CGAL 6.2 - CGAL Ipelets

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CGAL::Ipelet_base< Kernel, nbf > Class Template Referenceabstract
Reference Manual

`#include <CGAL/CGAL_Ipelet_base.h>`

## Definition

template<typename Kernel, typename int nbf>
class CGAL::Ipelet_base< Kernel, nbf >

`Ipelet_base` is an abstract base class for defining an ipelet.

The only function that needs to be defined in a derived class is `protected_run(int i)` that contains the code of an ipelet. Note that the name of the function suggests that the ipelet may throw exceptions that will be caught by a function of the class `Ipelet_base` avoiding Ipe to crash.

Template Parameters

  Kernel | determines the kernel that will be used in the ipelet. This parameter must be set according to the algorithm to be used. The integer `nbf` indicates the number of functions defined by the ipelet.

Examples
  CGAL_ipelets/simple_triangulation.cpp.

## Types
The set of `read objects` is defined as the set of objects of type `Ipelet_base::Point_2`, `Ipelet_base::Segment_2`, `Ipelet_base::Polygon_2`, `Ipelet_base::Circular_arc_2` or `Ipelet_base::Circle_2`. The set of `drawable objects` is defined as the super set of the set of `read objects` also including objects of type `Ipelet_base::Line_2`, `Ipelet_base::Ray_2`, `Ipelet_base::Triangle_2` and `Ipelet_base::Iso_rectangle_2`.
typedef Kernel | Kernel
| The kernel used to define internal types.
typedef Kernel::FT | FT
| The number type of the coordinates.
typedef Kernel::Point_2 | Point_2
| The point type.
typedef Kernel::Circle_2 | Circle_2
| The circle type.
typedef CGAL::tuple< Circle_2, Point_2, Point_2, CGAL::Sign > | Circular_arc_2
| The circular arc type.
typedef CGAL::Weighted_point< Point, FT > | Weighted_point_2
| The weighted point type.
typedef Kernel::Segment_2 | Segment_2
| The segment type.
typedef Kernel::Line_2 | Line_2
| The line type.
typedef Kernel::Ray_2 | Ray_2
| The ray type.
typedef Kernel::Triangle_2 | Triangle_2
| The triangle type.
typedef CGAL::Polygon_2< Kernel > | Polygon_2
| The polygon type.
typedef Kernel::Iso_rectangle_2 | Iso_rectangle_2
| A type to represent bounding boxes.
template<class OutputIterator >
| Point_grabber
| Class type providing operators to extract points from segments and polygons.
template<class OutputIterator >
| Segment_grabber
| Class type providing operators to extract segments from polygons.

## Creation
| CGAL_ipelet (const std::string fct_names[], const std::string help_msg[], const std::string name)
| initializes an ipelet.

## Access Functions
IpePage * | get_ipe_page ()
| This is an advanced function.
IpeletHelper * | get_ipelet_helper ()
| This is an advanced function.

## Operations
void | show_help (bool one_per_func=true)
| Prints in Ipe a pop-up help message constructed from the string array of the constructor.
void | print_error_message (std::string msg)
| Prints the string `msg` as a message in Ipe.
void | protected_run (int i)=0
| function called when the user selects the CGAL ipelet.
template<class V , class O >
Iso_rectangle_2 | read_active_objects (Dispatch_or_drop_output_iterator< V, O > out, bool deselect_all=true, bool delete_selected_objects=false)
| This function assigns to output iterator `out` all handled objects selected in Ipe.
template<class OutputIterator >
boost::function_output_iterator< Point_grabber< OutputIterator > > | point_grabber (OutputIterator it)
| returns an output iterator which wraps `it`.
template<class OutputIterator >
boost::function_output_iterator< Segment_grabber< OutputIterator > > | segment_grabber (OutputIterator it)
| returns an output iterator which wraps `it`.
template<class T >
void | draw_in_ipe (const T &object, bool deselect=false)
| This function draws in the page of Ipe a given object.
template<class T >
void | draw_in_ipe (const T &object, const Iso_rectangle_2 &bbox, bool deselect=false)
| Same as above, except that objects are clipped to `bbox` before been drawn.
template<class Iterator >
void | draw_in_ipe (Iterator begin, Iterator end, bool makegrp=true, bool deselectall=false)
| This function draws in the page of Ipe a set of objects given by an iterator range.
template<class Iterator >
void | draw_in_ipe (Iterator begin, Iterator end, const Iso_rectangle_2 &bbox, bool makegrp=true, bool deselectall=false)
| Same as above, except that objects are clipped to `bbox` before been drawn.
template<class iterator >
void | draw_polyline_in_ipe (iterator first, iterator last, bool setclose=false, bool deselect=false)
| This function draws in the page of Ipe a polyline defined by an iterator range of points.
template<class Triangulation >
void | draw_dual_in_ipe (Triangulation T, const Iso_rectangle_2 &bbox, bool makegrp=true, bool deselect=false)
| This function draws in the page of Ipe the dual of a 2D CGAL triangulation.
template<class Triangulation >
void | draw_skeleton_in_ipe (Triangulation T, const Iso_rectangle_2 &bbox, bool makegrp=true, bool deselect=false)
| This function draws in the page of Ipe the Voronoi segment skeleton from a triangulation of segments.
template<class T >
std::pair< int, T > | request_value_from_user (std::string msg)
| This function induces the creation of a dialog box requesting a value from the user.

