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jtstand-common is a library derived from jcommon, used by jtstand-chart, which is derived from jfreechart

There is a newer version: 1.5.9

/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, Line2DObjectDescription.java is part of JTStand.
 *
 * JTStand 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 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand 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 GTStand.  If not, see .
 */

package org.jfree.xml.factory.objects;

import java.awt.geom.Line2D;

/**
 * An object-description for a Line2D object.
 *
 * @author Thomas Morgner
 */
public class Line2DObjectDescription extends AbstractObjectDescription {

    /**
     * Creates a new object description.
     */
    public Line2DObjectDescription() {
        super(Line2D.class);
        setParameterDefinition("x1", Float.class);
        setParameterDefinition("x2", Float.class);
        setParameterDefinition("y1", Float.class);
        setParameterDefinition("y2", Float.class);
    }

    /**
     * Creates an object based on this description.
     *
     * @return The object.
     */
    public Object createObject() {
        final Line2D line = new Line2D.Float();

        final float x1 = getFloatParameter("x1");
        final float x2 = getFloatParameter("x2");
        final float y1 = getFloatParameter("y1");
        final float y2 = getFloatParameter("y2");
        line.setLine(x1, y1, x2, y2);
        return line;
    }

    /**
     * Returns a parameter value as a float.
     *
     * @param param  the parameter name.
     *
     * @return The float value.
     */
    private float getFloatParameter(final String param) {
        final Float p = (Float) getParameter(param);
        if (p == null) {
            return 0;
        }
        return p.floatValue();
    }

    /**
     * Sets the parameters of this description object to match the supplied object.
     *
     * @param o  the object (should be an instance of Line2D).
     *
     * @throws ObjectFactoryException if the object is not an instance of Line2D.
     */
    public void setParameterFromObject(final Object o) throws ObjectFactoryException {
        if (!(o instanceof Line2D)) {
            throw new ObjectFactoryException("The given object is no java.awt.geom.Line2D.");
        }
        final Line2D line = (Line2D) o;
        final float x1 = (float) line.getX1();
        final float x2 = (float) line.getX2();
        final float y1 = (float) line.getY1();
        final float y2 = (float) line.getY2();

        setParameter("x1", new Float(x1));
        setParameter("x2", new Float(x2));
        setParameter("y1", new Float(y1));
        setParameter("y2", new Float(y2));
    }
}