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Application Framework for svg with JavaFX.
There is a newer version: 2.0.1
/*
 *
 * ******************************************************************************
 *  * Copyright 2015 - 2015 Xyanid
 *  *
 *  * Licensed under the Apache License, Version 2.0 (the "License");
 *  * you may not use this file except in compliance with the License.
 *  * You may obtain a copy of the License at
 *  *
 *  *   http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  * Unless required by applicable law or agreed to in writing, software
 *  * distributed under the License is distributed on an "AS IS" BASIS,
 *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  * See the License for the specific language governing permissions and
 *  * limitations under the License.
 *  *****************************************************************************
 */

package de.saxsys.svgfx.core.elements;

import de.saxsys.svgfx.core.SVGDataProvider;
import de.saxsys.svgfx.core.SVGException;
import de.saxsys.svgfx.core.css.SVGCssStyle;
import de.saxsys.svgfx.core.utils.StringUtils;
import javafx.scene.paint.CycleMethod;
import javafx.scene.paint.RadialGradient;
import javafx.scene.paint.Stop;
import org.xml.sax.Attributes;

import java.util.List;

/**
 * This Class represents a radial gradient from svg
 *
 * @author Xyanid on 25.10.2015.
 */
@SVGElementMapping("radialGradient")
public class SVGRadialGradient extends SVGGradientBase {

    //region Constructor

    /**
     * Creates a new instance of he element using the given attributes and the parent.
     *
     * @param name         value of the element
     * @param attributes   attributes of the element
     * @param parent       parent of the element
     * @param dataProvider dataprovider to be used
     */
    public SVGRadialGradient(final String name, final Attributes attributes, final SVGElementBase parent, final SVGDataProvider dataProvider) {
        super(name, attributes, parent, dataProvider);
    }

    //endregion

    //region Override SVGGradientBase

    @Override
    protected final RadialGradient createResult(final SVGCssStyle style) {

        List stops = getStops();

        if (stops.isEmpty()) {
            throw new SVGException("Given radial gradient does not have colors");
        }

        String centerX = getAttribute(CoreAttribute.CENTER_X.getName());
        String centerY = getAttribute(CoreAttribute.CENTER_Y.getName());
        String focusX = getAttribute(CoreAttribute.FOCUS_X.getName());
        String focusY = getAttribute(CoreAttribute.FOCUS_Y.getName());

        double cx = StringUtils.isNullOrEmpty(centerX) ? 0.0d : Double.parseDouble(centerX);
        double cy = StringUtils.isNullOrEmpty(centerY) ? 0.0d : Double.parseDouble(centerY);

        double fx = StringUtils.isNullOrEmpty(focusX) ? cx : Double.parseDouble(focusX);
        double fy = StringUtils.isNullOrEmpty(focusY) ? cy : Double.parseDouble(focusY);

        double diffX = fx - cx;
        double diffY = fy - cy;

        double distance = diffX != 0 && diffY != 0 ? Math.hypot(diffX, diffY) : 0;
        double angle = diffX != 0 && diffY != 0 ? Math.atan2(diffY, diffX) : 0;

        // TODO figure out if the focus angle is correct or not

        return new RadialGradient(angle, distance, cx, cy, Double.parseDouble(getAttribute(CoreAttribute.RADIUS.getName())), false, CycleMethod.NO_CYCLE, stops);
    }

    //endregion
}