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44
...o/github/albertus82/eqbulletin/gui/listener/FindEarthquakesSameAreaSelectionListener.java
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...ava/io/github/albertus82/eqbulletin/gui/listener/FindEventsSameAreaSelectionListener.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,86 @@ | ||
| package io.github.albertus82.eqbulletin.gui.listener; | ||
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| import java.util.function.Supplier; | ||
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| import org.eclipse.jface.viewers.TableViewer; | ||
| import org.eclipse.swt.SWT; | ||
| import org.eclipse.swt.events.SelectionAdapter; | ||
| import org.eclipse.swt.events.SelectionEvent; | ||
| import org.eclipse.swt.widgets.Table; | ||
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| import io.github.albertus82.eqbulletin.gui.ResultsTable; | ||
| import io.github.albertus82.eqbulletin.gui.SearchForm; | ||
| import io.github.albertus82.eqbulletin.model.Earthquake; | ||
| import io.github.albertus82.jface.maps.MapBounds; | ||
| import lombok.NonNull; | ||
| import lombok.RequiredArgsConstructor; | ||
| import lombok.extern.slf4j.Slf4j; | ||
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| @Slf4j | ||
| @RequiredArgsConstructor | ||
| public class FindEventsSameAreaSelectionListener extends SelectionAdapter { | ||
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| private static final double AUTHALIC_RADIUS = 6371.0072; | ||
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| @NonNull | ||
| private final Supplier<ResultsTable> resultsTableSupplier; | ||
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| @NonNull | ||
| private final Supplier<SearchForm> searchFormSupplier; | ||
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| @Override | ||
| public void widgetSelected(final SelectionEvent se) { | ||
| final TableViewer tableViewer = resultsTableSupplier.get().getTableViewer(); | ||
| final Earthquake selection = (Earthquake) tableViewer.getStructuredSelection().getFirstElement(); | ||
| final Table table = tableViewer.getTable(); | ||
| if (selection != null && table != null && !table.isDisposed()) { | ||
| final SearchForm form = searchFormSupplier.get(); | ||
| final float offset = 1; | ||
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| // Latitude (parallels) | ||
| final float lat = Math.min(MapBounds.LATITUDE_MAX_VALUE - offset, Math.max(MapBounds.LATITUDE_MIN_VALUE + offset, selection.getLatitude().getValue())); | ||
| final float lat0 = lat - offset; | ||
| final float lat1 = lat + offset; | ||
| form.setLatitudeFrom(lat0); | ||
| form.setLatitudeTo(lat1); | ||
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| // Longitude (meridians) | ||
| final float lon = selection.getLongitude().getValue(); | ||
| float lon0 = lon; | ||
| float lon1 = lon; | ||
| final double targetArea = computeArea(-1, 1, -1, 1); | ||
| double actualArea; | ||
| do { | ||
| final float step = 0.01f; | ||
| lon0 -= step; | ||
| lon1 += step; | ||
| actualArea = computeArea(lat0, lat1, lon0, lon1); | ||
| log.debug("lon0={}, lon1={} -> actualArea={}", lon0, lon1, actualArea); | ||
| } | ||
| while (actualArea < targetArea); | ||
| if (lon0 < -180) { | ||
| lon0 += 360; | ||
| } | ||
| if (lon1 > 180) { | ||
| lon1 -= 360; | ||
| } | ||
| log.debug("lon0={}, lon1={}", lon0, lon1); | ||
| form.setLongitudeFrom(lon0); | ||
| form.setLongitudeTo(lon1); | ||
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| form.getSearchButton().notifyListeners(SWT.Selection, null); | ||
| } | ||
| } | ||
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| private static double computeArea(final double lat0deg, final double lat1deg, final double lon0deg, final double lon1deg) { | ||
| final double lat0rad = Math.toRadians(lat0deg); | ||
| final double lat1rad = Math.toRadians(lat1deg); | ||
| final double lon0rad = Math.toRadians(lon0deg); | ||
| final double lon1rad = Math.toRadians(lon1deg); | ||
| final double a = Math.sin(lat1rad) - Math.sin(lat0rad); | ||
| final double b = lon1rad - lon0rad; | ||
| final double c = Math.pow(AUTHALIC_RADIUS, 2); | ||
| return a * b * c; | ||
| } | ||
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| } |