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wxWidgets/samples/opengl/penguin/dxfrenderer.cpp
Paul Cornett 3aad506c5b Avoid some -Wfloat-conversion warnings
2022-02-13 18:11:55 -08:00

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/////////////////////////////////////////////////////////////////////////////
// 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"
#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 == "0" && line2 == "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 == "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 == "0" && line2 == "ENDSEC")
return true;
else if (line1 == "0" && line2 == "LAYER")
inlayer = true;
else if (inlayer)
{
if (line1 == "2") // layer name
layer.name = line2;
else if (line1 == "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 == "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.clear();
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.clear();
v[0] = v[1] = v[2] = v[3] = DXFVector();
state = 0;
}
}
if (line1 == "0" && line2 == "ENDSEC")
return true;
else if (line1 == "0" && line2 == "3DFACE")
state = 1;
else if (line1 == "0" && line2 == "LINE")
state = 2;
else if (state > 0)
{
const float d = float(ToDouble(line2));
if (line1 == "10")
v[0].x = d;
else if (line1 == "20")
v[0].y = d;
else if (line1 == "30")
v[0].z = d;
else if (line1 == "11")
v[1].x = d;
else if (line1 == "21")
v[1].y = d;
else if (line1 == "31")
v[1].z = d;
else if (line1 == "12")
v[2].x = d;
else if (line1 == "22")
v[2].y = d;
else if (line1 == "32")
v[2].z = d;
else if (line1 == "13")
v[3].x = d;
else if (line1 == "23")
v[3].y = d;
else if (line1 == "33")
v[3].z = d;
else if (line1 == "8") // layer
layer = line2;
else if (line1 == "62") // colour
{
long l;
line2.ToLong(&l);
colour = l;
}
}
}
return false;
}
// parse and load a DXF file
// currently pretty limited, but knows enough to 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 == "999") // comment
continue;
else if (line1 == "0" && line2 == "SECTION")
{
GetLines(text, line1, line2);
if (line1 == "2")
{
if (line2 == "HEADER")
{
if (!ParseHeader(stream))
return false;
}
else if (line2 == "TABLES")
{
if (!ParseTables(stream))
return false;
}
else if (line2 == "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()/255.0f, c.Green()/255.0f, c.Blue()/255.0f);
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()/255.0f, c.Green()/255.0f, c.Blue()/255.0f);
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();
}
}
}
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