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CGM Objects Library
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CGM Objects Library
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The purpose of this library is to read, write and modify ISO standard CGM files regardless of the profile. For more infomration on the CGM Standard refer to ISO/IEC 8632-1. The two key classes to understanding this Library are CCgmObjects and CCgmBaseObj.
The CCgmObjects class contains a list of Picture Elements that are read from a CGM file. This class also contains the CGM attributes for example, Metafile Description, Version, Vdc Extent, Color Table and Fontlist.
The CCgmBaseObj and derived classes are container objects for the individual graphical elements. The CCgmBaseObj will contain attributes common to all graphicsl elements, like line color, line width and fill color. The classes derived from will contain attributes unique to a particular class of element. For example CCgmPoly which is derived from CCgmBasObj is a container class for "poly" type elements like Polyline and Polybezier and will contain the points data along with common attributes inherited from CCgmBaseObj.
The CCgmObjects elements list may also contain Application Structures (CAppStruct) which is an elements list which can contain graphical elements and or other Application Structures in the case of nested APS.
Copyright (c) 2008-2012, Larson Software Technology, Inc.
#include "CgmObjects.h"
#include "CgmObj.h"
#include "Utility\Color.h"
using namespace std;
using namespace Larson;
// Recursivly count number of Application Structures in CCgmObjects elements list
static void CountAps(CElementList* pElements, int* pnAps)
{
for (unsigned int i = 0; i < pElements->m_elements.size(); i++)
{
PicElement elem = pElements->m_elements[i];
if (elem.type == PicElement::AppStruct)
{
// filter out APS types other than "grobject" like "layer, "grnode" or other undefined APS types
if (elem.data.pAppStruct->m_type == L"grobject")
{
*pnAps += 1;
}
// Since APS can be nested, process children of this APS
CountAps(elem.data.pAppStruct, pnAps);
}
}
}
void example()
{
std::wstring inFile = L"allelm01.cgm";
std::wstring outFile = L"allelm01_1.cgm";
// create an application CConfig instance
CConfig *pConfig = new Larson::CConfig();
// create a CgmObjects instance and Load the CGM file
CCgmObjects* pCgmObjects = new CCgmObjects(pConfig, NULL);
// Load the CGM file and return error list
std::vector<CgmInError> errorList;
int error = pCgmObjects->LoadFile(inFile, 1, &errorList);
// Count number of Application structures in CGM file
int nAps = 0;
CountAps(pCgmObjects->m_elements, &nAps);
printf ("Metafile description %s\n", pCgmObjects->m_metafileDescription.c_str());
printf ("Metafile version %d\n", pCgmObjects->m_metafileVersion);
if (error)
return;
for (int i = 0; i < (int)pCgmObjects->m_elements.size(); i++)
{
PicElement elem = pCgmObjects->m_elements[i];
switch (elem.type)
{
case graphical:
{
// graphical element
CCgmBaseObj *pObj = elem.data.pObj;
if (pObj->m_nShape == CCgmBaseObj::text || pObj->m_nShape == CCgmBaseObj::restrictedText)
{
printf ("Text %s\n", ((CCgmText*)pObj)->m_text.c_str());
}
else
{
// make all other elements red
pObj->m_lineColor = CColor(255, 0, 0, 255);
pObj->m_fillColor = CColor(255, 0, 0, 255);
}
}
case APS:
{
// Application Structure
printf ("APS id %s\n", elem.data.pAppStruct->m_id);
}
}
}
// write modified CGM file with default profile, vdcPrecision = 32 bit float, no compression
pCgmObjects->Save(outFile, false, 2, 0, false);
// destroy CCgmObjects and all of it's contents
delete pCgmObjects;
}
Copyright (c) 2008-2012, Larson Software Technology, Inc.
