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