ExamplePresentation Class Reference

#include <examplepresentation.hh>

Inheritance diagram for ExamplePresentation:

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Public Member Functions
	ExamplePresentation ()
	~ExamplePresentation () override
	ExamplePresentation (const ExamplePresentation &)=delete
	ExamplePresentation (ExamplePresentation &&)=delete
ExamplePresentation	operator= (const ExamplePresentation &)=delete
ExamplePresentation	operator= (ExamplePresentation &&)=delete
Scroom::Utils::Rectangle< double >	getRect () override
void	open (ViewInterface::WeakPtr viewInterface) override
void	redraw (ViewInterface::Ptr const &vi, cairo_t *cr, Scroom::Utils::Rectangle< double > presentationArea, int zoom) override
void	close (ViewInterface::WeakPtr vi) override
bool	getProperty (const std::string &name, std::string &value) override
bool	isPropertyDefined (const std::string &name) override
std::string	getTitle () override
Public Member Functions inherited from PresentationInterface
virtual Scroom::Utils::Point< double >	getAspectRatio () const
Public Member Functions inherited from Scroom::Utils::Observable< T >
	Observable ()
	~Observable () override
	Observable (const Observable &)=delete
	Observable (Observable &&)=delete
Observable	operator= (const Observable &)=delete
Observable	operator= (Observable &&)=delete
Scroom::Bookkeeping::Token	registerStrongObserver (Observer const &observer)
Scroom::Bookkeeping::Token	registerObserver (ObserverWeak const &observer)

Private Member Functions
void	fillPattern ()

Private Attributes
cairo_pattern_t *	pattern {nullptr}

Additional Inherited Members
Public Types inherited from PresentationInterface
using	Ptr = boost::shared_ptr< PresentationInterface >
using	WeakPtr = boost::weak_ptr< PresentationInterface >
Public Types inherited from Viewable
using	Ptr = boost::shared_ptr< Viewable >
using	WeakPtr = boost::weak_ptr< Viewable >
Public Types inherited from Scroom::Utils::Observable< T >
using	Observer = boost::shared_ptr< T >
using	Ptr = boost::shared_ptr< Observable< T > >
Protected Member Functions inherited from Scroom::Utils::Observable< T >
std::list< Observer >	getObservers ()
virtual void	observerAdded (Observer const &observer, Scroom::Bookkeeping::Token const &token)

Constructor & Destructor Documentation

ExamplePresentation() [1/3]

ExamplePresentation::ExamplePresentation

(

)

{ fillPattern(); }

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~ExamplePresentation()

ExamplePresentation::~ExamplePresentation ( )

override

{ cairo_pattern_destroy(pattern); }

ExamplePresentation() [2/3]

ExamplePresentation::ExamplePresentation ( const ExamplePresentation &  )

delete

ExamplePresentation() [3/3]

ExamplePresentation::ExamplePresentation ( ExamplePresentation &&  )

delete

Member Function Documentation

close()

void ExamplePresentation::close ( ViewInterface::WeakPtr  vi )

overridevirtual

Gets called just before the View is destroyed

Precondition

Should be called from within a Gdk critical section (i.e. between gdk_threads_enter() and gdk_threads_leave() calls)

Implements Viewable.

{ UNUSED(vi); }

fillPattern()

void ExamplePresentation::fillPattern ( )

private

{
  cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_A1, 1010, 1010);
  cairo_t*         cr      = cairo_create(surface);
 
  const int xorig = 505;
  const int yorig = 505;
 
  for(int i = -500; i <= 500; i += 50)
  {
    cairo_move_to(cr, xorig - 500, yorig + i);
    cairo_line_to(cr, xorig + 500, yorig + i);
    cairo_move_to(cr, xorig + i, yorig - 500);
    cairo_line_to(cr, xorig + i, yorig + 500);
  }
  cairo_move_to(cr, xorig - 500, yorig - 500);
  cairo_line_to(cr, xorig + 500, yorig + 500);
  cairo_move_to(cr, xorig - 500, yorig + 500);
  cairo_line_to(cr, xorig + 500, yorig - 500);
 
  cairo_stroke(cr);
 
  pattern = cairo_pattern_create_for_surface(cairo_get_target(cr));
 
  cairo_destroy(cr);
  cairo_surface_destroy(surface);
}

Referenced by ExamplePresentation().

