ChamplainBoundingBox

ChamplainBoundingBox — A basic struct to describe a bounding box

Synopsis

struct              ChamplainBoundingBox;
ChamplainBoundingBox * champlain_bounding_box_new       (void);
ChamplainBoundingBox * champlain_bounding_box_copy      (const ChamplainBoundingBox *bbox);
void                champlain_bounding_box_free         (ChamplainBoundingBox *bbox);
void                champlain_bounding_box_get_center   (ChamplainBoundingBox *bbox,
                                                         gdouble *latitude,
                                                         gdouble *longitude);
void                champlain_bounding_box_compose      (ChamplainBoundingBox *bbox,
                                                         ChamplainBoundingBox *other);
void                champlain_bounding_box_extend       (ChamplainBoundingBox *bbox,
                                                         gdouble latitude,
                                                         gdouble longitude);
gboolean            champlain_bounding_box_is_valid     (ChamplainBoundingBox *bbox);

Object Hierarchy

  GBoxed
   +----ChamplainBoundingBox

Description

A basic struct to describe a bounding box.

Details

struct ChamplainBoundingBox

struct ChamplainBoundingBox {
  gdouble left;
  gdouble top;
  gdouble right;
  gdouble bottom;
};

Defines the area of a ChamplainMapDataSource that contains data.

gdouble left;

 left coordinate

gdouble top;

 top coordinate

gdouble right;

 right coordinate

gdouble bottom;

 bottom coordinate

Since 0.6

champlain_bounding_box_new ()

ChamplainBoundingBox * champlain_bounding_box_new       (void);

Creates a newly allocated ChamplainBoundingBox to be freed with champlain_bounding_box_free().

Returns :

 a ChamplainBoundingBox

Since 0.6

champlain_bounding_box_copy ()

ChamplainBoundingBox * champlain_bounding_box_copy      (const ChamplainBoundingBox *bbox);

Makes a copy of the bounding box structure. The result must be freed using champlain_bounding_box_free().

bbox :

 a ChamplainBoundingBox

Returns :

 an allocated copy of bbox.

Since 0.6

champlain_bounding_box_free ()

void                champlain_bounding_box_free         (ChamplainBoundingBox *bbox);

Frees a bounding box structure created with champlain_bounding_box_new() or champlain_bounding_box_copy().

bbox :

 a ChamplainBoundingBox

Since 0.6

champlain_bounding_box_get_center ()

void                champlain_bounding_box_get_center   (ChamplainBoundingBox *bbox,
                                                         gdouble *latitude,
                                                         gdouble *longitude);

Sets the latitude and longitude of the box to lat and lon.

bbox :

 a ChamplainBoundingBox

latitude :

 the latitude of the box center. [out]

longitude :

 the longitude of the box center. [out]

Since 0.6

champlain_bounding_box_compose ()

void                champlain_bounding_box_compose      (ChamplainBoundingBox *bbox,
                                                         ChamplainBoundingBox *other);

Sets bbox equal to the bounding box containing both bbox and other.

bbox :

 a ChamplainBoundingBox

other :

 a ChamplainBoundingBox

Since 0.10

champlain_bounding_box_extend ()

void                champlain_bounding_box_extend       (ChamplainBoundingBox *bbox,
                                                         gdouble latitude,
                                                         gdouble longitude);

Extend the bounding box so it contains a point with latitude and longitude. Do nothing if the point is already inside the bounding box.

bbox :

 a ChamplainBoundingBox

latitude :

 latitude

longitude :

 longitude

Since 0.10

champlain_bounding_box_is_valid ()

gboolean            champlain_bounding_box_is_valid     (ChamplainBoundingBox *bbox);

Checks whether bbox represents a valid bounding box on the map.

bbox :

 a ChamplainBoundingBox

Returns :

 TRUE when the bounding box is valid, FALSE otherwise.

Since 0.10

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