rect.cpp revision 76addc201c409e81eaaa73fe27cc0f79c4db097c
/* Axis-aligned rectangle
*
* Authors:
* Michael Sloan <mgsloan@gmail.com>
* Krzysztof Kosiński <tweenk.pl@gmail.com>
* Copyright 2007-2011 Authors
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*/
#include <2geom/rect.h>
namespace Geom {
/** @brief Transform the rectangle by an affine.
* The result of the transformation might not be axis-aligned. The return value
* of this operation will be the smallest axis-aligned rectangle containing
* all points of the true result. */
Rect &Rect::operator*=(Affine const &m) {
Point pts[4];
for (unsigned i=0; i<4; ++i) pts[i] = corner(i) * m;
Coord minx = std::min(std::min(pts[0][X], pts[1][X]), std::min(pts[2][X], pts[3][X]));
Coord miny = std::min(std::min(pts[0][Y], pts[1][Y]), std::min(pts[2][Y], pts[3][Y]));
Coord maxx = std::max(std::max(pts[0][X], pts[1][X]), std::max(pts[2][X], pts[3][X]));
Coord maxy = std::max(std::max(pts[0][Y], pts[1][Y]), std::max(pts[2][Y], pts[3][Y]));
f[X].setMin(minx); f[X].setMax(maxx);
f[Y].setMin(miny); f[Y].setMax(maxy);
return *this;
}
Coord distanceSq(Point const &p, Rect const &rect)
{
double dx = 0, dy = 0;
if ( p[X] < rect.left() ) {
dx = p[X] - rect.left();
} else if ( p[X] > rect.right() ) {
dx = rect.right() - p[X];
}
if (p[Y] < rect.top() ) {
dy = rect.top() - p[Y];
} else if ( p[Y] > rect.bottom() ) {
dy = p[Y] - rect.bottom();
}
return dx*dx+dy*dy;
}
/** @brief Returns the smallest distance between p and rect.
* @relates Rect */
Coord distance(Point const &p, Rect const &rect)
{
// copy of distanceSq, because we need to use hypot()
double dx = 0, dy = 0;
if ( p[X] < rect.left() ) {
dx = p[X] - rect.left();
} else if ( p[X] > rect.right() ) {
dx = rect.right() - p[X];
}
if (p[Y] < rect.top() ) {
dy = rect.top() - p[Y];
} else if ( p[Y] > rect.bottom() ) {
dy = p[Y] - rect.bottom();
}
return hypot(dx, dy);
}
Coord distanceSq(Point const &p, OptRect const &rect)
{
if (!rect) return std::numeric_limits<Coord>::max();
return distanceSq(p, *rect);
}
Coord distance(Point const &p, OptRect const &rect)
{
if (!rect) return std::numeric_limits<Coord>::max();
return distance(p, *rect);
}
} // namespace Geom
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :