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Diffstat (limited to 'libs/canvas/types.cc')
| -rw-r--r-- | libs/canvas/types.cc | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/libs/canvas/types.cc b/libs/canvas/types.cc new file mode 100644 index 0000000000..a8c690bbbe --- /dev/null +++ b/libs/canvas/types.cc @@ -0,0 +1,200 @@ +/* + 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 <cfloat> +#include <cassert> + +#include <cairomm/context.h> + +#include "canvas/types.h" + +using namespace std; +using namespace ArdourCanvas; + +Coord const ArdourCanvas::COORD_MAX = 1.7e307; + +static inline Coord +safe_add (Coord a, Coord b) +{ + if (((COORD_MAX - a) <= b) || ((COORD_MAX - b) <= a)) { + return COORD_MAX; + } + + return a + b; +} + +Duple +Duple::translate (Duple t) const +{ + Duple d; + + d.x = safe_add (x, t.x); + d.y = safe_add (y, t.y); + + return d; +} + +boost::optional<Rect> +Rect::intersection (Rect const & o) const +{ + Rect i; + + i.x0 = max (x0, o.x0); + i.y0 = max (y0, o.y0); + i.x1 = min (x1, o.x1); + i.y1 = min (y1, o.y1); + + if (i.x0 > i.x1 || i.y0 > i.y1) { + return boost::optional<Rect> (); + } + + return boost::optional<Rect> (i); +} + +Rect +Rect::translate (Duple t) const +{ + Rect r; + + r.x0 = safe_add (x0, t.x); + r.y0 = safe_add (y0, t.y); + r.x1 = safe_add (x1, t.x); + r.y1 = safe_add (y1, t.y); + return r; +} + +Rect +Rect::extend (Rect const & o) const +{ + Rect r; + r.x0 = min (x0, o.x0); + r.y0 = min (y0, o.y0); + r.x1 = max (x1, o.x1); + r.y1 = max (y1, o.y1); + return r; +} + +Rect +Rect::expand (Distance amount) const +{ + Rect r; + r.x0 = x0 - amount; + r.y0 = y0 - amount; + r.x1 = safe_add (x1, amount); + r.y1 = safe_add (y1, amount); + return r; +} + +bool +Rect::contains (Duple point) const +{ + return point.x >= x0 && point.x <= x1 && point.y >= y0 && point.y <= y1; +} + +Rect +Rect::fix () const +{ + Rect r; + + r.x0 = min (x0, x1); + r.y0 = min (y0, y1); + r.x1 = max (x0, x1); + r.y1 = max (y0, y1); + + return r; +} + +Rect +Rect::convert_to_device (Cairo::RefPtr<Cairo::Context> c) const +{ + Coord xa, ya, xb, yb; + + xa = x0; + xb = x1; + ya = y0; + yb = y1; + + c->user_to_device (xa, ya); + c->user_to_device (xb, yb); + + return Rect (xa, ya, xb, yb); +} + + +Rect +Rect::convert_to_user (Cairo::RefPtr<Cairo::Context> c) const +{ + Coord xa, ya, xb, yb; + + xa = x0; + xb = x1; + ya = y0; + yb = y1; + + c->device_to_user (xa, ya); + c->device_to_user (xb, yb); + + return Rect (xa, ya, xb, yb); +} + +Duple +ArdourCanvas::operator- (Duple const & o) +{ + return Duple (-o.x, -o.y); +} + +Duple +ArdourCanvas::operator+ (Duple const & a, Duple const & b) +{ + return Duple (safe_add (a.x, b.x), safe_add (a.y, b.y)); +} + +bool +ArdourCanvas::operator== (Duple const & a, Duple const & b) +{ + return a.x == b.x && a.y == b.y; +} + +Duple +ArdourCanvas::operator- (Duple const & a, Duple const & b) +{ + return Duple (a.x - b.x, a.y - b.y); +} + +Duple +ArdourCanvas::operator/ (Duple const & a, double b) +{ + return Duple (a.x / b, a.y / b); +} + +ostream & +ArdourCanvas::operator<< (ostream & s, Duple const & r) +{ + s << "(" << r.x << ", " << r.y << ")"; + return s; +} + +ostream & +ArdourCanvas::operator<< (ostream & s, Rect const & r) +{ + s << "[(" << r.x0 << ", " << r.y0 << "), (" << r.x1 << ", " << r.y1 << ") " << r.width() << " x " << r.height() << "]"; + return s; +} + |