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/*************************************************************************
** PageSize.cpp **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2013 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;
}
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