## Member Typedef Documentation

## ◆ Circular_arc_2

template<typename Kernel , typename int nbf>

typedef CGAL::tuple<Circle_2,Point_2,Point_2,CGAL::Sign> CGAL::Ipelet_base< Kernel, nbf >::Circular_arc_2

The circular arc type.

The `CGAL::Sign`, equals either to `CGAL::COUNTERCLOCKWISE` or `CGAL::CLOCKWISE`, indicates if the arc is the set of points on the circle from the first point to the second point turning clockwise or counterclockwise.

## Member Function Documentation

## ◆ CGAL_ipelet()

template<typename Kernel , typename int nbf>

CGAL::Ipelet_base< Kernel, nbf >::CGAL_ipelet | ( | const std::string | fct_names[],
|  | const std::string | help_msg[],
|  | const std::string | name
| ) |  |

initializes an ipelet.

The string `name` is the name given to the ipelet in the Ipe menu. The string array `fct_names` contains the names of these functions as they will appear in the sub-menu of the ipelet. The string array `help_msg` of size one or `nbf-1` contains a help message for each function of the ipelet. These help messages can be printed using the member function `show_help()`. This function expects that the last function defined in the ipelet is dedicated to print the help message. It is advised that the last function defined is dedicated to show a help message.

## ◆ draw_dual_in_ipe()

template<typename Kernel , typename int nbf>
template<class Triangulation >

void CGAL::Ipelet_base< Kernel, nbf >::draw_dual_in_ipe | ( | Triangulation | T,
|  | const Iso_rectangle_2 & | bbox,
|  | bool | makegrp = `true`,
|  | bool | deselect = `false`
| ) |  |

This function draws in the page of Ipe the dual of a 2D CGAL triangulation.

The edges of the dual are restricted to the interior of `bbox`. If the boolean `makegrp` is set to `true`, segments drawn define a group in Ipe. If the boolean `deselect` is set to `true`, segments drawn are deselected.

## ◆ draw_in_ipe() [1/2]

template<typename Kernel , typename int nbf>
template<class T >

void CGAL::Ipelet_base< Kernel, nbf >::draw_in_ipe | ( | const T & | object,
|  | bool | deselect = `false`
| ) |  |

This function draws in the page of Ipe a given object.

`T` must be a type inside the set of `drawable objects`. When `object` is of type `Line_2` or `Ray_2`, only the part of the object that is inside the page of Ipe (if not empty) is drawn. This function is also able to draw a 2D CGAL triangulation as a group of segments. If the boolean `deselect` is set to `true`, object drawn is deselected.

## ◆ draw_in_ipe() [2/2]

template<typename Kernel , typename int nbf>
template<class Iterator >

void CGAL::Ipelet_base< Kernel, nbf >::draw_in_ipe | ( | Iterator | begin,
|  | Iterator | end,
|  | bool | makegrp = `true`,
|  | bool | deselectall = `false`
| ) |  |

This function draws in the page of Ipe a set of objects given by an iterator range.

These objects must be of a type inside the set of `drawable objects`. If the boolean `makegrp` is set to `true`, objects drawn define a group in Ipe. If the boolean `deselectall` is set to `true`, objects drawn are deselected.

## ◆ draw_polyline_in_ipe()

template<typename Kernel , typename int nbf>
template<class iterator >

void CGAL::Ipelet_base< Kernel, nbf >::draw_polyline_in_ipe | ( | iterator | first,
|  | iterator | last,
|  | bool | setclose = `false`,
|  | bool | deselect = `false`
| ) |  |

This function draws in the page of Ipe a polyline defined by an iterator range of points.

If the boolean `setclose` is `true`, the polyline drawn is closed. If the boolean `deselect` is set to `true`, polyline drawn is deselected.

