the default locale can fail
//  with system locales that use e.g. the comma as the decimal separator.)
static double ToDouble(const wxString& numStr)
{
    double             d;
    std::string        numStr_(numStr.c_str());
    std::istringstream iss(numStr_);

    iss >> d;

    return d;
}

// parse entities section: save 3DFACE and LINE entities
bool DXFRenderer::ParseEntities(wxInputStream& stream)
{
    wxTextInputStream text(stream);
    wxString line1, line2;
    int state = 0;  // 0: none, 1: 3DFACE, 2: LINE
    DXFVector v[4];
    int colour = -1;
    wxString layer;
    while (stream.CanRead())
    {
        GetLines(text, line1, line2);
        if (line1 == wxT("0") && state > 0)
        {
            // flush entity
            if (state == 1) // 3DFACE
            {
                DXFFace *p = new DXFFace;
                p->v0 = v[0];
                p->v1 = v[1];
                p->v2 = v[2];
                p->v3 = v[3];
                p->CalculateNormal();
                if (colour != -1)
                    p->colour = colour;
                else
                    p->colour = GetLayerColour(layer);
                m_entities.Append(p);
                colour = -1; layer = wxEmptyString;
                v[0] = v[1] = v[2] = v[3] = DXFVector();
                state = 0;
            }
            else if (state == 2) // LINE
            {
                DXFLine *p = new DXFLine;
                p->v0 = v[0];
                p->v1 = v[1];
                if (colour != -1)
                    p->colour = colour;
                else
                    p->colour = GetLayerColour(layer);
                m_entities.Append(p);
                colour = -1; layer = wxEmptyString;
                v[0] = v[1] = v[2] = v[3] = DXFVector();
                state = 0;
            }
        }
        if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
            return true;
        else if (line1 == wxT("0") && line2 == wxT("3DFACE"))
            state = 1;
        else if (line1 == wxT("0") && line2 == wxT("LINE"))
            state = 2;
        else if (state > 0)
        {
            const double d=ToDouble(line2);

            if (line1 == wxT("10"))
                v[0].x = d;
            else if (line1 == wxT("20"))
                v[0].y = d;
            else if (line1 == wxT("30"))
                v[0].z = d;
            else if (line1 == wxT("11"))
                v[1].x = d;
            else if (line1 == wxT("21"))
                v[1].y = d;
            else if (line1 == wxT("31"))
                v[1].z = d;
            else if (line1 == wxT("12"))
                v[2].x = d;
            else if (line1 == wxT("22"))
                v[2].y = d;
            else if (line1 == wxT("32"))
                v[2].z = d;
            else if (line1 == wxT("13"))
                v[3].x = d;
            else if (line1 == wxT("23"))
                v[3].y = d;
            else if (line1 == wxT("33"))
                v[3].z = d;
            else if (line1 == wxT("8"))  // layer
                layer = line2;
            else if (line1 == wxT("62")) // colour
            {
                long l;
                line2.ToLong(&l);
                colour = l;
            }
        }
    }
    return false;
}

// parse and load a DXF file
// currently pretty limited, but knows enought do handle 3DFACEs and LINEs
bool DXFRenderer::Load(wxInputStream& stream)
{
    Clear();
    wxTextInputStream text(stream);

    wxString line1, line2;
    while (stream.CanRead())
    {
        GetLines(text, line1, line2);
        if (line1 == wxT("999")) // comment
            continue;
        else if (line1 == wxT("0") && line2 == wxT("SECTION"))
        {
            GetLines(text, line1, line2);
            if (line1 == wxT("2"))
            {
                if (line2 == wxT("HEADER"))
                {
                    if (!ParseHeader(stream))
                        return false;
                }
                else if (line2 == wxT("TABLES"))
                {
                    if (!ParseTables(stream))
                        return false;
                }
                else if (line2 == wxT("ENTITIES"))
                {
                    if (!ParseEntities(stream))
                        return false;
                }
            }
        }
    }

