Paul Davis
6a5d805b38
Remove Canvas::Layout, use Canvas::Container for the same purpose, move child-rendering into Item::render_children() so that it could theoretically be used by any derived type.
94 lines
2.3 KiB
C++
94 lines
2.3 KiB
C++
/*
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Copyright (C) 2011 Paul Davis
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Author: Carl Hetherington <cth@carlh.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file canvas/arrow.h
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* @brief Declaration of the Arrow canvas object.
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*/
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#ifndef __CANVAS_ARROW_H__
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#define __CANVAS_ARROW_H__
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#include "canvas/visibility.h"
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#include "canvas/container.h"
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namespace ArdourCanvas {
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class Canvas;
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class Line;
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class Polygon;
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/** A composite item which draws a line with arrow heads
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* at either or both ends.
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*
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* The arrow heads are identified by the indices 0 and 1;
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* head 0 is at the (x0, y0) end of the line, and head 1
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* at the (x1, y1) end.
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*
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* @todo Draws vertical lines only; could be generalised
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* to draw lines at any angle.
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*/
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class LIBCANVAS_API Arrow : public Container
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{
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public:
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Arrow (Canvas*);
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Arrow (Item*);
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void set_show_head (int, bool);
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void set_head_outward (int, bool);
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void set_head_height (int, Distance);
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void set_head_width (int, Distance);
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void set_outline_width (Distance);
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void set_color (Color);
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Coord x () const;
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Coord y1 () const;
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void set_x (Coord);
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void set_y0 (Coord);
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void set_y1 (Coord);
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bool covers (Duple const &) const;
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private:
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void setup_polygon (int);
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void setup ();
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/** Representation of a single arrow head */
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struct Head {
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Polygon* polygon; ///< the polygon which represents its shape
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bool outward; ///< true if this head points out from the line
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Distance height; ///< the height of the head
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Distance width; ///< the maximum width of the head
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};
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/** our arrow heads; _heads[0] is at the (x0, y0) end of the line,
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* and _heads[1] at the (x1, y1) end.
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*/
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Head _heads[2];
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/** our line */
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Line* _line;
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};
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}
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#endif
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