vgfx is the Vector Graphics Engine. More...

Collaboration diagram for Vector Graphics Engine:

Classes
class	vgfx::Drawer
	Clients must implement this if they want to draw. More...
class	vgfx::Request
	used to easily construct vgfx Requests More...
struct	vgfx::visit_result_t
	hit detection results More...
class	vgfx::Primitive
	the base class from which all vector graphics objects inherit. More...
class	vgfx::ObjectMap
	an ObjectMap is a physical manifestation of a vector graphics 2D area. More...
struct	vgfx::init_primitive_t
struct	vgfx::init_point_t
struct	vgfx::init_bezier_t
struct	vgfx::init_rect_t
struct	vgfx::init_line_t
struct	vgfx::init_dxdy_t
struct	vgfx::init_quad_t
struct	vgfx::init_text_t
Namespaces
namespace	vgfx
Modules
	vgfx Request Format
	This is a description of the vector graphics engine request format.
Typedefs
typedef point2d_t< float >	vgfx::point_t
typedef rect2d_t< float >	vgfx::rect_t
typedef bool(*	vgfx::callback_t )(void *context, visit_result_t &result)
Enumerations
enum	vgfx::eHitDetect { vgfx::eHit_Overlap = 1, vgfx::eHit_Contained = 2, vgfx::eHit_Always = 3, vgfx::eHit_Invalid = 0 }
	hit detection results More...
Functions
void	vgfx::visit_result_t::clear (void) throw ()
virtual	vgfx::Primitive::~Primitive (void) throw ()
virtual long	vgfx::Primitive::getRefCount (void) const throw ()
virtual void	vgfx::Primitive::incrementRefCount (void) throw ()
virtual void	vgfx::Primitive::decrementRefCount (void) throw ()
virtual const char *	vgfx::Primitive::getID (void) const throw ()
virtual void	vgfx::Primitive::setID (const char *id)
virtual const char *	vgfx::Primitive::getType (void) const =0 throw ()
virtual void	vgfx::Primitive::persist (std::ostream &stream) const =0
virtual void	vgfx::Primitive::listContainers (const VecString &path, VecString &ids) const
virtual bool	vgfx::Primitive::doesContainerExist (const VecString &path) const
virtual bool	vgfx::Primitive::canCreateContainer (const VecString &path) const
virtual void	vgfx::Primitive::removeContainer (const VecString &path)
virtual void	vgfx::Primitive::getContainerDictionary (const VecString &path, dictionary_t &data) const
virtual void	vgfx::Primitive::setContainerDictionary (const VecString &path, const dictionary_t &data)
virtual void	vgfx::Primitive::recalcBoundingRect (const char tag_path, Drawer drawer, const xform_2d_t &T)=0
virtual bool	vgfx::Primitive::getBoundingRect (rect_t &r) const =0 throw ()
virtual bool	vgfx::Primitive::getPrimitive (const char *tag_path, const xform_2d_t &T, visit_result_t &vr)
virtual void	vgfx::Primitive::draw (Drawer *drawer, const rect_t &r_pix, const xform_2d_t &T)=0
	draw this primitive and all children, recursively
virtual bool	vgfx::Primitive::visit (const rect_t &r, const xform_2d_t &T, const char tag_path, callback_t callback, void context, eHitDetect hit)
static smart_ptr< Primitive >	vgfx::Primitive::create (const char *type, const dictionary_t &data)
virtual long	vgfx::ObjectMap::size (void) const =0 throw ()
virtual void	vgfx::ObjectMap::newObjectID (const char *prefix, std::string &id)=0
virtual void	vgfx::ObjectMap::addObject (smart_ptr< Primitive > &primitive)=0
virtual Primitive *	vgfx::ObjectMap::findObject (const char *ID) const =0 throw ()
virtual smart_ptr< Primitive >	vgfx::ObjectMap::removeObject (const char *ID)=0
static smart_ptr< ObjectMap >	vgfx::ObjectMap::create (void)
bool	vgfx::processRequest (ObjectMap *map,std::istream &stream,bool single_transaction,std::string &undo_request,std::string &diagnostic)
	Request that an ObjectMap be updated with the given request.
void	vgfx::invokeFunction (Primitive in_function, ObjectMap map, const dictionary_t &in_params, std::ostream &out)
Primitive *	vgfx::addFunctionFromPath (ObjectMap map, const char path)
void	vgfx::setScript (ObjectMap map, const char parent_id, const char *script_id, const objtree::property_set_t &pset_def, std::ostream &stream, std::string &root)
void	vgfx::updateScriptParameters (ObjectMap map, const char parent_id, const objtree::property_set_t &pset, std::ostream &stream)
void	vgfx::resizeScript (ObjectMap map, const char parent_id, float width, float height, std::ostream &stream)
template<class T >
std::string	vgfx::getStringValue (const T &t)
void	vgfx::init_point_from_data (const dictionary_t &data, init_point_t &)
smart_ptr< Primitive >	vgfx::create_point (const init_point_t &)
void	vgfx::init_bezier_from_data (const dictionary_t &data, init_bezier_t &init)
smart_ptr< Primitive >	vgfx::create_bezier (const init_bezier_t &init)
void	vgfx::init_rect_from_data (const dictionary_t &data, init_rect_t &init)
smart_ptr< Primitive >	vgfx::create_rect (const init_rect_t &init)
void	vgfx::init_line_from_data (const dictionary_t &data, init_line_t &init)
smart_ptr< Primitive >	vgfx::create_line (const init_line_t &init)
void	vgfx::init_dxdy_from_data (const dictionary_t &data, init_dxdy_t &)
smart_ptr< Primitive >	vgfx::create_dxdy (const init_dxdy_t &)
void	vgfx::init_quad_from_data (const dictionary_t &data, init_quad_t &init)
smart_ptr< Primitive >	vgfx::create_quad (const init_quad_t &init)
smart_ptr< Primitive >	vgfx::parseGroup (std::istream &stream, ObjectMap *map)
smart_ptr< Primitive >	vgfx::parseFunction (std::istream &stream, ObjectMap *map)
void	vgfx::init_text_from_data (const dictionary_t &data, init_text_t &init)
smart_ptr< Primitive >	vgfx::create_text (const init_text_t &init)
Variables
Primitive *	vgfx::visit_result_t::p
const char *	vgfx::visit_result_t::tag_path
xform_2d_t	vgfx::visit_result_t::T
long	vgfx::Primitive::m_refcount
std::string	vgfx::Primitive::m_id
float	vgfx::init_point_t::y0
bool	vgfx::init_rect_t::fill
float	vgfx::init_line_t::y0
float	vgfx::init_line_t::x1
float	vgfx::init_line_t::y1
float	vgfx::init_dxdy_t::dy