    NormalizeEntities();
    m_loaded = true;
    return true;
}

inline float mymin(float x, float y) { return x < y ? x : y; }
inline float mymax(float x, float y) { return x > y ? x : y; }

// Scale object boundings to [-5,5]
void DXFRenderer::NormalizeEntities()
{
    // calculate current min and max boundings of object
    DXFVector minv(10e20f, 10e20f, 10e20f);
    DXFVector maxv(-10e20f, -10e20f, -10e20f);
    for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
    {
        DXFEntity *p = node->GetData();
        if (p->type == DXFEntity::Line)
        {
            DXFLine *line = (DXFLine *)p;
            const DXFVector *v[2] = { &line->v0, &line->v1 };
            for (int i = 0; i < 2; ++i)
            {
                minv.x = mymin(v[i]->x, minv.x);
                minv.y = mymin(v[i]->y, minv.y);
                minv.z = mymin(v[i]->z, minv.z);
                maxv.x = mymax(v[i]->x, maxv.x);
                maxv.y = mymax(v[i]->y, maxv.y);
                maxv.z = mymax(v[i]->z, maxv.z);
            }
        } else if (p->type == DXFEntity::Face)
        {
            DXFFace *face = (DXFFace *)p;
            const DXFVector *v[4] = { &face->v0, &face->v1, &face->v2, &face->v3 };
            for (int i = 0; i < 4; ++i)
            {
                minv.x = mymin(v[i]->x, minv.x);
                minv.y = mymin(v[i]->y, minv.y);
                minv.z = mymin(v[i]->z, minv.z);
                maxv.x = mymax(v[i]->x, maxv.x);
                maxv.y = mymax(v[i]->y, maxv.y);
                maxv.z = mymax(v[i]->z, maxv.z);
            }
       }
    }

    // rescale object down to [-5,5]
    DXFVector span(maxv.x - minv.x, maxv.y - minv.y, maxv.z - minv.z);
    float factor = mymin(mymin(10.0f / span.x, 10.0f / span.y), 10.0f / span.z);
    for (DXFEntityList::compatibility_iterator node2 = m_entities.GetFirst(); node2; node2 = node2->GetNext())
    {
        DXFEntity *p = node2->GetData();
        if (p->type == DXFEntity::Line)
        {
            DXFLine *line = (DXFLine *)p;
            DXFVector *v[2] = { &line->v0, &line->v1 };
            for (int i = 0; i < 2; ++i)
            {
                v[i]->x -= minv.x + span.x/2; v[i]->x *= factor;
                v[i]->y -= minv.y + span.y/2; v[i]->y *= factor;
                v[i]->z -= minv.z + span.z/2; v[i]->z *= factor;
            }
        } else if (p->type == DXFEntity::Face)
        {
            DXFFace *face = (DXFFace *)p;
            DXFVector *v[4] = { &face->v0, &face->v1, &face->v2, &face->v3 };
            for (int i = 0; i < 4; ++i)
            {
                v[i]->x -= minv.x + span.x/2; v[i]->x *= factor;
                v[i]->y -= minv.y + span.y/2; v[i]->y *= factor;
                v[i]->z -= minv.z + span.z/2; v[i]->z *= factor;
            }
       }
    }
}

// OpenGL renderer for DXF entities
void DXFRenderer::Render() const
{
    if (!m_loaded)
        return;

    for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
    {
        DXFEntity *p = node->GetData();
        wxColour c = ACIColourToRGB(p->colour);
        if (p->type == DXFEntity::Line)
        {
            DXFLine *line = (DXFLine *)p;
            glBegin(GL_LINES);
            glColor3f(c.Red()/255.0,c.Green()/255.0,c.Blue()/255.0);
            glVertex3f(line->v0.x, line->v0.y, line->v0.z);
            glVertex3f(line->v1.x, line->v1.y, line->v1.z);
            glEnd();
        }
        else if (p->type == DXFEntity::Face)
        {
            DXFFace *face = (DXFFace *)p;
            glBegin(GL_TRIANGLES);
            glColor3f(c.Red()/255.0,c.Green()/255.0,c.Blue()/255.0);
            glNormal3f(face->n.x, face->n.y, face->n.z);
            glVertex3f(face->v0.x, face->v0.y, face->v0.z);
            glVertex3f(face->v1.x, face->v1.y, face->v1.z);
            glVertex3f(face->v2.x, face->v2.y, face->v2.z);
            glEnd();
        }
    }
}
Commit	Line	Data
4b764db3 JS	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: dxfrenderer.cpp
	3	// Purpose: DXF reader and renderer
	4	// Author: Sandro Sigala
	5	// Modified by:
	6	// Created: 2005-11-10
4b764db3 JS	7	// Copyright: (c) Sandro Sigala
	8	// Licence: wxWindows licence
	9	/////////////////////////////////////////////////////////////////////////////
	10
	11	// For compilers that support precompilation, includes "wx/wx.h".
