/*
* 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 - 2013 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()] ) );
}
}