enum	vgfx::eBrushAttribute { vgfx::eBrush_PenColor = 1, vgfx::eBrush_FillColor = 2, vgfx::eBrush_PenThickness = 3, vgfx::eBrush_Font = 50, vgfx::eBrush_TextFlags = 60, vgfx::eBrush_Invalid = 0 }

Detailed Description

vgfx is the Vector Graphics Engine.

It exists to represent the logical model of nested, transformed 2D shapes.

The library is heavily optimized for two use cases:

atomic, transactional updates (writes)
very fast queries (reads)

In particular, the library doesn't try to be particularly fast on writes. It is more concerned with correctness (of course), and with constructing a rollback request for internal and external use.

Because any write operation returns a corresponding rollback request, it is easy for calling applications to set up an undo/redo stack.

The request language is intended to be human-readable and easy for applications to generate on the fly. Think of something like SQL updates.

Queries are focused on either lookups by object ID, or lookups based on a 2D rectangle. Reads (queries) are intended to be fast so the engine can be used in a real-time rendering application.

Typical client usage is:

create an ObjectMap to represent your state
construct requests (text statements) - see vgfx Request Format
call processRequest() to invoke requests on your ObjectMap (this will populate and modify the map)
call various ObjectMap or Primitive APIs to query the state of any interesting objects.

If you want to draw any of this:

provide an object that implements the vgfx::Drawer interface
use the vgfx::Primitive::draw() method to recursively draw nested object trees.

Keep in mind: an ObjectMap isn't actually a canvas! Think of it as a big registry of objects which you can look up by name (ID). And objects can reference each other by their IDs.

To draw something, you have to provide an object to draw. Typically an application will create a bunch of objects in the ObjectMap, and then put everything visible under a known root group object. For display, the application will call draw() on the root group object. (To do this, the application will have to create an object that implements the Drawer interface, and then call vgfx::Primitive::draw() on the root group object).

Other descriptions of vgfx (mostly for search engines):

scriptable vector graphics engine
transactional vector graphics engine
queriable vector graphics engine
programmable vector graphics engine

Typedef Documentation

typedef point2d_t<float> vgfx::point_t

Definition at line 116 of file vgfx.h.

typedef rect2d_t<float> vgfx::rect_t

Definition at line 117 of file vgfx.h.

typedef bool(* vgfx::callback_t)(void *context,visit_result_t &result)

Definition at line 151 of file vgfx.h.