#include "CgmObjects.h"
#include "CgmObj.h"
#include "Utility\Color.h"
#include "DrawGDI.h"
using namespace std;
using namespace Larson;
{
std::wstring inFile = L"allelm01.cgm";
std::wstring userFontsDir = L".";
// given a Window (pWnd) get client window rect and device context
CRect client;
pWnd->GetClientRect(&client);
CDC * pDC = pWnd->GetDC();
Larson::CConfig * pConfig = new CConfig;
// create a CgmObjects instance to hold the CGM
CCgmObjects *pCgmObjects = new CCgmObjects(pConfig);
// Load CGM file
pCgmObjects->LoadFile(inFile, 1);
CDrawGDI *pDB = new CDrawGDI();
// specify Windows Device Context
pDB->setDisplay(pDC->hDC);
pDB->open();
pDB->clear();
// scale to fit client window
DRect viewport = DRect(client.left, client.top, client, client.bottom);
// get CGM VDC extents
DRect window = DRect(pCgmObjects->m_vdcExtent[0].x, pCgmObjects->m_vdcExtent[1].y,
pCgmObjects->m_vdcExtent[1].x, pCgmObjects->m_vdcExtent[0].y);
double vdcWidth = window.Width();
double vdcHeight = window.Height();
double HRatio = vdcWidth / viewport.Width();
double VRatio = vdcHeight / viewport.Height();
Larson::DPoint vdcCenter = window.CenterPoint();
if (HRatio < VRatio)
{
// Scale to fit X axis, Note this is done by Increasing Vdc extent
// to create blank space to left right or both sides of picture
window.left = vdcCenter.x - (viewport.Width() * VRatio / 2);
window.right = vdcCenter.x + (viewport.Width() * VRatio / 2);
}
else
{
// Scale to fit Y axis
window.bottom = vdcCenter.y - (viewport.Height() * HRatio / 2);
window.top = vdcCenter.y + (viewport.Height() * HRatio / 2);
}
// Set the VDC to Device coordnates transform
pDB->setTransform(&window, &viewport, &viewport, 0, CDrawBase::upperLeft);
// Draw CGM elements
pCgmObjects->Draw(pDB, false);
pDB->flush();
pDB->close();
delete pConfig;
delete pDB;
delete pCgmObjects;
}
#include "CgmObjects/CgmObjects.h"
#include "CgmObjects/CgmObj.h"
#include "CgmObjects/MakeCgmObjs.h"
#include "Utility/Color.h"
using namespace std;
using namespace Larson;
std::wstring outFile = L"allelm01_make.cgm";
std::wstring profile = L"WebCGM";
// make an application CConfig instance
CConfig *pConfig = new Larson::CConfig();
// make a CgmObjects instance CGM objects
CCgmObjects* pCgmObjects = new CCgmObjects(pConfig, NULL);
// intialize metafile settings
pCgmObjects->m_scalingMode = CCgmObjects::ScalingMode::scalingModeMetric;
pCgmObjects->m_scalingFactor = 0.1;
// metafile VDC extents
pCgmObjects->m_vdcExtent[0] = Larson::DPoint(0., 0.);
pCgmObjects->m_vdcExtent[1] = Larson::DPoint(1000., 1000.);
pCgmObjects->m_backgroundColor = CColor(255,255,255,255);
// initialize metafile color table
pCgmObjects->m_colorTable[0].color = CColor(255,255,255,255);
pCgmObjects->m_colorTable[0].valid = 1;
pCgmObjects->m_colorTable[1].color = CColor(0,0,0,255);
pCgmObjects->m_colorTable[1].valid = 1;
// make a CGM attribute state list
CCgmAttrState as;
CCgmBaseObj *pObj = NULL;
// change some attributes in state list
as.fillColor = CColor(0,0,255,255);
as.edgeColor = CColor(255,255,0,255);
as.edgeVisible = CCgmBaseObj::edgeVisibleOn;
as.characterHeight = 20;
// make Restricted Text primitives and add each to CGM Objects elements list
pCgmObjects->add(MakeCgmObjs::RestrictedText(450, 20, Larson::DPoint(25,85), true, L"ALLELM01; ATA v2.4; ClrClass:c", pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::RestrictedText(410, 20, Larson::DPoint(25,55), true, L"NIST CGM Interpreter Test Suite", pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::RestrictedText(320, 20, Larson::DPoint(25,25), true, L"Release 3.0, Sept 1998", pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::RestrictedText(90, 66, Larson::DPoint(460,300), true, L"TEXT", pCgmObjects, &as));
// make Polyline primitive and add to CGM Objects elements list
Larson::DPoint polyline[] = { Larson::DPoint(60,260), Larson::DPoint(140,340) };
pCgmObjects->add(MakeCgmObjs::Polyline(&polyline[0], 2, pCgmObjects, &as));
// make Disjoint Polyline (vectors) primitive and add to CGM Objects elements list
Larson::DPoint disjoint[] = { Larson::DPoint(140,260), Larson::DPoint(170,340), Larson::DPoint(210,270), Larson::DPoint(240,340) };
pCgmObjects->add(MakeCgmObjs::DisjointPolyline(&disjoint[0], 4, pCgmObjects, &as));
// make Polymarker primitive and add to CGM Objects elements list
Larson::DPoint polymarker[] = { Larson::DPoint(270,260), Larson::DPoint(300,300), Larson::DPoint(330,330) };
pCgmObjects->add(MakeCgmObjs::Polymarker(&polymarker[0], 3, pCgmObjects, &as));
