Serialises a Shape object.
import java.awt.Shape;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.PathIterator;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
/*
* JCommon : a free general purpose class library for the Java(tm) platform
*
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/index.html
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* IOUtils.java
* ------------
* (C)opyright 2002-2004, by Thomas Morgner and Contributors.
*
* Original Author: Thomas Morgner;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* $Id: IOUtils.java,v 1.8 2009/01/22 08:34:58 taqua Exp $
*
* Changes
* -------
* 26-Jan-2003 : Initial version
* 23-Feb-2003 : Documentation
* 25-Feb-2003 : Fixed Checkstyle issues (DG);
* 29-Apr-2003 : Moved to jcommon
* 04-Jan-2004 : Fixed JDK 1.2.2 issues with createRelativeURL;
* added support for query strings within these urls (TM);
*/
public class Main {
/**
* Returns <code>true</code> if a class implements <code>Serializable</code>
* and <code>false</code> otherwise.
*
* @param c the class.
*
* @return A boolean.
*/
public static boolean isSerializable(final Class c) {
/**
final Class[] interfaces = c.getInterfaces();
for (int i = 0; i < interfaces.length; i++) {
if (interfaces[i].equals(Serializable.class)) {
return true;
}
}
Class cc = c.getSuperclass();
if (cc != null) {
return isSerializable(cc);
}
*/
return (Serializable.class.isAssignableFrom(c));
}
/**
* Reads a <code>Shape</code> object that has been serialised by the
* {@link #writeShape(Shape, ObjectOutputStream)} method.
*
* @param stream the input stream (<code>null</code> not permitted).
*
* @return The shape object (possibly <code>null</code>).
*
* @throws IOException if there is an I/O problem.
* @throws ClassNotFoundException if there is a problem loading a class.
*/
public static Shape readShape(final ObjectInputStream stream)
throws IOException, ClassNotFoundException {
if (stream == null) {
throw new IllegalArgumentException("Null 'stream' argument.");
}
Shape result = null;
final boolean isNull = stream.readBoolean();
if (!isNull) {
final Class c = (Class) stream.readObject();
if (c.equals(Line2D.class)) {
final double x1 = stream.readDouble();
final double y1 = stream.readDouble();
final double x2 = stream.readDouble();
final double y2 = stream.readDouble();
result = new Line2D.Double(x1, y1, x2, y2);
}
else if (c.equals(Rectangle2D.class)) {
final double x = stream.readDouble();
final double y = stream.readDouble();
final double w = stream.readDouble();
final double h = stream.readDouble();
result = new Rectangle2D.Double(x, y, w, h);
}
else if (c.equals(Ellipse2D.class)) {
final double x = stream.readDouble();
final double y = stream.readDouble();
final double w = stream.readDouble();
final double h = stream.readDouble();
result = new Ellipse2D.Double(x, y, w, h);
}
else if (c.equals(Arc2D.class)) {
final double x = stream.readDouble();
final double y = stream.readDouble();
final double w = stream.readDouble();
final double h = stream.readDouble();
final double as = stream.readDouble(); // Angle Start
final double ae = stream.readDouble(); // Angle Extent
final int at = stream.readInt(); // Arc type
result = new Arc2D.Double(x, y, w, h, as, ae, at);
}
else if (c.equals(GeneralPath.class)) {
final GeneralPath gp = new GeneralPath();
final float[] args = new float[6];
boolean hasNext = stream.readBoolean();
while (!hasNext) {
final int type = stream.readInt();
for (int i = 0; i < 6; i++) {
args[i] = stream.readFloat();
}
switch (type) {
case PathIterator.SEG_MOVETO :
gp.moveTo(args[0], args[1]);
break;
case PathIterator.SEG_LINETO :
gp.lineTo(args[0], args[1]);
break;
case PathIterator.SEG_CUBICTO :
gp.curveTo(args[0], args[1], args[2],
args[3], args[4], args[5]);
break;
case PathIterator.SEG_QUADTO :
gp.quadTo(args[0], args[1], args[2], args[3]);
break;
case PathIterator.SEG_CLOSE :
gp.closePath();
break;
default :
throw new RuntimeException(
"JFreeChart - No path exists");
}
gp.setWindingRule(stream.readInt());
hasNext = stream.readBoolean();
}
result = gp;
}
else {
result = (Shape) stream.readObject();
}
}
return result;
}
/**
* Serialises a <code>Shape</code> object.
*
* @param shape the shape object (<code>null</code> permitted).
* @param stream the output stream (<code>null</code> not permitted).
*
* @throws IOException if there is an I/O error.
