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Achieving PostScript and Wmf outputs for OpenGL

, 9 Jun 2003
This article explains how to generate resolution independent versions of 3D meshes rendered by OpenGL/MFC programs, i.e. how to export the rendering results to vectorial formats such as encapsulated postscript (EPS) and Windows enhanced metafile (EMF) formats. The main goal consists of being able to
gl_export.zip
Src
Mesh.dsp
Mesh.dsw
Mesh.plg
Mesh.aps
Mesh.clw
Lib3D
res
Mesh.ico
MeshDoc.ico
Toolbar.bmp
Mesh.ncb
Mesh.opt
Bin
knot2.wrl
mnt.wrl
mannequin.wrl
venus.wrl
knot1.wrl
nefertiti.wrl
geosphere.wrl
metafile.emf
Mesh.exe
samples_eps.zip
nefertiti_flat.eps
nefertiti_line_light.eps
nefertiti_line.eps
nefertiti_line_color.eps
nefertiti_smooth_light.eps
nefertiti_line_smooth_light.eps
nefertiti_vertex_color.eps
sample_ppt.zip
sample.ppt
// MeshDoc.cpp : implementation of the CMeshDoc class
//

#include "stdafx.h"
#include "Mesh.h"

#include "MeshDoc.h"
#include "MainFrm.h"
#include "ChildFrm.h"
#include "DialogWmf.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMeshDoc

IMPLEMENT_DYNCREATE(CMeshDoc, CDocument)

BEGIN_MESSAGE_MAP(CMeshDoc, CDocument)
	//{{AFX_MSG_MAP(CMeshDoc)
	ON_COMMAND(ID_GL_ADD_WIREFRAME, OnGlAddWireframe)
	ON_UPDATE_COMMAND_UI(ID_GL_ADD_WIREFRAME, OnUpdateGlAddWireframe)
	ON_COMMAND(ID_GL_SMOOTH, OnGlSmooth)
	ON_UPDATE_COMMAND_UI(ID_GL_SMOOTH, OnUpdateGlSmooth)
	ON_COMMAND(ID_MESH_LOOP, OnMeshLoop)
	ON_UPDATE_COMMAND_UI(ID_MESH_LOOP, OnUpdateMeshLoop)
	ON_COMMAND(ID_GL_LIGHT, OnGlLight)
	ON_COMMAND(ID_GL_LINE, OnGlLine)
	ON_UPDATE_COMMAND_UI(ID_GL_LINE, OnUpdateGlLine)
	ON_UPDATE_COMMAND_UI(ID_GL_LIGHT, OnUpdateGlLight)
	ON_COMMAND(ID_GL_VERTEX, OnGlVertex)
	ON_UPDATE_COMMAND_UI(ID_GL_VERTEX, OnUpdateGlVertex)
	ON_COMMAND(ID_GL_FACE, OnGlFace)
	ON_UPDATE_COMMAND_UI(ID_GL_FACE, OnUpdateGlFace)
	ON_COMMAND(ID_MESH_COLOR_HEIGHT, OnMeshColorHeight)
	ON_COMMAND(ID_EDIT_WMF, OnEditWmf)
	ON_UPDATE_COMMAND_UI(ID_EDIT_WMF, OnUpdateEditWmf)
	ON_COMMAND(ID_GL_CULLING, OnGlCulling)
	ON_UPDATE_COMMAND_UI(ID_GL_CULLING, OnUpdateGlCulling)
	ON_COMMAND(ID_MESH_COLOR_CHOOSE, OnMeshColorChoose)
	ON_UPDATE_COMMAND_UI(ID_MESH_COLOR_CHOOSE, OnUpdateMeshColorChoose)
	ON_UPDATE_COMMAND_UI(ID_MESH_COLOR_HEIGHT, OnUpdateMeshColorHeight)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMeshDoc construction/destruction

CMeshDoc::CMeshDoc()
{
	m_AddWireframe = 0;
	m_Smooth = 0;
	m_PolygonOffset = -1.0f;
	m_Light = TRUE;
	m_Mode = GL_FILL;
	m_Culling = TRUE;
}

CMeshDoc::~CMeshDoc()
{
}

BOOL CMeshDoc::OnNewDocument()
{
	if (!CDocument::OnNewDocument())
		return FALSE;

	// TODO: add reinitialization code here
	// (SDI documents will reuse this document)

	return TRUE;
}



/////////////////////////////////////////////////////////////////////////////
// CMeshDoc serialization

void CMeshDoc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// TODO: add storing code here
	}
	else
	{
		// TODO: add loading code here
	}
}

/////////////////////////////////////////////////////////////////////////////
// CMeshDoc diagnostics

#ifdef _DEBUG
void CMeshDoc::AssertValid() const
{
	CDocument::AssertValid();
}

void CMeshDoc::Dump(CDumpContext& dc) const
{
	CDocument::Dump(dc);
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMeshDoc commands