// make Text primitive and add to CGM Objects elements list
pCgmObjects->add(MakeCgmObjs::Text(Larson::DPoint(360,300), true, L"TEXT", pCgmObjects, &as));
// make Text and an Append Text primitive and add to CGM Objects elements list
pCgmObjects->add(MakeCgmObjs::Text(Larson::DPoint(560,300), false, L"T", pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::AppendText(true, L"EXT", pCgmObjects, &as));
// Polygon point data
Larson::DPoint polygon[] = { Larson::DPoint(660,300), Larson::DPoint(700,260), Larson::DPoint(740,300), Larson::DPoint(700,340) };
pCgmObjects->add(MakeCgmObjs::Polygon(&polygon[0], 4, pCgmObjects, &as));
// Polygon Set point data
Larson::DPoint pgonset[] = { Larson::DPoint(760,300), Larson::DPoint(800,260), Larson::DPoint(840,300), Larson::DPoint(800,340) };
// Polygon Set edge visibilities
CCgmBaseObj::EdgeFlags edgeFlags[] = {
CCgmBaseObj::edgeFlagVisible,
CCgmBaseObj::edgeFlagInvisible,
CCgmBaseObj::edgeFlagVisible,
CCgmBaseObj::edgeFlagVisibleClose
};
// make Polygon Set primitive and add to CGM Objects elements list
pCgmObjects->add(MakeCgmObjs::PolygonSet(&pgonset[0], 4, edgeFlags, pCgmObjects, &as));
// 2 x 2 Cell array color data, each cell is 32 bits per pixel
unsigned long cellarray[] = { 0xff0000ff, 0xff00ff00, 0xffff0000, 0xff00ffff };
// make Cell Array Set primitive and add to CGM Objects elements list
pCgmObjects->add(MakeCgmObjs::CellArray(Larson::DPoint(870,330), Larson::DPoint(930,270), Larson::DPoint(930,330),
2, 2, 32, cellarray, 0, pCgmObjects, &as));
// make Rectangle primitive and add to CGM Objects elements list
pCgmObjects->add(MakeCgmObjs::Rectangle(Larson::DPoint(70,370), Larson::DPoint(130,430), pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::Circle(Larson::DPoint(200,400), 40, pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::CircularArc3Pt(Larson::DPoint(270,430), Larson::DPoint(260,400), Larson::DPoint(270,370),
CCgmBaseObj::arcCloseNone, pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::CircularArc3Pt(Larson::DPoint(370,430), Larson::DPoint(360,400), Larson::DPoint(370,370),
CCgmBaseObj::arcClosePie, pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::CircularArcCenter(Larson::DPoint(500,400), Larson::DPoint(-50,0), Larson::DPoint(0,50),
40, CCgmBaseObj::arcCloseNone, pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::CircularArcCenter(Larson::DPoint(600,400), Larson::DPoint(-50,0), Larson::DPoint(0,50),
40, CCgmBaseObj::arcCloseChord, pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::Ellipse(Larson::DPoint(700,400), Larson::DPoint(650,400), Larson::DPoint(700,430),
pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::EllipticalArc(Larson::DPoint(800,400), Larson::DPoint(750,400), Larson::DPoint(800,430),
Larson::DPoint(0,30), Larson::DPoint(50,0), CCgmBaseObj::arcCloseNone, pCgmObjects, &as));
pCgmObjects->add(MakeCgmObjs::EllipticalArc(Larson::DPoint(900,400), Larson::DPoint(850,400), Larson::DPoint(900,430),
Larson::DPoint(0,30), Larson::DPoint(50,0), CCgmBaseObj::arcClosePie, pCgmObjects, &as));
// make a 1 bit per pixel tile array with a single tile
if(MakeCgmObjs::BeginTileArray(Larson::DPoint(100,900), CCgmBaseObj::cellPathDir0,
CCgmBaseObj::lineProgressionDir270, 1, 1, 128, 128, 0.5, 0.5, 0, 0, 128, 128,
pCgmObjects, &as) == CGMI_NO_ERROR)
{
if(MakeCgmObjs::BiTonalTile(CCgmBaseObj::tileCompressBitmap, 0, CColor(0,0,0,255),
CColor(255,255,255,255), NULL, (void*)tileColors, 2049, pCgmObjects, &as) == CGMI_NO_ERROR)
{
pCgmObjects->add(MakeCgmObjs::EndTileArray(pCgmObjects, &as));
}
}
// make a T6 compressed 1 bit per pixel tile array with a single tile
if(MakeCgmObjs::BeginTileArray(Larson::DPoint(500,900), CCgmBaseObj::cellPathDir0,
CCgmBaseObj::lineProgressionDir270, 1, 1, 1304, 1246, 5., 5., 0, 0, 1304, 1246,
pCgmObjects, &as) == CGMI_NO_ERROR)
{
if(MakeCgmObjs::BiTonalTile(CCgmBaseObj::tileCompressT6, 0, CColor(255,0,0,255),
CColor(0,255,0,255), NULL, (void*)t2, 14464, pCgmObjects, &as) == CGMI_NO_ERROR)
{
pCgmObjects->add(MakeCgmObjs::EndTileArray(pCgmObjects, &as));
}
}
// write CGM file with profile, vdcPrecision = 32 bit float, no compression
CCgmObjects::CGMSaveOptions options;
CGMSaveOptionsInit(&options);
options.profileId = "ATA GRAPHICS.GREXCHANGE";
options.profileEdition = "2.5";
options.description = L"'ColourClass:Colour''Source:Company XYZ, Inc'".
pCgmObjects->Save(outFile, &options);
// destroy CCgmObjects and all of it's contents
delete pCgmObjects; 
1.8.6