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/*
* @(#)JGraphEllipseView.java 1.0 12-MAY-2004
*
* Copyright (c) 2001-2005, Gaudenz Alder
* All rights reserved.
*
* 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
*
*/
package com.jgraph.example.fastgraph;
import java.awt.BasicStroke;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import org.jgraph.graph.CellViewRenderer;
import org.jgraph.graph.GraphConstants;
import org.jgraph.graph.VertexRenderer;
/**
* @author Gaudenz Alder
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Generation - Code and Comments
*/
public class FastCircleView extends FastVertexView {
/**
* The renderer for this view
*/
public static transient JGraphEllipseRenderer renderer = new JGraphEllipseRenderer();
/**
* The default constructor
*/
public FastCircleView() {
super();
}
/**
* Constructs a fast circle view associated this view with the specified
* cell
* @param cell the model cell to associated this view with
*/
public FastCircleView(Object cell) {
super(cell);
}
/**
* Returns the intersection of the bounding rectangle and the
* straight line between the source and the specified point p.
* The specified point is expected not to intersect the bounds.
*/
public Point2D getPerimeterPoint(Point2D source, Point2D p) {
Rectangle2D r = getBounds();
double x = r.getX();
double y = r.getY();
double a = (r.getWidth() + 1) / 2;
double b = (r.getHeight() + 1) / 2;
// x0,y0 - center of ellipse
double x0 = x + a;
double y0 = y + b;
// x1, y1 - point
double x1 = p.getX();
double y1 = p.getY();
// calculate straight line equation through point and ellipse center
// y = d * x + h
double dx = x1 - x0;
double dy = y1 - y0;
if (dx == 0)
return new Point((int) x0, (int) (y0 + b * dy / Math.abs(dy)));
double d = dy / dx;
double h = y0 - d * x0;
// calculate intersection
double e = a * a * d * d + b * b;
double f = - 2 * x0 * e;
double g = a * a * d * d * x0 * x0 + b * b * x0 * x0 - a * a * b * b;
double det = Math.sqrt(f * f - 4 * e * g);
// two solutions (perimeter points)
double xout1 = (-f + det) / (2 * e);
double xout2 = (-f - det) / (2 * e);
double yout1 = d * xout1 + h;
double yout2 = d * xout2 + h;
double dist1Squ = Math.pow((xout1 - x1), 2)
+ Math.pow((yout1 - y1), 2);
double dist2Squ = Math.pow((xout2 - x1), 2)
+ Math.pow((yout2 - y1), 2);
// correct solution
double xout, yout;
if (dist1Squ < dist2Squ) {
xout = xout1;
yout = yout1;
} else {
xout = xout2;
yout = yout2;
}
return getAttributes().createPoint(xout, yout);
}
/**
* @return the renderer for this view
*/
public CellViewRenderer getRenderer() {
return renderer;
}
/**
* The renderer for this view
*/
public static class JGraphEllipseRenderer extends VertexRenderer {
/**
* Return a slightly larger preferred size than for a rectangle.
*/
public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
d.width += d.width/8;
d.height += d.height/2;
return d;
}
/**
* The method that draws the cell
*/
public void paint(Graphics g) {
int b = borderWidth;
Graphics2D g2 = (Graphics2D) g;
Dimension d = getSize();
boolean tmp = selected;
if (super.isOpaque()) {
g.setColor(super.getBackground());
if (gradientColor != null && !preview) {
setOpaque(false);
g2.setPaint(new GradientPaint(0, 0, getBackground(), getWidth(),
getHeight(), gradientColor, true));
}
g.fillOval(b - 1, b - 1, d.width - b, d.height - b);
}
try {
setBorder(null);
setOpaque(false);
selected = false;
super.paint(g);
} finally {
selected = tmp;
}
if (bordercolor != null) {
g.setColor(bordercolor);
g2.setStroke(new BasicStroke(b));
g.drawOval(b - 1, b - 1, d.width - b, d.height - b);
}
if (selected) {
g2.setStroke(GraphConstants.SELECTION_STROKE);
g.setColor(highlightColor);
g.drawOval(b - 1, b - 1, d.width - b, d.height - b);
}
}
}
}
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