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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
// DialogWmf.cpp : implementation file
//

#include "stdafx.h"
#include "mesh.h"
#include "DialogWmf.h"

#include "MeshDoc.h"
#include "MeshView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDialogWmf dialog


CDialogWmf::CDialogWmf(CWnd* pParent /*=NULL*/)
	: CDialog(CDialogWmf::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDialogWmf)
	m_Ratio = 30.0;
	m_RatioNbFaces = 0.0f;
	//}}AFX_DATA_INIT
}

CDialogWmf::CDialogWmf(CWnd* pParent,
											 CMeshDoc *pDoc)
	: CDialog(CDialogWmf::IDD, pParent)
{
	m_pDoc = pDoc;
	m_ColorLine = RGB(0,0,0);
	m_ColorFace = RGB(255,255,255);
	m_Mode = MODE_LINE;
	m_Ratio = 30.0;
	m_RatioNbFaces = 1.0f;
}

//*********************************
// OnInitDialog 
//*********************************
BOOL CDialogWmf::OnInitDialog() 
{
	CDialog::OnInitDialog();
	((CButton *)GetDlgItem(IDC_RADIO_LINE))->SetCheck(1);
	((CButton *)GetDlgItem(IDC_RADIO_FACE))->SetCheck(0);
	// CG: The following block was added by the ToolTips component.
	{
		// Create the ToolTip control.
		m_tooltip.Create(this);
		m_tooltip.Activate(TRUE);

		m_tooltip.AddTool(GetDlgItem(IDC_EDIT_RATIO_NBFACES), "Enter the face number ratio (1.0 means that every face are taken into account)");
		m_tooltip.AddTool(GetDlgItem(IDC_EDIT_RATIO), "Select the scaling ratio (30.0 is default)");
		m_tooltip.AddTool(GetDlgItem(IDC_COLOR_FACE), "Click into this frame to select the face color");
		m_tooltip.AddTool(GetDlgItem(IDC_COLOR_LINE), "Click into this frame to select the line color");
		m_tooltip.AddTool(GetDlgItem(IDC_RADIO_FACE), "Faces are sorted according to z, filled and outlined");
		m_tooltip.AddTool(GetDlgItem(IDC_RADIO_LINE), "Edges are painted without sorting nor culling");
	}
	return TRUE;
}


void CDialogWmf::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDialogWmf)
	DDX_Control(pDX, IDC_COLOR_FACE, m_FrameFace);
	DDX_Control(pDX, IDC_COLOR_LINE, m_FrameLine);
	DDX_Text(pDX, IDC_EDIT_RATIO, m_Ratio);
	DDX_Text(pDX, IDC_EDIT_RATIO_NBFACES, m_RatioNbFaces);
	DDV_MinMaxFloat(pDX, m_RatioNbFaces, 1.e-003f, 1.f);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CDialogWmf, CDialog)
	//{{AFX_MSG_MAP(CDialogWmf)
	ON_BN_CLICKED(ID_BUTTON_RUN, OnButtonRun)
	ON_WM_PAINT()
	ON_WM_LBUTTONUP()
	ON_BN_CLICKED(IDC_RADIO_FACE, OnRadioFace)
	ON_BN_CLICKED(IDC_RADIO_LINE, OnRadioLine)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDialogWmf message handlers

//*********************************
// OnButtonRun 
//*********************************
void CDialogWmf::OnButtonRun() 
{
	BeginWaitCursor();

	UpdateData(TRUE);

	// Get DC
	CDC *pDC = m_pDoc->GetView()->GetDC();
	ASSERT(pDC);

	// Get view rect
	CRect rect;
	m_pDoc->GetView()->GetClientRect(&rect);
	rect.InflateRect(5,5);

	// Create metafile device context
	HDC hMetaDC = CreateEnhMetaFile(pDC->m_hDC,"metafile.emf",NULL,NULL);
	if(!hMetaDC)
	{
		AfxMessageBox("Unable to create MetaFile");
		ReleaseDC(pDC);
		return;
	}

	// Get DC from handle
	CDC *pMetaDC = CDC::FromHandle(hMetaDC);
	ASSERT(pMetaDC);
	pMetaDC->SetMapMode(MM_TEXT); 

	// Position / translation / scale
	glPushMatrix();
	CMeshView *pView = (CMeshView *)m_pDoc->GetView();
	glTranslated(pView->m_xTranslation,pView->m_yTranslation,pView->m_zTranslation);
	glRotatef(pView->m_xRotation, 1.0, 0.0, 0.0);
	glRotatef(pView->m_yRotation, 0.0, 1.0, 0.0);
	glRotatef(pView->m_zRotation, 0.0, 0.0, 1.0);
	glScalef(pView->m_xScaling,pView->m_yScaling,pView->m_zScaling);

