add initial (untested) implementation of canvas ruler item
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libs/canvas/canvas/ruler.h
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libs/canvas/canvas/ruler.h
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/*
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Copyright (C) 2014 Paul Davis
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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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#ifndef __CANVAS_RULER_H__
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#define __CANVAS_RULER_H__
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#include <string>
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#include <vector>
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#include "canvas/item.h"
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#include "canvas/fill.h"
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#include "canvas/outline.h"
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namespace ArdourCanvas
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{
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class LIBCANVAS_API Ruler : virtual public Item, public Fill, public Outline
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{
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public:
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struct Mark {
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enum Style {
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Major,
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Minor,
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Micro
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};
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std::string label;
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double position;
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Style style;
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};
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struct Metric {
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Metric () : units_per_pixel (0) {}
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virtual ~Metric() {}
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double units_per_pixel;
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/* lower and upper and sample positions, which are also canvas coordinates
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*/
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virtual int get_marks (std::vector<Mark>&, double lower, double upper, int maxchars) const = 0;
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};
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Ruler (Group *, const Metric& m);
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void set_range (double lower, double upper);
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void set_size (Rect const&);
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void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
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void compute_bounding_box () const;
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private:
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const Metric& _metric;
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Rect _rect;
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/* lower and upper and sample positions, which are also canvas coordinates
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*/
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Coord _lower;
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Coord _upper;
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};
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}
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#endif
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117
libs/canvas/ruler.cc
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117
libs/canvas/ruler.cc
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/*
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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 "pbd/compose.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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{
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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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_lower = l;
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_upper = u;
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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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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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vector<Mark> marks;
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Distance height = self.height();
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_metric.get_marks (marks, _lower, _upper, 50);
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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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/* draw ticks */
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setup_outline_context (cr);
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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 = self.x0 + ((m->position - _lower) / _metric.units_per_pixel);
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pos.y = self.y1; /* bottom edge */
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cr->move_to (pos.x, pos.y);
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switch (m->style) {
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case Mark::Major:
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cr->rel_move_to (0, -height);
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break;
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case Mark::Minor:
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cr->rel_move_to (0, -(height/2.0));
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break;
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case Mark::Micro:
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cr->rel_move_to (0, pos.y-(height/4.0));
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break;
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}
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cr->stroke ();
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}
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/* done! */
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}
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