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dgnread.cpp
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dgnread.cpp
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/******************************************************************************
* $Id: dgnread.cpp,v 1.55 2006/01/25 19:01:40 kintel Exp $
*
* Project: Microstation DGN Access Library
* Purpose: DGN Access Library element reading code.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2000, Avenza Systems Inc, http://www.avenza.com/
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************
*
* $Log: dgnread.cpp,v $
* Revision 1.55 2006/01/25 19:01:40 kintel
* bugfix: Forgot to convert KnotWeight array from int to float
*
* Revision 1.54 2006/01/25 18:43:19 kintel
* B-Spline curve and surface support
*
* Revision 1.48 2005/11/18 17:43:12 fwarmerdam
* Added text node support in DGNGetRawExtents().
*
* Revision 1.47 2005/11/18 17:16:35 fwarmerdam
* added TextNode implementation from Ilya Beylin
*
* Revision 1.46 2004/06/02 15:53:00 warmerda
* improve divide by zero error checking
*
* Revision 1.45 2004/04/06 04:24:51 warmerda
* Always make any new color table encountered the default color
* table when it is read.
*
* Revision 1.44 2004/01/23 16:15:22 warmerda
* DGN_LEVEL_SYMBOLOGY has no disphdr, DGNParseCore() wont read negative attr
*
* Revision 1.43 2003/11/24 14:17:40 warmerda
* Added a bunch more no-disphdr elements as per email from Marius.
*
* Revision 1.42 2003/11/18 21:11:40 warmerda
* Added DGNElemTypeHasDispHdr() function.
*
* Revision 1.41 2003/11/07 13:59:45 warmerda
* added DGNLoadTCB()
*
* Revision 1.40 2003/09/22 05:59:24 warmerda
* Fixed setting of offset for element index.
* Don't try to extract attribute data on TCB elements.
*
* Revision 1.39 2003/08/19 20:16:56 warmerda
* Added support for reading Cone (23), 3D surface (18) and 3D solid (19)
* elements. Added code to read transformation matrices for Cell headers
* Marius Kintel
*
* Revision 1.38 2003/06/27 14:38:26 warmerda
* avoid warnings
*
* Revision 1.37 2003/05/21 03:42:01 warmerda
* Expanded tabs
*
* Revision 1.36 2003/05/12 18:48:57 warmerda
* added preliminary 3D write support
*
* Revision 1.35 2002/11/13 21:26:32 warmerda
* added more documentation
*
* Revision 1.34 2002/11/12 23:11:52 warmerda
* fixed error with tags in DGNFreeElement()
*
* Revision 1.33 2002/11/12 19:45:27 warmerda
* added support to parse view infos in TCB
*
* Revision 1.32 2002/11/11 20:38:13 warmerda
* provide external extents call, add inverse to int function
*
* Revision 1.31 2002/10/29 19:44:08 warmerda
* fixed complex group handling with spatial queries
*
* Revision 1.30 2002/10/29 19:25:18 warmerda
* fixed serious bug in applying color table to DGNInfo structure
*
* Revision 1.29 2002/09/24 14:34:19 warmerda
* fix collection of background color
*
* Revision 1.28 2002/05/30 19:24:38 warmerda
* add partial support for tag type 5
*
* Revision 1.27 2002/04/22 20:42:40 warmerda
* fixed problem with tag set ids > 255
*
* Revision 1.26 2002/04/08 21:25:59 warmerda
* removed tagDef->id = iTag+1 assumption
*
* Revision 1.25 2002/03/14 21:40:03 warmerda
* expose DGNLoadRawElement, add max_element_count in psDGN
*
* Revision 1.24 2002/03/12 17:11:31 warmerda
* ensure tag elements are indexed
*
* Revision 1.23 2002/03/12 17:07:26 warmerda
* added tagset and tag value element support
*
* Revision 1.22 2002/02/22 22:17:42 warmerda
* Ensure that components of complex chain/shapes are spatially selected
* based on the decision made for their owner (header).
*
* Revision 1.21 2002/02/06 22:39:08 warmerda
* dont filter out non-spatial features with spatial filter
*
* Revision 1.20 2002/02/06 20:32:33 warmerda
* handle improbably large elements
*
* Revision 1.19 2002/01/21 20:53:33 warmerda
* a bunch of reorganization to support spatial filtering
*
* Revision 1.18 2002/01/15 06:38:51 warmerda
* moved some functions to dgnhelp.cpp
*
* Revision 1.17 2001/12/19 15:29:56 warmerda
* added preliminary cell header support
*
* Revision 1.16 2001/11/09 14:55:29 warmerda
* fixed 3D support for arcs
*
* Revision 1.15 2001/09/27 14:28:44 warmerda
* first hack at 3D support
*
* Revision 1.14 2001/08/28 21:27:07 warmerda
* added prototype multi-byte character support
*
* Revision 1.13 2001/08/21 03:01:39 warmerda
* added raw_data support
*
* Revision 1.12 2001/07/18 04:55:16 warmerda
* added CPL_CSVID
*
* Revision 1.11 2001/06/25 15:07:51 warmerda
* Added support for DGNElemComplexHeader
* Don't include elements with the complex bit (such as shared cell definition
* elements) in extents computation for fear they are in a different coord sys.
