strategis::DXFParser Class Reference

Parses DXF files and provides virtual visitors. More...

Inheritance diagram for strategis::DXFParser:

List of all members.

Public Types
enum	EEntityType {   EETPolyline = 1, EETText = 2, EETPoint = 3, EETLWPolyline = 4,   EETInsert = 5 }
	Entity type. More...
enum	ELineType
	Enumeration of line types.
Public Member Functions
virtual void	BlockEnded ()
	Called when a block has ended.
virtual void	BlocksEnded ()
	Called when a block has ended.
virtual void	BlocksStarted ()
	Called when a block has started.
virtual void	BlockStarted ()
	Called when a block has started.
	DXFParser ()
	Ctor.
virtual void	EntitiesEnded ()
	Called when entities section has ended.
virtual void	EntitiesStarted ()
	called when entities section has started
virtual void	EntityEnded ()
	Called when an entity has ended.
virtual void	EntityStarted ()
	Called when an entity has started.
virtual void	HeaderEnded ()
	Called when header has ended.
virtual void	HeaderStarted ()
	Called when header has started.
int	Read (wxString const &filename)
	Call this to start parsing.
virtual void	TableEnded ()
	Called when a table has ended.
virtual void	TablesEnded ()
	Called when table section has ended.
virtual void	TablesStarted ()
	Called when table section has started.
virtual void	TableStarted ()
	Called when a table has started.
virtual	~DXFParser ()
	Dtor.
Static Public Member Functions
static void	ColorIdxToRGB (int idx, unsigned char &r, unsigned char &g, unsigned char &b)
	Called when an INSERT has started.
Static Public Attributes
static wxNode *	cpColorNode
	Current color node.
Protected Attributes
DXFBlock	cBlock
	Last read block.
EEntityType	cEntityType
	Type of last read entity. Defines which of cPoint, cPolyline and cLWPolyline was filled last.
DXFHeader *	cHeader
	Last read header.
std::list< wxString >	cLayerNames
	List of layer names.
DXFLWPolyline *	cLWPolyline
	Last read LW polyline.
DXFVertex	cPoint
	Last read point.
DXFPolyline *	cPolyline
	Last read poly line.
DXFTable *	cTable
	Last read table.
Private Member Functions
void	_Error (char const *pError)
	Notify error.
void	_Parse ()
	Parse the current file.
void	_ParseBlock ()
	Parse all blocks.
void	_ParseBlocks ()
	Parse all blocks.
void	_ParseEntities ()
	Parse all blocks.
void	_ParseHatch ()
	Parse HATCH.
void	_ParseHeader ()
	Parses the header.
void	_ParseInsert ()
	Parse insert entity.
void	_ParseLayer ()
	Parse layer.
void	_ParseLayerName ()
	Parse alyer name.
void	_ParseLine ()
	Parse a line.
void	_ParseLWPolyline ()
	Parse LW Poly line.
void	_ParsePoint ()
void	_ParsePolyline ()
	Parse a poly line.
void	_ParseSection ()
	Parses a section.
void	_ParseSolid ()
	Parse a solid.
void	_ParseTable ()
	Parse a table.
void	_ParseTables ()
	Parse tables.
void	_ParseText ()
	Parse a text.
void	_ParseVariable ()
	Parse some of the header variables.
void	_ParseVertex ()
	Parse a vertex.
void	_ReadPoint (unsigned int const &start=10)
	Reads a 2D or 3D point.
int	GetNext ()
	Reads a pair of cGroup and cValueString from the following two lines.
Private Attributes
unsigned long	cCurrentLine
	Current line number.
unsigned int	cGroup
	The integer group code defining how next line is interpreted.
char	cGroupString [256]
	Helper to get the cGroup.
FILE *	cpFile
	The file being read.
char	cValue [256]
	The string value, if the cGroup indicates that cValueString is of string type.
char	cValueString [256]
	The value at the line after a group code.
Classes
class	DXFBlock
	A DXF block. More...
class	DXFHeader
	DXF Header. More...
class	DXFLayer
	A DXF layer. More...
class	DXFLayerName
	A DXF layer name. More...
class	DXFLWPolyline
	LW (Leight weight?) poly line. More...
class	DXFPoint
	A DXF point. More...
class	DXFPolyline
	A poly line. More...
class	DXFTable
	A DXF table. More...
class	DXFVertex
	A DXF vertex. More...

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Detailed Description

Parses DXF files and provides virtual visitors.

A "SAX" class rather than "DOM" class. Nothing is saved. The class provides hooks to be implemented in sub classes to take actions when different group codes are found.

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Member Enumeration Documentation

enum strategis::DXFParser::EEntityType

Entity type.