*/
public static void writeShape(final Shape shape,
final ObjectOutputStream stream)
throws IOException {
if (stream == null) {
throw new IllegalArgumentException("Null 'stream' argument.");
}
if (shape != null) {
stream.writeBoolean(false);
if (shape instanceof Line2D) {
final Line2D line = (Line2D) shape;
stream.writeObject(Line2D.class);
stream.writeDouble(line.getX1());
stream.writeDouble(line.getY1());
stream.writeDouble(line.getX2());
stream.writeDouble(line.getY2());
}
else if (shape instanceof Rectangle2D) {
final Rectangle2D rectangle = (Rectangle2D) shape;
stream.writeObject(Rectangle2D.class);
stream.writeDouble(rectangle.getX());
stream.writeDouble(rectangle.getY());
stream.writeDouble(rectangle.getWidth());
stream.writeDouble(rectangle.getHeight());
}
else if (shape instanceof Ellipse2D) {
final Ellipse2D ellipse = (Ellipse2D) shape;
stream.writeObject(Ellipse2D.class);
stream.writeDouble(ellipse.getX());
stream.writeDouble(ellipse.getY());
stream.writeDouble(ellipse.getWidth());
stream.writeDouble(ellipse.getHeight());
}
else if (shape instanceof Arc2D) {
final Arc2D arc = (Arc2D) shape;
stream.writeObject(Arc2D.class);
stream.writeDouble(arc.getX());
stream.writeDouble(arc.getY());
stream.writeDouble(arc.getWidth());
stream.writeDouble(arc.getHeight());
stream.writeDouble(arc.getAngleStart());
stream.writeDouble(arc.getAngleExtent());
stream.writeInt(arc.getArcType());
}
else if (shape instanceof GeneralPath) {
stream.writeObject(GeneralPath.class);
final PathIterator pi = shape.getPathIterator(null);
final float[] args = new float[6];
stream.writeBoolean(pi.isDone());
while (!pi.isDone()) {
final int type = pi.currentSegment(args);
stream.writeInt(type);
// TODO: could write this to only stream the values
// required for the segment type
for (int i = 0; i < 6; i++) {
stream.writeFloat(args[i]);
}
stream.writeInt(pi.getWindingRule());
pi.next();
stream.writeBoolean(pi.isDone());
}
}
else {
stream.writeObject(shape.getClass());
stream.writeObject(shape);
}
}
else {
stream.writeBoolean(true);
}
}
}
Related examples in the same category
| 1. | Creating Basic Shapes | | |
| 2. | fillRect (int, int, int, int) method draws a solid rectangle | | |
| 3. | Creating a Shape Using Lines and Curves | | |
| 4. | Combining Shapes | | |
| 5. | Draw rectangles, use the drawRect() method. To fill rectangles, use the fillRect() method | | |
| 6. | Draw line | |  |
| 7. | Draw a Polygon | |  |
| 8. | Draw an oval outline | | |
| 9. | Draw a (Round)rectangle | |  |
| 10. | Fill a polygon | |  |
| 11. | Fill a solid oval | | |
| 12. | Fill a (Round)rectangle | |  |
| 13. | Change font | |  |
| 14. | Draw rectangle 2 | |  |
| 15. | Draw Arc | |  |
| 16. | Draw Ellipse | |  |
| 17. | Fill a Rectangle 2 | |  |
| 18. | Fill Arc 2 | |  |
| 19. | Draw text | |  |
| 20. | Draw unicode string | |  |
| 21. | Shape combine | |  |
| 22. | Effects | |  |
| 23. | Mouse drag and drop to draw | |  |
| 24. | Arc demonstration: scale, move, rotate, sheer | |  |
| 25. | Hypnosis Spiral | |  |
| 26. | GlyphVector.getNumGlyphs() | | |
| 27. | Resize a shape | | |
| 28. | Rectangle with rounded corners drawn using Java 2D Graphics API | | |
| 29. | Compares two ellipses and returns true if they are equal or both null. | | |
| 30. | Compares two lines are returns true if they are equal or both null. | | |
| 31. | Creates a diagonal cross shape. | | |
| 32. | Creates a diamond shape. | | |
| 33. | Creates a new Stroke-Object for the given type and with. | | |
| 34. | Creates a region surrounding a line segment by 'widening' the line segment. | | |
| 35. | Creates a triangle shape that points downwards. | | |
| 36. | Creates a triangle shape that points upwards. | | |
| 37. | Generate Polygon | | |
| 38. | Polygon with float coordinates. | | |
| 39. | Polyline 2D | | |
| 40. | Tests two polygons for equality. If both are null this method returns true. | | |
| 41. | Union two rectangles | | |
| 42. | Calculate Intersection Clip | | |
| 43. | Draws a shape with the specified rotation about (x, y). | | |
| 44. | Checks, whether the given rectangle1 fully contains rectangle 2 (even if rectangle 2 has a height or width of zero!). | | |
| 45. | Reads a Point2D object that has been serialised by the writePoint2D(Point2D, ObjectOutputStream)} method. | | |
| 46. | Returns a point based on (x, y) but constrained to be within the bounds of a given rectangle. | | |
| 47. | RectListManager is a class to manage a list of rectangular regions. | | |
| 48. | Fill Rectangle2D.Double and Ellipse2D.Double | |  |
| 49. | This program demonstrates the various 2D shapes | |  |