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109 lines
3.3 KiB
Java
109 lines
3.3 KiB
Java
package zext.plantuml.com.ctreber.acearth;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.StringTokenizer;
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import zext.plantuml.com.ctreber.acearth.util.Point3D;
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import zext.plantuml.com.ctreber.acearth.util.Polygon;
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/**
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* The map data file is a big array of short (16-bit) ints, as follows: - it is
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* a sequence of closed curves - the first value in a curve is the number of
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* points in the curve - the second value in a curve indicates land/water (1 or
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* -1, respectively) - this is followed by an [x,y,z] triple that indicates a
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* point on the unit sphere (each of x, y, and z has been scaled by 30000),
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* where the x axis points "to the right" (towards 0 N 90 E), the y axis points
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* "up" (towards the north pole), and the z axis points "out of the screen"
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* (towards 0 N 0 E). this is the starting point of the curve. - this is
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* followed by (one less than the number of points in the curve) triples
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* [dx,dy,dz]; the [x,y,z] triple for each successive point in the curve is
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* obtained by adding [dx,dy,dz] onto the previous [x,y,z] values. - the curves
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* are [must be!] non-self-intersecting and traced in a counter-clockwise
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* direction
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*
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* the curves are sampled at a (roughly) a 20 mile resolution.
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*
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* <p>
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* © 2002 Christian Treber, ct@ctreber.com
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*
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* @author Christian Treber, ct@ctreber.com
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*
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*/
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public class MapDataReader {
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/** Point value scale (devide value by this number). */
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private static final double MAP_DATA_SCALE = 30000.0;
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private static List fData;
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private static List fPolygons;
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private static int fIndex;
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/**
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* <p>
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* Read map data.
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*
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* @return Array of map polygons.
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* @throws IOException
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*/
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public static Polygon[] readMapData() throws IOException {
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final List lines = new MapData().getLines();
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fData = new ArrayList();
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for (Iterator it = lines.iterator(); it.hasNext(); ) {
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String lLine = (String) it.next();
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if (lLine.contains("/*")) {
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// Filter out comments.
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continue;
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}
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StringTokenizer lST = new StringTokenizer(lLine, ", ");
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while (lST.hasMoreTokens()) {
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String lToken = lST.nextToken();
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final Integer lValue = Integer.valueOf(lToken);
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fData.add(lValue);
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}
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}
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fPolygons = new ArrayList();
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fIndex = 0;
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while (getValue(fIndex) != 0) {
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processCurve();
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}
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return (Polygon[]) fPolygons.toArray(new Polygon[0]);
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}
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private static void processCurve() {
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final int lNPoint = getValue(fIndex++);
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final int lType = getValue(fIndex++);
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final Point3D[] lPoints = new Point3D[lNPoint];
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final Point3D lPoint3D = new Point3D(getValue(fIndex++) / MAP_DATA_SCALE, getValue(fIndex++) / MAP_DATA_SCALE,
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getValue(fIndex++) / MAP_DATA_SCALE);
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lPoints[0] = lPoint3D;
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for (int i = 1; i < lNPoint; i++) {
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lPoints[i] = new Point3D(lPoints[i - 1].getX() + getValue(fIndex++) / MAP_DATA_SCALE, lPoints[i - 1].getY()
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+ getValue(fIndex++) / MAP_DATA_SCALE, lPoints[i - 1].getZ() + getValue(fIndex++) / MAP_DATA_SCALE);
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}
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final Polygon lPolygon = new Polygon(lType, lPoints);
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fPolygons.add(lPolygon);
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}
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/**
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* <p>
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* Get value of raw data at specified point.
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*
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* @param pIndex
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* Index of value.
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* @return Value of raw data at specified point.
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*/
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private static int getValue(int pIndex) {
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return ((Integer) fData.get(pIndex)).intValue();
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}
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}
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