BOOL CMeshDoc::OnOpenDocument(LPCTSTR lpszPathName) 
{
	// Extension-based checking
	CString file = lpszPathName;

	// Extension
	CString extension = lpszPathName;
	extension = extension.Right(4);
	extension.MakeLower();

	// Path "c:\path\file.wrl" -> c:\path
	CString path = lpszPathName;
	path = path.Left(path.ReverseFind('\\'));

	// CDocument
	SetCurrentDirectory(path);

	TRACE("\nOpening document\n");
	TRACE("File      : %s\n",lpszPathName);
	TRACE("Path      : %s\n",path);
	TRACE("Extension : %s\n",extension);

	// Start reading VRML file
	if(extension == ".wrl")
	{
		TRACE("wrl type\n");
		// Parser VRML 2.0
		CParserVrml parser;
		if(parser.Run((char *)lpszPathName,&m_SceneGraph))
		{
			m_SceneGraph.BuildAdjacency();
			m_SceneGraph.CalculateNormalPerFace();
			m_SceneGraph.CalculateNormalPerVertex();
			m_SceneGraph.SetColorBinding(COLOR_PER_FACE);
			m_SceneGraph.SetNormalBinding(NORMAL_PER_FACE);
			return TRUE;
		}
	}

	return TRUE;
}


//////////////////////////////////////////////
//////////////////////////////////////////////
// RENDERING
//////////////////////////////////////////////
//////////////////////////////////////////////

//***********************************************
// RenderScene
//***********************************************
void CMeshDoc::RenderScene()
{
	// Main drawing
	glPolygonMode(GL_FRONT_AND_BACK,m_Mode);
	if(m_Light)
		::glEnable(GL_LIGHTING);
	else
		::glDisable(GL_LIGHTING);
	m_SceneGraph.glDraw();

	// Add wireframe (no light, and line mode)
	if(m_AddWireframe)
	{
		// Set state
		::glDisable(GL_LIGHTING);
		::glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
		::glEnable(GL_POLYGON_OFFSET_LINE);
		::glPolygonOffset(m_PolygonOffset,-1.0f);

		// Draw again...
		m_SceneGraph.glDraw(TYPE_MESH3D);

		// Restore light and mode
		::glDisable(GL_POLYGON_OFFSET_LINE);
		::glEnable(GL_LIGHTING);
	}

}



//***********************************************
// Smooth subdivision
//***********************************************
void CMeshDoc::OnMeshLoop() 
{
	BeginWaitCursor();
	int NbObject = m_SceneGraph.NbObject();
	for(int i=0;i<NbObject;i++)
	{
		CObject3d *pObject3d = m_SceneGraph[i];
	  if(pObject3d->GetType() == TYPE_MESH3D)
		{
			CMesh3d *pMesh  = (CMesh3d *)pObject3d;
			pMesh->SubdivisionLoop();
		}
	}
	UpdateAllViews(NULL);
	EndWaitCursor();
}
void CMeshDoc::OnUpdateMeshLoop(CCmdUI* pCmdUI) 
{
	pCmdUI->Enable(m_SceneGraph.NbObject() > 0);
}



//*********************************
// OnSaveDocument 
//*********************************
BOOL CMeshDoc::OnSaveDocument(LPCTSTR lpszPathName) 
{
	// Extension
	CString extension = lpszPathName;
	extension = extension.Right(4);
	extension.MakeLower();

	// Path "c:\path\file.wrl" -> c:\path
	CString path = lpszPathName;
	path = path.Left(path.ReverseFind('\\'));

	TRACE("\nSaving document\n");
	TRACE("File      : %s\n",lpszPathName);
	TRACE("Path      : %s\n",path);
	TRACE("Extension : %s\n",extension);

	// Start reading VRML file
	if(extension == ".wrl")
	{
		TRACE("wrl type\n");
		m_SceneGraph.SaveFile((char *)lpszPathName);
	}

	return TRUE;
}

//****************************
// Mode light
//****************************
void CMeshDoc::OnGlLight() 
{
	m_Light = !m_Light;
	UpdateAllViews(NULL);
}
void CMeshDoc::OnUpdateGlLight(CCmdUI* pCmdUI) 
{
	pCmdUI->SetCheck(m_Light);
}

//****************************
// Mode line
//****************************
void CMeshDoc::OnGlLine() 
{
	m_Mode = GL_LINE;
	UpdateAllViews(NULL);
}
void CMeshDoc::OnUpdateGlLine(CCmdUI* pCmdUI) 
{
	pCmdUI->SetCheck(m_Mode == GL_LINE);
}


//****************************
// Mode vertex
//****************************
void CMeshDoc::OnGlVertex() 
{
	m_Mode = GL_POINT;
	UpdateAllViews(NULL);
}
void CMeshDoc::OnUpdateGlVertex(CCmdUI* pCmdUI) 
{
	pCmdUI->SetCheck(m_Mode == GL_POINT);
}

