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