## ◆ draw_skeleton_in_ipe()

template<typename Kernel , typename int nbf>
template<class Triangulation >

void CGAL::Ipelet_base< Kernel, nbf >::draw_skeleton_in_ipe | ( | Triangulation | T,
|  | const Iso_rectangle_2 & | bbox,
|  | bool | makegrp = `true`,
|  | bool | deselect = `false`
| ) |  |

This function draws in the page of Ipe the Voronoi segment skeleton from a triangulation of segments.

The edges are restricted to the interior of `bbox`. If the boolean `makegrp` is set to `true`, segments drawn define a group in Ipe. If the boolean `deselect` is set to `true`, segments drawn are deselected.

## ◆ get_ipe_page()

template<typename Kernel , typename int nbf>

IpePage * CGAL::Ipelet_base< Kernel, nbf >::get_ipe_page | ( |  | ) |

This is an advanced function.

Advanced

returns a pointer to an Ipe object representing the drawing page. Refer to the Ipe library documentation for more details.

## ◆ get_ipelet_helper()

template<typename Kernel , typename int nbf>

IpeletHelper * CGAL::Ipelet_base< Kernel, nbf >::get_ipelet_helper | ( |  | ) |

This is an advanced function.

Advanced

returns a pointer to an Ipe object providing services to Ipelets. Refer to the Ipe library documentation for more details.

## ◆ point_grabber()

template<typename Kernel , typename int nbf>
template<class OutputIterator >

boost::function_output_iterator< Point_grabber< OutputIterator > > CGAL::Ipelet_base< Kernel, nbf >::point_grabber | ( | OutputIterator | it | ) |

returns an output iterator which wraps `it`.

`OutputIterator` must be a model of the output iterator concept accepting assignments from `Point_2`. The returned output iterator will accept assignments from objects of types `Polygon_2` or `Segment_2` or `Point_2`, it decomposes them in objects of type `Point_2` and assigns them to `it`. For more details on the returned output iterator refer to the Boost library documentation.

## ◆ read_active_objects()

template<typename Kernel , typename int nbf>
template<class V , class O >

Iso_rectangle_2 CGAL::Ipelet_base< Kernel, nbf >::read_active_objects | ( | Dispatch_or_drop_output_iterator< V, O > | out,
|  | bool | deselect_all = `true`,
|  | bool | delete_selected_objects = `false`
| ) |  |

This function assigns to output iterator `out` all handled objects selected in Ipe.

Objects read belong to the set of `read objects` (even within groups). The output iterator `out` must be able to handle all `read objects` (see `CGAL::Dispatch_or_drop_output_iterator<V,O>`). In addition, a bounding box (`Iso_rectangle_2`) of the active objects selected is returned. The two Boolean arguments indicate whether the retrieved objects must be deselected and/or removed. Note that non-retrieved objects (primitives of Ipe not handled or objects dropped by `out`) are automatically deselected, and not deleted. If a non-retrieved object is a sub-path or is inside a group, the whole path or group will not be deleted.

## ◆ request_value_from_user()

template<typename Kernel , typename int nbf>
template<class T >

std::pair< int, T > CGAL::Ipelet_base< Kernel, nbf >::request_value_from_user | ( | std::string | msg | ) |

This function induces the creation of a dialog box requesting a value from the user.

The string `msg` is printed in this dialog box. Ipe lexer tries to convert the user input into an object of type `T` (a simple type such as `int`, `float`, etc). If the conversion is possible, the value is returned within a `std::pair`. The integer of the pair returned is -1 if the user input is not correct, 0 if user input is empty and 1, otherwise. otherwise.

## ◆ segment_grabber()

template<typename Kernel , typename int nbf>
template<class OutputIterator >

boost::function_output_iterator< Segment_grabber< OutputIterator > > CGAL::Ipelet_base< Kernel, nbf >::segment_grabber | ( | OutputIterator | it | ) |

returns an output iterator which wraps `it`.

`OutputIterator` must be a model of the output iterator concept accepting assignments from `Segment_2`. The returned output iterator will accept assignments from objects of types `Polygon_2` or `Segment_2`, it decomposes them in objects of type `Segment_2` and assigns them to `it`. For more details on the returned output iterator refer to the Boost library documentation.

## ◆ show_help()

template<typename Kernel , typename int nbf>

void CGAL::Ipelet_base< Kernel, nbf >::show_help | ( | bool | one_per_func = `true` | ) |

Prints in Ipe a pop-up help message constructed from the string array of the constructor.

This function expects that the last function defined in the ipelet is dedicated to print the help message. When the boolean `one_per_func` is `true`, one help message per function is printed (except for the help function itself) using the `nbf-1` strings in the array given to the constructor. Otherwise, only one help message is printed using the first string in the array given to the constructor.