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getProperty()

bool ExamplePresentation::getProperty ( const std::string &  name, std::string &  value  )

overridevirtual

Return the value of the requested property

Parameters

[in]	name	The name of the requested property
[out]	value	The value of the requested property

Return values

true	if the property existed
false	if the property didn't exist

Implements PresentationInterface.

{
  UNUSED(name);
  UNUSED(value);
 
  return false;
}

getRect()

Scroom::Utils::Rectangle< double > ExamplePresentation::getRect ( )

overridevirtual

Return the dimensions of your presentation

Implements PresentationInterface.

{ return {-500, -500, 1000, 1000}; }

Referenced by redraw().

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getTitle()

std::string ExamplePresentation::getTitle ( )

overridevirtual

Return the title of the presentation

Implements PresentationInterface.

{ return ""; }

isPropertyDefined()

bool ExamplePresentation::isPropertyDefined ( const std::string &  name )

overridevirtual

Return true if the named property exists

Implements PresentationInterface.

{
  UNUSED(name);
 
  return false;
}

open()

void ExamplePresentation::open ( ViewInterface::WeakPtr  vi )

overridevirtual

Gets called just after the View is created

Precondition

Should be called from within a Gdk critical section (i.e. between gdk_threads_enter() and gdk_threads_leave() calls)

Implements Viewable.

{ UNUSED(viewInterface); }

operator=() [1/2]

ExamplePresentation ExamplePresentation::operator= ( const ExamplePresentation &  )

delete

operator=() [2/2]

ExamplePresentation ExamplePresentation::operator= ( ExamplePresentation &&  )

delete

redraw()

void ExamplePresentation::redraw ( ViewInterface::Ptr const &  vi, cairo_t *  cr, Scroom::Utils::Rectangle< double >  presentationArea, int  zoom  )

overridevirtual

Draw the requested ara at the requested zoom level

Parameters

vi	The ViewInterface on whose behalf the request is made
cr	The context to draw the area on
presentationArea	the area that is to be drawn. The given x and y coordinates should map on 0,0 of the given context cr.
zoom	The requested zoom level. One pixel of your presentation should have size 2**zoom when drawn. zoom may be negative.

Implements PresentationInterface.

{
  cairo_rectangle_int_t const presentationArea = pa.toGdkRectangle();
  UNUSED(vi);
  const double pp    = pixelSizeFromZoom(zoom);
  const double scale = pow(2, -zoom);
 
  Scroom::Utils::Rectangle<double> const actualPresentationArea = getRect();
  drawOutOfBoundsWithBackground(cr, pa, actualPresentationArea, pp);
 
  const int xorig = static_cast<int>(-presentationArea.x * pp);
  const int yorig = static_cast<int>(-presentationArea.y * pp);
 
  cairo_matrix_t m;
  cairo_matrix_init_translate(&m, 505, 505);
  cairo_matrix_scale(&m, scale, scale);
  cairo_matrix_translate(&m, -xorig, -yorig);
  cairo_pattern_set_matrix(pattern, &m);
  cairo_mask(cr, pattern);
 
  // cairo_set_source_surface(cr, surface, xorig-505, yorig-505);
  // cairo_paint(cr);
}

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Member Data Documentation

pattern

cairo_pattern_t* ExamplePresentation::pattern {nullptr}

private

Referenced by fillPattern(), redraw(), and ~ExamplePresentation().

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

• plugins/example/examplepresentation.hh
• plugins/example/examplepresentation.cc