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livetrax/libs/canvas/rectangle.cc

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/*
* Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2013-2018 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2014-2017 Robin Gareus <robin@gareus.org>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <iostream>
#include <cairomm/context.h>
#include "pbd/compose.h"
#include "gtkmm2ext/utils.h"
#include "canvas/canvas.h"
#include "canvas/rectangle.h"
#include "canvas/debug.h"
using namespace std;
using namespace ArdourCanvas;
/* Rectangle notes
*
* A Rectangle is defined by an ArdourCanvas::Rect which encloses every pixel
* that the Rectangle might draw. If the Rect is (0, 0, 10, 10) then a filled
* version of the Rectangle will paint every pixel up to and including those
* edges.
*
* If there is a border to the Rectangle, it will be drawn *INSIDE* the
* boundary given by the Rect. The border will include (at minimum) the outer
* pixel edge(s) of the Rectangle.
*
* This makes ArdourCanvas::Rectangle follow the semantics implied by CSS's
* box-sizing: border-box, rather than box-sizing: content-box
*/
Rectangle::Rectangle (Canvas* c)
: Item (c)
, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
, _corner_radius (0.0)
{
}
Rectangle::Rectangle (Canvas* c, Rect const & rect)
: Item (c)
, _rect (rect)
, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
, _corner_radius (0.0)
{
}
Rectangle::Rectangle (Item* parent)
: Item (parent)
, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
, _corner_radius (0.0)
{
}
Rectangle::Rectangle (Item* parent, Rect const & rect)
: Item (parent)
, _rect (rect)
, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
, _corner_radius (0.0)
{
}
void
Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
/* Note that item_to_window() already takes _position into account (as
part of item_to_canvas()
*/
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Rect self (item_to_window (_rect));
const Rect draw = self.intersection (area);
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if (!draw) {
return;
}
if (_corner_radius) {
context->save ();
Gtkmm2ext::rounded_rectangle (context, self.x0, self.y0, self.width(), self.height(), _corner_radius);
context->clip ();
}
if (_fill && !_transparent) {
if (_stops.empty()) {
setup_fill_context (context);
} else {
setup_gradient_context (context, self, Duple (draw.x0, draw.y0));
}
if (_corner_radius) {
Gtkmm2ext::rounded_rectangle (context, draw.x0, draw.y0, draw.width(), draw.height(), _corner_radius);
} else {
context->rectangle (draw.x0, draw.y0, draw.width(), draw.height());
}
context->fill ();
}
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if (_outline && _outline_width && _outline_what) {
setup_outline_context (context);
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const double shift = _outline_width * 0.5;
self = self.translate (Duple (shift, shift));
if (_outline_what == ALL) {
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if (_corner_radius) {
Gtkmm2ext::rounded_rectangle (context, self.x0, self.y0, self.width() - _outline_width, self.height() - _outline_width, _corner_radius);
} else {
context->rectangle (self.x0, self.y0, self.width() - _outline_width, self.height() - _outline_width);
}
} else {
if (_outline_what & LEFT) {
context->move_to (self.x0, self.y0);
context->line_to (self.x0, self.y1);
}
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if (_outline_what & TOP) {
context->move_to (self.x0, self.y0);
context->line_to (self.x1, self.y0);
}
if (_outline_what & BOTTOM) {
context->move_to (self.x0, self.y1);
context->line_to (self.x1, self.y1);
}
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if (_outline_what & RIGHT) {
context->move_to (self.x1, self.y0);
context->line_to (self.x1, self.y1);
}
}
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context->stroke ();
}
if (_corner_radius) {
context->restore ();
}
render_children (area, context);
}
void
Rectangle::size_request (double& w, double& h) const
{
w = _rect.width();
h = _rect.height();
}
void
Rectangle::compute_bounding_box () const
{
if (_rect.empty ()) {
_bounding_box = Rect ();
} else if (_outline && _outline_width && _outline_what) {
_bounding_box = _rect.fix().expand (ceil (_outline_width * 0.5));
} else {
_bounding_box = _rect.fix();
}
set_bbox_clean ();
}
void
Rectangle::set (Rect const & r)
{
/* We don't update the bounding box here; it's just
as cheap to do it when asked.
*/
if (r != _rect) {
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begin_change ();
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_rect = r;
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set_bbox_dirty ();
end_change ();
}
}
void
Rectangle::set_x0 (Coord x0)
{
if (x0 != _rect.x0) {
begin_change ();
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_rect.x0 = x0;
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set_bbox_dirty ();
end_change ();
}
}
void
Rectangle::set_y0 (Coord y0)
{
if (y0 != _rect.y0) {
begin_change ();
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_rect.y0 = y0;
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set_bbox_dirty ();
end_change();
}
}
void
Rectangle::set_x1 (Coord x1)
{
if (x1 != _rect.x1) {
begin_change ();
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_rect.x1 = x1;
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set_bbox_dirty ();
end_change ();
}
}
void
Rectangle::set_y1 (Coord y1)
{
if (y1 != _rect.y1) {
begin_change ();
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_rect.y1 = y1;
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set_bbox_dirty ();
end_change ();
}
}
void
Rectangle::set_outline_what (What what)
{
if (what != _outline_what) {
begin_visual_change ();
_outline_what = what;
end_visual_change ();
}
}
double
Rectangle::vertical_fraction (double y) const
{
/* y is in canvas coordinates */
Duple i (canvas_to_item (Duple (0, y)));
Rect r = bounding_box();
if (!r) {
return 0; /* not really correct, but what else can we do? */
}
Rect bbox (r);
if (i.y < bbox.y0 || i.y >= bbox.y1) {
return 0;
}
/* convert to fit Cairo origin model (origin at upper left)
*/
return 1.0 - ((i.y - bbox.y0) / bbox.height());
}
void
Rectangle::_size_allocate (Rect const & r)
{
Item::_size_allocate (r);
if (_layout_sensitive) {
/* Set _position use the upper left of the Rect, and then set
the _rect member with values that use _position as the
origin.
*/
Rect r2 (0, 0, r.x1 - r.x0, r.y1 - r.y0);
set (r2);
}
}
void
Rectangle::set_corner_radius (double r)
{
/* note: this does not change the bounding box */
begin_change ();
_corner_radius = r;
end_change ();
}
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void
Rectangle::dump (std::ostream & o) const
{
Item::dump (o);
o << _canvas->indent() << " outline: w " << outline_width() << " color " << outline_color() << " what 0x" << std::hex << _outline_what << std::dec << endl;
}