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GocGroup

GocGroup — Group item

Synopsis

                    GocGroup;
                    GocGroupClass;
GocGroup *          goc_group_new                       (GocGroup *parent);
void                goc_group_add_child                 (GocGroup *parent,
                                                         GocItem *item);
void                goc_group_remove_child              (GocGroup *parent,
                                                         GocItem *item);
void                goc_group_clear                     (GocGroup *group);
void                goc_group_adjust_bounds             (GocGroup const *group,
                                                         double *x0,
                                                         double *y0,
                                                         double *x1,
                                                         double *y1);
void                goc_group_adjust_coords             (GocGroup const *group,
                                                         double *x,
                                                         double *y);
void                goc_group_cairo_transform           (GocGroup const *group,
                                                         cairo_t *cr,
                                                         double x,
                                                         double y);

Object Hierarchy

  GObject
   +----GocItem
         +----GocGroup

Properties

  "x"                        gdouble               : Read / Write
  "y"                        gdouble               : Read / Write

Description

A GocGroup is a GocItem which just contains other items.

The contents of the canvas are stored as a tree where GocGroup items are branches and other items are leafs.

Details

GocGroup

typedef struct _GocGroup GocGroup;


GocGroupClass

typedef struct {
	GocItemClass base;
} GocGroupClass;


goc_group_new ()

GocGroup *          goc_group_new                       (GocGroup *parent);

Creates a new GocGroup as a child of parent.

parent :

GocGroup

Returns :

the newly created GocGroup.

goc_group_add_child ()

void                goc_group_add_child                 (GocGroup *parent,
                                                         GocItem *item);

Adds item as a new child to parent.

parent :

GocGroup

item :

GocItem

goc_group_remove_child ()

void                goc_group_remove_child              (GocGroup *parent,
                                                         GocItem *item);

Removes item from parent. This function will fail if item is not a child of parent.

parent :

GocGroup

item :

GocItem

goc_group_clear ()

void                goc_group_clear                     (GocGroup *group);

Destroys all group children.

group :

GocGroup

goc_group_adjust_bounds ()

void                goc_group_adjust_bounds             (GocGroup const *group,
                                                         double *x0,
                                                         double *y0,
                                                         double *x1,
                                                         double *y1);

Adds group horizontal offset to x0 and x1, and vertical offset to y0 and y1. This function is called recursively so that when returning x0, y0, x1, and y1 are absolute coordinates in canvas space,

group :

GocGroup

x0 :

first horizontal coordinate

y0 :

first vertical coordinate

x1 :

last horizontal coordinate

y1 :

last vertical coordinate

goc_group_adjust_coords ()

void                goc_group_adjust_coords             (GocGroup const *group,
                                                         double *x,
                                                         double *y);

Adds group horizontal offset to x0, and vertical offset to y0. This function is called recursively so that when returning x0 and y0 are absolute coordinates in canvas space,

group :

GocGroup

x :

horizontal coordinate

y :

vertical coordinate

goc_group_cairo_transform ()

void                goc_group_cairo_transform           (GocGroup const *group,
                                                         cairo_t *cr,
                                                         double x,
                                                         double y);

Translates cr current context so that operations start at (x,y), which are group relative coordinates, and is scaled according to the containing GocCanvas current scale (see goc_canvas_get_pixels_per_unit()). The translation takes all group ancestors into account.

This function does not call cairo_save().

group :

GocGroup

cr :

cairo_t

x :

horizontal coordinate

y :

vertical coordinate

Property Details

The "x" property

  "x"                        gdouble               : Read / Write

The group horizontal offset.

Default value: 0


The "y" property

  "y"                        gdouble               : Read / Write

The group vertical offset.

Default value: 0

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