	12	#include "wx/wxprec.h"
	13
	14	#ifdef __BORLANDC__
	15	#pragma hdrstop
	16	#endif
	17
	18	#ifndef WX_PRECOMP
	19	#include "wx/wx.h"
	20	#endif
	21
	22	#include "wx/wfstream.h"
	23	#include "wx/txtstrm.h"
	24
	25	#if !wxUSE_GLCANVAS
	26	#error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
	27	#endif
	28
65f4ce38 VZ	29	#ifdef __DARWIN__
65f4ce38 VZ	30	#include <OpenGL/glu.h>
4b764db3	31	#else
65f4ce38	32	#include <GL/glu.h>
4b764db3 JS	33	#endif
4b764db3 JS	34
451c13c8 VZ	35	#include <sstream>
451c13c8 VZ	36
4b764db3 JS	37	#include "dxfrenderer.h"
4b764db3 JS	38
b20edf8b	39	#include "wx/listimpl.cpp"
412e0d47 DS	40	WX_DEFINE_LIST(DXFEntityList)
412e0d47 DS	41	WX_DEFINE_LIST(DXFLayerList)
4b764db3 JS	42
	43	// Conversion table from AutoCAD ACI colours to RGB values
	44	static const struct { unsigned char r, g, b; } aci_to_rgb[256] = {
490f72fd VZ	45	/* 0 */ {255, 255, 255},
	46	/* 1 */ {255, 0, 0},
	47	/* 2 */ {255, 255, 0},
	48	/* 3 */ { 0, 255, 0},
	49	/* 4 */ { 0, 255, 255},
	50	/* 5 */ { 0, 0, 255},
	51	/* 6 */ {255, 0, 255},
	52	/* 7 */ {255, 255, 255},
	53	/* 8 */ {128, 128, 128},
	54	/* 9 */ {192, 192, 192},
	55	/* 10 */ {255, 0, 0},
	56	/* 11 */ {255, 127, 127},
	57	/* 12 */ {204, 0, 0},
	58	/* 13 */ {204, 102, 102},
	59	/* 14 */ {153, 0, 0},
	60	/* 15 */ {153, 76, 76},
	61	/* 16 */ {127, 0, 0},
	62	/* 17 */ {127, 63, 63},
	63	/* 18 */ { 76, 0, 0},
	64	/* 19 */ { 76, 38, 38},
	65	/* 20 */ {255, 63, 0},
	66	/* 21 */ {255, 159, 127},
	67	/* 22 */ {204, 51, 0},
	68	/* 23 */ {204, 127, 102},
	69	/* 24 */ {153, 38, 0},
	70	/* 25 */ {153, 95, 76},
	71	/* 26 */ {127, 31, 0},
	72	/* 27 */ {127, 79, 63},
	73	/* 28 */ { 76, 19, 0},
	74	/* 29 */ { 76, 47, 38},
	75	/* 30 */ {255, 127, 0},
	76	/* 31 */ {255, 191, 127},
	77	/* 32 */ {204, 102, 0},
	78	/* 33 */ {204, 153, 102},
	79	/* 34 */ {153, 76, 0},
	80	/* 35 */ {153, 114, 76},
	81	/* 36 */ {127, 63, 0},
	82	/* 37 */ {127, 95, 63},
	83	/* 38 */ { 76, 38, 0},
	84	/* 39 */ { 76, 57, 38},
	85	/* 40 */ {255, 191, 0},
	86	/* 41 */ {255, 223, 127},
	87	/* 42 */ {204, 153, 0},
	88	/* 43 */ {204, 178, 102},
	89	/* 44 */ {153, 114, 0},
	90	/* 45 */ {153, 133, 76},
	91	/* 46 */ {127, 95, 0},
	92	/* 47 */ {127, 111, 63},
	93	/* 48 */ { 76, 57, 0},
	94	/* 49 */ { 76, 66, 38},
	95	/* 50 */ {255, 255, 0},
	96	/* 51 */ {255, 255, 127},
	97	/* 52 */ {204, 204, 0},
	98	/* 53 */ {204, 204, 102},
	99	/* 54 */ {153, 153, 0},
	100	/* 55 */ {153, 153, 76},
	101	/* 56 */ {127, 127, 0},
	102	/* 57 */ {127, 127, 63},
	103	/* 58 */ { 76, 76, 0},
	104	/* 59 */ { 76, 76, 38},
	105	/* 60 */ {191, 255, 0},
	106	/* 61 */ {223, 255, 127},
	107	/* 62 */ {153, 204, 0},
	108	/* 63 */ {178, 204, 102},
109	/* 64 */ {114, 153, 0},
110	/* 65 */ {133, 153, 76},
111	/* 66 */ { 95, 127, 0},
112	/* 67 */ {111, 127, 63},
113	/* 68 */ { 57, 76, 0},
114	/* 69 */ { 66, 76, 38},
115	/* 70 */ {127, 255, 0},
116	/* 71 */ {191, 255, 127},
117	/* 72 */ {102, 204, 0},
118	/* 73 */ {153, 204, 102},
119	/* 74 */ { 76, 153, 0},
120	/* 75 */ {114, 153, 76},
121	/* 76 */ { 63, 127, 0},
122	/* 77 */ { 95, 127, 63},