*
* Revision 1.10 2001/03/07 13:56:44 warmerda
* updated copyright to be held by Avenza Systems
*
* Revision 1.9 2001/03/07 13:52:15 warmerda
* Don't include deleted elements in the total extents.
* Capture attribute data.
*
* Revision 1.7 2001/02/02 22:20:29 warmerda
* compute text height/width properly
*
* Revision 1.6 2001/01/17 16:07:33 warmerda
* ensure that TCB and ColorTable side effects occur on indexing pass too
*
* Revision 1.5 2001/01/16 18:12:52 warmerda
* Added arc support, DGNLookupColor
*
* Revision 1.4 2001/01/10 16:13:45 warmerda
* added docs and extents api
*
* Revision 1.3 2000/12/28 21:28:59 warmerda
* added element index support
*
* Revision 1.2 2000/12/14 17:10:57 warmerda
* implemented TCB, Ellipse, TEXT
*
* Revision 1.1 2000/11/28 19:03:47 warmerda
* New
*
*/
#include "dgnlibp.h"
CPL_CVSID("$Id: dgnread.cpp,v 1.55 2006/01/25 19:01:40 kintel Exp $");
static DGNElemCore *DGNParseTCB( DGNInfo * );
static DGNElemCore *DGNParseColorTable( DGNInfo * );
static DGNElemCore *DGNParseTagSet( DGNInfo * );
static DGNElemCore *DGNParseEqp( DGNInfo * psDGN );
/************************************************************************/
/* DGNGotoElement() */
/************************************************************************/
/**
* Seek to indicated element.
*
* Changes what element will be read on the next call to DGNReadElement().
* Note that this function requires and index, and one will be built if
* not already available.
*
* @param hDGN the file to affect.
* @param element_id the element to seek to. These values are sequentially
* ordered starting at zero for the first element.
*
* @return returns TRUE on success or FALSE on failure.
*/
int DGNGotoElement( DGNHandle hDGN, int element_id )
{
DGNInfo *psDGN = (DGNInfo *) hDGN;
DGNBuildIndex( psDGN );
if( element_id < 0 || element_id >= psDGN->element_count )
return FALSE;
if( VSIFSeek( psDGN->fp, psDGN->element_index[element_id].offset,
SEEK_SET ) != 0 )
return FALSE;
psDGN->next_element_id = element_id;
psDGN->in_complex_group = FALSE;
return TRUE;
}
/************************************************************************/
/* DGNLoadRawElement() */
/************************************************************************/
int DGNLoadRawElement( DGNInfo *psDGN, int *pnType, int *pnLevel )
{
/* -------------------------------------------------------------------- */
/* Read the first four bytes to get the level, type, and word */
/* count. */
/* -------------------------------------------------------------------- */
int nType, nWords, nLevel;
if( VSIFRead( psDGN->abyElem, 1, 4, psDGN->fp ) != 4 )
return FALSE;
/* Is this an 0xFFFF endof file marker? */
if( psDGN->abyElem[0] == 0xff && psDGN->abyElem[1] == 0xff )
return FALSE;
nWords = psDGN->abyElem[2] + psDGN->abyElem[3]*256;
nType = psDGN->abyElem[1] & 0x7f;
nLevel = psDGN->abyElem[0] & 0x3f;
/* -------------------------------------------------------------------- */
/* Read the rest of the element data into the working buffer. */
/* -------------------------------------------------------------------- */
CPLAssert( nWords * 2 + 4 <= (int) sizeof(psDGN->abyElem) );
if( (int) VSIFRead( psDGN->abyElem + 4, 2, nWords, psDGN->fp ) != nWords )
return FALSE;
psDGN->nElemBytes = nWords * 2 + 4;
psDGN->next_element_id++;
/* -------------------------------------------------------------------- */
/* Return requested info. */
