void DrawPolygon(clipper::Polygons &pgs)
{
glColor4f(0.0f, 0.0f, 0.0f, 0.4f);
GLUtesselator* tess = gluNewTess();
gluTessCallback(tess, GLU_TESS_BEGIN, (void (CALLBACK*)())&BeginCallback);
gluTessCallback(tess, GLU_TESS_VERTEX, (void (CALLBACK*)())&VertexCallback);
gluTessCallback(tess, GLU_TESS_END, (void (CALLBACK*)())&EndCallback);
gluTessCallback(tess, GLU_TESS_COMBINE, (void (CALLBACK*)())&CombineCallback);
gluTessCallback(tess, GLU_TESS_ERROR, (void (CALLBACK*)())&ErrorCallback);
gluTessProperty(tess, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_NONZERO);
gluTessProperty(tess, GLU_TESS_BOUNDARY_ONLY, GL_FALSE);
gluTessBeginPolygon(tess, NULL);
for (clipper::Polygons::size_type i = 0; i < pgs.size(); ++i)
{
gluTessBeginContour(tess);
for (clipper::Polygon::size_type j = 0; j < pgs[i].size(); ++j)
{
GLdouble *vert = new GLdouble[3];
vert[0] = (GLdouble)pgs[i][j].X;
vert[1] = (GLdouble)pgs[i][j].Y;
vert[2] = 0;
AddToCleanup(vert);
gluTessVertex(tess, vert, vert);
}
gluTessEndContour(tess);
}
gluTessEndPolygon(tess);
DoCleanup();
glColor4f(0.0f, 0.0f, 0.0f, 0.4f);
glLineWidth(1.2f);
gluTessProperty(tess, GLU_TESS_BOUNDARY_ONLY, GL_TRUE); //GL_FALSE
gluTessBeginPolygon(tess, NULL);
for (clipper::Polygons::size_type i = 0; i < pgs.size(); ++i)
{
gluTessBeginContour(tess);
for (clipper::Polygon::size_type j = 0; j < pgs[i].size(); ++j)
{
GLdouble *vert = new GLdouble[3];
vert[0] = (GLdouble)pgs[i][j].X;
vert[1] = (GLdouble)pgs[i][j].Y;
vert[2] = 0;
AddToCleanup(vert);
gluTessVertex(tess, vert, vert);
}
gluTessEndContour(tess);
}
gluTessEndPolygon(tess);
//final cleanup ...
gluDeleteTess(tess);
DoCleanup();
}
void DrawPolygon(clipper::Polygons &pgs, poly_color_type pct)
{
switch (pct)
{
case pctSubject: glColor4f(0.0f, 0.0f, 1.0f, 0.05f); break;
case pctClip: glColor4f(1.0f, 0.0f, 0.0f, 0.05f); break;
default: glColor4f(0.0f, 1.0f, 0.0f, 0.1f);
}
GLUtesselator* tess = gluNewTess();
gluTessCallback(tess, GLU_TESS_BEGIN, (void (CALLBACK*)())&BeginCallback);
gluTessCallback(tess, GLU_TESS_VERTEX, (void (CALLBACK*)())&VertexCallback);
gluTessCallback(tess, GLU_TESS_END, (void (CALLBACK*)())&EndCallback);
gluTessCallback(tess, GLU_TESS_COMBINE, (void (CALLBACK*)())&CombineCallback);
gluTessCallback(tess, GLU_TESS_ERROR, (void (CALLBACK*)())&ErrorCallback);
if (pft == pftEvenOdd)
gluTessProperty(tess, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_ODD); else
gluTessProperty(tess, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_NONZERO);
gluTessProperty(tess, GLU_TESS_BOUNDARY_ONLY, GL_FALSE); //GL_FALSE
gluTessBeginPolygon(tess, NULL);
for (clipper::Polygons::size_type i = 0; i < pgs.size(); ++i)
{
gluTessBeginContour(tess);
for (clipper::Polygon::size_type j = 0; j < pgs[i].size(); ++j)
{
GLdouble *vert = new GLdouble[3];
vert[0] = pgs[i][j].X;
vert[1] = pgs[i][j].Y;
vert[2] = 0;
AddToCleanup(vert);
gluTessVertex(tess, vert, vert);
}
gluTessEndContour(tess);
}
gluTessEndPolygon(tess);
DoCleanup();
switch (pct)
{
case pctSubject: glColor4f(0.0f, 0.0f, 0.3f, 0.3f); break;
case pctClip: glColor4f(0.3f, 0.0f, 0.0f, 0.3f); break;
default: glColor4f(0.0f, 0.2f, 0.0f, 0.5f);
}
if (pct == pctSolution) glLineWidth(1.2f); else glLineWidth(1);
gluTessProperty(tess, GLU_TESS_BOUNDARY_ONLY, GL_TRUE); //GL_FALSE
gluTessBeginPolygon(tess, NULL);
for (clipper::Polygons::size_type i = 0; i < pgs.size(); ++i)
{
gluTessBeginContour(tess);
for (clipper::Polygon::size_type j = 0; j < pgs[i].size(); ++j)
{
GLdouble *vert = new GLdouble[3];
vert[0] = pgs[i][j].X;
vert[1] = pgs[i][j].Y;
vert[2] = 0;
AddToCleanup(vert);
gluTessVertex(tess, vert, vert);
}
gluTessEndContour(tess);
}
gluTessEndPolygon(tess);
//final cleanup ...
gluDeleteTess(tess);
DoCleanup();
}