202 lines
3.6 KiB
C++
202 lines
3.6 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 <algorithm>
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#include <cfloat>
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#include <cassert>
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#include <cairomm/context.h>
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#include "canvas/types.h"
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using namespace std;
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using namespace ArdourCanvas;
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Coord const ArdourCanvas::COORD_MAX = 1.7e307;
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static inline Coord
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safe_add (Coord a, Coord b)
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{
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if (((COORD_MAX - a) <= b) || ((COORD_MAX - b) <= a)) {
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return COORD_MAX;
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}
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return a + b;
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}
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Duple
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Duple::translate (Duple t) const
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{
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Duple d;
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d.x = safe_add (x, t.x);
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d.y = safe_add (y, t.y);
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return d;
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}
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boost::optional<Rect>
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Rect::intersection (Rect const & o) const
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{
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Rect i;
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i.x0 = max (x0, o.x0);
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i.y0 = max (y0, o.y0);
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i.x1 = min (x1, o.x1);
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i.y1 = min (y1, o.y1);
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if (i.x0 > i.x1 || i.y0 > i.y1) {
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return boost::optional<Rect> ();
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}
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return boost::optional<Rect> (i);
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}
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Rect
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Rect::translate (Duple t) const
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{
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Rect r;
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r.x0 = safe_add (x0, t.x);
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r.y0 = safe_add (y0, t.y);
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r.x1 = safe_add (x1, t.x);
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r.y1 = safe_add (y1, t.y);
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return r;
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}
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Rect
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Rect::extend (Rect const & o) const
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{
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Rect r;
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r.x0 = min (x0, o.x0);
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r.y0 = min (y0, o.y0);
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r.x1 = max (x1, o.x1);
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r.y1 = max (y1, o.y1);
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return r;
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}
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Rect
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Rect::expand (Distance amount) const
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{
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Rect r;
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r.x0 = x0 - amount;
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r.y0 = y0 - amount;
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r.x1 = safe_add (x1, amount);
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r.y1 = safe_add (y1, amount);
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return r;
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}
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Rect
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Rect::shrink (Distance amount) const
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{
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/* This isn't the equivalent of expand (-distance) because
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of the peculiarities of safe_add() with negative values.
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Maybe.
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*/
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Rect r;
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r.x0 = safe_add (x0, amount);
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r.y0 = safe_add (y0, amount);
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r.x1 = x1 - amount;
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r.y1 = y1 - amount;
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return r;
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}
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bool
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Rect::contains (Duple point) const
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{
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return point.x >= x0 && point.x <= x1 && point.y >= y0 && point.y <= y1;
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}
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Rect
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Rect::fix () const
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{
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Rect r;
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r.x0 = min (x0, x1);
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r.y0 = min (y0, y1);
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r.x1 = max (x0, x1);
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r.y1 = max (y0, y1);
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return r;
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}
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bool
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ArdourCanvas::operator!= (Rect const& a, Rect const& b)
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{
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return a.x0 != b.x0 ||
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a.x1 != b.x1 ||
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a.y0 != b.y0 ||
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a.y1 != b.y1;
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}
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Duple
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ArdourCanvas::operator- (Duple const & o)
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{
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return Duple (-o.x, -o.y);
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}
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Duple
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ArdourCanvas::operator+ (Duple const & a, Duple const & b)
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{
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return Duple (safe_add (a.x, b.x), safe_add (a.y, b.y));
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}
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bool
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ArdourCanvas::operator== (Duple const & a, Duple const & b)
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{
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return a.x == b.x && a.y == b.y;
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}
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bool
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ArdourCanvas::operator!= (Duple const & a, Duple const & b)
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{
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return a.x != b.x || a.y != b.y;
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}
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Duple
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ArdourCanvas::operator- (Duple const & a, Duple const & b)
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{
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return Duple (a.x - b.x, a.y - b.y);
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}
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Duple
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ArdourCanvas::operator/ (Duple const & a, double b)
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{
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return Duple (a.x / b, a.y / b);
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}
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ostream &
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ArdourCanvas::operator<< (ostream & s, Duple const & r)
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{
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s << "(" << r.x << ", " << r.y << ")";
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return s;
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}
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ostream &
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ArdourCanvas::operator<< (ostream & s, Rect const & r)
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{
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s << "[(" << r.x0 << ", " << r.y0 << "), (" << r.x1 << ", " << r.y1 << ") " << r.width() << " x " << r.height() << "]";
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return s;
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}
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