Source Code Cross Referenced for PixelScale.java in  » GIS » GeoTools-2.4.1 » org » geotools » gce » geotiff » IIOMetadataAdpaters » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.gce.geotiff.IIOMetadataAdpaters 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    Geotools2 - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2006, Geotools Project Managment Committee (PMC)
005:         *
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation;
009:         *    version 2.1 of the License.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         *
016:         */
017:        package org.geotools.gce.geotiff.IIOMetadataAdpaters;
018:
019:        /**
020:         * This class is a placeholder for defining exact affine transformations between
021:         * raster and model space.
022:         * 
023:         * <p>
024:         * Quoting the geotiff spec:
025:         * 
026:         * <pre>
027:         *          ModelPixelScaleTag:
028:         *          Tag = 33550
029:         *          Type = DOUBLE (IEEE Double precision)
030:         *          N = 3
031:         *          Owner: SoftDesk
032:         * </pre>
033:         * 
034:         * This tag may be used to specify the size of raster pixel spacing in the model
035:         * space units, when the raster space can be embedded in the model space
036:         * coordinate system without rotation, and consists of the following 3 values:
037:         * 
038:         * <pre>
039:         *       ModelPixelScaleTag = (ScaleX, ScaleY, ScaleZ)
040:         * </pre>
041:         * 
042:         * where ScaleX and ScaleY give the horizontal and vertical spacing of raster
043:         * pixels. The ScaleZ is primarily used to map the pixel value of a digital
044:         * elevation model into the correct Z-scale, and so for most other purposes this
045:         * value should be zero (since most model spaces are 2-D, with Z=0).
046:         * 
047:         * <p>
048:         * A single tiepoint in the ModelTiepointTag, together with this tag, completely
049:         * determine the relationship between raster and model space
050:         * 
051:         * @author Simone Giannecchini
052:         * @since 2.3
053:         * 
054:         */
055:        public final class PixelScale {
056:
057:            private double scaleX;
058:
059:            private double scaleY;
060:
061:            private double scaleZ;
062:
063:            public PixelScale(double scaleX, double scaleY, double scaleZ) {
064:                this .scaleX = scaleX;
065:                this .scaleY = scaleY;
066:                this .scaleZ = scaleZ;
067:            }
068:
069:            public PixelScale() {
070:                this .scaleX = 0;
071:                this .scaleY = 0;
072:                this .scaleZ = 0;
073:            }
074:
075:            public double getScaleX() {
076:                return scaleX;
077:            }
078:
079:            public void setScaleX(double scaleX) {
080:                this .scaleX = scaleX;
081:            }
082:
083:            public double getScaleY() {
084:                return scaleY;
085:            }
086:
087:            public void setScaleY(double scaleY) {
088:                this .scaleY = scaleY;
089:            }
090:
091:            public double getScaleZ() {
092:                return scaleZ;
093:            }
094:
095:            public void setScaleZ(double scaleZ) {
096:                this .scaleZ = scaleZ;
097:            }
098:
099:            public double[] getValues() {
100:                return new double[] { scaleX, scaleY, scaleZ };
101:            }
102:
103:            public boolean isSet() {
104:                return isComponentSet(scaleX) && isComponentSet(scaleY);
105:            }
106:
107:            public boolean isSetExtended() {
108:                return isComponentSet(scaleX) && isComponentSet(scaleY)
109:                        && isComponentSet(scaleZ);
110:            }
111:
112:            /**
113:             * Tells me if a component of this {@link PixelScale} is set.
114:             * 
115:             * @param scale
116:             * @return
117:             */
118:            protected boolean isComponentSet(double scale) {
119:                return !Double.isInfinite(scale) && !Double.isNaN(scale)
120:                        && Math.abs(scale) > 1E-6;
121:            }
122:
123:        }
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