Enumerator:

EETPolyline	Polyline.
EETText	Text.
EETPoint	Point.
EETLWPolyline	LWPolyLine.
EETInsert	Insert entity.

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Constructor & Destructor Documentation

strategis::DXFParser::DXFParser

(

)

Ctor.

Sets cHeader, cTable and cPolyline to NULL.

virtual strategis::DXFParser::~DXFParser

(

)

[virtual]

Dtor.

Deltes cHeader, cTable and cPolyline.

---

Member Function Documentation

void strategis::DXFParser::_Parse

(

)

[private]

Parse the current file.

The starting point for parsing a file. Calls _ParseSection for all "SECTION" elements in the file

See also:

Read _ParseSection

void strategis::DXFParser::_ParseBlock

(

)

[private]

Parse all blocks.

• Calls BlockStarted()
• Ends at "ENDSEC" or "SEQEND" or "ENDBLK" or "BLOCK"
• Calls according to table below for entities found
• Reads block name to DXFBlock::cBlockName
• Calls BlockEnded()

Entity found	Calls method
POLYLINE	_ParsePolyline()
POINT	_ParsePoint()
TEXT	_ParseText()
LWPOLYLINE	_ParseLWPolyline()
LINE	_ParseLine()

Todo:

ARC, IMAGE, 3DFACE, an more are not implemented.

See also:

_ParseBlocks

void strategis::DXFParser::_ParseBlocks

(

)

[private]

Parse all blocks.

• Calls BlocksStarted()
• Ends at "ENDSEC" or "SEQEND"
• Skips "BLOCK"
• Calls according to table below for entities found
• Calls BlocksEnded()

Entity found	Calls method
POLYLINE	_ParsePolyline()
POINT	_ParsePoint()
TEXT	_ParseText()
LWPOLYLINE	_ParseLWPolyline()
LINE	_ParseLine()

Todo:

ARC, IMAGE, 3DFACE, an more are not implemented.

See also:

_ParseSection

void strategis::DXFParser::_ParseEntities

(

)

[private]

Parse all blocks.

• Calls EntitiesStarted()
• Ends at "ENDSEC" or "SEQEND"
• Skips "BLOCK"
• Calls according to table below for entities found
• Calls EntitiesEnded()

Entity found	Calls method
POLYLINE	_ParsePolyline()
POINT	_ParsePoint()
TEXT	_ParseText()
LWPOLYLINE	_ParseLWPolyline()
LINE	_ParseLine()

Todo:

ARC, IMAGE, 3DFACE, an more are not implemented.

See also:

_ParseSection

void strategis::DXFParser::_ParseHatch

(

)

[private]

Parse HATCH.

Todo:

Currently only loops until next 0 is found

void strategis::DXFParser::_ParseHeader

(

)

[private]

Parses the header.

• Calls HeaderStarted()
• Calls _ParseVariable() if cGroup is 9. Quits at ENDSEC.
• Calls HeaderEnded()

  See also:

  _ParseSection _ParseVariable

void strategis::DXFParser::_ParseInsert

(

)

[private]

Parse insert entity.

Group code	Action
0	Stop parsing.
10, 20, 30	Read X, Y, Z.
2	Set block name.
8	Set layer name

void strategis::DXFParser::_ParseLayer

(

)

[private]

Parse layer.

Group code	Action
62	Color.
6	Line type
70	Frozen / not frozen
2	Name

See also:

_ParseTable

void strategis::DXFParser::_ParseLayerName

(

)

[private]

Parse alyer name.

Adds layer to DXFParser::cLayerNames if cGroup is 8 and cValue is not already added.

void strategis::DXFParser::_ParseLine

(

)

[private]

Parse a line.

• Calls EntityStarted()
• Parses entity
• Calls EntityEnded()

Group code	Action
0	Return.
10	Read first point
11	Read second point
8	Layer name

void strategis::DXFParser::_ParseLWPolyline

(

)

[private]

Parse LW Poly line.

• Calls EntityStarted()
• Parses entity
• Calls EntityEnded()

Group code	Action
0	Call EntityEnded() and return.
38	Elevation
70	Closed/open, plinegen etc.
90	Number of points
62	Color
10, 20, 30	Point
100	2D/3D
210, 220, 230	Extrusion direction
6	Line type
8	Layer name

void strategis::DXFParser::_ParsePoint

(

)

[private]

Parse a point Parse a solid

• Calls EntityStarted()
• Calls _ReadPoint if cGroup is 10.
• Calls EntityEnded()

void strategis::DXFParser::_ParsePolyline

(

)

[private]

Parse a poly line.