/* -------------------------------------------------------------------- */
if( pnType != NULL )
*pnType = nType;
if( pnLevel != NULL )
*pnLevel = nLevel;
return TRUE;
}
/************************************************************************/
/* DGNGetRawExtents() */
/* */
/* Returns FALSE if the element type does not have reconisable */
/* element extents, other TRUE and the extents will be updated. */
/* */
/* It is assumed the raw element data has been loaded into the */
/* working area by DGNLoadRawElement(). */
/************************************************************************/
static int
DGNGetRawExtents( DGNInfo *psDGN, int nType, unsigned char *pabyRawData,
GUInt32 *pnXMin, GUInt32 *pnYMin, GUInt32 *pnZMin,
GUInt32 *pnXMax, GUInt32 *pnYMax, GUInt32 *pnZMax )
{
if( pabyRawData == NULL )
pabyRawData = psDGN->abyElem + 0;
switch( nType )
{
case DGNT_LINE:
case DGNT_LINE_STRING:
case DGNT_SHAPE:
case DGNT_CURVE:
case DGNT_BSPLINE_POLE:
case DGNT_BSPLINE_SURFACE_HEADER:
case DGNT_BSPLINE_CURVE_HEADER:
case DGNT_ELLIPSE:
case DGNT_ARC:
case DGNT_TEXT:
case DGNT_TEXT_NODE:
case DGNT_COMPLEX_CHAIN_HEADER:
case DGNT_COMPLEX_SHAPE_HEADER:
case DGNT_CONE:
case DGNT_3DSURFACE_HEADER:
case DGNT_3DSOLID_HEADER:
*pnXMin = DGN_INT32( pabyRawData + 4 );
*pnYMin = DGN_INT32( pabyRawData + 8 );
if( pnZMin != NULL )
*pnZMin = DGN_INT32( pabyRawData + 12 );
*pnXMax = DGN_INT32( pabyRawData + 16 );
*pnYMax = DGN_INT32( pabyRawData + 20 );
if( pnZMax != NULL )
*pnZMax = DGN_INT32( pabyRawData + 24 );
return TRUE;
default:
return FALSE;
}
}
/************************************************************************/
/* DGNGetElementExtents() */
/************************************************************************/
/**
* Fetch extents of an element.
*
* This function will return the extents of the passed element if possible.
* The extents are extracted from the element header if it contains them,
* and transformed into master georeferenced format. Some element types
* do not have extents at all and will fail.
*
* This call will also fail if the extents raw data for the element is not
* available. This will occur if it was not the most recently read element,
* and if the raw_data field is not loaded.
*
* @param hDGN the handle of the file to read from.
*
* @param psElement the element to extract extents from.
*
* @param psMin structure loaded with X, Y and Z minimum values for the
* extent.
*
* @param psMax structure loaded with X, Y and Z maximum values for the
* extent.
*
* @return TRUE on success of FALSE if extracting extents fails.
*/
int DGNGetElementExtents( DGNHandle hDGN, DGNElemCore *psElement,
DGNPoint *psMin, DGNPoint *psMax )
{
DGNInfo *psDGN = (DGNInfo *) hDGN;
GUInt32 anMin[3], anMax[3];
int bResult;
/* -------------------------------------------------------------------- */
/* Get the extents if we have raw data in the element, or */
/* loaded in the file buffer. */
/* -------------------------------------------------------------------- */
if( psElement->raw_data != NULL )
bResult = DGNGetRawExtents( psDGN, psElement->type,
psElement->raw_data,
anMin + 0, anMin + 1, anMin + 2,
anMax + 0, anMax + 1, anMax + 2 );
else if( psElement->element_id == psDGN->next_element_id - 1 )
bResult = DGNGetRawExtents( psDGN, psElement->type,
psDGN->abyElem + 0,
anMin + 0, anMin + 1, anMin + 2,
anMax + 0, anMax + 1, anMax + 2 );
else
{
CPLError(CE_Warning, CPLE_AppDefined,
