Robin Gareus
601c317d70
make libwidget independent of libcanvas. Confine basics to pbd and gtkmm2ext.
292 lines
6.7 KiB
C++
292 lines
6.7 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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: Container (c)
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{
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setup ();
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}
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Arrow::Arrow (Item* parent)
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: Container (parent)
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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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void
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Arrow::compute_bounding_box () const
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{
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/* Compute our bounding box manually rather than using the default
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container algorithm, since having the bounding box with origin other
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than zero causes strange problems for mysterious reasons. */
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const double outline_pad = 0.5 + (_line->outline_width() / 2.0);
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const double head_width = std::max(_heads[0].width, _heads[1].width);
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_bounding_box = Rect(0,
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0,
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_line->x1() + (head_width / 2.0) + outline_pad,
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_line->y1());
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_bounding_box_dirty = false;
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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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_bounding_box_dirty = true;
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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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_bounding_box_dirty = true;
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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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_bounding_box_dirty = true;
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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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_bounding_box_dirty = true;
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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 (Gtkmm2ext::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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