org.kalypso.gml.ui.internal.coverage.CoverageColorRangeAction.java Source code

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Here is the source code for org.kalypso.gml.ui.internal.coverage.CoverageColorRangeAction.java

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/*----------------    FILE HEADER KALYPSO ------------------------------------------
 *
 *  This file is part of kalypso.
 *  Copyright (C) 2004 by:
 *
 *  Technical University Hamburg-Harburg (TUHH)
 *  Institute of River and coastal engineering
 *  Denickestrae 22
 *  21073 Hamburg, Germany
 *  http://www.tuhh.de/wb
 *
 *  and
 *
 *  Bjoernsen Consulting Engineers (BCE)
 *  Maria Trost 3
 *  56070 Koblenz, Germany
 *  http://www.bjoernsen.de
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact:
 *
 *  E-Mail:
 *  belger@bjoernsen.de
 *  schlienger@bjoernsen.de
 *  v.doemming@tuhh.de
 *
 *  ---------------------------------------------------------------------------*/
package org.kalypso.gml.ui.internal.coverage;

import java.math.BigDecimal;
import java.util.Collection;
import java.util.SortedMap;

import org.apache.commons.lang3.Range;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.widgets.Event;
import org.kalypso.contribs.eclipse.jface.wizard.IUpdateable;
import org.kalypso.gml.ui.KalypsoGmlUIPlugin;
import org.kalypso.gml.ui.KalypsoGmlUiImages;
import org.kalypso.gml.ui.coverage.CoverageManagementWidget;
import org.kalypso.gml.ui.i18n.Messages;
import org.kalypso.ogc.gml.IKalypsoFeatureTheme;
import org.kalypsodeegree.graphics.sld.ColorMapEntry;
import org.kalypsodeegree.graphics.sld.RasterSymbolizer;
import org.kalypsodeegree.model.elevation.ElevationUtilities;
import org.kalypsodeegree_impl.gml.binding.commons.ICoverage;

/**
 * @author Gernot Belger
 */
public class CoverageColorRangeAction extends Action implements IUpdateable {
    private final CoverageManagementWidget m_widget;

    public CoverageColorRangeAction(final CoverageManagementWidget widget) {
        m_widget = widget;

        setText(Messages.getString("org.kalypso.gml.ui.map.CoverageManagementWidget.4")); //$NON-NLS-1$
        setImageDescriptor(KalypsoGmlUIPlugin.getImageProvider()
                .getImageDescriptor(KalypsoGmlUiImages.DESCRIPTORS.STYLE_EDIT));
    }

    @Override
    public void runWithEvent(final Event event) {
        final IKalypsoFeatureTheme selectedTheme = m_widget.getSelectedTheme();
        final ICoverage[] coverages = m_widget.getCoverages();
        if (selectedTheme == null || coverages == null) {
            // no message, should not happen because action is disabled in this case
            return;
        }

        final IKalypsoFeatureTheme[] allCoverageThemes = m_widget.findThemesForCombo();

        final CoverageColormapHandler colormapHandler = new CoverageColormapHandler(selectedTheme,
                allCoverageThemes);

        final RasterSymbolizer symb = colormapHandler.getRasterSymbolizer();
        if (symb == null) {
            MessageDialog.openWarning(event.display.getActiveShell(),
                    Messages.getString("org.kalypso.gml.ui.map.CoverageManagementWidget.4"), //$NON-NLS-1$
                    Messages.getString("org.kalypso.gml.ui.map.CoverageManagementWidget.6")); //$NON-NLS-1$
            return;
        }

        final SortedMap<Double, ColorMapEntry> input = symb.getColorMap();

        if (input == null)
            return;

        // convert map into an array
        final Collection<ColorMapEntry> values = input.values();
        final ColorMapEntry[] entries = values.toArray(new ColorMapEntry[values.size()]);

        final Range<Double> minMax = ElevationUtilities.calculateRange(coverages);

        final BigDecimal min = asBigDecimal(minMax.getMinimum());
        final BigDecimal max = asBigDecimal(minMax.getMaximum());

        // open dialog
        final GridStyleDialog dialog = new GridStyleDialog(event.display.getActiveShell(), entries, min, max);
        if (dialog.open() == Window.OK) {
            colormapHandler.updateRasterSymbolizer(event.display.getActiveShell(), dialog.getColorMap());

            m_widget.updateStylePanel();
        }
    }

    /**
     * protect against too many digits; still ugly, as number of digits depends on real data type...
     */
    private BigDecimal asBigDecimal(final Double value) {
        final BigDecimal decimal = new BigDecimal(Double.toString(value));
        if (decimal.scale() < 5)
            return decimal;

        return decimal.setScale(4, BigDecimal.ROUND_HALF_UP);
    }

    @Override
    public void update() {
        final ICoverage[] allCoverages = m_widget.getCoverages();
        setEnabled(allCoverages != null && allCoverages.length > 0);
    }
}