"DGNGetElementExtents() fails because the requested element\n"
" does not have raw data available." );
return FALSE;
}
if( !bResult )
return FALSE;
/* -------------------------------------------------------------------- */
/* Transform to user coordinate system and return. The offset */
/* is to convert from "binary offset" form to twos complement. */
/* -------------------------------------------------------------------- */
psMin->x = anMin[0] - 2147483648.0;
psMin->y = anMin[1] - 2147483648.0;
psMin->z = anMin[2] - 2147483648.0;
psMax->x = anMax[0] - 2147483648.0;
psMax->y = anMax[1] - 2147483648.0;
psMax->z = anMax[2] - 2147483648.0;
DGNTransformPoint( psDGN, psMin );
DGNTransformPoint( psDGN, psMax );
return TRUE;
}
/************************************************************************/
/* DGNProcessElement() */
/* */
/* Assumes the raw element data has already been loaded, and */
/* tries to convert it into an element structure. */
/************************************************************************/
static DGNElemCore *DGNProcessElement( DGNInfo *psDGN, int nType, int nLevel )
{
DGNElemCore *psElement = NULL;
/* -------------------------------------------------------------------- */
/* Handle based on element type. */
/* -------------------------------------------------------------------- */
switch( nType )
{
case DGNT_CELL_HEADER:
{
DGNElemCellHeader *psCell;
psCell = (DGNElemCellHeader *)
CPLCalloc(sizeof(DGNElemCellHeader),1);
psElement = (DGNElemCore *) psCell;
psElement->stype = DGNST_CELL_HEADER;
DGNParseCore( psDGN, psElement );
psCell->totlength = psDGN->abyElem[36] + psDGN->abyElem[37] * 256;
DGNRad50ToAscii( psDGN->abyElem[38] + psDGN->abyElem[39] * 256,
psCell->name + 0 );
DGNRad50ToAscii( psDGN->abyElem[40] + psDGN->abyElem[41] * 256,
psCell->name + 3 );
psCell->cclass = psDGN->abyElem[42] + psDGN->abyElem[43] * 256;
psCell->levels[0] = psDGN->abyElem[44] + psDGN->abyElem[45] * 256;
psCell->levels[1] = psDGN->abyElem[46] + psDGN->abyElem[47] * 256;
psCell->levels[2] = psDGN->abyElem[48] + psDGN->abyElem[49] * 256;
psCell->levels[3] = psDGN->abyElem[50] + psDGN->abyElem[51] * 256;
if( psDGN->dimension == 2 )
{
psCell->rnglow.x = DGN_INT32( psDGN->abyElem + 52 );
psCell->rnglow.y = DGN_INT32( psDGN->abyElem + 56 );
psCell->rnghigh.x = DGN_INT32( psDGN->abyElem + 60 );
psCell->rnghigh.y = DGN_INT32( psDGN->abyElem + 64 );
psCell->trans[0] =
1.0 * DGN_INT32( psDGN->abyElem + 68 ) / (1<<31);
psCell->trans[1] =
1.0 * DGN_INT32( psDGN->abyElem + 72 ) / (1<<31);
psCell->trans[2] =
1.0 * DGN_INT32( psDGN->abyElem + 76 ) / (1<<31);
psCell->trans[3] =
1.0 * DGN_INT32( psDGN->abyElem + 80 ) / (1<<31);
psCell->origin.x = DGN_INT32( psDGN->abyElem + 84 );
psCell->origin.y = DGN_INT32( psDGN->abyElem + 88 );
{
double a, b, c, d, a2, c2;
a = DGN_INT32( psDGN->abyElem + 68 );
b = DGN_INT32( psDGN->abyElem + 72 );
c = DGN_INT32( psDGN->abyElem + 76 );
d = DGN_INT32( psDGN->abyElem + 80 );
a2 = a * a;
c2 = c * c;
psCell->xscale = sqrt(a2 + c2) / 214748;
psCell->yscale = sqrt(b*b + d*d) / 214748;
if( (a2 + c2) <= 0.0 )
psCell->rotation = 0.0;
else
psCell->rotation = acos(a / sqrt(a2 + c2));
if (b <= 0)
psCell->rotation = psCell->rotation * 180 / PI;
else
psCell->rotation = 360 - psCell->rotation * 180 / PI;
}
}
else
{
psCell->rnglow.x = DGN_INT32( psDGN->abyElem + 52 );
psCell->rnglow.y = DGN_INT32( psDGN->abyElem + 56 );
psCell->rnglow.z = DGN_INT32( psDGN->abyElem + 60 );
