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GocGroup

GocGroup — Group item

Properties

gdouble x Read / Write
gdouble y Read / Write

Types and Values

Object Hierarchy

    GObject
    ╰── GocItem
        ╰── GocGroup

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.

Functions

goc_group_add_child ()

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

Adds item as a new child to parent .

Parameters

parent

GocGroup

 

item

GocItem

 

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,

Parameters

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,

Parameters

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().

Parameters

group

GocGroup

 

cr

cairo_t

 

x

horizontal coordinate

 

y

vertical coordinate

 

goc_group_clear ()

void
goc_group_clear (GocGroup *group);

Destroys all group children.

Parameters

group

GocGroup

 

goc_group_new ()

GocGroup *
goc_group_new (GocGroup *parent);

Creates a new GocGroup as a child of parent .

Parameters

parent

GocGroup

 

Returns

the newly created GocGroup.

[transfer none]


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 .

Parameters

parent

GocGroup

 

item

GocItem

 

goc_group_set_clip_path ()

void
goc_group_set_clip_path (GocGroup *group,
                         GOPath *clip_path,
                         cairo_fill_rule_t clip_rule);

Clips the drawing inside path .

Parameters

group

GocGroup

 

clip_path

GOPath

 

clip_rule

cairo_fill_rule_t

 

Types and Values

GocGroup

typedef struct _GocGroup GocGroup;


struct GocGroupClass

struct GocGroupClass {
	GocItemClass base;
};

Members

GocItemClass base;

base class.

 

Property Details

The “x” property

  “x”                        gdouble

The group horizontal offset.

Flags: Read / Write

Default value: 0


The “y” property

  “y”                        gdouble

The group vertical offset.

Flags: Read / Write

Default value: 0

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