123	/* 78 */ { 38, 76, 0},
124	/* 79 */ { 57, 76, 38},
125	/* 80 */ { 63, 255, 0},
126	/* 81 */ {159, 255, 127},
127	/* 82 */ { 51, 204, 0},
128	/* 83 */ {127, 204, 102},
129	/* 84 */ { 38, 153, 0},
130	/* 85 */ { 95, 153, 76},
131	/* 86 */ { 31, 127, 0},
132	/* 87 */ { 79, 127, 63},
133	/* 88 */ { 19, 76, 0},
134	/* 89 */ { 47, 76, 38},
135	/* 90 */ { 0, 255, 0},
136	/* 91 */ {127, 255, 127},
137	/* 92 */ { 0, 204, 0},
138	/* 93 */ {102, 204, 102},
139	/* 94 */ { 0, 153, 0},
140	/* 95 */ { 76, 153, 76},
141	/* 96 */ { 0, 127, 0},
142	/* 97 */ { 63, 127, 63},
143	/* 98 */ { 0, 76, 0},
144	/* 99 */ { 38, 76, 38},
145	/* 100 */ { 0, 255, 63},
146	/* 101 */ {127, 255, 159},
147	/* 102 */ { 0, 204, 51},
148	/* 103 */ {102, 204, 127},
149	/* 104 */ { 0, 153, 38},
150	/* 105 */ { 76, 153, 95},
151	/* 106 */ { 0, 127, 31},
152	/* 107 */ { 63, 127, 79},
153	/* 108 */ { 0, 76, 19},
154	/* 109 */ { 38, 76, 47},
155	/* 110 */ { 0, 255, 127},
156	/* 111 */ {127, 255, 191},
157	/* 112 */ { 0, 204, 102},
158	/* 113 */ {102, 204, 153},
159	/* 114 */ { 0, 153, 76},
160	/* 115 */ { 76, 153, 114},
161	/* 116 */ { 0, 127, 63},
162	/* 117 */ { 63, 127, 95},
163	/* 118 */ { 0, 76, 38},
164	/* 119 */ { 38, 76, 57},
165	/* 120 */ { 0, 255, 191},
166	/* 121 */ {127, 255, 223},
167	/* 122 */ { 0, 204, 153},
168	/* 123 */ {102, 204, 178},
169	/* 124 */ { 0, 153, 114},
170	/* 125 */ { 76, 153, 133},
171	/* 126 */ { 0, 127, 95},
172	/* 127 */ { 63, 127, 111},
173	/* 128 */ { 0, 76, 57},
174	/* 129 */ { 38, 76, 66},
175	/* 130 */ { 0, 255, 255},
176	/* 131 */ {127, 255, 255},
177	/* 132 */ { 0, 204, 204},
178	/* 133 */ {102, 204, 204},
179	/* 134 */ { 0, 153, 153},
180	/* 135 */ { 76, 153, 153},
181	/* 136 */ { 0, 127, 127},
182	/* 137 */ { 63, 127, 127},
183	/* 138 */ { 0, 76, 76},
184	/* 139 */ { 38, 76, 76},
185	/* 140 */ { 0, 191, 255},
186	/* 141 */ {127, 223, 255},
187	/* 142 */ { 0, 153, 204},
188	/* 143 */ {102, 178, 204},
189	/* 144 */ { 0, 114, 153},
190	/* 145 */ { 76, 133, 153},
191	/* 146 */ { 0, 95, 127},
192	/* 147 */ { 63, 111, 127},
193	/* 148 */ { 0, 57, 76},
194	/* 149 */ { 38, 66, 76},
195	/* 150 */ { 0, 127, 255},
196	/* 151 */ {127, 191, 255},
197	/* 152 */ { 0, 102, 204},
198	/* 153 */ {102, 153, 204},
199	/* 154 */ { 0, 76, 153},
200	/* 155 */ { 76, 114, 153},
201	/* 156 */ { 0, 63, 127},
202	/* 157 */ { 63, 95, 127},
203	/* 158 */ { 0, 38, 76},
204	/* 159 */ { 38, 57, 76},
205	/* 160 */ { 0, 63, 255},
206	/* 161 */ {127, 159, 255},
207	/* 162 */ { 0, 51, 204},
208	/* 163 */ {102, 127, 204},
209	/* 164 */ { 0, 38, 153},
210	/* 165 */ { 76, 95, 153},
211	/* 166 */ { 0, 31, 127},
212	/* 167 */ { 63, 79, 127},
213	/* 168 */ { 0, 19, 76},
214	/* 169 */ { 38, 47, 76},
215	/* 170 */ { 0, 0, 255},
216	/* 171 */ {127, 127, 255},
217	/* 172 */ { 0, 0, 204},
218	/* 173 */ {102, 102, 204},
219	/* 174 */ { 0, 0, 153},
220	/* 175 */ { 76, 76, 153},
221	/* 176 */ { 0, 0, 127},
222	/* 177 */ { 63, 63, 127},
223	/* 178 */ { 0, 0, 76},
224	/* 179 */ { 38, 38, 76},
225	/* 180 */ { 63, 0, 255},
226	/* 181 */ {159, 127, 255},