psCell->rnghigh.x = DGN_INT32( psDGN->abyElem + 64 );
psCell->rnghigh.y = DGN_INT32( psDGN->abyElem + 68 );
psCell->rnghigh.z = DGN_INT32( psDGN->abyElem + 72 );
psCell->trans[0] =
1.0 * DGN_INT32( psDGN->abyElem + 76 ) / (1<<31);
psCell->trans[1] =
1.0 * DGN_INT32( psDGN->abyElem + 80 ) / (1<<31);
psCell->trans[2] =
1.0 * DGN_INT32( psDGN->abyElem + 84 ) / (1<<31);
psCell->trans[3] =
1.0 * DGN_INT32( psDGN->abyElem + 88 ) / (1<<31);
psCell->trans[4] =
1.0 * DGN_INT32( psDGN->abyElem + 92 ) / (1<<31);
psCell->trans[5] =
1.0 * DGN_INT32( psDGN->abyElem + 96 ) / (1<<31);
psCell->trans[6] =
1.0 * DGN_INT32( psDGN->abyElem + 100 ) / (1<<31);
psCell->trans[7] =
1.0 * DGN_INT32( psDGN->abyElem + 104 ) / (1<<31);
psCell->trans[8] =
1.0 * DGN_INT32( psDGN->abyElem + 108 ) / (1<<31);
psCell->origin.x = DGN_INT32( psDGN->abyElem + 112 );
psCell->origin.y = DGN_INT32( psDGN->abyElem + 116 );
psCell->origin.z = DGN_INT32( psDGN->abyElem + 120 );
}
DGNTransformPoint( psDGN, &(psCell->rnglow) );
DGNTransformPoint( psDGN, &(psCell->rnghigh) );
DGNTransformPoint( psDGN, &(psCell->origin) );
}
break;
case DGNT_CELL_LIBRARY:
{
DGNElemCellLibrary *psCell;
int iWord;
psCell = (DGNElemCellLibrary *)
CPLCalloc(sizeof(DGNElemCellLibrary),1);
psElement = (DGNElemCore *) psCell;
psElement->stype = DGNST_CELL_LIBRARY;
DGNParseCore( psDGN, psElement );
DGNRad50ToAscii( psDGN->abyElem[32] + psDGN->abyElem[33] * 256,
psCell->name + 0 );
DGNRad50ToAscii( psDGN->abyElem[34] + psDGN->abyElem[35] * 256,
psCell->name + 3 );
psElement->properties = psDGN->abyElem[38]
+ psDGN->abyElem[39] * 256;
psCell->dispsymb = psDGN->abyElem[40] + psDGN->abyElem[41] * 256;
psCell->cclass = psDGN->abyElem[42] + psDGN->abyElem[43] * 256;
psCell->levels[0] = psDGN->abyElem[44] + psDGN->abyElem[45] * 256;
psCell->levels[1] = psDGN->abyElem[46] + psDGN->abyElem[47] * 256;
psCell->levels[2] = psDGN->abyElem[48] + psDGN->abyElem[49] * 256;
psCell->levels[3] = psDGN->abyElem[50] + psDGN->abyElem[51] * 256;
psCell->numwords = psDGN->abyElem[36] + psDGN->abyElem[37] * 256;
memset( psCell->description, 0, sizeof(psCell->description) );
for( iWord = 0; iWord < 9; iWord++ )
{
int iOffset = 52 + iWord * 2;
DGNRad50ToAscii( psDGN->abyElem[iOffset]
+ psDGN->abyElem[iOffset+1] * 256,
psCell->description + iWord * 3 );
}
}
break;
case DGNT_LINE:
{
DGNElemMultiPoint *psLine;
psLine = (DGNElemMultiPoint *)
CPLCalloc(sizeof(DGNElemMultiPoint),1);
psElement = (DGNElemCore *) psLine;
psElement->stype = DGNST_MULTIPOINT;
DGNParseCore( psDGN, psElement );
psLine->num_vertices = 2;
if( psDGN->dimension == 2 )
{
psLine->vertices[0].x = DGN_INT32( psDGN->abyElem + 36 );
psLine->vertices[0].y = DGN_INT32( psDGN->abyElem + 40 );
psLine->vertices[1].x = DGN_INT32( psDGN->abyElem + 44 );
psLine->vertices[1].y = DGN_INT32( psDGN->abyElem + 48 );
}
else
{
psLine->vertices[0].x = DGN_INT32( psDGN->abyElem + 36 );
psLine->vertices[0].y = DGN_INT32( psDGN->abyElem + 40 );
psLine->vertices[0].z = DGN_INT32( psDGN->abyElem + 44 );
psLine->vertices[1].x = DGN_INT32( psDGN->abyElem + 48 );
psLine->vertices[1].y = DGN_INT32( psDGN->abyElem + 52 );
psLine->vertices[1].z = DGN_INT32( psDGN->abyElem + 56 );
}
DGNTransformPoint( psDGN, psLine->vertices + 0 );
DGNTransformPoint( psDGN, psLine->vertices + 1 );
}
break;
case DGNT_LINE_STRING:
case DGNT_SHAPE:
case DGNT_CURVE:
case DGNT_BSPLINE_POLE:
{
DGNElemMultiPoint *psLine;
int i, count;
int pntsize = psDGN->dimension * 4;