//****************************
// Mode face
//****************************
void CMeshDoc::OnGlFace() 
{
	m_Mode = GL_FILL;
	UpdateAllViews(NULL);
}
void CMeshDoc::OnUpdateGlFace(CCmdUI* pCmdUI) 
{
	pCmdUI->SetCheck(m_Mode == GL_FILL);
}


//***********************************************
// Add wireframe
//***********************************************
void CMeshDoc::OnGlAddWireframe() 
{
	m_AddWireframe = !m_AddWireframe;
	UpdateAllViews(NULL);
}

void CMeshDoc::OnUpdateGlAddWireframe(CCmdUI* pCmdUI) 
{
	pCmdUI->SetCheck(m_AddWireframe);
}

//***********************************************
// Smooth shading
//***********************************************
void CMeshDoc::OnGlSmooth() 
{
	m_Smooth = !m_Smooth;
	if(m_Smooth)
	{
		m_SceneGraph.SetNormalBinding(NORMAL_PER_VERTEX);
		m_SceneGraph.SetColorBinding(COLOR_PER_VERTEX);
		::glShadeModel(GL_SMOOTH);
		m_SceneGraph.BuildAdjacency();
	}
	else
	{
		m_SceneGraph.SetNormalBinding(NORMAL_PER_FACE);
		m_SceneGraph.SetColorBinding(COLOR_PER_FACE);
		::glShadeModel(GL_FLAT);
		m_SceneGraph.BuildAdjacency();
	}
	UpdateAllViews(NULL);
}

void CMeshDoc::OnUpdateGlSmooth(CCmdUI* pCmdUI) 
{
	pCmdUI->SetCheck(m_Smooth);
}

//*********************************
// OnGlCulling 
//*********************************
void CMeshDoc::OnGlCulling() 
{
	m_Culling = !m_Culling;
	if(m_Culling)
		glEnable(GL_CULL_FACE);
	else
		glDisable(GL_CULL_FACE);
	UpdateAllViews(NULL);
}
void CMeshDoc::OnUpdateGlCulling(CCmdUI* pCmdUI) 
{
	pCmdUI->SetCheck(m_Culling);
}

//*********************************
// OnMeshColorHeight 
//*********************************
void CMeshDoc::OnMeshColorHeight() 
{
	// Rainbow height ramp
	CColorRamp ramp;
	ramp.BuildRainbow();
	((CMesh3d *)m_SceneGraph.GetAt(0))->ColorHeight(&ramp);
	UpdateAllViews(NULL);
}
void CMeshDoc::OnUpdateMeshColorHeight(CCmdUI* pCmdUI) 
{
	int enable = FALSE;
	if(m_SceneGraph.NbObject())
		if(m_SceneGraph.GetAt(0)->GetType() == TYPE_MESH3D)
			enable = TRUE;
	pCmdUI->Enable(enable);
}

//*********************************
// GetView
//*********************************
CView *CMeshDoc::GetView() 
{
	CMDIFrameWnd *pFrame = (CMDIFrameWnd*)AfxGetApp()->m_pMainWnd;
	
	// Get the active MDI child window.
	CMDIChildWnd *pChild = pFrame->MDIGetActive();
	
	// Get the active view attached to the active MDI child
	// window.
	return pChild->GetActiveView();
}

//*********************************
// OnEditWmf 
//*********************************
void CMeshDoc::OnEditWmf() 
{
	CDialogWmf dlg(NULL,this);
	dlg.DoModal();
}

void CMeshDoc::OnUpdateEditWmf(CCmdUI* pCmdUI) 
{
	pCmdUI->Enable(m_SceneGraph.NbObject() > 0);
}


//*********************************
// OnMeshColorChoose 
//*********************************
void CMeshDoc::OnMeshColorChoose() 
{
	CColorDialog dlg;
	if(dlg.DoModal() == IDOK)
	{
		COLORREF color = dlg.GetColor();
		unsigned char r = GetRValue(color);
		unsigned char g = GetGValue(color);
		unsigned char b = GetBValue(color);
		unsigned int NbObject = m_SceneGraph.NbObject();
		for(unsigned int i=0; i<NbObject; i++)
		{
			CObject3d *pObject3d = m_SceneGraph.GetAt(i);
			if(pObject3d->GetType() == TYPE_MESH3D)
				((CMesh3d *)pObject3d)->SetColor(r,g,b);
		}
		UpdateAllViews(NULL);
	}
}
void CMeshDoc::OnUpdateMeshColorChoose(CCmdUI* pCmdUI) 
{
	pCmdUI->Enable(m_SceneGraph.NbObject() > 0);
}

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About the Author

Pierre Alliez

France France
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