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/* AnnotatedRenderer.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* 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 2 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.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.graphs.render;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import org.grinvin.graphs.Edge;
import org.grinvin.graphs.Vertex;
/**
* An extension of DefaultRenderer that adds rendering of annotations.
*/
public class AnnotatedRenderer extends DefaultRenderer {
//
private static final Renderer SINGLETON = new AnnotatedRenderer();
/**
* Get the singleton instance of this renderer.
*/
public static Renderer getInstance() {
return SINGLETON;
}
/**
* Paints the given vertex onto the given graphics context, with annotations
* (when available).
*/
public void paint(Vertex vertex, double[] coordinates, boolean rollover, boolean selected, Object annotation, Graphics2D g2) {
super.paint(vertex, coordinates, rollover, selected, annotation, g2);
if (annotation != null) {
paintAnnotation(g2, coordinates[0], coordinates[1],
annotation.toString(), selected);
}
}
/**
* Paints the given edge onto the given graphics context, with annotations
* (when available).
*/
public void paint(Edge edge, double[] coordinates_first, double[] coordinates_second, boolean rollover, boolean selected, Object annotation, Graphics2D g2) {
super.paint(edge, coordinates_first, coordinates_second, rollover, selected, annotation, g2);
if (annotation != null) {
double x = coordinates_first[0] + ((coordinates_second[0] - coordinates_first[0]) / 2);
double y = coordinates_first[1] + ((coordinates_second[1] - coordinates_first[1]) / 2);
paintAnnotation(g2, x, y,
annotation.toString(), selected);
}
}
// Font used for rendering annotations
private Font font = Font.decode("serif-10");
// Vertical offset for annotations
private int voffset = -10;
// Horizontal margin for annotation border
private int hmargin = 2;
// Vertical margin for annotation border
private int vmargin = 0;
// Stroke to be used for annotation border
private Stroke annotationStroke = new BasicStroke(1.0f);
// Color of annotation background
//private Color annotationBackground = new Color (183,204,225,192);
private Color annotationBackground = new Color(183, 204, 225);
// Color of annotation border
private Color annotationBorder = new Color(128, 149, 170);
// Color of select annotation background
//private Color annotationSelected = new Color (174,255,0,192);
//private Color annotationSelected = new Color (131,193, 255);
private Color annotationSelected = new Color(174, 255, 0);
// Paint used for annotation text
private Paint paint = Color.BLACK;
/**
* Paints the annotation of a given element near the given coordinate.
*/
private void paintAnnotation(Graphics2D g2, double x, double y,
String label, boolean selected) {
g2.setFont(font);
FontMetrics metrics = g2.getFontMetrics();
int width = metrics.stringWidth(label);
int top = metrics.getAscent() + vmargin;
int height = top + metrics.getDescent() + vmargin;
Rectangle2D rect = new Rectangle2D.Double(x - width / 2 - hmargin, y + voffset - top, width + 2 * hmargin - 1, height - 1);
g2.setPaint(selected ? annotationSelected : annotationBackground);
g2.fill(rect);
g2.setPaint(paint);
g2.drawString(label, (float) x - width / 2, (float) y + voffset);
g2.setPaint(annotationBorder);
g2.setStroke(annotationStroke);
g2.draw(rect);
}
}
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