count = psDGN->abyElem[36] + psDGN->abyElem[37]*256;
psLine = (DGNElemMultiPoint *)
CPLCalloc(sizeof(DGNElemMultiPoint)+(count-2)*sizeof(DGNPoint),1);
psElement = (DGNElemCore *) psLine;
psElement->stype = DGNST_MULTIPOINT;
DGNParseCore( psDGN, psElement );
if( psDGN->nElemBytes < 38 + count * pntsize )
{
CPLError( CE_Warning, CPLE_AppDefined,
"Trimming multipoint vertices to %d from %d because\n"
"element is short.\n",
(psDGN->nElemBytes - 38) / pntsize,
count );
count = (psDGN->nElemBytes - 38) / pntsize;
}
psLine->num_vertices = count;
for( i = 0; i < psLine->num_vertices; i++ )
{
psLine->vertices[i].x =
DGN_INT32( psDGN->abyElem + 38 + i*pntsize );
psLine->vertices[i].y =
DGN_INT32( psDGN->abyElem + 42 + i*pntsize );
if( psDGN->dimension == 3 )
psLine->vertices[i].z =
DGN_INT32( psDGN->abyElem + 46 + i*pntsize );
DGNTransformPoint( psDGN, psLine->vertices + i );
}
}
break;
case DGNT_TEXT_NODE:
{
DGNElemTextNode *psNode;
psNode = (DGNElemTextNode *) CPLCalloc(sizeof(DGNElemTextNode),1);
psElement = (DGNElemCore *) psNode;
psElement->stype = DGNST_TEXT_NODE;
DGNParseCore( psDGN, psElement );
psNode->totlength = psDGN->abyElem[36] + psDGN->abyElem[37] * 256;
psNode->numelems = psDGN->abyElem[38] + psDGN->abyElem[39] * 256;
psNode->node_number = psDGN->abyElem[40] + psDGN->abyElem[41] * 256;
psNode->max_length = psDGN->abyElem[42];
psNode->max_used = psDGN->abyElem[43];
psNode->font_id = psDGN->abyElem[44];
psNode->justification = psDGN->abyElem[45];
psNode->length_mult = (DGN_INT32( psDGN->abyElem + 50 ))
* psDGN->scale * 6.0 / 1000.0;
psNode->height_mult = (DGN_INT32( psDGN->abyElem + 54 ))
* psDGN->scale * 6.0 / 1000.0;
if( psDGN->dimension == 2 )
{
psNode->rotation = DGN_INT32( psDGN->abyElem + 58 ) / 360000.0;
psNode->origin.x = DGN_INT32( psDGN->abyElem + 62 );
psNode->origin.y = DGN_INT32( psDGN->abyElem + 66 );
}
else
{
/* leave quaternion for later */
psNode->origin.x = DGN_INT32( psDGN->abyElem + 74 );
psNode->origin.y = DGN_INT32( psDGN->abyElem + 78 );
psNode->origin.z = DGN_INT32( psDGN->abyElem + 82 );
}
DGNTransformPoint( psDGN, &(psNode->origin) );
}
break;
case DGNT_GROUP_DATA:
if( nLevel == DGN_GDL_COLOR_TABLE )
{
psElement = DGNParseColorTable( psDGN );
}
else
{
psElement = (DGNElemCore *) CPLCalloc(sizeof(DGNElemCore),1);
psElement->stype = DGNST_CORE;
DGNParseCore( psDGN, psElement );
}
break;
case DGNT_ELLIPSE:
{
DGNElemArc *psEllipse;
psEllipse = (DGNElemArc *) CPLCalloc(sizeof(DGNElemArc),1);
psElement = (DGNElemCore *) psEllipse;
psElement->stype = DGNST_ARC;
DGNParseCore( psDGN, psElement );
memcpy( &(psEllipse->primary_axis), psDGN->abyElem + 36, 8 );
DGN2IEEEDouble( &(psEllipse->primary_axis) );
psEllipse->primary_axis *= psDGN->scale;
memcpy( &(psEllipse->secondary_axis), psDGN->abyElem + 44, 8 );
DGN2IEEEDouble( &(psEllipse->secondary_axis) );
psEllipse->secondary_axis *= psDGN->scale;
if( psDGN->dimension == 2 )
{
psEllipse->rotation = DGN_INT32( psDGN->abyElem + 52 );
psEllipse->rotation = psEllipse->rotation / 360000.0;
memcpy( &(psEllipse->origin.x), psDGN->abyElem + 56, 8 );
DGN2IEEEDouble( &(psEllipse->origin.x) );
memcpy( &(psEllipse->origin.y), psDGN->abyElem + 64, 8 );
DGN2IEEEDouble( &(psEllipse->origin.y) );
}
else
{
/* leave quaternion for later */
memcpy( &(psEllipse->origin.x), psDGN->abyElem + 68, 8 );
DGN2IEEEDouble( &(psEllipse->origin.x) );
memcpy( &(psEllipse->origin.y), psDGN->abyElem + 76, 8 );
