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/* DefaultRenderer.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.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import org.grinvin.graphs.Edge;
import org.grinvin.graphs.Vertex;
/**
* Default implementation of a renderer. Renders vertices as small circles
* and edges as solid lines. Is a singleton class whose sole instance should
* be retrieved by means of the method {@link #getInstance}.
*/
public class DefaultRenderer implements Renderer {
// Radius of a circle that represents a vertex
private double radius = 4.0;
// Radius of the circle that represents the current 'roll over'-vertex
private double rollOverRadius = 5.0;
// Paint to use when filling the vertex circle
private Paint fillPaint = Color.WHITE;
// Stroke used to draw the vertex circle border
private Stroke borderStroke = new BasicStroke(2.0f);
// Stroke used to draw a normal edge
private Stroke stroke = new BasicStroke(2.0f);
// Stroke to use to draw a 'roll over'-edge
private Stroke rollOverStroke = new BasicStroke(3.0f);
// Paint used for normal vertex circle borders and edges
private Paint paint = Color.BLACK;
// Paint used for selected vertex circle borders and edges
private Paint selectedPaint = new Color(0, 127, 255);
//
protected DefaultRenderer () { }
//
private static final Renderer SINGLETON = new DefaultRenderer();
/**
* Get the singleton instance of this renderer.
*/
public static Renderer getInstance () {
return SINGLETON;
}
// implements Renderer
/**
* Render a Vertex
* @param vertex Vertex to render
* @param coordinates Coordinates of the Vertex
* @param rollover Is this the current rollover?
* @param selected Is this Vertex selected?
* @param g2 Panel to paint on
*/
public void paint(Vertex vertex, double[] coordinates, boolean rollover, boolean selected, Object annotation, Graphics2D g2) {
double r = rollover ? rollOverRadius : radius;
Ellipse2D ell = new Ellipse2D.Double(coordinates[0]-r,coordinates[1]-r,2*r,2*r);
g2.setPaint(fillPaint);
g2.fill(ell);
g2.setPaint(selected ? selectedPaint : paint);
g2.setStroke(borderStroke);
g2.draw(ell);
}
// implements Renderer
/**
* Render an Edge
* @param edge Edge to render
* @param coordinates_first Coordinates of the first Vertex
* @param coordinates_second Coordinates of the second Vertex
* @param rollover Is this the current rollover?
* @param selected Is this Edge selected?
* @param g2 Panel to paint on
*/
public void paint(Edge edge, double[] coordinates_first, double[] coordinates_second, boolean rollover, boolean selected, Object annotation, Graphics2D g2) {
Shape shape;
if (!edge.getFirstEndpoint().equals(edge.getSecondEndpoint())) {
shape = new Line2D.Double(
coordinates_first[0],
coordinates_first[1],
coordinates_second[0],
coordinates_second[1]);
} else {
shape = new Ellipse2D.Double(
coordinates_first[0],
coordinates_first[1],
10,
10);
}
g2.setPaint(selected ? selectedPaint : paint);
g2.setStroke(rollover ? rollOverStroke : stroke);
g2.draw(shape);
}
}
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