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livetrax/libs/canvas/ruler.cc

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/*
Copyright (C) 2014 Paul Davis
Author: Carl Hetherington <cth@carlh.net>
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., 675 Mass Ave, Cambridge, MA 02139, 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/utils.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)
, _need_marks (true)
{
}
Ruler::Ruler (Canvas* c, const Metric& m, Rect const& r)
: Rectangle (c, r)
, _metric (m)
, _lower (0)
, _upper (0)
, _need_marks (true)
{
}
Ruler::Ruler (Item* parent, const Metric& m)
: Rectangle (parent)
, _metric (m)
, _lower (0)
, _upper (0)
, _need_marks (true)
{
}
Ruler::Ruler (Item* parent, const Metric& m, Rect const& r)
: Rectangle (parent, r)
, _metric (m)
, _lower (0)
, _upper (0)
, _need_marks (true)
{
}
void
Ruler::set_range (double l, double 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 ();
_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()));
boost::optional<Rect> i = self.intersection (area);
if (!i) {
return;
}
Rect intersection (i.get());
Distance height = self.height();
if (_need_marks) {
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 ();
/* draw ticks + text */
Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (cr);
if (_font_description) {
layout->set_font_description (*_font_description);
}
for (vector<Mark>::const_iterator m = marks.begin(); m != marks.end(); ++m) {
Duple pos;
pos.x = floor ((m->position - _lower) / _metric.units_per_pixel);
pos.y = self.y1; /* bottom edge */
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);
}
switch (m->style) {
case Mark::Major:
cr->rel_line_to (0, -height);
break;
case Mark::Minor:
cr->rel_line_to (0, -height/2.0);
break;
case Mark::Micro:
cr->rel_line_to (0, -height/4.0);
break;
}
cr->stroke ();
/* and the text */
if (!m->label.empty()) {
Pango::Rectangle logical;
layout->set_text (m->label);
logical = layout->get_pixel_logical_extents ();
cr->move_to (pos.x + 2.0, self.y0 + logical.get_y());
layout->show_in_cairo_context (cr);
}
}
/* done! */
}