DGN2IEEEDouble( &(psEllipse->origin.y) );
memcpy( &(psEllipse->origin.z), psDGN->abyElem + 84, 8 );
DGN2IEEEDouble( &(psEllipse->origin.z) );
psEllipse->quat[0] = DGN_INT32( psDGN->abyElem + 52 );
psEllipse->quat[1] = DGN_INT32( psDGN->abyElem + 56 );
psEllipse->quat[2] = DGN_INT32( psDGN->abyElem + 60 );
psEllipse->quat[3] = DGN_INT32( psDGN->abyElem + 64 );
}
DGNTransformPoint( psDGN, &(psEllipse->origin) );
psEllipse->startang = 0.0;
psEllipse->sweepang = 360.0;
}
break;
case DGNT_ARC:
{
DGNElemArc *psEllipse;
GInt32 nSweepVal;
psEllipse = (DGNElemArc *) CPLCalloc(sizeof(DGNElemArc),1);
psElement = (DGNElemCore *) psEllipse;
psElement->stype = DGNST_ARC;
DGNParseCore( psDGN, psElement );
psEllipse->startang = DGN_INT32( psDGN->abyElem + 36 );
psEllipse->startang = psEllipse->startang / 360000.0;
if( psDGN->abyElem[41] & 0x80 )
{
psDGN->abyElem[41] &= 0x7f;
nSweepVal = -1 * DGN_INT32( psDGN->abyElem + 40 );
}
else
nSweepVal = DGN_INT32( psDGN->abyElem + 40 );
if( nSweepVal == 0 )
psEllipse->sweepang = 360.0;
else
psEllipse->sweepang = nSweepVal / 360000.0;
memcpy( &(psEllipse->primary_axis), psDGN->abyElem + 44, 8 );
DGN2IEEEDouble( &(psEllipse->primary_axis) );
psEllipse->primary_axis *= psDGN->scale;
memcpy( &(psEllipse->secondary_axis), psDGN->abyElem + 52, 8 );
DGN2IEEEDouble( &(psEllipse->secondary_axis) );
psEllipse->secondary_axis *= psDGN->scale;
if( psDGN->dimension == 2 )
{
psEllipse->rotation = DGN_INT32( psDGN->abyElem + 60 );
psEllipse->rotation = psEllipse->rotation / 360000.0;
memcpy( &(psEllipse->origin.x), psDGN->abyElem + 64, 8 );
DGN2IEEEDouble( &(psEllipse->origin.x) );
memcpy( &(psEllipse->origin.y), psDGN->abyElem + 72, 8 );
DGN2IEEEDouble( &(psEllipse->origin.y) );
}
else
{
/* for now we don't try to handle quaternion */
psEllipse->rotation = 0;
memcpy( &(psEllipse->origin.x), psDGN->abyElem + 76, 8 );
DGN2IEEEDouble( &(psEllipse->origin.x) );
memcpy( &(psEllipse->origin.y), psDGN->abyElem + 84, 8 );
DGN2IEEEDouble( &(psEllipse->origin.y) );
memcpy( &(psEllipse->origin.z), psDGN->abyElem + 92, 8 );
DGN2IEEEDouble( &(psEllipse->origin.z) );
psEllipse->quat[0] = DGN_INT32( psDGN->abyElem + 60 );
psEllipse->quat[1] = DGN_INT32( psDGN->abyElem + 64 );
psEllipse->quat[2] = DGN_INT32( psDGN->abyElem + 68 );
psEllipse->quat[3] = DGN_INT32( psDGN->abyElem + 72 );
}
DGNTransformPoint( psDGN, &(psEllipse->origin) );
}
break;
case DGNT_TEXT:
{
DGNElemText *psText;
int num_chars, text_off;
if( psDGN->dimension == 2 )
num_chars = psDGN->abyElem[58];
else
num_chars = psDGN->abyElem[74];
psText = (DGNElemText *) CPLCalloc(sizeof(DGNElemText)+num_chars,1);
psElement = (DGNElemCore *) psText;
psElement->stype = DGNST_TEXT;
DGNParseCore( psDGN, psElement );
psText->font_id = psDGN->abyElem[36];
psText->justification = psDGN->abyElem[37];
psText->length_mult = (DGN_INT32( psDGN->abyElem + 38 ))
* psDGN->scale * 6.0 / 1000.0;
psText->height_mult = (DGN_INT32( psDGN->abyElem + 42 ))
* psDGN->scale * 6.0 / 1000.0;
if( psDGN->dimension == 2 )
{
psText->rotation = DGN_INT32( psDGN->abyElem + 46 );
psText->rotation = psText->rotation / 360000.0;
psText->origin.x = DGN_INT32( psDGN->abyElem + 50 );
psText->origin.y = DGN_INT32( psDGN->abyElem + 54 );
text_off = 60;
}
else
{
/* leave quaternion for later */
psText->origin.x = DGN_INT32( psDGN->abyElem + 62 );
psText->origin.y = DGN_INT32( psDGN->abyElem + 66 );
psText->origin.z = DGN_INT32( psDGN->abyElem + 70 );
