+/*
+ 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/xml++.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 (Group* parent)
- : Item (parent)
- , Outline (parent)
+Line::Line (Canvas* c)
+ : Item (c)
{
+}
+Line::Line (Item* parent)
+ : Item (parent)
+{
}
void
bbox.x1 = max (_points[0].x, _points[1].x);
bbox.y1 = max (_points[0].y, _points[1].y);
- bbox = bbox.expand (_outline_width / 2);
+ bbox = bbox.expand (0.5 + (_outline_width / 2));
_bounding_box = bbox;
_bounding_box_dirty = false;
{
setup_outline_context (context);
- Duple plot[2] = {
- Duple (min (_points[0].x, CAIRO_MAX), min (_points[0].y, CAIRO_MAX)),
- Duple (min (_points[1].x, CAIRO_MAX), min (_points[1].y, CAIRO_MAX))
- };
+ 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 (plot[0].x, plot[0].y);
- context->line_to (plot[1].x, plot[1].y);
+ context->move_to (p0.x, p0.y);
+ context->line_to (p1.x, p1.y);
context->stroke ();
}
void
Line::set (Duple a, Duple b)
{
- begin_change ();
-
- _points[0] = a;
- _points[1] = b;
-
- _bounding_box_dirty = true;
- end_change ();
-
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+ if (a != _points[0] || b != _points[1]) {
+ begin_change ();
+
+ _points[0] = a;
+ _points[1] = b;
+
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
-Line::set_x0 (Coord x0)
+Line::set_x (Coord x0, Coord x1)
{
- begin_change ();
-
- _points[0].x = x0;
-
- _bounding_box_dirty = true;
- end_change ();
+ 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 ();
+ }
+}
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+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)
{
- begin_change ();
-
- _points[0].y = y0;
-
- _bounding_box_dirty = true;
- end_change ();
+ 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)
{
- begin_change ();
-
- _points[1].x = x1;
-
- _bounding_box_dirty = true;
- end_change ();
-
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
+ if (x1 != _points[1].x) {
+ begin_change ();
+
+ _points[1].x = x1;
+
+ _bounding_box_dirty = true;
+ end_change ();
+ }
}
void
Line::set_y1 (Coord y1)
{
- begin_change ();
+ if (y1 != _points[1].y) {
+ begin_change ();
+
+ _points[1].y = y1;
+
+ _bounding_box_dirty = true;
+ end_change ();
+ }
+}
- _points[1].y = y1;
+bool
+Line::covers (Duple const & point) const
+{
+ const Duple p = window_to_item (point);
+ static const Distance threshold = 2.0;
- _bounding_box_dirty = true;
- end_change ();
+ /* this quick check works for vertical and horizontal lines, which are
+ * common.
+ */
- DEBUG_TRACE (PBD::DEBUG::CanvasItemsDirtied, "canvas item dirty: line change\n");
-}
+ if (_points[0].x == _points[1].x) {
+ /* line is vertical, just check x coordinate */
+ return fabs (_points[0].x - p.x) <= threshold;
+ }
-XMLNode *
-Line::get_state () const
-{
- XMLNode* node = new XMLNode ("Line");
-#ifdef CANVAS_DEBUG
- if (!name.empty ()) {
- node->add_property ("name", name);
+ if (_points[0].y == _points[1].y) {
+ /* line is horizontal, just check y coordinate */
+ return fabs (_points[0].y - p.y) <= threshold;
}
-#endif
- node->add_property ("x0", string_compose ("%1", _points[0].x));
- node->add_property ("y0", string_compose ("%1", _points[0].y));
- node->add_property ("x1", string_compose ("%1", _points[1].x));
- node->add_property ("y1", string_compose ("%1", _points[1].y));
-
- add_item_state (node);
- add_outline_state (node);
- return node;
-}
-void
-Line::set_state (XMLNode const * node)
-{
- _points[0].x = atof (node->property("x0")->value().c_str());
- _points[0].y = atof (node->property("y0")->value().c_str());
- _points[1].x = atof (node->property("x1")->value().c_str());
- _points[1].y = atof (node->property("y1")->value().c_str());
+ Duple at;
+ double t;
+ Duple a (_points[0]);
+ Duple b (_points[1]);
+ const Rect visible (window_to_item (_canvas->visible_area()));
- set_item_state (node);
- set_outline_state (node);
+ /*
+ 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;
+ }
- _bounding_box_dirty = true;
+ return false;
}
projects / ardour.git / blobdiff