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.
286 lines
7.6 KiB
C++
286 lines
7.6 KiB
C++
/*
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Copyright (C) 2013 Paul Davis
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Copyright (C) 2014 Robin Gareus <robin@gareus.org>
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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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#include <cmath>
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#include <exception>
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#include <algorithm>
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#include "canvas/xfade_curve.h"
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#include "canvas/interpolated_curve.h"
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#include "canvas/utils.h"
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using namespace ArdourCanvas;
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using std::min;
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using std::max;
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XFadeCurve::XFadeCurve (Canvas* c)
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: Item (c)
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, points_per_segment (32)
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, _xfadeposition (Start)
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, _outline_color (0x000000ff)
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, _fill_color (0x22448880)
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{
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}
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XFadeCurve::XFadeCurve (Canvas* c, XFadePosition pos)
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: Item (c)
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, points_per_segment (32)
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, _xfadeposition (pos)
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, _outline_color (0x000000ff)
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, _fill_color (0x22448880)
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{
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}
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XFadeCurve::XFadeCurve (Group* g)
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: Item (g)
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, points_per_segment (32)
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, _xfadeposition (Start)
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, _outline_color (0x000000ff)
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, _fill_color (0x22448880)
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{
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}
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XFadeCurve::XFadeCurve (Group* g, XFadePosition pos)
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: Item (g)
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, points_per_segment (32)
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, _xfadeposition (pos)
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, _outline_color (0x000000ff)
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, _fill_color (0x22448880)
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{
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}
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void
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XFadeCurve::compute_bounding_box () const
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{
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if (!_in.points.empty() && !_out.points.empty()) {
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Rect bbox;
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Points::const_iterator i;
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if (!_in.points.empty()) {
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i = _in.points.begin();
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bbox.x0 = bbox.x1 = i->x;
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bbox.y0 = bbox.y1 = i->y;
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++i;
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while (i != _in.points.end()) {
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bbox.x0 = min (bbox.x0, i->x);
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bbox.y0 = min (bbox.y0, i->y);
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bbox.x1 = max (bbox.x1, i->x);
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bbox.y1 = max (bbox.y1, i->y);
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++i;
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}
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} else {
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i = _out.points.begin();
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bbox.x0 = bbox.x1 = i->x;
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bbox.y0 = bbox.y1 = i->y;
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}
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if (!_out.points.empty()) {
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i = _out.points.begin();
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while (i != _out.points.end()) {
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bbox.x0 = min (bbox.x0, i->x);
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bbox.y0 = min (bbox.y0, i->y);
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bbox.x1 = max (bbox.x1, i->x);
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bbox.y1 = max (bbox.y1, i->y);
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++i;
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}
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}
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_bounding_box = bbox.expand (1.0);
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} else {
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_bounding_box = boost::optional<Rect> ();
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}
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_bounding_box_dirty = false;
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}
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void
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XFadeCurve::set_inout (Points const & in, Points const & out)
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{
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if (_in.points == in && _out.points == out) {
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return;
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}
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begin_change ();
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_in.points = in;
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_out.points = out;
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_bounding_box_dirty = true;
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interpolate ();
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end_change ();
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}
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void
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XFadeCurve::set_points_per_segment (uint32_t n)
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{
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points_per_segment = n;
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interpolate ();
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redraw ();
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}
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void
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XFadeCurve::interpolate ()
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{
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_in.samples.clear ();
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InterpolatedCurve::interpolate (_in.points, points_per_segment, CatmullRomCentripetal, false, _in.samples);
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_in.n_samples = _in.samples.size();
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_out.samples.clear ();
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InterpolatedCurve::interpolate (_out.points, points_per_segment, CatmullRomCentripetal, false, _out.samples);
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_out.n_samples = _out.samples.size();
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}
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Cairo::Path *
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XFadeCurve::get_path(Rect const & area, Cairo::RefPtr<Cairo::Context> context, CanvasCurve const &c) const
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{
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assert(c.points.size() > 1);
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context->begin_new_path ();
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Duple window_space;
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if (c.points.size () == 2) {
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window_space = item_to_window (c.points.front(), false);
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context->move_to (window_space.x, window_space.y);
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window_space = item_to_window (c.points.back(), false);
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context->line_to (window_space.x, window_space.y);
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} else {
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/* find left and right-most sample */
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Points::size_type left = 0;
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Points::size_type right = c.n_samples;
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for (Points::size_type idx = 0; idx < c.n_samples - 1; ++idx) {
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left = idx;
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window_space = item_to_window (Duple (c.samples[idx].x, 0.0), false);
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if (window_space.x >= area.x0) break;
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}
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for (Points::size_type idx = c.n_samples; idx > left + 1; --idx) {
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window_space = item_to_window (Duple (c.samples[idx].x, 0.0), false);
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if (window_space.x <= area.x1) break;
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right = idx;
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}
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/* draw line between samples */
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window_space = item_to_window (Duple (c.samples[left].x, c.samples[left].y), false);
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context->move_to (window_space.x, window_space.y);
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for (uint32_t idx = left + 1; idx < right; ++idx) {
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window_space = item_to_window (Duple (c.samples[idx].x, c.samples[idx].y), false);
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context->line_to (window_space.x, window_space.y);
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}
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}
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return context->copy_path ();
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}
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void
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XFadeCurve::close_path(Rect const & area, Cairo::RefPtr<Cairo::Context> context, CanvasCurve const &c, bool inside) const
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{
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Duple window_space;
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if (inside) {
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window_space = item_to_window (Duple(c.points.back().x, area.height()), false);
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context->line_to (window_space.x, window_space.y);
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window_space = item_to_window (Duple(c.points.front().x, area.height()), false);
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context->line_to (window_space.x, window_space.y);
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context->close_path();
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} else {
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window_space = item_to_window (Duple(c.points.back().x, 0.0), false);
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context->line_to (window_space.x, window_space.y);
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window_space = item_to_window (Duple(c.points.front().x, 0.0), false);
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context->line_to (window_space.x, window_space.y);
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context->close_path();
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}
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}
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void
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XFadeCurve::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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if (!_bounding_box) { return; }
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if (_in.points.size() < 2) { return; }
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if (_out.points.size() < 2) { return; }
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Rect self = item_to_window (_bounding_box.get());
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boost::optional<Rect> d = self.intersection (area);
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assert (d);
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Rect draw = d.get ();
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context->save ();
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context->rectangle (draw.x0, draw.y0, draw.width(), draw.height());
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context->clip ();
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/* expand drawing area by several pixels on each side to avoid cairo stroking effects at the boundary.
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* they will still occur, but cairo's clipping will hide them.
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*/
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draw = draw.expand (4.0);
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Cairo::Path *path_in = get_path(draw, context, _in);
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Cairo::Path *path_out = get_path(draw, context, _out);
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Color outline_shaded = _outline_color;
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outline_shaded = 0.5 * (outline_shaded & 0xff) + (outline_shaded & ~0xff);
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Color fill_shaded = _fill_color;
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fill_shaded = 0.5 * (fill_shaded & 0xff) + (fill_shaded & ~0xff);
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#define IS (_xfadeposition == Start)
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/* fill primary fade */
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context->begin_new_path ();
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context->append_path (IS ? *path_in : *path_out);
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close_path(draw, context, IS ?_in : _out, false);
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set_source_rgba (context, _fill_color);
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context->fill ();
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/* fill background fade */
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context->save ();
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context->begin_new_path ();
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context->append_path (IS ? *path_in : *path_out);
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close_path(draw, context, IS ? _in : _out, true);
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context->set_fill_rule (Cairo::FILL_RULE_EVEN_ODD);
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context->clip ();
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context->begin_new_path ();
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context->append_path (IS ? *path_out: *path_in);
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close_path(draw, context, IS ? _out : _in, true);
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set_source_rgba (context, fill_shaded);
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context->set_fill_rule (Cairo::FILL_RULE_WINDING);
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context->fill ();
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context->restore ();
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/* draw lines over fills */
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set_source_rgba (context, IS ? _outline_color : outline_shaded);
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context->set_line_width (IS ? 1.0 : .5);
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context->begin_new_path ();
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context->append_path (*path_in);
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context->stroke();
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set_source_rgba (context, IS ? outline_shaded :_outline_color);
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context->set_line_width (IS ? .5 : 1.0);
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context->begin_new_path ();
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context->append_path (*path_out);
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context->stroke();
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context->restore ();
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delete path_in;
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delete path_out;
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}
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