make libwidget independent of libcanvas. Confine basics to pbd and gtkmm2ext.
291 lines
6.4 KiB
C++
291 lines
6.4 KiB
C++
/*
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Copyright (C) 2011-2013 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 <iostream>
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#include <cairomm/context.h>
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#include "pbd/stacktrace.h"
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#include "pbd/compose.h"
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#include "canvas/canvas.h"
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#include "canvas/rectangle.h"
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#include "canvas/debug.h"
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using namespace std;
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using namespace ArdourCanvas;
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Rectangle::Rectangle (Canvas* c)
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: Item (c)
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, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
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{
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}
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Rectangle::Rectangle (Canvas* c, Rect const & rect)
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: Item (c)
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, _rect (rect)
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, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
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{
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}
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Rectangle::Rectangle (Item* parent)
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: Item (parent)
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, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
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{
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}
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Rectangle::Rectangle (Item* parent, Rect const & rect)
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: Item (parent)
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, _rect (rect)
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, _outline_what ((What) (LEFT | RIGHT | TOP | BOTTOM))
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{
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}
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Rect
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Rectangle::get_self_for_render () const
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{
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/* In general, a Rectangle will have a _position of (0,0) within its
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parent, and its extent is actually defined by _rect. But in the
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unusual case that _position is set to something other than (0,0),
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we should take that into account when rendering.
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*/
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return item_to_window (_rect.translate (_position), false);
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}
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void
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Rectangle::render_self (Rect const & area, Cairo::RefPtr<Cairo::Context> context, Rect self) const
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{
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Rect r = self.intersection (area);
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if (!r) {
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return;
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}
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Rect draw = r;
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if (_fill && !_transparent) {
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if (_stops.empty()) {
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setup_fill_context (context);
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} else {
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setup_gradient_context (context, self, Duple (draw.x0, draw.y0));
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}
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context->rectangle (draw.x0, draw.y0, draw.width(), draw.height());
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context->fill ();
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}
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if (_outline && _outline_width && _outline_what) {
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setup_outline_context (context);
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/* the goal here is that if the border is 1 pixel
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* thick, it will precisely align with the corner
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* coordinates of the rectangle. So if the rectangle
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* has a left edge at 0 and a right edge at 10, then
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* the left edge must span 0..1, the right edge
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* must span 10..11 because the first and final pixels
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* to be colored are actually "at" 0.5 and 10.5 (midway
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* between the integer coordinates).
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*
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* See the Cairo FAQ on single pixel lines for more
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* detail.
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*/
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if (fmod (_outline_width, 2.0) != 0.0) {
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const double shift = _outline_width * 0.5;
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self = self.translate (Duple (shift, shift));
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}
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if (_outline_what == What (LEFT|RIGHT|BOTTOM|TOP)) {
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context->rectangle (self.x0, self.y0, self.width(), self.height());
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} else {
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if (_outline_what & LEFT) {
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context->move_to (self.x0, self.y0);
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context->line_to (self.x0, self.y1);
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}
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if (_outline_what & TOP) {
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context->move_to (self.x0, self.y0);
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context->line_to (self.x1, self.y0);
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}
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if (_outline_what & BOTTOM) {
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context->move_to (self.x0, self.y1);
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context->line_to (self.x1, self.y1);
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}
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if (_outline_what & RIGHT) {
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context->move_to (self.x1, self.y0);
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context->line_to (self.x1, self.y1);
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}
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}
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context->stroke ();
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}
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}
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void
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Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
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{
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render_self (area, context, get_self_for_render ());
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}
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void
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Rectangle::compute_bounding_box () const
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{
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if (!_rect.empty()) {
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Rect r = _rect.fix ();
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/* if the outline is 1 pixel, then the actual
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bounding box is 0.5 pixels outside the stated
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corners of the rectangle.
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if the outline is 2 pixels, then the actual
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bounding box is 1.0 pixels outside the stated
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corners of the rectangle (so that the middle
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of the 2 pixel wide border passes through
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the corners, alternatively described as 1 row
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of pixels outside of the corners, and 1 row
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inside).
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if the outline is 3 pixels, then the actual
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bounding box is 1.5 outside the stated corners
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of the rectangle (so that the middle row of
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pixels of the border passes through the corners).
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if the outline is 4 pixels, then the actual bounding
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box is 2.0 pixels outside the stated corners
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of the rectangle, so that the border consists
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of 2 pixels outside the corners and 2 pixels inside.
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hence ... the bounding box is width * 0.5 larger
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than the rectangle itself.
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*/
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_bounding_box = r.expand (1.0 + _outline_width * 0.5);
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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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Rectangle::set (Rect const & r)
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{
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/* We don't update the bounding box here; it's just
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as cheap to do it when asked.
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*/
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if (r != _rect) {
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begin_change ();
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_rect = r;
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_bounding_box_dirty = true;
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end_change ();
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}
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}
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void
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Rectangle::set_x0 (Coord x0)
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{
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if (x0 != _rect.x0) {
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begin_change ();
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_rect.x0 = x0;
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_bounding_box_dirty = true;
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end_change ();
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}
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}
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void
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Rectangle::set_y0 (Coord y0)
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{
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if (y0 != _rect.y0) {
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begin_change ();
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_rect.y0 = y0;
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_bounding_box_dirty = true;
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end_change();
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}
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}
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void
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Rectangle::set_x1 (Coord x1)
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{
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if (x1 != _rect.x1) {
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begin_change ();
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_rect.x1 = x1;
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_bounding_box_dirty = true;
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end_change ();
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}
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}
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void
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Rectangle::set_y1 (Coord y1)
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{
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if (y1 != _rect.y1) {
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begin_change ();
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_rect.y1 = y1;
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_bounding_box_dirty = true;
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end_change ();
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}
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}
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void
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Rectangle::set_outline_what (What what)
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{
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if (what != _outline_what) {
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begin_visual_change ();
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_outline_what = what;
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end_visual_change ();
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}
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}
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double
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Rectangle::vertical_fraction (double y) const
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{
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/* y is in canvas coordinates */
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Duple i (canvas_to_item (Duple (0, y)));
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Rect r = bounding_box();
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if (!r) {
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return 0; /* not really correct, but what else can we do? */
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}
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Rect bbox (r);
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if (i.y < bbox.y0 || i.y >= bbox.y1) {
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return 0;
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}
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/* convert to fit Cairo origin model (origin at upper left)
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*/
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return 1.0 - ((i.y - bbox.y0) / bbox.height());
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}
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