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Diffstat (limited to 'Build/source/texk/lcdf-typetools/lcdf-typetools-2.98/liblcdf/transform.cc')
-rw-r--r-- | Build/source/texk/lcdf-typetools/lcdf-typetools-2.98/liblcdf/transform.cc | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/Build/source/texk/lcdf-typetools/lcdf-typetools-2.98/liblcdf/transform.cc b/Build/source/texk/lcdf-typetools/lcdf-typetools-2.98/liblcdf/transform.cc new file mode 100644 index 00000000000..5eb0ff58728 --- /dev/null +++ b/Build/source/texk/lcdf-typetools/lcdf-typetools-2.98/liblcdf/transform.cc @@ -0,0 +1,167 @@ +// -*- related-file-name: "../include/lcdf/transform.hh" -*- + +/* transform.{cc,hh} -- planar affine transformations + * + * Copyright (c) 2000-2012 Eddie Kohler + * + * 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. + */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif +#include <lcdf/transform.hh> +#include <lcdf/straccum.hh> +#include <math.h> + +Transform::Transform() +{ + _m[0] = _m[3] = 1; + _m[1] = _m[2] = _m[4] = _m[5] = 0; + _null = true; +} + +Transform::Transform(const double m[6]) +{ + _m[0] = m[0]; + _m[1] = m[1]; + _m[2] = m[2]; + _m[3] = m[3]; + _m[4] = m[4]; + _m[5] = m[5]; + check_null(0); +} + +Transform::Transform(double m0, double m1, double m2, + double m3, double m4, double m5) +{ + _m[0] = m0; + _m[1] = m1; + _m[2] = m2; + _m[3] = m3; + _m[4] = m4; + _m[5] = m5; + check_null(0); +} + +void +Transform::check_null(double tolerance) +{ + _null = (fabs(_m[0] - 1) < tolerance && fabs(_m[1]) < tolerance + && fabs(_m[2]) < tolerance && fabs(_m[3] - 1) < tolerance + && fabs(_m[4]) < tolerance && fabs(_m[5]) < tolerance); +} + + +void +Transform::scale(double x, double y) +{ + _m[0] *= x; + _m[1] *= x; + _m[2] *= y; + _m[3] *= y; + + if (x != 1 || y != 1) + _null = false; +} + +void +Transform::rotate(double r) +{ + double c = cos(r); + double s = sin(r); + + double a = _m[0], b = _m[2]; + _m[0] = a*c + b*s; + _m[2] = b*c - a*s; + + a = _m[1], b = _m[3]; + _m[1] = a*c + b*s; + _m[3] = b*c - a*s; + + if (r != 0) + _null = false; +} + +void +Transform::translate(double x, double y) +{ + _m[4] += _m[0]*x + _m[2]*y; + _m[5] += _m[1]*x + _m[3]*y; + + if (x != 0 || y != 0) + _null = false; +} + +void +Transform::shear(double s) +{ + *this *= Transform(1, 0, s, 1, 0, 0); +} + +Transform +Transform::transformed(const Transform &t) const +{ + return Transform(_m[0] * t._m[0] + _m[2] * t._m[1], + _m[1] * t._m[0] + _m[3] * t._m[1], + _m[0] * t._m[2] + _m[2] * t._m[3], + _m[1] * t._m[2] + _m[3] * t._m[3], + _m[0] * t._m[4] + _m[2] * t._m[5] + _m[4], + _m[1] * t._m[4] + _m[3] * t._m[5] + _m[5]); +} + + +void +Transform::real_apply_to(Point &p) const +{ + double x = p.x; + p.x = x*_m[0] + p.y*_m[2] + _m[4]; + p.y = x*_m[1] + p.y*_m[3] + _m[5]; +} + +Point +Transform::real_apply(const Point &p) const +{ + return Point(p.x*_m[0] + p.y*_m[2] + _m[4], + p.x*_m[1] + p.y*_m[3] + _m[5]); +} + +Bezier & +operator*=(Bezier &b, const Transform &t) +{ + if (!t.null()) { + b.mpoint(0) *= t; + b.mpoint(1) *= t; + b.mpoint(2) *= t; + b.mpoint(3) *= t; + } + return b; +} + +Bezier +operator*(const Bezier &b, const Transform &t) +{ + return (t.null() + ? b + : Bezier(b.point(0) * t, b.point(1) * t, b.point(2) * t, b.point(3) * t)); +} + +String +Transform::unparse() const +{ + StringAccum sa; + sa << '['; + for (int i = 0; i < 6; i++) { + if (i) + sa << ',' << ' '; + sa << _m[i]; + } + sa << ']'; + return sa.take_string(); +} |