com.rapidminer.gui.graphs.ExtendedVertexShapeTransformer.java Source code

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Here is the source code for com.rapidminer.gui.graphs.ExtendedVertexShapeTransformer.java

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/**
 * Copyright (C) 2001-2015 by RapidMiner and the contributors
 *
 * Complete list of developers available at our web site:
 *
 *      http://rapidminer.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.graphs;

import java.awt.Shape;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;

import org.apache.commons.collections15.Transformer;

/**
 * The extended vertex shaper for the {@link GraphViewer}.
 * 
 * @author Ingo Mierswa
 */
public class ExtendedVertexShapeTransformer<V> implements Transformer<V, Shape> {

    private GraphCreator<V, ?> graphCreator;

    public ExtendedVertexShapeTransformer(GraphCreator<V, ?> graphCreator) {
        this.graphCreator = graphCreator;
    }

    @Override
    public Shape transform(V object) {
        if (graphCreator.isLeaf(object)) {
            // leaf
            String text = graphCreator.getVertexName(object);
            Rectangle2D stringBounds = GraphViewer.VERTEX_BOLD_FONT.getStringBounds(text,
                    new FontRenderContext(null, false, false));
            float width = (float) stringBounds.getWidth();
            float height = (float) stringBounds.getHeight();
            int minWidth = graphCreator.getMinLeafWidth();
            int minHeight = graphCreator.getMinLeafHeight();
            width = Math.max(width, minWidth);
            height = Math.max(height, minHeight);
            return new Rectangle2D.Float(-width / 2.0f - 6.0f, -height / 2.0f - 2.0f, width + 8.0f, height + 4.0f);
        } else {
            // inner nodes
            String text = graphCreator.getVertexName(object);
            Rectangle2D stringBounds = GraphViewer.VERTEX_PLAIN_FONT.getStringBounds(text,
                    new FontRenderContext(null, false, false));
            float width = (float) stringBounds.getWidth();
            float height = (float) stringBounds.getHeight();
            RoundRectangle2D.Float shape = new RoundRectangle2D.Float(-width / 2.0f - 6.0f, -height / 2.0f - 4.0f,
                    width + 10.0f, height + 8.0f, 10.0f, 10.0f);
            return shape;
        }
    }
}