174 lines
3.6 KiB
C++
174 lines
3.6 KiB
C++
/*
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Copyright (C) 2014 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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#include <algorithm>
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#include <cairomm/context.h>
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#include <pangomm/layout.h>
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#include "canvas/ruler.h"
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#include "canvas/types.h"
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#include "canvas/debug.h"
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#include "canvas/utils.h"
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#include "canvas/canvas.h"
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using namespace std;
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using namespace ArdourCanvas;
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Ruler::Ruler (Group *p, const Metric& m)
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: Item (p)
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, Fill (p)
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, Outline (p)
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, _metric (m)
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, _lower (0)
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, _upper (0)
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, _need_marks (true)
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{
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_fill_color = rgba_to_color (0, 0, 0, 1.0);
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_outline_color = rgba_to_color (1.0, 1.0, 1.0, 1.0);
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}
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void
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Ruler::set_range (double l, double u)
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{
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begin_visual_change ();
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_lower = l;
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_upper = u;
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_need_marks = true;
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end_visual_change ();
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}
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void
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Ruler::set_font_description (Pango::FontDescription fd)
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{
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begin_visual_change ();
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_font_description = new Pango::FontDescription (fd);
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end_visual_change ();
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}
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void
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Ruler::set_size (Rect const & area)
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{
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if (_rect != area) {
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begin_visual_change ();
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_rect = area;
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_bounding_box_dirty = true;
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end_visual_change ();
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}
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}
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void
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Ruler::compute_bounding_box () const
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{
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if (!_rect.empty()) {
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_bounding_box = _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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Ruler::render (Rect const & area, Cairo::RefPtr<Cairo::Context> cr) const
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{
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if (_lower == _upper) {
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/* nothing to draw */
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return;
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}
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Rect self (item_to_window (_rect));
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boost::optional<Rect> i = self.intersection (area);
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if (!i) {
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return;
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}
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Rect intersection (i.get());
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Distance height = self.height();
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if (_need_marks) {
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marks.clear ();
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_metric.get_marks (marks, _lower, _upper, 50);
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_need_marks = false;
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}
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/* draw background */
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setup_fill_context (cr);
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cr->rectangle (intersection.x0, intersection.y0, intersection.width(), intersection.height());
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cr->fill ();
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/* switch to outline context */
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setup_outline_context (cr);
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/* draw line on lower edge as a separator */
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cr->move_to (self.x0, self.y1-0.5);
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cr->line_to (self.x1, self.y1-0.5);
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cr->stroke ();
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/* draw ticks + text */
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Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (cr);
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if (_font_description) {
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layout->set_font_description (*_font_description);
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}
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for (vector<Mark>::const_iterator m = marks.begin(); m != marks.end(); ++m) {
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Duple pos;
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pos.x = floor ((m->position - _lower) / _metric.units_per_pixel);
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pos.y = self.y1; /* bottom edge */
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if (_outline_width == 1.0) {
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cr->move_to (pos.x + 0.5, pos.y);
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} else {
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cr->move_to (pos.x, pos.y);
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}
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switch (m->style) {
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case Mark::Major:
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cr->rel_line_to (0, -height);
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break;
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case Mark::Minor:
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cr->rel_line_to (0, -height/2.0);
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break;
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case Mark::Micro:
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cr->rel_line_to (0, -height/4.0);
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break;
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}
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cr->stroke ();
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/* and the text */
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if (!m->label.empty()) {
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Pango::Rectangle logical;
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layout->set_text (m->label);
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logical = layout->get_pixel_logical_extents ();
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cr->move_to (pos.x + 2.0, self.y0 + logical.get_y());
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layout->show_in_cairo_context (cr);
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}
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}
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/* done! */
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}
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