Enumeration Type Documentation

enum vgfx::eBrushAttribute

Enumerator:

eBrush_PenColor
eBrush_FillColor
eBrush_PenThickness
eBrush_Font
eBrush_TextFlags
eBrush_Invalid

Definition at line 46 of file vgfx/drawer.h.

enum vgfx::eHitDetect

hit detection results

Enumerator:

eHit_Overlap	rects overlap at all
eHit_Contained	counts as a hit only if contained
eHit_Always	ignore rect, always hit
eHit_Invalid

Definition at line 124 of file vgfx.h.

Function Documentation

void vgfx::visit_result_t::clear ( void ) throw () [inline, inherited]

Definition at line 138 of file vgfx.h.

vgfx::Primitive::~Primitive ( void ) throw () [virtual, inherited]

Definition at line 53 of file vgfx.cpp.

virtual long vgfx::Primitive::getRefCount ( void ) const throw () [inline, virtual, inherited]

Definition at line 163 of file vgfx.h.

virtual void vgfx::Primitive::incrementRefCount ( void ) throw () [inline, virtual, inherited]

Definition at line 164 of file vgfx.h.

virtual void vgfx::Primitive::decrementRefCount ( void ) throw () [inline, virtual, inherited]

Definition at line 169 of file vgfx.h.

const char * vgfx::Primitive::getID ( void ) const throw () [virtual, inherited]

Definition at line 64 of file vgfx.cpp.

void vgfx::Primitive::setID ( const char * id ) [virtual, inherited]

Definition at line 75 of file vgfx.cpp.

virtual const char* vgfx::Primitive::getType ( void ) const throw () [pure virtual, inherited]

virtual void vgfx::Primitive::persist ( std::ostream & stream ) const [pure virtual, inherited]

void vgfx::Primitive::listContainers	(	const VecString &	path,
		VecString &	ids
	)			const `[virtual, inherited]`

Definition at line 87 of file vgfx.cpp.

bool vgfx::Primitive::doesContainerExist ( const VecString & path ) const [virtual, inherited]

Definition at line 101 of file vgfx.cpp.

bool vgfx::Primitive::canCreateContainer ( const VecString & path ) const [virtual, inherited]

Definition at line 113 of file vgfx.cpp.

void vgfx::Primitive::removeContainer ( const VecString & path ) [virtual, inherited]

Definition at line 125 of file vgfx.cpp.

void vgfx::Primitive::getContainerDictionary	(	const VecString &	path,
		dictionary_t &	data
	)			const `[virtual, inherited]`

Definition at line 138 of file vgfx.cpp.

void vgfx::Primitive::setContainerDictionary	(	const VecString &	path,
		const dictionary_t &	data
	)			`[virtual, inherited]`

Definition at line 153 of file vgfx.cpp.

virtual void vgfx::Primitive::recalcBoundingRect	(	const char *	tag_path,
		Drawer *	drawer,
		const xform_2d_t &	T
	)			`[pure virtual, inherited]`

virtual bool vgfx::Primitive::getBoundingRect ( rect_t & r ) const throw () [pure virtual, inherited]

bool vgfx::Primitive::getPrimitive	(	const char *	tag_path,
		const xform_2d_t &	T,
		visit_result_t &	vr
	)			`[virtual, inherited]`

Definition at line 181 of file vgfx.cpp.

void vgfx::Primitive::draw	(	Drawer *	drawer,
		const rect_t &	r_pix,
		const xform_2d_t &	T
	)			`[pure virtual, inherited]`

draw this primitive and all children, recursively

Definition at line 167 of file vgfx.cpp.

bool vgfx::Primitive::visit	(	const rect_t &	r,
		const xform_2d_t &	T,
		const char *	tag_path,
		callback_t	callback,
		void *	context,
		eHitDetect	hit
	)			`[virtual, inherited]`

Definition at line 200 of file vgfx.cpp.

smart_ptr< Primitive > vgfx::Primitive::create	(	const char *	type,
		const dictionary_t &	data
	)			`[static, inherited]`

Definition at line 244 of file vgfx.cpp.

virtual long vgfx::ObjectMap::size ( void ) const throw () [pure virtual, inherited]

virtual void vgfx::ObjectMap::newObjectID	(	const char *	prefix,
		std::string &	id
	)			`[pure virtual, inherited]`

virtual void vgfx::ObjectMap::addObject ( smart_ptr< Primitive > & primitive ) [pure virtual, inherited]

virtual Primitive* vgfx::ObjectMap::findObject ( const char * ID ) const throw () [pure virtual, inherited]

virtual smart_ptr<Primitive> vgfx::ObjectMap::removeObject ( const char * ID ) [pure virtual, inherited]

smart_ptr< ObjectMap > vgfx::ObjectMap::create ( void ) [static, inherited]

Definition at line 275 of file object_map.cpp.

bool vgfx::processRequest	(	ObjectMap *	map,
		std::istream &	stream,
		bool	single_transaction,
		std::string &	undo_request,
		std::string &	diagnostic
	)

Request that an ObjectMap be updated with the given request.