227	/* 182 */ { 51, 0, 204},
228	/* 183 */ {127, 102, 204},
229	/* 184 */ { 38, 0, 153},
230	/* 185 */ { 95, 76, 153},
231	/* 186 */ { 31, 0, 127},
232	/* 187 */ { 79, 63, 127},
233	/* 188 */ { 19, 0, 76},
234	/* 189 */ { 47, 38, 76},
235	/* 190 */ {127, 0, 255},
236	/* 191 */ {191, 127, 255},
237	/* 192 */ {102, 0, 204},
238	/* 193 */ {153, 102, 204},
239	/* 194 */ { 76, 0, 153},
240	/* 195 */ {114, 76, 153},
241	/* 196 */ { 63, 0, 127},
242	/* 197 */ { 95, 63, 127},
243	/* 198 */ { 38, 0, 76},
244	/* 199 */ { 57, 38, 76},
245	/* 200 */ {191, 0, 255},
246	/* 201 */ {223, 127, 255},
247	/* 202 */ {153, 0, 204},
248	/* 203 */ {178, 102, 204},
249	/* 204 */ {114, 0, 153},
250	/* 205 */ {133, 76, 153},
251	/* 206 */ { 95, 0, 127},
252	/* 207 */ {111, 63, 127},
253	/* 208 */ { 57, 0, 76},
254	/* 209 */ { 66, 38, 76},
255	/* 210 */ {255, 0, 255},
256	/* 211 */ {255, 127, 255},
257	/* 212 */ {204, 0, 204},
258	/* 213 */ {204, 102, 204},
259	/* 214 */ {153, 0, 153},
260	/* 215 */ {153, 76, 153},
261	/* 216 */ {127, 0, 127},
262	/* 217 */ {127, 63, 127},
263	/* 218 */ { 76, 0, 76},
264	/* 219 */ { 76, 38, 76},
265	/* 220 */ {255, 0, 191},
266	/* 221 */ {255, 127, 223},
267	/* 222 */ {204, 0, 153},
268	/* 223 */ {204, 102, 178},
269	/* 224 */ {153, 0, 114},
270	/* 225 */ {153, 76, 133},
271	/* 226 */ {127, 0, 95},
272	/* 227 */ {127, 63, 111},
273	/* 228 */ { 76, 0, 57},
274	/* 229 */ { 76, 38, 66},
275	/* 230 */ {255, 0, 127},
276	/* 231 */ {255, 127, 191},
277	/* 232 */ {204, 0, 102},
278	/* 233 */ {204, 102, 153},
279	/* 234 */ {153, 0, 76},
280	/* 235 */ {153, 76, 114},
281	/* 236 */ {127, 0, 63},
282	/* 237 */ {127, 63, 95},
283	/* 238 */ { 76, 0, 38},
284	/* 239 */ { 76, 38, 57},
285	/* 240 */ {255, 0, 63},
286	/* 241 */ {255, 127, 159},
287	/* 242 */ {204, 0, 51},
288	/* 243 */ {204, 102, 127},
289	/* 244 */ {153, 0, 38},
290	/* 245 */ {153, 76, 95},
291	/* 246 */ {127, 0, 31},
292	/* 247 */ {127, 63, 79},
293	/* 248 */ { 76, 0, 19},
294	/* 249 */ { 76, 38, 47},
295	/* 250 */ { 51, 51, 51},
296	/* 251 */ { 91, 91, 91},
297	/* 252 */ {132, 132, 132},
298	/* 253 */ {173, 173, 173},
299	/* 254 */ {214, 214, 214},
300	/* 255 */ {255, 255, 255}
4b764db3 JS	301	};
	302
	303	inline DXFVector Cross(const DXFVector& v1, const DXFVector& v2)
	304	{
	305	return DXFVector(v1.yv2.z - v1.zv2.y, v1.zv2.x - v1.xv2.z, v1.xv2.y - v1.yv2.x);
	306	}
	307
	308	void DXFFace::CalculateNormal()
	309	{
	310	DXFVector v01, v02;
	311	v01.x = v0.x - v1.x;
	312	v01.y = v0.y - v1.y;
	313	v01.z = v0.z - v1.z;
	314	v02.x = v0.x - v2.x;
	315	v02.y = v0.y - v2.y;
	316	v02.z = v0.z - v2.z;
	317	n = Cross(v01, v02);
	318	float mod = sqrt(n.xn.x + n.yn.y + n.z*n.z);
	319	n.x /= mod;
	320	n.y /= mod;
	321	n.z /= mod;
	322	}
	323
	324	// convert an AutoCAD ACI colour to wxWidgets RGB colour
	325	inline wxColour ACIColourToRGB(int col)
	326	{
	327	wxASSERT(col >= 0 && col <= 255);
	328	return wxColour(aci_to_rgb[col].r, aci_to_rgb[col].g, aci_to_rgb[col].b);
	329	}
	330
	331	// DXFReader constructor
	332	DXFRenderer::DXFRenderer()
