de.bund.bfr.knime.gis.views.canvas.RegionCanvasUtils.java Source code

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Here is the source code for de.bund.bfr.knime.gis.views.canvas.RegionCanvasUtils.java

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/*******************************************************************************
 * Copyright (c) 2016 German Federal Institute for Risk Assessment (BfR)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Contributors:
 *     Department Biological Safety - BfR
 *******************************************************************************/
package de.bund.bfr.knime.gis.views.canvas;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.event.MouseEvent;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;

import de.bund.bfr.jung.BetterPickingGraphMousePlugin;
import de.bund.bfr.knime.gis.views.canvas.element.Edge;
import de.bund.bfr.knime.gis.views.canvas.element.RegionNode;
import de.bund.bfr.knime.gis.views.canvas.highlighting.HighlightCondition;
import de.bund.bfr.knime.gis.views.canvas.highlighting.HighlightConditionList;

public class RegionCanvasUtils {

    private RegionCanvasUtils() {
    }

    public static BetterPickingGraphMousePlugin<RegionNode, Edge<RegionNode>> createPickingPlugin(
            GisCanvas<RegionNode> canvas) {
        return new BetterPickingGraphMousePlugin<RegionNode, Edge<RegionNode>>(false) {

            @Override
            protected RegionNode getPickedNode(MouseEvent e) {
                RegionNode node = super.getPickedNode(e);

                if (node != null) {
                    return node;
                } else if (getPickedEdge(e) != null) {
                    return null;
                }

                Point2D p = canvas.getTransform().applyInverse(e.getX(), e.getY());

                return canvas.getNodes().stream().filter(n -> n.containsPoint(p)).findAny().orElse(null);
            }
        };
    }

    public static Rectangle2D getBounds(Collection<RegionNode> nodes) {
        Rectangle2D bounds = null;

        for (RegionNode node : nodes) {
            bounds = bounds != null ? bounds.createUnion(node.getBoundingBox()) : node.getBoundingBox();
        }

        return bounds;
    }

    public static void paintRegions(Graphics2D g, Collection<RegionNode> nodes, Set<RegionNode> selectedNodes,
            HighlightConditionList nodeHighlightConditions) {
        Paint currentPaint = g.getPaint();

        g.setPaint(Color.BLUE);
        selectedNodes.forEach(n -> g.fill(n.getTransformedPolygon()));

        List<Color> nodeColors = new ArrayList<>();
        ListMultimap<RegionNode, Double> nodeAlphas = ArrayListMultimap.create();
        boolean prioritize = nodeHighlightConditions.isPrioritizeColors();

        for (HighlightCondition condition : nodeHighlightConditions.getConditions()) {
            Map<RegionNode, Double> values = condition.getValues(nodes);

            if (condition.getColor() != null) {
                nodeColors.add(condition.getColor());

                for (RegionNode node : nodes) {
                    List<Double> alphas = nodeAlphas.get(node);

                    if (!prioritize || alphas.isEmpty() || Collections.max(alphas) == 0.0) {
                        alphas.add(values.get(node));
                    } else {
                        alphas.add(0.0);
                    }
                }
            }
        }

        for (RegionNode node : nodes) {
            Paint color = CanvasUtils.mixColors(Color.WHITE, nodeColors, nodeAlphas.get(node), false);

            if (!color.equals(Color.WHITE) && !selectedNodes.contains(node)) {
                g.setPaint(color);
                g.fill(node.getTransformedPolygon());
            }
        }

        g.setPaint(currentPaint);
    }
}