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Last change
on this file since 51 was 51, checked in by imi, 18 years ago |
- fixed server rounding problem
- fixed bug, that save with filter does not add extension
- fixed modified flag for data from server vs. data from disk
- hacked "ConcurrentModifyException" (need to do this better)
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File size:
830 bytes
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| 1 | package org.openstreetmap.josm.data.projection;
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| 2 |
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| 3 | import org.openstreetmap.josm.data.GeoPoint;
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| 4 |
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| 5 | /**
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| 6 | * Implement Mercator Projection code, coded after documentation
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| 7 | * from wikipedia.
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| 8 | *
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| 9 | * The center of the mercator projection is always the 0 grad
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| 10 | * coordinate.
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| 11 | *
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| 12 | * @author imi
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| 13 | */
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| 14 | public class Mercator implements Projection {
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| 15 |
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| 16 | public void latlon2xy(GeoPoint p) {
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| 17 | p.x = p.lon*Math.PI/180;
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| 18 | p.y = Math.log(Math.tan(Math.PI/4+p.lat*Math.PI/360));
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| 19 | }
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| 20 |
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| 21 | public void xy2latlon(GeoPoint p) {
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| 22 | p.lon = p.x*180/Math.PI;
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| 23 | p.lat = Math.atan(Math.sinh(p.y))*180/Math.PI;
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| 24 | // round values to maximum server precision
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| 25 | p.lon = Math.round(p.lon*MAX_SERVER_PRECISION)/MAX_SERVER_PRECISION;
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| 26 | p.lat = Math.round(p.lat*MAX_SERVER_PRECISION)/MAX_SERVER_PRECISION;
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| 27 | }
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| 28 |
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| 29 | @Override
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| 30 | public String toString() {
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| 31 | return "Mercator";
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| 32 | }
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| 33 | }
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