85 lines
1.5 KiB
C++
85 lines
1.5 KiB
C++
#include "pbd/xml++.h"
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#include "canvas/line_set.h"
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#include "canvas/utils.h"
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using namespace std;
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using namespace ArdourCanvas;
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/* XXX: hard-wired to horizontal only */
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class LineSorter {
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public:
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bool operator() (LineSet::Line& a, LineSet::Line& b) {
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return a.y < b.y;
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}
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};
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LineSet::LineSet (Group* parent)
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: Item (parent)
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, _height (0)
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{
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}
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void
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LineSet::compute_bounding_box () const
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{
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if (_lines.empty ()) {
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_bounding_box = boost::optional<Rect> ();
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_bounding_box_dirty = false;
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return;
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}
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_bounding_box = Rect (0, _lines.front().y, COORD_MAX, min (_height, _lines.back().y));
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_bounding_box_dirty = false;
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}
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void
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LineSet::set_height (Distance height)
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{
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begin_change ();
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_height = height;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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LineSet::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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for (list<Line>::const_iterator i = _lines.begin(); i != _lines.end(); ++i) {
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if (i->y > area.y1) {
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break;
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} else if (i->y > area.y0) {
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set_source_rgba (context, i->color);
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context->set_line_width (i->width);
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context->move_to (area.x0, i->y);
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context->line_to (area.x1, i->y);
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context->stroke ();
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}
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}
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}
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void
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LineSet::add (Coord y, Distance width, Color color)
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{
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begin_change ();
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_lines.push_back (Line (y, width, color));
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_lines.sort (LineSorter ());
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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LineSet::clear ()
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{
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begin_change ();
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_lines.clear ();
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_bounding_box_dirty = true;
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end_change ();
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}
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