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Open Source (LGPL) JavaFX PDF Viewer for NetBeans plugin

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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2017 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
 @LICENSE@
 *
 * ---------------
 * FXClip.java
 * ---------------
 */

package org.jpedal.objects;

import javafx.scene.paint.Color;
import javafx.scene.shape.Path;
import javafx.scene.shape.Shape;

/**
 * JavaFX implementation of the PdfClip
 */
public class FXClip implements PdfClip {

    private Shape current_clipping_shape;

    @Override
    public boolean updateClip(final Object path) {

        // Check that the passed parameter is valid.
        // If this code causes trouble in future, it may be due to
        // null instanceof Class, which evaluates to false. null might be needed in resetting the clip
        if (!(path instanceof Shape)) {
            return false;
        }

        final Path fxPath = (Path) path;

        // Fill the path so that everything inside the path becomes the clipping area
        if (fxPath != null) {
            fxPath.setFill(Color.WHITE);
        }

        if (current_clipping_shape == null || fxPath == null) {
            current_clipping_shape = fxPath;
        } else {
            current_clipping_shape = Shape.intersect(current_clipping_shape, fxPath);
        }

        return true;
    }

    @Override
    public Object getClippingShape() {
        return setupClippingShape(current_clipping_shape);
    }

    /**
     * A clip can be used multiple times, but can only be added to a scene once.
     * This method works around it by creating a new shape from the path elements.
     *
     * @param clipping_shape The shape to be copied
     * @return a new Shape containing the clipping Path
     */
    private static Shape setupClippingShape(final Shape clipping_shape) {
        if (clipping_shape == null) {
            return null;
        }

        // Cast is safe as all shapes are drawn as paths
        final Path clipPath = (Path) clipping_shape;
        final Path s = new Path(clipPath.getElements());
        s.setFillRule(clipPath.getFillRule());

        s.setFill(Color.WHITE);

        return s;
    }


}