Paul Davis
590882f3c8
Items no longer need a parent group (they require a Canvas pointer instead), so all constructors have been rationalized and have two variants, one with a parent and one with a canvas. All Items now inherit from Fill and Outline, to banish diagonal inheritance and virtual base classes and all that. There were zero changes to the Ardour GUI arising from these changes.
272 lines
6.0 KiB
C++
272 lines
6.0 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.cc
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* @brief Implementation of the Arrow canvas object.
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*/
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#include "pbd/compose.h"
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#include "canvas/arrow.h"
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#include "canvas/debug.h"
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#include "canvas/polygon.h"
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#include "canvas/line.h"
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using namespace ArdourCanvas;
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/** Construct an Arrow.
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* @param parent Parent canvas group.
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*/
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Arrow::Arrow (Canvas* c)
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: Group (c)
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{
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setup ();
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}
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Arrow::Arrow (Group* g)
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: Group (g)
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{
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setup ();
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}
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void
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Arrow::setup ()
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{
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/* set up default arrow heads at each end */
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for (int i = 0; i < 2; ++i) {
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_heads[i].polygon = new Polygon (this);
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_heads[i].outward = true;
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_heads[i].width = 4;
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_heads[i].height = 4;
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setup_polygon (i);
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CANVAS_DEBUG_NAME (_heads[i].polygon, string_compose ("arrow head %1", i));
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}
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_line = new Line (this);
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CANVAS_DEBUG_NAME (_line, "arrow line");
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}
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/** Set whether to show an arrow head at one end or other
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* of the line.
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* @param which 0 or 1 to specify the arrow head to set up.
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* @param true if this arrow head should be shown.
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*/
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void
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Arrow::set_show_head (int which, bool show)
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{
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assert (which == 0 || which == 1);
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begin_change ();
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if (!show) {
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delete _heads[which].polygon;
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_heads[which].polygon = 0;
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} else {
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setup_polygon (which);
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}
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_bounding_box_dirty = true;
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end_change ();
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}
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/** Set whether a given arrow head points into the line or
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* away from it.
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* @param which 0 or 1 to specify the arrow head to set up.
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* @param true if this arrow head should point out from the line,
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* otherwise false to point in.
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*/
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void
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Arrow::set_head_outward (int which, bool outward)
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{
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assert (which == 0 || which == 1);
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begin_change ();
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_heads[which].outward = outward;
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setup_polygon (which);
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_bounding_box_dirty = true;
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end_change ();
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}
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/** Set the height of a given arrow head.
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* @param which 0 or 1 to specify the arrow head to set up.
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* @param height Height of the arrow head in pixels.
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*/
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void
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Arrow::set_head_height (int which, Distance height)
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{
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assert (which == 0 || which == 1);
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begin_change ();
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_heads[which].height = height;
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setup_polygon (which);
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_bounding_box_dirty = true;
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end_change ();
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}
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/** Set the width of a given arrow head.
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* @param which 0 or 1 to specify the arrow head to set up.
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* @param width Width of the arrow head in pixels.
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*/
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void
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Arrow::set_head_width (int which, Distance width)
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{
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assert (which == 0 || which == 1);
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begin_change ();
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_heads[which].width = width;
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setup_polygon (which);
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_bounding_box_dirty = true;
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end_change ();
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}
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/** Set the width of our line, and the outline of our arrow(s).
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* @param width New width in pixels.
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*/
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void
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Arrow::set_outline_width (Distance width)
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{
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_line->set_outline_width (width);
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if (_heads[0].polygon) {
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_heads[0].polygon->set_outline_width (width);
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}
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if (_heads[1].polygon) {
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_heads[1].polygon->set_outline_width (width);
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}
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}
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/** Set the x position of our line.
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* @param x New x position in pixels (in our coordinate system).
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*/
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void
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Arrow::set_x (Coord x)
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{
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_line->set_x0 (x);
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_line->set_x1 (x);
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for (int i = 0; i < 2; ++i) {
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if (_heads[i].polygon) {
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_heads[i].polygon->set_x_position (x - _heads[i].width / 2);
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}
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}
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}
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/** Set the y position of end 0 of our line.
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* @param y0 New y0 position in pixels (in our coordinate system).
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*/
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void
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Arrow::set_y0 (Coord y0)
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{
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_line->set_y0 (y0);
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if (_heads[0].polygon) {
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_heads[0].polygon->set_y_position (y0);
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}
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}
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/** Set the y position of end 1 of our line.
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* @param y1 New y1 position in pixels (in our coordinate system).
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*/
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void
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Arrow::set_y1 (Coord y1)
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{
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_line->set_y1 (y1);
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if (_heads[1].polygon) {
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_heads[1].polygon->set_y_position (y1 - _heads[1].height);
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}
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}
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/** @return x position of our line in pixels (in our coordinate system) */
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Coord
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Arrow::x () const
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{
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return _line->x0 ();
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}
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/** @return y position of end 1 of our line in pixels (in our coordinate system) */
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Coord
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Arrow::y1 () const
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{
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return _line->y1 ();
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}
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/** Set up the polygon used to represent a particular arrow head.
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* @param which 0 or 1 to specify the arrow head to set up.
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*/
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void
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Arrow::setup_polygon (int which)
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{
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assert (which == 0 || which == 1);
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Points points;
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if ((which == 0 && _heads[which].outward) || (which == 1 && !_heads[which].outward)) {
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/* this is an arrow head pointing towards -ve y */
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points.push_back (Duple (_heads[which].width / 2, 0));
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points.push_back (Duple (_heads[which].width, _heads[which].height));
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points.push_back (Duple (0, _heads[which].height));
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} else {
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/* this is an arrow head pointing towards +ve y */
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points.push_back (Duple (0, 0));
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points.push_back (Duple (_heads[which].width, 0));
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points.push_back (Duple (_heads[which].width / 2, _heads[which].height));
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points.push_back (Duple (0, 0));
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}
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_heads[which].polygon->set (points);
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}
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/** Set the color of our line and arrow heads.
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* @param color New color.
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*/
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void
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Arrow::set_color (Color color)
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{
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_line->set_outline_color (color);
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for (int i = 0; i < 2; ++i) {
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if (_heads[i].polygon) {
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_heads[i].polygon->set_outline_color (color);
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_heads[i].polygon->set_fill_color (color);
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}
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}
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}
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bool
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Arrow::covers (Duple const & point) const
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{
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if (_heads[0].polygon && _heads[0].polygon->covers (point)) {
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return true;
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}
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if (_line && _line->covers (point)) {
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return true;
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}
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if (_heads[1].polygon && _heads[1].polygon->covers (point)) {
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return true;
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}
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return false;
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}
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