Returns false on failure.

Parameters:

	map	ObjectMap upon which the request will act.
	stream	Input text stream containing request. See vgfx Request Format.
	single_transaction	If true, the request will be handled as an atomic operation and an undo request will be returned. If false, there is no rollback of partial commits. Use true unless you have good reason otherwise.
	undo_request	On output, this contains a request which will undo the original input request. Handy for undo/redo stacks.
	diagnostic	If the return value is false, this string will contain some details on output which may be helpful in tracking down what failed.

void vgfx::invokeFunction	(	Primitive *	in_function,
		ObjectMap *	map,
		const dictionary_t &	in_params,
		std::ostream &	out
	)

Primitive * vgfx::addFunctionFromPath	(	ObjectMap *	map,
		const char *	path
	)

void vgfx::setScript	(	ObjectMap *	map,
		const char *	parent_id,
		const char *	script_id,
		const objtree::property_set_t &	pset_def,
		std::ostream &	stream,
		std::string &	root
	)

void vgfx::updateScriptParameters	(	ObjectMap *	map,
		const char *	parent_id,
		const objtree::property_set_t &	pset,
		std::ostream &	stream
	)

void vgfx::resizeScript	(	ObjectMap *	map,
		const char *	parent_id,
		float	width,
		float	height,
		std::ostream &	stream
	)

template<class T >

std::string vgfx::getStringValue ( const T & t )

Definition at line 326 of file vgfx.h.

void vgfx::init_point_from_data	(	const dictionary_t &	data,
		init_point_t &
	)

smart_ptr<Primitive> vgfx::create_point ( const init_point_t & )

void vgfx::init_bezier_from_data	(	const dictionary_t &	data,
		init_bezier_t &	init
	)

smart_ptr< Primitive > vgfx::create_bezier ( const init_bezier_t & init )

void vgfx::init_rect_from_data	(	const dictionary_t &	data,
		init_rect_t &	init
	)

smart_ptr< Primitive > vgfx::create_rect ( const init_rect_t & init )

void vgfx::init_line_from_data	(	const dictionary_t &	data,
		init_line_t &	init
	)

smart_ptr< Primitive > vgfx::create_line ( const init_line_t & init )

void vgfx::init_dxdy_from_data	(	const dictionary_t &	data,
		init_dxdy_t &
	)

smart_ptr<Primitive> vgfx::create_dxdy ( const init_dxdy_t & )

void vgfx::init_quad_from_data	(	const dictionary_t &	data,
		init_quad_t &	init
	)

smart_ptr< Primitive > vgfx::create_quad ( const init_quad_t & init )

smart_ptr< Primitive > vgfx::parseGroup	(	std::istream &	stream,
		ObjectMap *	map
	)

smart_ptr< Primitive > vgfx::parseFunction	(	std::istream &	stream,
		ObjectMap *	map
	)

void vgfx::init_text_from_data	(	const dictionary_t &	data,
		init_text_t &	init
	)

smart_ptr< Primitive > vgfx::create_text ( const init_text_t & init )

Variable Documentation

Primitive* vgfx::visit_result_t::p [inherited]

Definition at line 145 of file vgfx.h.

const char* vgfx::visit_result_t::tag_path [inherited]

Definition at line 146 of file vgfx.h.

xform_2d_t vgfx::visit_result_t::T [inherited]

Definition at line 147 of file vgfx.h.

long vgfx::Primitive::m_refcount [private, inherited]

Definition at line 216 of file vgfx.h.

std::string vgfx::Primitive::m_id [private, inherited]

Definition at line 217 of file vgfx.h.

float vgfx::init_point_t::y0 [inherited]

Definition at line 357 of file vgfx.h.

bool vgfx::init_rect_t::fill [inherited]

Definition at line 378 of file vgfx.h.

float vgfx::init_line_t::y0 [inherited]

Definition at line 389 of file vgfx.h.

float vgfx::init_line_t::x1 [inherited]

Definition at line 390 of file vgfx.h.

float vgfx::init_line_t::y1 [inherited]

Definition at line 391 of file vgfx.h.

float vgfx::init_dxdy_t::dy [inherited]

Definition at line 402 of file vgfx.h.

Vector Graphics Engine [Libraries]

Classes

Namespaces

Modules

Typedefs

Enumerations

Functions

Variables

Detailed Description

Typedef Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation

Vector Graphics Engine
[Libraries]