001: /*
002: * Licensed to the Apache Software Foundation (ASF) under one or more
003: * contributor license agreements. See the NOTICE file distributed with
004: * this work for additional information regarding copyright ownership.
005: * The ASF licenses this file to You under the Apache License, Version 2.0
006: * (the "License"); you may not use this file except in compliance with
007: * the License. You may obtain a copy of the License at
008: *
009: * http://www.apache.org/licenses/LICENSE-2.0
010: *
011: * Unless required by applicable law or agreed to in writing, software
012: * distributed under the License is distributed on an "AS IS" BASIS,
013: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014: * See the License for the specific language governing permissions and
015: * limitations under the License.
016: */
017:
018: /* $Id: FixedLength.java 279656 2005-09-08 22:06:48Z pietsch $ */
019:
020: package org.apache.fop.util;
021:
022: /**
023: * Utility class for unit conversions.
024: */
025: public final class UnitConv {
026:
027: /** conversion factory from millimeters to inches. */
028: public static final float IN2MM = 25.4f;
029:
030: /** conversion factory from centimeters to inches. */
031: public static final float IN2CM = 2.54f;
032:
033: /** conversion factory from inches to points. */
034: public static final int IN2PT = 72;
035:
036: /**
037: * Converts millimeters (mm) to points (pt)
038: * @param mm the value in mm
039: * @return the value in pt
040: */
041: public static double mm2pt(double mm) {
042: return mm * IN2PT / IN2MM;
043: }
044:
045: /**
046: * Converts millimeters (mm) to millipoints (mpt)
047: * @param mm the value in mm
048: * @return the value in mpt
049: */
050: public static double mm2mpt(double mm) {
051: return mm * 1000 * IN2PT / IN2MM;
052: }
053:
054: /**
055: * Converts points (pt) to millimeters (mm)
056: * @param pt the value in pt
057: * @return the value in mm
058: */
059: public static double pt2mm(double pt) {
060: return pt * IN2MM / IN2PT;
061: }
062:
063: /**
064: * Converts millimeters (mm) to inches (in)
065: * @param mm the value in mm
066: * @return the value in inches
067: */
068: public static double mm2in(double mm) {
069: return mm / IN2MM;
070: }
071:
072: /**
073: * Converts inches (in) to millimeters (mm)
074: * @param in the value in inches
075: * @return the value in mm
076: */
077: public static double in2mm(double in) {
078: return in * IN2MM;
079: }
080:
081: /**
082: * Converts inches (in) to millipoints (mpt)
083: * @param in the value in inches
084: * @return the value in mpt
085: */
086: public static double in2mpt(double in) {
087: return in * IN2PT * 1000;
088: }
089:
090: /**
091: * Converts millipoints (mpt) to inches (in)
092: * @param mpt the value in mpt
093: * @return the value in inches
094: */
095: public static double mpt2in(double mpt) {
096: return mpt / IN2PT / 1000;
097: }
098:
099: /**
100: * Converts millimeters (mm) to pixels (px)
101: * @param mm the value in mm
102: * @param resolution the resolution in dpi (dots per inch)
103: * @return the value in pixels
104: */
105: public static double mm2px(double mm, int resolution) {
106: return mm2in(mm) * resolution;
107: }
108:
109: /**
110: * Converts millipoints (mpt) to pixels (px)
111: * @param mpt the value in mpt
112: * @param resolution the resolution in dpi (dots per inch)
113: * @return the value in pixels
114: */
115: public static double mpt2px(double mpt, int resolution) {
116: return mpt2in(mpt) * resolution;
117: }
118:
119: }
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