Items no longer need a parent group (they require a Canvas pointer instead), so all constructors have been rationalized and have two variants, one with a parent and one with a canvas. All Items now inherit from Fill and Outline, to banish diagonal inheritance and virtual base classes and all that. There were zero changes to the Ardour GUI arising from these changes.
211 lines
4.2 KiB
C++
211 lines
4.2 KiB
C++
/*
|
|
Copyright (C) 2011-2013 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 "pbd/compose.h"
|
|
#include "canvas/line.h"
|
|
#include "canvas/types.h"
|
|
#include "canvas/debug.h"
|
|
#include "canvas/utils.h"
|
|
#include "canvas/canvas.h"
|
|
|
|
using namespace std;
|
|
using namespace ArdourCanvas;
|
|
|
|
Line::Line (Canvas* c)
|
|
: Item (c)
|
|
{
|
|
}
|
|
|
|
Line::Line (Group* group)
|
|
: Item (group)
|
|
{
|
|
}
|
|
|
|
void
|
|
Line::compute_bounding_box () const
|
|
{
|
|
Rect bbox;
|
|
|
|
bbox.x0 = min (_points[0].x, _points[1].x);
|
|
bbox.y0 = min (_points[0].y, _points[1].y);
|
|
bbox.x1 = max (_points[0].x, _points[1].x);
|
|
bbox.y1 = max (_points[0].y, _points[1].y);
|
|
|
|
bbox = bbox.expand (0.5 + (_outline_width / 2));
|
|
|
|
_bounding_box = bbox;
|
|
_bounding_box_dirty = false;
|
|
}
|
|
|
|
void
|
|
Line::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
|
|
{
|
|
setup_outline_context (context);
|
|
|
|
Duple p0 = item_to_window (Duple (_points[0].x, _points[0].y));
|
|
Duple p1 = item_to_window (Duple (_points[1].x, _points[1].y));
|
|
|
|
if (_outline_width <= 1.0) {
|
|
/* See Cairo FAQ on single pixel lines to understand why we add 0.5
|
|
*/
|
|
|
|
const Duple half_a_pixel (0.5, 0.5);
|
|
p0 = p0.translate (half_a_pixel);
|
|
p1 = p1.translate (half_a_pixel);
|
|
}
|
|
|
|
context->move_to (p0.x, p0.y);
|
|
context->line_to (p1.x, p1.y);
|
|
context->stroke ();
|
|
}
|
|
|
|
void
|
|
Line::set (Duple a, Duple b)
|
|
{
|
|
if (a != _points[0] || b != _points[1]) {
|
|
begin_change ();
|
|
|
|
_points[0] = a;
|
|
_points[1] = b;
|
|
|
|
_bounding_box_dirty = true;
|
|
end_change ();
|
|
}
|
|
}
|
|
|
|
void
|
|
Line::set_x (Coord x0, Coord x1)
|
|
{
|
|
if (x0 != _points[0].x || x1 != _points[1].x) {
|
|
begin_change ();
|
|
|
|
_points[0].x = x0;
|
|
_points[1].x = x1;
|
|
|
|
_bounding_box_dirty = true;
|
|
end_change ();
|
|
}
|
|
}
|
|
|
|
void
|
|
Line::set_x0 (Coord x0)
|
|
{
|
|
if (x0 != _points[0].x) {
|
|
begin_change ();
|
|
|
|
_points[0].x = x0;
|
|
|
|
_bounding_box_dirty = true;
|
|
end_change ();
|
|
}
|
|
}
|
|
|
|
void
|
|
Line::set_y0 (Coord y0)
|
|
{
|
|
if (y0 != _points[0].y) {
|
|
begin_change ();
|
|
|
|
_points[0].y = y0;
|
|
|
|
_bounding_box_dirty = true;
|
|
end_change ();
|
|
}
|
|
|
|
DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
|
|
}
|
|
|
|
void
|
|
Line::set_x1 (Coord x1)
|
|
{
|
|
if (x1 != _points[1].x) {
|
|
begin_change ();
|
|
|
|
_points[1].x = x1;
|
|
|
|
_bounding_box_dirty = true;
|
|
end_change ();
|
|
}
|
|
}
|
|
|
|
void
|
|
Line::set_y1 (Coord y1)
|
|
{
|
|
if (y1 != _points[1].y) {
|
|
begin_change ();
|
|
|
|
_points[1].y = y1;
|
|
|
|
_bounding_box_dirty = true;
|
|
end_change ();
|
|
}
|
|
}
|
|
|
|
bool
|
|
Line::covers (Duple const & point) const
|
|
{
|
|
const Duple p = window_to_item (point);
|
|
static const Distance threshold = 2.0;
|
|
|
|
/* this quick check works for vertical and horizontal lines, which are
|
|
* common.
|
|
*/
|
|
|
|
if (_points[0].x == _points[1].x) {
|
|
/* line is vertical, just check x coordinate */
|
|
return fabs (_points[0].x - p.x) <= threshold;
|
|
}
|
|
|
|
if (_points[0].y == _points[1].y) {
|
|
/* line is horizontal, just check y coordinate */
|
|
return fabs (_points[0].y - p.y) <= threshold;
|
|
}
|
|
|
|
Duple at;
|
|
double t;
|
|
Duple a (_points[0]);
|
|
Duple b (_points[1]);
|
|
const Rect visible (window_to_item (_canvas->visible_area()));
|
|
|
|
/*
|
|
Clamp the line endpoints to the visible area of the canvas. If we do
|
|
not do this, we have a line segment extending to COORD_MAX and our
|
|
math goes wrong.
|
|
*/
|
|
|
|
a.x = min (a.x, visible.x1);
|
|
a.y = min (a.y, visible.y1);
|
|
b.x = min (b.x, visible.x1);
|
|
b.y = min (b.y, visible.y1);
|
|
|
|
double d = distance_to_segment_squared (p, a, b, t, at);
|
|
|
|
if (t < 0.0 || t > 1.0) {
|
|
return false;
|
|
}
|
|
|
|
if (d < threshold) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|