text_off = 76;
}
DGNTransformPoint( psDGN, &(psText->origin) );
/* experimental multibyte support from Ason Kang (hiska@netian.com)*/
if (*(psDGN->abyElem + text_off) == 0xFF
&& *(psDGN->abyElem + text_off + 1) == 0xFD)
{
int n=0;
for (int i=0;i<num_chars/2-1;i++) {
unsigned short w;
memcpy(&w,psDGN->abyElem + text_off + 2 + i*2 ,2);
w = CPL_LSBWORD16(w);
if (w<256) { // if alpa-numeric code area : Normal character
*(psText->string + n) = (char) (w & 0xFF);
n++; // skip 1 byte;
}
else { // if extend code area : 2 byte Korean character
*(psText->string + n) = (char) (w >> 8); // hi
*(psText->string + n + 1) = (char) (w & 0xFF); // lo
n+=2; // 2 byte
}
}
psText->string[n] = '\0'; // terminate C string
}
else
{
memcpy( psText->string, psDGN->abyElem + text_off, num_chars );
psText->string[num_chars] = '\0';
}
}
break;
case DGNT_TCB:
psElement = DGNParseTCB( psDGN );
break;
case DGNT_EQP_ELEM:
psElement = DGNParseEqp( psDGN );
break;
case DGNT_COMPLEX_CHAIN_HEADER:
case DGNT_COMPLEX_SHAPE_HEADER:
{
DGNElemComplexHeader *psHdr;
psHdr = (DGNElemComplexHeader *)
CPLCalloc(sizeof(DGNElemComplexHeader),1);
psElement = (DGNElemCore *) psHdr;
psElement->stype = DGNST_COMPLEX_HEADER;
DGNParseCore( psDGN, psElement );
psHdr->totlength = psDGN->abyElem[36] + psDGN->abyElem[37] * 256;
psHdr->numelems = psDGN->abyElem[38] + psDGN->abyElem[39] * 256;
}
break;
case DGNT_TAG_VALUE:
{
DGNElemTagValue *psTag;
psTag = (DGNElemTagValue *)
CPLCalloc(sizeof(DGNElemTagValue),1);
psElement = (DGNElemCore *) psTag;
psElement->stype = DGNST_TAG_VALUE;
DGNParseCore( psDGN, psElement );
psTag->tagType = psDGN->abyElem[74] + psDGN->abyElem[75] * 256;
memcpy( &(psTag->tagSet), psDGN->abyElem + 68, 4 );
psTag->tagSet = CPL_LSBWORD32(psTag->tagSet);
psTag->tagIndex = psDGN->abyElem[72] + psDGN->abyElem[73] * 256;
psTag->tagLength = psDGN->abyElem[150] + psDGN->abyElem[151] * 256;
if( psTag->tagType == 1 )
{
psTag->tagValue.string =
CPLStrdup( (char *) psDGN->abyElem + 154 );
}
else if( psTag->tagType == 3 )
{
memcpy( &(psTag->tagValue.integer),
psDGN->abyElem + 154, 4 );
psTag->tagValue.integer =
CPL_LSBWORD32( psTag->tagValue.integer );
}
else if( psTag->tagType == 4 )
{
memcpy( &(psTag->tagValue.real),
psDGN->abyElem + 154, 8 );
DGN2IEEEDouble( &(psTag->tagValue.real) );
}
}
break;
case DGNT_APPLICATION_ELEM:
if( nLevel == 24 )
{
psElement = DGNParseTagSet( psDGN );
}
else
{
psElement = (DGNElemCore *) CPLCalloc(sizeof(DGNElemCore),1);
psElement->stype = DGNST_CORE;
DGNParseCore( psDGN, psElement );
}
break;
case DGNT_CONE:
{
DGNElemCone *psCone;
psCone = (DGNElemCone *) CPLCalloc(sizeof(DGNElemCone),1);
psElement = (DGNElemCore *) psCone;
psElement->stype = DGNST_CONE;
DGNParseCore( psDGN, psElement );
CPLAssert( psDGN->dimension == 3 );
psCone->unknown = psDGN->abyElem[36] + psDGN->abyElem[37] * 256;
psCone->quat[0] = DGN_INT32( psDGN->abyElem + 38 );
psCone->quat[1] = DGN_INT32( psDGN->abyElem + 42 );
psCone->quat[2] = DGN_INT32( psDGN->abyElem + 46 );
psCone->quat[3] = DGN_INT32( psDGN->abyElem + 50 );
memcpy( &(psCone->center_1.x), psDGN->abyElem + 54, 8 );
DGN2IEEEDouble( &(psCone->center_1.x) );
memcpy( &(psCone->center_1.y), psDGN->abyElem + 62, 8 );
DGN2IEEEDouble( &(psCone->center_1.y) );
memcpy( &(psCone->center_1.z), psDGN->abyElem + 70, 8 );
DGN2IEEEDouble( &(psCone->center_1.z) );
memcpy( &(psCone->radius_1), psDGN->abyElem + 78, 8 );
DGN2IEEEDouble( &(psCone->radius_1) );