象素厘米转换

读好代码就像读一遍伟大的小说，写出伟大的小说也是从读其它伟大的小说开始

/*********************************************************************
*
* Copyright (C) 2006 Andrew Khan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***************************************************************************/

package common;

public class LengthConverter
{
private static double[][] factors =
new double[LengthUnit.getCount()][LengthUnit.getCount()];

static
{
// The identity factors
factors[LengthUnit.POINTS.getIndex()][LengthUnit.POINTS.getIndex()] = 1;
factors[LengthUnit.METRES.getIndex()][LengthUnit.METRES.getIndex()] = 1;
factors[LengthUnit.CENTIMETRES.getIndex()][LengthUnit.CENTIMETRES.getIndex()] = 1;
factors[LengthUnit.INCHES.getIndex()][LengthUnit.INCHES.getIndex()] = 1;

// The points conversion factors
factors[LengthUnit.POINTS.getIndex()][LengthUnit.METRES.getIndex()] = 0.00035277777778;
factors[LengthUnit.POINTS.getIndex()][LengthUnit.CENTIMETRES.getIndex()] = 0.035277777778;
factors[LengthUnit.POINTS.getIndex()][LengthUnit.INCHES.getIndex()] = 0.013888888889;

// The metres conversion factors
factors[LengthUnit.METRES.getIndex()][LengthUnit.POINTS.getIndex()] = 2877.84;
factors[LengthUnit.METRES.getIndex()][LengthUnit.CENTIMETRES.getIndex()] = 100;
factors[LengthUnit.METRES.getIndex()][LengthUnit.INCHES.getIndex()] = 39.37;

// The centimetres conversion factors
factors[LengthUnit.CENTIMETRES.getIndex()][LengthUnit.POINTS.getIndex()] = 28.34643;
factors[LengthUnit.CENTIMETRES.getIndex()][LengthUnit.METRES.getIndex()] = 0.01;
factors[LengthUnit.CENTIMETRES.getIndex()][LengthUnit.INCHES.getIndex()] = 0.3937;

// The inches conversion factors
factors[LengthUnit.INCHES.getIndex()][LengthUnit.POINTS.getIndex()] = 72;
factors[LengthUnit.INCHES.getIndex()][LengthUnit.METRES.getIndex()] = 0.0254;
factors[LengthUnit.INCHES.getIndex()][LengthUnit.CENTIMETRES.getIndex()] = 2.54;
}

public static double getConversionFactor(LengthUnit from, LengthUnit to)
{
return factors[from.getIndex()][to.getIndex()];
}
}