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GooCanvas Reference Manual | |
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#include <goocanvas.h>
GooCanvasPolyline;
GooCanvasItem* goo_canvas_polyline_new (GooCanvasItem *parent,
gboolean close_path,
gint num_points,
...);
GooCanvasItem* goo_canvas_polyline_new_line (GooCanvasItem *parent,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2,
const gchar *first_property,
...);
"arrow-length" gdouble : Read / Write "arrow-tip-length" gdouble : Read / Write "arrow-width" gdouble : Read / Write "close-path" gboolean : Read / Write "end-arrow" gboolean : Read / Write "points" GooCanvasPoints : Read / Write "start-arrow" gboolean : Read / Write
GooCanvasPolyline represents a polyline item, which is a series of one or more lines, with optional arrows at either end.
It is a subclass of GooCanvasItemSimple and so inherits all of the style properties such as "stroke-color", "fill-color" and "line-width".
It also implements the GooCanvasItem interface, so you can use the
GooCanvasItem functions such as goo_canvas_item_raise() and
goo_canvas_item_rotate().
To create a GooCanvasPolyline use goo_canvas_polyline_new().
To get or set the properties of an existing GooCanvasPolyline, use
g_object_get() and g_object_set().
To respond to events such as mouse clicks on the polyline you must connect
to the signal handlers of the corresponding GooCanvasPolylineView objects.
(See goo_canvas_view_get_item_view() and GooCanvasView::item-view-created.)
typedef struct _GooCanvasPolyline GooCanvasPolyline;
The GooCanvasPolyline struct contains private data only.
GooCanvasItem* goo_canvas_polyline_new (GooCanvasItem *parent, gboolean close_path, gint num_points, ...);
Creates a new polyline item.
parent : |
the parent item, or NULL. If a parent is specified, it will assume
ownership of the item, and the item will automatically be freed when it is
removed from the parent. Otherwise call g_object_unref() to free it.
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close_path : |
if the last point should be connected to the first. |
num_points : |
the number of points in the polyline. |
... : |
the pairs of coordinates for each point in the line, followed by
optional pairs of property names and values, and a terminating NULL.
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| Returns : | a new polyline item. |
Here's an example showing how to create a filled triangle with vertices at (100,100), (300,100), and (200,300).
GooCanvasItem *polyline = goo_canvas_polyline_new (mygroup, TRUE, 3,
100.0, 100.0,
300.0, 100.0,
200.0, 300.0,
"stroke-color", "red",
"line-width", 5.0,
"fill-color", "blue",
NULL);
GooCanvasItem* goo_canvas_polyline_new_line (GooCanvasItem *parent, gdouble x1, gdouble y1, gdouble x2, gdouble y2, const gchar *first_property, ...);
Creates a new polyline item with a single line.
parent : |
the parent item, or NULL.
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x1 : |
the x coordinate of the start of the line. |
y1 : |
the y coordinate of the start of the line. |
x2 : |
the x coordinate of the end of the line. |
y2 : |
the y coordinate of the end of the line. |
first_property : |
the name of the first property to set, or NULL.
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... : |
the remaining property names and values to set, terminated with a
NULL.
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| Returns : | a new polyline item. |
Here's an example showing how to create a line from (100,100) to (300,300).
GooCanvasItem *polyline = goo_canvas_polyline_new_line (mygroup,
100.0, 100.0,
300.0, 300.0,
"stroke-color", "red",
"line-width", 5.0,
NULL);
arrow-length" property"arrow-length" gdouble : Read / Write
The length of the arrows, as a multiple of the line width.
Allowed values: >= 0
Default value: 5
arrow-tip-length" property"arrow-tip-length" gdouble : Read / Write
The length of the arrow tip, as a multiple of the line width.
Allowed values: >= 0
Default value: 4
arrow-width" property"arrow-width" gdouble : Read / Write
The width of the arrows, as a multiple of the line width.
Allowed values: >= 0
Default value: 4
close-path" property"close-path" gboolean : Read / Write
If the last point should be connected to the first.
Default value: FALSE
end-arrow" property"end-arrow" gboolean : Read / Write
If an arrow should be displayed at the end of the polyline.
Default value: FALSE