101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
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// Begin License:
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// Copyright (C) 2006-2008 Tobias Sargeant (tobias.sargeant@gmail.com).
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// All rights reserved.
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//
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// This file is part of the Carve CSG Library (http://carve-csg.com/)
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//
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// This file may be used under the terms of the GNU General Public
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// License version 2.0 as published by the Free Software Foundation
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// and appearing in the file LICENSE.GPL2 included in the packaging of
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// this file.
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//
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// This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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// INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE.
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// End:
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#pragma once
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#include <carve/carve.hpp>
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#include <carve/vector.hpp>
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#include <carve/aabb.hpp>
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#include <carve/matrix.hpp>
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#include <limits>
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namespace carve {
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namespace rescale {
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template<typename T>
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T calc_scale(T max) {
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const int radix = std::numeric_limits<T>::radix;
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T div = T(1);
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T m = fabs(max);
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while (div < m) div *= radix;
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m *= radix;
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while (div > m) div /= radix;
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return div;
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}
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template<typename T>
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T calc_delta(T min, T max) {
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const int radix = std::numeric_limits<T>::radix;
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if (min >= T(0) || max <= T(0)) {
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bool neg = false;
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if (max <= T(0)) {
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min = -min;
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max = -max;
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std::swap(min, max);
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neg = true;
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}
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T t = T(1);
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while (t > max) t /= radix;
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while (t <= max/radix) t *= radix;
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volatile T temp = t + min;
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temp -= t;
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if (neg) temp = -temp;
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return temp;
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} else {
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return T(0);
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}
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}
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struct rescale {
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double dx, dy, dz, scale;
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void init(double minx, double miny, double minz, double maxx, double maxy, double maxz) {
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dx = calc_delta(minx, maxx); minx -= dx; maxx -= dx;
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dy = calc_delta(miny, maxy); miny -= dy; maxy -= dy;
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dz = calc_delta(minz, maxz); minz -= dz; maxz -= dz;
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scale = calc_scale(std::max(std::max(fabs(minz), fabs(maxz)),
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std::max(std::max(fabs(minx), fabs(maxx)),
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std::max(fabs(miny), fabs(maxy)))));
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}
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rescale(double minx, double miny, double minz, double maxx, double maxy, double maxz) {
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init(minx, miny, minz, maxx, maxy, maxz);
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}
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rescale(const carve::geom3d::Vector &min, const carve::geom3d::Vector &max) {
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init(min.x, min.y, min.z, max.x, max.y, max.z);
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}
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};
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struct fwd {
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rescale r;
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fwd(const rescale &_r) : r(_r) { }
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carve::geom3d::Vector operator()(const carve::geom3d::Vector &v) const { return carve::geom::VECTOR((v.x - r.dx) / r.scale, (v.y - r.dy) / r.scale, (v.z - r.dz) / r.scale); }
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};
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struct rev {
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rescale r;
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rev(const rescale &_r) : r(_r) { }
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carve::geom3d::Vector operator()(const carve::geom3d::Vector &v) const { return carve::geom::VECTOR((v.x * r.scale) + r.dx, (v.y * r.scale) + r.dy, (v.z * r.scale) + r.dz); }
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};
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}
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}
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