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livetrax/libs/canvas/ruler.cc

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/*
* Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2014-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <algorithm>
#include <cairomm/context.h>
#include <pangomm/layout.h>
#include "canvas/ruler.h"
#include "canvas/types.h"
#include "canvas/debug.h"
#include "canvas/canvas.h"
using namespace std;
using namespace ArdourCanvas;
Ruler::Ruler (Canvas* c, const Metric* m)
: Rectangle (c)
, _metric (m)
, _lower (0)
, _upper (0)
, _divide_height (-1.0)
, _font_description (0)
, _second_font_description (0)
, _need_marks (true)
{
}
Ruler::Ruler (Canvas* c, const Metric* m, Rect const& r)
: Rectangle (c, r)
, _metric (m)
, _lower (0)
, _upper (0)
, _divide_height (-1.0)
, _font_description (0)
, _second_font_description (0)
, _need_marks (true)
{
}
Ruler::Ruler (Item* parent, const Metric* m)
: Rectangle (parent)
, _metric (m)
, _lower (0)
, _upper (0)
, _divide_height (-1.0)
, _font_description (0)
, _second_font_description (0)
, _need_marks (true)
{
}
Ruler::Ruler (Item* parent, const Metric* m, Rect const& r)
: Rectangle (parent, r)
, _metric (m)
, _lower (0)
, _upper (0)
, _divide_height (-1.0)
, _font_description (0)
, _second_font_description (0)
, _need_marks (true)
{
}
void
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Ruler::set_range (int64_t l, int64_t u)
{
begin_visual_change ();
_lower = l;
_upper = u;
_need_marks = true;
end_visual_change ();
}
void
Ruler::set_font_description (Pango::FontDescription fd)
{
begin_visual_change ();
delete _font_description;
_font_description = new Pango::FontDescription (fd);
end_visual_change ();
}
void
Ruler::set_second_font_description (Pango::FontDescription fd)
{
begin_visual_change ();
delete _second_font_description;
_second_font_description = new Pango::FontDescription (fd);
end_visual_change ();
}
void
Ruler::render (Rect const & area, Cairo::RefPtr<Cairo::Context> cr) const
{
if (_lower == _upper) {
/* nothing to draw */
return;
}
Rect self (item_to_window (get()));
Rect i = self.intersection (area);
if (!i) {
return;
}
Rect intersection (i);
Distance height = self.height();
if (_need_marks && _metric) {
marks.clear ();
_metric->get_marks (marks, _lower, _upper, 50);
_need_marks = false;
}
/* draw background */
setup_fill_context (cr);
cr->rectangle (intersection.x0, intersection.y0, intersection.width(), intersection.height());
cr->fill ();
/* switch to outline context */
setup_outline_context (cr);
/* draw line on lower edge as a separator */
if (_outline_width == 1.0) {
/* Cairo single pixel line correction */
cr->move_to (self.x0, self.y1+0.5);
cr->line_to (self.x1, self.y1+0.5);
} else {
cr->move_to (self.x0, self.y1);
cr->line_to (self.x1, self.y1);
}
cr->stroke ();
if (_metric) {
/* draw ticks + text */
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Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (cr);
Pango::FontDescription* last_font_description = 0;
Coord prev = -1;
for (vector<Mark>::const_iterator m = marks.begin(); m != marks.end(); ++m) {
Duple pos;
Pango::FontDescription* fd = (m->style == Mark::Major) ? (_second_font_description ? _second_font_description : _font_description) : _font_description;
pos.x = round ((m->position - _lower) / _metric->units_per_pixel);
pos.y = self.y1; /* bottom edge */
if (fd != last_font_description) {
layout->set_font_description (*fd);
last_font_description = fd;
}
/* and the text */
if (!m->label.empty()) {
Pango::Rectangle logical;
layout->set_text (m->label);
logical = layout->get_pixel_logical_extents ();
if ((prev >= 0.) && ((pos.x - prev) < (6. + logical.get_width()))) {
continue;
}
if (_divide_height >= 0) {
cr->move_to (pos.x + 2.0, self.y0 + _divide_height + logical.get_y() + 2.0); /* 2 pixel padding below divider */
} else {
cr->move_to (pos.x + 2.0, self.y0 + logical.get_y() + .5 * (height - logical.get_height()));
}
layout->show_in_cairo_context (cr);
prev = pos.x;
}
if (_outline_width == 1.0) {
/* Cairo single pixel line correction */
cr->move_to (pos.x + 0.5, pos.y);
} else {
cr->move_to (pos.x, pos.y);
}
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switch (m->style) {
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case Mark::Major:
if (_divide_height >= 0) {
cr->rel_line_to (0, -_divide_height);
} else {
cr->rel_line_to (0, -height);
}
break;
case Mark::Minor:
cr->rel_line_to (0, -height/3.0);
break;
case Mark::Micro:
cr->rel_line_to (0, -height/5.0);
break;
}
cr->stroke ();
}
}
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if (_divide_height >= 0.0) {
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cr->set_line_width (1.0);
Gtkmm2ext::set_source_rgba (cr, _divider_color_top);
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cr->move_to (self.x0, self.y0 + _divide_height-1.0+0.5);
cr->line_to (self.x1, self.y0 + _divide_height-1.0+0.5);
cr->stroke ();
Gtkmm2ext::set_source_rgba (cr, _divider_color_bottom);
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cr->move_to (self.x0, self.y0 + _divide_height+0.5);
cr->line_to (self.x1, self.y0 + _divide_height+0.5);
cr->stroke ();
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}
render_children (area, cr);
/* done! */
}
void
Ruler::set_divide_height (double h)
{
_divide_height = h;
}
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void
Ruler::set_divide_colors (Gtkmm2ext::Color t, Gtkmm2ext::Color b)
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{
_divider_color_bottom = b;
_divider_color_top = t;
}
void
Ruler::set_metric (const Metric* m)
{
_metric = m;
_need_marks = true;
redraw ();
}