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/*
* Copyright 2003-2004, Franz-Josef Elmer, 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 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
* (http://www.gnu.org/copyleft/lesser.html).
*
* 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 jcckit.plot;
import jcckit.graphic.GraphPoint;
import jcckit.graphic.GraphicAttributes;
import jcckit.graphic.GraphicalElement;
import jcckit.util.ConfigParameters;
import jcckit.util.Factory;
/**
* Abstract superclass of all {@link SymbolFactory SymbolFactories}.
* Subclasses have to implement {@link #createPlainSymbol createPlainSymbol()}.
*
* @author Franz-Josef Elmer
*/
public abstract class AbstractSymbolFactory implements SymbolFactory {
/** Size of all symbols. */
protected final double _size;
/** Attributes of all symbols. */
protected final GraphicAttributes _attributes;
/**
* Creates an instance from the specified configuration parameters.
*
*
Key & Default Value
Type
Mandatory
*
Description
*
size = 0.01
*
double
no
*
Size of the symbol in device-independent units.
*
attributes
*
ConfigParameters
no
*
Configuration parameters for the attributes of the symbol.
* className has to be a class which is an instance of
* {@link GraphicAttributes}.
*
*/
public AbstractSymbolFactory(ConfigParameters config) {
_size = config.getDouble(SIZE_KEY, DEFAULT_SIZE);
_attributes = (GraphicAttributes) Factory.createOrGet(
config.getNode(ATTRIBUTES_KEY), null);
}
/**
* Creates a symbol.
* Evaluate hintFromPreviousPoint if it is a {@link AttributesHint}.
* Calls {@link #createSymbol(GraphPoint, GraphicAttributes, Hint, Hint)}.
* @param point Symbol position.
* @param hintFromPreviousPoint Hint from the previous point.
* @param hintFromPreviousCurve Hint from the previous curve.
*/
public Symbol createSymbol(GraphPoint point, Hint hintFromPreviousPoint,
Hint hintFromPreviousCurve) {
GraphicAttributes attributes = _attributes;
Hint hintForNextPoint = hintFromPreviousPoint;
if (hintFromPreviousPoint instanceof AttributesHint) {
attributes = ((AttributesHint) hintFromPreviousPoint).getAttributes();
hintForNextPoint
= ((AttributesHint) hintFromPreviousPoint).getNextHint();
}
return createSymbol(point, attributes, hintForNextPoint,
hintFromPreviousCurve);
}
/**
* Creates a symbol.
* Uses {@link #createPlainSymbol createPlainSymbol()}.
* @param point Symbol position.
* @param attributes Symbol attributes.
* @param hintForNextPoint Hint for the next point. Will be delivered
* unchanged in the return Symbol object.
* @param hintFromPreviousCurve Hint from the previous curve.
* Will be delivered unchanged in the return Symbol object.
* Subclasses may override this behavior.
*/
protected Symbol createSymbol(GraphPoint point, GraphicAttributes attributes,
Hint hintForNextPoint,
Hint hintFromPreviousCurve) {
return new Symbol(createPlainSymbol(point, _size, attributes),
hintForNextPoint, hintFromPreviousCurve);
}
/**
* Creates a symbol for the legend at the specified position.
* Uses {@link #createPlainSymbol createPlainSymbol()}
* @param centerPosition Center position of the symbol.
* @param size The size of the symbol. Will be ignored because the value
* given in the constructor will be used.
*/
public GraphicalElement createLegendSymbol(GraphPoint centerPosition,
double size) {
return createPlainSymbol(centerPosition, _size, _attributes);
}
/**
* Creates the graphical element of the plain symbol.
* @param centerPosition Center position of the symbol.
* @param size The size of the symbol.
* @param attributes The attributes of the symbol.
*/
protected abstract GraphicalElement createPlainSymbol(
GraphPoint centerPosition, double size, GraphicAttributes attributes);
}
