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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/PageSize.cpp')
| -rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/PageSize.cpp | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/PageSize.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/PageSize.cpp new file mode 100644 index 00000000000..9b5e6b29b40 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.1/src/PageSize.cpp @@ -0,0 +1,156 @@ +/************************************************************************* +** PageSize.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2010 Martin Gieseking <martin.gieseking@uos.de> ** +** ** +** 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 3 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, see <http://www.gnu.org/licenses/>. ** +*************************************************************************/ + +#include <algorithm> +#include <cctype> +#include <cmath> +#include <sstream> +#include "PageSize.h" + +using namespace std; + +// make sure tolower is a function (and not a macro) +// so that 'transform' can be applied +static int my_tolower (int c) { + return tolower(c); +} + + +/** Computes width and height of ISO/DIN An in millimeters. + * @param[in] n the A level (e.g. n=4 => DIN A4) + * @param[out] width contains the page width when function returns + * @param[out] height contains the page height when function returns */ +static void computeASize (int n, double &width, double &height) { + double sqrt2 = sqrt(2.0); + height = floor(1189.0/pow(sqrt2, n)+0.5); + width = floor(height/sqrt2+0.5); +} + + +/** Computes width and height of ISO/DIN Bn in millimeters. + * @param[in] n the B level (e.g. n=4 => DIN B4) + * @param[out] width contains the page width when function returns + * @param[out] height contains the page height when function returns */ +static void computeBSize (int n, double &width, double &height) { + double w, h; + computeASize(n, width, height); + computeASize(n-1, w, h); + width = floor(sqrt(width * w)+0.5); + height = floor(sqrt(height * h)+0.5); +} + + +/** Computes width and height of ISO/DIN Cn in millimeters. + * @param[in] n the C level (e.g. n=4 => DIN C4) + * @param[out] width contains the page width when function returns + * @param[out] height contains the page height when function returns */ +static void computeCSize (int n, double &width, double &height) { + double w, h; + computeASize(n, width, height); + computeBSize(n, w, h); + width = floor(sqrt(width * w)+0.5); + height = floor(sqrt(height * h)+0.5); +} + + +/** Computes width and height of ISO/DIN Dn in millimeters. + * @param[in] n the D level (e.g. n=4 => DIN D4) + * @param[out] width contains the page width when function returns + * @param[out] height contains the page height when function returns */ +static void computeDSize (int n, double &width, double &height) { + double w, h; + computeASize(n, width, height); + computeBSize(n+1, w, h); + width = floor(sqrt(width * w)+0.5); + height = floor(sqrt(height * h)+0.5); +} + + +/** Constructs a PageSize object of given size. + * @param[in] name specifies the page size, e.g. "A4" or "letter" */ +PageSize::PageSize (string name) : width(0), height(0) { + resize(name); +} + + +void PageSize::resize (double w, double h) { + width = w; + height = h; +} + +void PageSize::resize (string name) { + if (name.length() < 2) + throw PageSizeException("unknown page format: "+name); + + transform(name.begin(), name.end(), name.begin(), my_tolower); + // extract optional suffix + size_t pos = name.rfind("-"); + bool landscape = false; + if (pos != string::npos) { + string suffix = name.substr(pos); + name = name.substr(0, pos); + if (suffix == "-l" || suffix == "-landscape") + landscape = true; + else if (suffix != "-p" && suffix != "-portrait") + throw PageSizeException("invalid page format suffix: " + suffix); + } + + if (name == "invoice") { + width = 140; + height = 216; + } + else if (name == "executive") { + width = 184; + height = 267; + } + else if (name == "legal") { + width = 216; + height = 356; + } + else if (name == "letter") { + width = 216; + height = 279; + } + else if (name == "ledger") { + width = 279; + height = 432; + } + else if (isdigit(name[1]) && name.length() < 5) { // limit length of number to prevent arithmetic errors + istringstream iss(name.substr(1)); + int n; + iss >> n; + switch (name[0]) { + case 'a' : computeASize(n, width, height); break; + case 'b' : computeBSize(n, width, height); break; + case 'c' : computeCSize(n, width, height); break; + case 'd' : computeDSize(n, width, height); break; + default : throw PageSizeException("invalid page format: "+name); + } + } + if (width == 0 || height == 0) + throw PageSizeException("unknown page format: "+name); + if (landscape) + swap(width, height); + + const double ptpmm = 72.27/25.4; // TeX points per millimeter (72.27pt = 1in = 25.4mm) + width *= ptpmm; + height *= ptpmm; +} + |