	333	{
	334	m_loaded = false;
	335	}
	336
	337	// DXFReader destructor
	338	DXFRenderer::~DXFRenderer()
	339	{
	340	Clear();
	341	}
	342
	343	// deallocate all the dynamic data
	344	void DXFRenderer::Clear()
	345	{
	346	m_loaded = false;
	347	{
490f72fd	348	for (DXFLayerList::compatibility_iterator node = m_layers.GetFirst(); node; node = node->GetNext())
4b764db3 JS	349	{
	350	DXFLayer *current = node->GetData();
	351	delete current;
	352	}
	353	}
	354	m_layers.Clear();
	355	{
490f72fd	356	for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
4b764db3 JS	357	{
	358	DXFEntity *current = node->GetData();
	359	delete current;
	360	}
	361	m_entities.Clear();
	362	}
	363	}
	364
	365	int DXFRenderer::GetLayerColour(const wxString& layer) const
	366	{
490f72fd	367	for (DXFLayerList::compatibility_iterator node = m_layers.GetFirst(); node; node = node->GetNext())
4b764db3 JS	368	{
	369	DXFLayer *current = node->GetData();
	370	if (current->name == layer)
	371	return current->colour;
	372	}
	373	return 7; // white
	374	}
	375
	376	// read two sequential lines
	377	inline void GetLines(wxTextInputStream& text, wxString& line1, wxString& line2)
	378	{
	379	line1 = text.ReadLine().Trim().Trim(false);
	380	line2 = text.ReadLine().Trim().Trim(false);
	381	}
	382
	383	// parse header section: just skip everything
	384	bool DXFRenderer::ParseHeader(wxInputStream& stream)
	385	{
	386	wxTextInputStream text(stream);
	387	wxString line1, line2;
	388	while (stream.CanRead())
	389	{
	390	GetLines(text, line1, line2);
	391	if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
	392	return true;
	393	}
	394	return false;
	395	}
	396
	397	// parse tables section: save layers name and colour
	398	bool DXFRenderer::ParseTables(wxInputStream& stream)
	399	{
	400	wxTextInputStream text(stream);
	401	wxString line1, line2;
	402	bool inlayer=false;
	403	DXFLayer layer;
	404	while (stream.CanRead())
	405	{
	406	GetLines(text, line1, line2);
	407	if (line1 == wxT("0") && inlayer)
	408	{
	409	// flush layer
	410	if (!layer.name.IsEmpty() && layer.colour != -1)
	411	{
	412	DXFLayer *p = new DXFLayer;
	413	p->name = layer.name;
	414	p->colour = layer.colour;
	415	m_layers.Append(p);
	416	}
	417	layer = DXFLayer();
	418	inlayer = false;
	419	}
	420	if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
	421	return true;
	422	else if (line1 == wxT("0") && line2 == wxT("LAYER"))
	423	inlayer = true;
	424	else if (inlayer)
	425	{
	426	if (line1 == wxT("2")) // layer name
	427	layer.name = line2;
	428	else if (line1 == wxT("62")) // ACI colour
	429	{
	430	long l;
	431	line2.ToLong(&l);
432	layer.colour = l;
433	}
434	}
435	}
436	return false;
437	}
438
451c13c8 VZ	439	// This method is used instead of numStr.ToDouble(d) because the latter
	440	// (wxString::ToDouble()) takes the systems proper locale into account,
	441	// whereas the implementation below works with the default locale.
	442	// (Converting numbers that are formatted in the default locale can fail
	443	// with system locales that use e.g. the comma as the decimal separator.)