	// Get OpenGL parameters
	GLdouble modelMatrix[16];
	GLdouble projMatrix[16];
	GLint viewport[4];
	glGetDoublev(GL_MODELVIEW_MATRIX,modelMatrix);
	glGetDoublev(GL_PROJECTION_MATRIX,projMatrix);
	glGetIntegerv(GL_VIEWPORT,viewport);

	// Start rendering via std GDI 2D drawing functions
	CSceneGraph3d *pScene = &m_pDoc->m_SceneGraph;
	for(int i=0;i<pScene->NbObject();i++)
	{
		CObject3d *pObject = pScene->GetAt(i);
		if(pObject->GetType() == TYPE_MESH3D) // meshes only
			// The line mode (no sort)
			if(m_Mode == MODE_LINE) 
				((CMesh3d *)pObject)->glDrawProjectLine(pMetaDC,
				                                        modelMatrix,
																								projMatrix,
																								viewport,
																								m_ColorLine,
																								m_Ratio,
																								rect.Height());
			else 
				// The face mode (faces are z-sorted 
				// according to their barycenter)
				((CMesh3d *)pObject)->glDrawProjectFace(pMetaDC,
				                                        modelMatrix,
																								projMatrix,
																								viewport,
																								m_ColorLine,
																								m_ColorFace,
																								m_Ratio,
																								rect.Height(),
																								m_RatioNbFaces);
	}

	glPopMatrix();

	// Close metafile
	HENHMETAFILE hMetaFile = CloseEnhMetaFile(hMetaDC);

	// Fill the clipboard (direct sent to wmf2eps or 
	// any windows app such as Powerpoint)
	OpenClipboard();
	EmptyClipboard();
	SetClipboardData(CF_ENHMETAFILE,CopyEnhMetaFile(hMetaFile,NULL));
	CloseClipboard();

	// Cleanup
	DeleteEnhMetaFile(hMetaFile);
	ReleaseDC(pDC);

	EndWaitCursor();
}

void CDialogWmf::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	CRect rect;
	CBrush brush;
	
	// Line color
	m_FrameLine.GetWindowRect(&rect);	
	ScreenToClient(&rect);
	brush.CreateSolidBrush(m_ColorLine);
	dc.FillRect(&rect,&brush);
	brush.DeleteObject();

	// Face color
	m_FrameFace.GetWindowRect(&rect);	
	ScreenToClient(&rect);
	brush.CreateSolidBrush(m_ColorFace);
	dc.FillRect(&rect,&brush);
	brush.DeleteObject();
}

//*********************************
// OnLButtonUp 
//*********************************
void CDialogWmf::OnLButtonUp(UINT nFlags, CPoint point) 
{
	CRect rect;

	// Line color
	m_FrameLine.GetWindowRect(&rect);	
	ScreenToClient(&rect);
	if(rect.PtInRect(point))
	{
		CColorDialog dlg(m_ColorLine);
		if(dlg.DoModal()==IDOK)
		{
			m_ColorLine = dlg.GetColor();	
			InvalidateRect(&rect,FALSE);
		}
	}

	// Face color
	m_FrameFace.GetWindowRect(&rect);	
	ScreenToClient(&rect);
	if(rect.PtInRect(point))
	{
		CColorDialog dlg(m_ColorFace);
		if(dlg.DoModal()==IDOK)
		{
			m_ColorFace = dlg.GetColor();	
			InvalidateRect(&rect,FALSE);
		}
	}

	CDialog::OnLButtonUp(nFlags, point);
}

///////////////////////////////////
// Options (face or line)
///////////////////////////////////

//*********************************
// OnRadioFace 
//*********************************
void CDialogWmf::OnRadioFace() 
{
	m_Mode = MODE_FACE;
	((CButton *)GetDlgItem(IDC_RADIO_LINE))->SetCheck(0);
	((CButton *)GetDlgItem(IDC_RADIO_FACE))->SetCheck(1);
}

//*********************************
// OnRadioFace 
//*********************************
void CDialogWmf::OnRadioLine() 
{
	m_Mode = MODE_LINE;
	((CButton *)GetDlgItem(IDC_RADIO_LINE))->SetCheck(1);
	((CButton *)GetDlgItem(IDC_RADIO_FACE))->SetCheck(0);
}



BOOL CDialogWmf::PreTranslateMessage(MSG* pMsg)
{
	// CG: The following block was added by the ToolTips component.
	{
		// Let the ToolTip process this message.
		m_tooltip.RelayEvent(pMsg);
	}
	return CDialog::PreTranslateMessage(pMsg);	// CG: This was added by the ToolTips component.
}

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About the Author

Pierre Alliez

France France
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