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Diffstat (limited to 'src/2geom/rect.cpp')
| -rw-r--r-- | src/2geom/rect.cpp | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/2geom/rect.cpp b/src/2geom/rect.cpp new file mode 100644 index 0000000..60dcc87 --- /dev/null +++ b/src/2geom/rect.cpp @@ -0,0 +1,187 @@ +/* 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> +#include <2geom/transforms.h> + +namespace Geom { + +Point align_factors(Align g) { + Point p; + switch (g) { + case ALIGN_XMIN_YMIN: + p[X] = 0.0; + p[Y] = 0.0; + break; + case ALIGN_XMID_YMIN: + p[X] = 0.5; + p[Y] = 0.0; + break; + case ALIGN_XMAX_YMIN: + p[X] = 1.0; + p[Y] = 0.0; + break; + case ALIGN_XMIN_YMID: + p[X] = 0.0; + p[Y] = 0.5; + break; + case ALIGN_XMID_YMID: + p[X] = 0.5; + p[Y] = 0.5; + break; + case ALIGN_XMAX_YMID: + p[X] = 1.0; + p[Y] = 0.5; + break; + case ALIGN_XMIN_YMAX: + p[X] = 0.0; + p[Y] = 1.0; + break; + case ALIGN_XMID_YMAX: + p[X] = 0.5; + p[Y] = 1.0; + break; + case ALIGN_XMAX_YMAX: + p[X] = 1.0; + p[Y] = 1.0; + break; + default: + break; + } + return p; +} + + +/** @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; +} + +Affine Rect::transformTo(Rect const &viewport, Aspect const &aspect) const +{ + // 1. translate viewbox to origin + Geom::Affine total = Translate(-min()); + + // 2. compute scale + Geom::Point vdims = viewport.dimensions(); + Geom::Point dims = dimensions(); + Geom::Scale scale(vdims[X] / dims[X], vdims[Y] / dims[Y]); + + if (aspect.align == ALIGN_NONE) { + // apply non-uniform scale + total *= scale * Translate(viewport.min()); + } else { + double uscale = 0; + if (aspect.expansion == EXPANSION_MEET) { + uscale = std::min(scale[X], scale[Y]); + } else { + uscale = std::max(scale[X], scale[Y]); + } + scale = Scale(uscale); + + // compute offset for align + Geom::Point offset = vdims - dims * scale; + offset *= Scale(align_factors(aspect.align)); + total *= scale * Translate(viewport.min() + offset); + } + + return total; +} + +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:fileencoding=utf-8:textwidth=99 : |