	444	static double ToDouble(const wxString& numStr)
	445	{
	446	double d;
	447	std::string numStr_(numStr.c_str());
	448	std::istringstream iss(numStr_);
	449
	450	iss >> d;
	451
	452	return d;
	453	}
	454
4b764db3 JS	455	// parse entities section: save 3DFACE and LINE entities
	456	bool DXFRenderer::ParseEntities(wxInputStream& stream)
	457	{
	458	wxTextInputStream text(stream);
	459	wxString line1, line2;
	460	int state = 0; // 0: none, 1: 3DFACE, 2: LINE
	461	DXFVector v[4];
	462	int colour = -1;
	463	wxString layer;
	464	while (stream.CanRead())
	465	{
	466	GetLines(text, line1, line2);
	467	if (line1 == wxT("0") && state > 0)
	468	{
	469	// flush entity
	470	if (state == 1) // 3DFACE
	471	{
	472	DXFFace *p = new DXFFace;
	473	p->v0 = v[0];
	474	p->v1 = v[1];
	475	p->v2 = v[2];
	476	p->v3 = v[3];
	477	p->CalculateNormal();
	478	if (colour != -1)
	479	p->colour = colour;
	480	else
	481	p->colour = GetLayerColour(layer);
	482	m_entities.Append(p);
	483	colour = -1; layer = wxEmptyString;
	484	v[0] = v[1] = v[2] = v[3] = DXFVector();
	485	state = 0;
	486	}
	487	else if (state == 2) // LINE
	488	{
	489	DXFLine *p = new DXFLine;
	490	p->v0 = v[0];
	491	p->v1 = v[1];
	492	if (colour != -1)
	493	p->colour = colour;
	494	else
	495	p->colour = GetLayerColour(layer);
	496	m_entities.Append(p);
	497	colour = -1; layer = wxEmptyString;
	498	v[0] = v[1] = v[2] = v[3] = DXFVector();
	499	state = 0;
	500	}
	501	}
	502	if (line1 == wxT("0") && line2 == wxT("ENDSEC"))
	503	return true;
	504	else if (line1 == wxT("0") && line2 == wxT("3DFACE"))
	505	state = 1;
	506	else if (line1 == wxT("0") && line2 == wxT("LINE"))
	507	state = 2;
	508	else if (state > 0)
	509	{
451c13c8 VZ	510	const double d=ToDouble(line2);
451c13c8 VZ	511
4b764db3 JS	512	if (line1 == wxT("10"))
	513	v[0].x = d;
	514	else if (line1 == wxT("20"))
	515	v[0].y = d;
	516	else if (line1 == wxT("30"))
	517	v[0].z = d;
	518	else if (line1 == wxT("11"))
	519	v[1].x = d;
	520	else if (line1 == wxT("21"))
	521	v[1].y = d;
	522	else if (line1 == wxT("31"))
	523	v[1].z = d;
	524	else if (line1 == wxT("12"))
	525	v[2].x = d;
	526	else if (line1 == wxT("22"))
	527	v[2].y = d;
	528	else if (line1 == wxT("32"))
	529	v[2].z = d;
	530	else if (line1 == wxT("13"))
	531	v[3].x = d;
	532	else if (line1 == wxT("23"))
	533	v[3].y = d;
	534	else if (line1 == wxT("33"))
	535	v[3].z = d;
	536	else if (line1 == wxT("8")) // layer
	537	layer = line2;
	538	else if (line1 == wxT("62")) // colour
	539	{
	540	long l;
	541	line2.ToLong(&l);
	542	colour = l;
	543	}
	544	}
	545	}
	546	return false;
	547	}
	548
	549	// parse and load a DXF file
	550	// currently pretty limited, but knows enought do handle 3DFACEs and LINEs
	551	bool DXFRenderer::Load(wxInputStream& stream)
	552	{
	553	Clear();
	554	wxTextInputStream text(stream);
	555
	556	wxString line1, line2;
	557	while (stream.CanRead())
	558	{
	559	GetLines(text, line1, line2);
	560	if (line1 == wxT("999")) // comment
	561	continue;
	562	else if (line1 == wxT("0") && line2 == wxT("SECTION"))
	563	{
	564	GetLines(text, line1, line2);
	565	if (line1 == wxT("2"))
	566	{
	567	if (line2 == wxT("HEADER"))
	568	{
	569	if (!ParseHeader(stream))
	570	return false;
	571	}
	572	else if (line2 == wxT("TABLES"))
b20edf8b	573	{
4b764db3 JS	574	if (!ParseTables(stream))
	575	return false;
	576	}
	577	else if (line2 == wxT("ENTITIES"))
	578	{
	579	if (!ParseEntities(stream))
	580	return false;
	581	}
	582	}
	583	}
	584	}
	585
	586	NormalizeEntities();
	587	m_loaded = true;
	588	return true;
	589	}
	590
	591	inline float mymin(float x, float y) { return x < y ? x : y; }
	592	inline float mymax(float x, float y) { return x > y ? x : y; }
	593
	594	// Scale object boundings to [-5,5]
	595	void DXFRenderer::NormalizeEntities()
	596	{
	597	// calculate current min and max boundings of object
	598	DXFVector minv(10e20f, 10e20f, 10e20f);
	599	DXFVector maxv(-10e20f, -10e20f, -10e20f);
490f72fd	600	for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
4b764db3 JS	601	{
	602	DXFEntity *p = node->GetData();
	603	if (p->type == DXFEntity::Line)
	604	{
	605	DXFLine line = (DXFLine )p;
	606	const DXFVector *v[2] = { &line->v0, &line->v1 };
	607	for (int i = 0; i < 2; ++i)
	608	{
	609	minv.x = mymin(v[i]->x, minv.x);
	610	minv.y = mymin(v[i]->y, minv.y);
	611	minv.z = mymin(v[i]->z, minv.z);
	612	maxv.x = mymax(v[i]->x, maxv.x);
	613	maxv.y = mymax(v[i]->y, maxv.y);
	614	maxv.z = mymax(v[i]->z, maxv.z);
	615	}
	616	} else if (p->type == DXFEntity::Face)
	617	{
	618	DXFFace face = (DXFFace )p;
	619	const DXFVector *v[4] = { &face->v0, &face->v1, &face->v2, &face->v3 };
	620	for (int i = 0; i < 4; ++i)
	621	{
	622	minv.x = mymin(v[i]->x, minv.x);
	623	minv.y = mymin(v[i]->y, minv.y);
	624	minv.z = mymin(v[i]->z, minv.z);
	625	maxv.x = mymax(v[i]->x, maxv.x);
	626	maxv.y = mymax(v[i]->y, maxv.y);
	627	maxv.z = mymax(v[i]->z, maxv.z);
	628	}
	629	}
	630	}
	631
	632	// rescale object down to [-5,5]
	633	DXFVector span(maxv.x - minv.x, maxv.y - minv.y, maxv.z - minv.z);
	634	float factor = mymin(mymin(10.0f / span.x, 10.0f / span.y), 10.0f / span.z);
490f72fd	635	for (DXFEntityList::compatibility_iterator node2 = m_entities.GetFirst(); node2; node2 = node2->GetNext())
4b764db3 JS	636	{
	637	DXFEntity *p = node2->GetData();
	638	if (p->type == DXFEntity::Line)
	639	{
	640	DXFLine line = (DXFLine )p;
	641	DXFVector *v[2] = { &line->v0, &line->v1 };
	642	for (int i = 0; i < 2; ++i)
	643	{
	644	v[i]->x -= minv.x + span.x/2; v[i]->x *= factor;
	645	v[i]->y -= minv.y + span.y/2; v[i]->y *= factor;
	646	v[i]->z -= minv.z + span.z/2; v[i]->z *= factor;
	647	}
	648	} else if (p->type == DXFEntity::Face)
	649	{
	650	DXFFace face = (DXFFace )p;
	651	DXFVector *v[4] = { &face->v0, &face->v1, &face->v2, &face->v3 };
	652	for (int i = 0; i < 4; ++i)
	653	{
	654	v[i]->x -= minv.x + span.x/2; v[i]->x *= factor;
	655	v[i]->y -= minv.y + span.y/2; v[i]->y *= factor;
	656	v[i]->z -= minv.z + span.z/2; v[i]->z *= factor;
	657	}
	658	}
	659	}
	660	}
	661
	662	// OpenGL renderer for DXF entities
	663	void DXFRenderer::Render() const
	664	{
	665	if (!m_loaded)
	666	return;
	667
490f72fd	668	for (DXFEntityList::compatibility_iterator node = m_entities.GetFirst(); node; node = node->GetNext())
4b764db3 JS	669	{
	670	DXFEntity *p = node->GetData();
	671	wxColour c = ACIColourToRGB(p->colour);
	672	if (p->type == DXFEntity::Line)
	673	{
	674	DXFLine line = (DXFLine )p;
	675	glBegin(GL_LINES);
	676	glColor3f(c.Red()/255.0,c.Green()/255.0,c.Blue()/255.0);
	677	glVertex3f(line->v0.x, line->v0.y, line->v0.z);
	678	glVertex3f(line->v1.x, line->v1.y, line->v1.z);
	679	glEnd();
	680	}
	681	else if (p->type == DXFEntity::Face)
	682	{
	683	DXFFace face = (DXFFace )p;
	684	glBegin(GL_TRIANGLES);
	685	glColor3f(c.Red()/255.0,c.Green()/255.0,c.Blue()/255.0);
	686	glNormal3f(face->n.x, face->n.y, face->n.z);
	687	glVertex3f(face->v0.x, face->v0.y, face->v0.z);
	688	glVertex3f(face->v1.x, face->v1.y, face->v1.z);
	689	glVertex3f(face->v2.x, face->v2.y, face->v2.z);
	690	glEnd();
	691	}
	692	}
	693	}