/** Construct an Arrow.
* @param parent Parent canvas group.
*/
-Arrow::Arrow (Group* parent)
- : Group (parent)
+Arrow::Arrow (Canvas* c)
+ : Container (c)
{
- assert (parent);
+ setup ();
+}
+Arrow::Arrow (Item* parent)
+ : Container (parent)
+{
+ setup ();
+}
+
+void
+Arrow::setup ()
+{
/* set up default arrow heads at each end */
for (int i = 0; i < 2; ++i) {
_heads[i].polygon = new Polygon (this);
CANVAS_DEBUG_NAME (_line, "arrow line");
}
+void
+Arrow::compute_bounding_box () const
+{
+ /* Compute our bounding box manually rather than using the default
+ container algorithm, since having the bounding box with origin other
+ than zero causes strange problems for mysterious reasons. */
+
+ const double outline_pad = 0.5 + (_line->outline_width() / 2.0);
+ const double head_width = std::max(_heads[0].width, _heads[1].width);
+
+ _bounding_box = Rect(0,
+ 0,
+ _line->x1() + (head_width / 2.0) + outline_pad,
+ _line->y1());
+
+ _bounding_box_dirty = false;
+}
+
/** Set whether to show an arrow head at one end or other
* of the line.
* @param which 0 or 1 to specify the arrow head to set up.
if (_heads[1].polygon) {
_heads[1].polygon->set_outline_width (width);
}
+ _bounding_box_dirty = true;
}
/** Set the x position of our line.
_heads[i].polygon->set_x_position (x - _heads[i].width / 2);
}
}
-
+ _bounding_box_dirty = true;
}
/** Set the y position of end 0 of our line.
if (_heads[0].polygon) {
_heads[0].polygon->set_y_position (y0);
}
+ _bounding_box_dirty = true;
}
/** Set the y position of end 1 of our line.
if (_heads[1].polygon) {
_heads[1].polygon->set_y_position (y1 - _heads[1].height);
}
+ _bounding_box_dirty = true;
}
/** @return x position of our line in pixels (in our coordinate system) */