• Calls EntityStarted()
• Parses entity
• Calls EntityEnded()

Group code	Action
0	If "VERTEX", call _ParseVertex(). If "SEQEND", stop.
70	Set if 2D/3D and if closed/open.
62	Set color
6	Set Continuous etc.
8	Set layer name

See also:

_ParseBlocks _ParseEntities

void strategis::DXFParser::_ParseSection

(

)

[private]

Parses a section.

Calls the following methods:

Section found	Calls method
HEADER	_ParseHeader()
TABLES	_ParseTables()
BLOCKS	_ParseBlocks()
ENTITIES	_ParseEntities()

See also:

_Parse

void strategis::DXFParser::_ParseSolid

(

)

[private]

Parse a solid.

• Calls EntityStarted()
• Parses entity
• Calls EntityEnded()

Group code	Action
0	Return.
10	Read first point
11	Read second point
12	Read third point
13	Read fourth point
8	Layer name

void strategis::DXFParser::_ParseTable

(

)

[private]

Parse a table.

• Calls TableStarted()
• Calls _ParseLayer() if DXFParse::cValue is LAYER.
• Calls TableEnded()
• End at ENDTAB

  See also:

  _ParseTables

void strategis::DXFParser::_ParseTables

(

)

[private]

Parse tables.

• Calls TablesStarted()
• Calls TableStarted(), _ParseTable(), and TableEnded() if cGroup is 0 and cValue is "TABLE"
• Calls TablesEnded()

  See also:

  _ParseSection _ParseTable

void strategis::DXFParser::_ParseText

(

)

[private]

Parse a text.

• Calls EntityStarted()
• Parses entity
• Calls EntityEnded()

Group code	Action
0	Return.
10	Read first point
1	Read the text
8	Layer name

void strategis::DXFParser::_ParseVariable

(

)

[private]

Parse some of the header variables.

Parses $EXTMIN, $EXTMAX,$LIMMIN, $LIMMAX, $UCSORG

See also:

_ParseHeader

void strategis::DXFParser::_ParseVertex

(

)

[private]

Parse a vertex.

• Calls EntityStarted()
• Parses entity
• Calls EntityEnded()

Group code	Action
0	Return.
10	Read point
8	Layer name

void strategis::DXFParser::_ReadPoint

(

unsigned int const &

start = 10

)

[private]

Reads a 2D or 3D point.

Reads X at start, Y at start+1, and Z at start+2. Result is stored in DXFParser::cPoint.

Parameters:

start

Points start at multiples of 10, e.g. 10, 20, 30 etc. This varaible stated the start of the point to read

static void strategis::DXFParser::ColorIdxToRGB	(	int	idx,
		unsigned char &	r,
		unsigned char &	g,
		unsigned char &	b
	)			[static]

Called when an INSERT has started.

Called when an INSERT has ended Convert color index to RGB

Todo:

Only assigns random color from a 256-entry palette. Don´t know the actual color table.

See also:

SGIS_Config::GetNextColor

virtual void strategis::DXFParser::EntitiesEnded

(

)

[inline, virtual]

Called when entities section has ended.

The last read entity is stored in internal member for the type

virtual void strategis::DXFParser::EntitiesStarted

(

)

[inline, virtual]

called when entities section has started

See also:

EntityStarted

virtual void strategis::DXFParser::EntityEnded

(

)

[inline, virtual]

Called when an entity has ended.

Last entity is found in DXFParser::cPoint, DXFParser::cPolyline, or DXFParser::cLWPolyline depending on DXFParser::cEntityType.

See also:

EntityStarted

Reimplemented in strategis::DXFLoadGraphics, and strategis::DXF2Arcgen.

virtual void strategis::DXFParser::EntityStarted

(

)

[inline, virtual]

Called when an entity has started.

See also:

EntitiesStarted

virtual void strategis::DXFParser::HeaderEnded

(

)

[inline, virtual]

Called when header has ended.

The last read header is stored in DXFParser::cHeader

Reimplemented in strategis::DXFLoadGraphics.

int strategis::DXFParser::Read

(

wxString const &

filename

)

Call this to start parsing.

Opens the file and calls _Parse().

See also:

_Parse

virtual void strategis::DXFParser::TablesEnded

(

)

[inline, virtual]

Called when table section has ended.

The last read table is stored in DXFParser::cTable

virtual void strategis::DXFParser::TablesStarted

(

)

[inline, virtual]

Called when table section has started.

See also:

TableStarted

virtual void strategis::DXFParser::TableStarted

(

)

[inline, virtual]

Called when a table has started.

See also:

TablesStarted

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The documentation for this class was generated from the following file:

• dxf.h