/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2001 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.modules.parser.ext.factory.objects;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.PathIterator;
import java.util.ArrayList;
import org.pentaho.reporting.engine.classic.core.modules.parser.ext.factory.base.AbstractObjectDescription;
import org.pentaho.reporting.engine.classic.core.modules.parser.ext.factory.base.ObjectFactoryException;
/**
* An Object Description for general shapes and the GeneralPath-class.
*
* @author Thomas Morgner
*/
public class GeneralPathObjectDescription extends AbstractObjectDescription
{
/**
* A constant for the "segments" parameter.
*/
private static final String SEGMENTS_NAME = "segments";
/**
* A constant for the "windingRule" parameter.
*/
private static final String WINDING_RULE_NAME = "windingRule";
/**
* A constant value for the "windingRule" parameter.
*/
private static final String WINDING_RULE_EVEN_ODD = "wind-even-odd";
/**
* A constant value for the "windingRule" parameter.
*/
private static final String WINDING_RULE_NON_ZERO = "wind-non-zero";
/**
* The number of maximum points in a path iterator segment.
*/
private static final int MAX_POINTS = 6;
/**
* DefaultConstructor. Initializes this object description to produce GeneralPath objects.
*/
public GeneralPathObjectDescription()
{
this(GeneralPath.class);
}
/**
* Creates a new GeneralPathObjectDescription. The given class must be an instance of an shape, the generated objects
* will be general path objects.
*
* @param c the registered base class, an instance of shape.
*/
public GeneralPathObjectDescription(final Class c)
{
super(c);
if (Shape.class.isAssignableFrom(c) == false)
{
throw new IllegalArgumentException("Must be a shape instance");
}
// "even-odd" or "non-zero"
setParameterDefinition(GeneralPathObjectDescription.WINDING_RULE_NAME, String.class);
setParameterDefinition(GeneralPathObjectDescription.SEGMENTS_NAME, PathIteratorSegment[].class);
}
/**
* Creates an object based on this description.
*
* @return The object.
*/
public Object createObject()
{
final int wRule = parseWindingRule();
if (wRule == -1)
{
return null;
}
final PathIteratorSegment[] segments = (PathIteratorSegment[]) getParameter(
GeneralPathObjectDescription.SEGMENTS_NAME);
if (segments == null)
{
return null;
}
final GeneralPath path = new GeneralPath();
path.setWindingRule(wRule);
for (int i = 0; i < segments.length; i++)
{
final int segmentType = segments[i].getSegmentType();
switch (segmentType)
{
case PathIterator.SEG_CLOSE:
{
path.closePath();
break;
}
case PathIterator.SEG_CUBICTO:
{
path.curveTo(segments[i].getX1(), segments[i].getY1(),
segments[i].getX2(), segments[i].getY2(),
segments[i].getX3(), segments[i].getY3());
break;
}
case PathIterator.SEG_LINETO:
{
path.lineTo(segments[i].getX1(), segments[i].getY1());
break;
}
case PathIterator.SEG_MOVETO:
{
path.moveTo(segments[i].getX1(), segments[i].getY1());
break;
}
case PathIterator.SEG_QUADTO:
{
path.quadTo(segments[i].getX1(), segments[i].getY1(),
segments[i].getX2(), segments[i].getY2());
break;
}
default:
throw new IllegalStateException("Unexpected result from path iterator.");
}
}
return path;
}
/**
* Translates the winding rule parameter into a predefined PathIterator constant.
*
* @return the translated winding rule or -1 if the rule was invalid.
*/
private int parseWindingRule()
{
final String windingRule = (String) getParameter(GeneralPathObjectDescription.WINDING_RULE_NAME);
int wRule = -1;
if (windingRule == null)
{
return wRule;
}
if (windingRule.equals(GeneralPathObjectDescription.WINDING_RULE_EVEN_ODD))
{
wRule = PathIterator.WIND_EVEN_ODD;
}
else if (windingRule.equals(GeneralPathObjectDescription.WINDING_RULE_NON_ZERO))
{
wRule = PathIterator.WIND_NON_ZERO;
}
return wRule;
}
/**
* Sets the parameters of this description object to match the supplied object.
*
* @param o the object (should be an instance of <code>FontDefinition</code>).
* @throws ObjectFactoryException if the object is not an instance of <code>Float</code>.
*/
public void setParameterFromObject(final Object o)
throws ObjectFactoryException
{
if (getObjectClass().isAssignableFrom(o.getClass()) == false)
{
throw new ObjectFactoryException("Class is not assignable");
}
final Shape s = (Shape) o;
final PathIterator pi = s.getPathIterator(AffineTransform.getTranslateInstance(0, 0));
if (pi.getWindingRule() == PathIterator.WIND_EVEN_ODD)
{
setParameter(GeneralPathObjectDescription.WINDING_RULE_NAME, GeneralPathObjectDescription.WINDING_RULE_EVEN_ODD);
}
else
{
setParameter(GeneralPathObjectDescription.WINDING_RULE_NAME, GeneralPathObjectDescription.WINDING_RULE_NON_ZERO);
}
final float[] points = new float[GeneralPathObjectDescription.MAX_POINTS];
final ArrayList segments = new ArrayList();
while (pi.isDone() == false)
{
final int type = pi.currentSegment(points);
final PathIteratorSegment seg = new PathIteratorSegment();
switch (type)
{
case PathIterator.SEG_CLOSE:
{
seg.setSegmentType(PathIterator.SEG_CLOSE);
break;
}
case PathIterator.SEG_CUBICTO:
{
seg.setSegmentType(PathIterator.SEG_CUBICTO);
seg.setX1(points[0]);
seg.setY1(points[1]);
seg.setX2(points[2]);
seg.setY2(points[3]);
seg.setX3(points[4]);
seg.setY3(points[5]);
break;
}
case PathIterator.SEG_LINETO:
{
seg.setSegmentType(PathIterator.SEG_LINETO);
seg.setX1(points[0]);
seg.setY1(points[1]);
break;
}
case PathIterator.SEG_MOVETO:
{
seg.setSegmentType(PathIterator.SEG_MOVETO);
seg.setX1(points[0]);
seg.setY1(points[1]);
break;
}
case PathIterator.SEG_QUADTO:
{
seg.setSegmentType(PathIterator.SEG_QUADTO);
seg.setX1(points[0]);
seg.setY1(points[1]);
seg.setX2(points[2]);
seg.setY2(points[3]);
break;
}
default:
throw new IllegalStateException("Unexpected result from PathIterator.");
}
segments.add(seg);
pi.next();
}
setParameter(GeneralPathObjectDescription.SEGMENTS_NAME, segments.toArray(
new PathIteratorSegment[segments.size()]));
}
}