Edit C:\Program Files\Java\jdk1.8.0_121\javafx\scene\shape\Polygon.java

/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javafx.scene.shape;

import com.sun.javafx.collections.TrackableObservableList;
import com.sun.javafx.geom.BaseBounds;
import com.sun.javafx.geom.Path2D;
import com.sun.javafx.geom.transform.BaseTransform;
import com.sun.javafx.scene.DirtyBits;
import com.sun.javafx.sg.prism.NGNode;
import com.sun.javafx.sg.prism.NGPolygon;
import com.sun.javafx.sg.prism.NGShape;
import javafx.collections.ListChangeListener.Change;
import javafx.collections.ObservableList;
import javafx.scene.paint.Paint;

/**
 * Creates a polygon, defined by an array of x,y coordinates. The Polygon
 * class is similar to the Polyline class, except that the Polyline class
 * is not automatically closed.
 *
<PRE>
import javafx.scene.shape.*;

Polygon polygon = new Polygon();
polygon.getPoints().addAll(new Double[]{
    0.0, 0.0,
    20.0, 10.0,
    10.0, 20.0 });
</PRE>
 * @since JavaFX 2.0
 */
public  class Polygon extends Shape {

private final Path2D shape = new Path2D();

/**
     * Creates an empty instance of Polygon.
     */
    public Polygon() {
    }

/**
     * Creates a new instance of Polygon.
     * @param points the coordinates of the polygon vertices
     */
    public Polygon(double... points) {
        if (points != null) {
            for (double p : points) {
                this.getPoints().add(p);
            }
        }
    }

/**
     * Defines the coordinates of the polygon vertices.
     *
     * @defaultValue empty
     */
    private final ObservableList<Double> points = new TrackableObservableList<Double>() {
        @Override
        protected void onChanged(Change<Double> c) {
            impl_markDirty(DirtyBits.NODE_GEOMETRY);
            impl_geomChanged();
        }
    };

/**
     * Gets the coordinates of the {@code Polygon} vertices.
     * @return An observable list of vertices of this {@code Polygon}
     */
    public final ObservableList<Double> getPoints() { return points; }

/**
     * @treatAsPrivate implementation detail
     * @deprecated This is an internal API that is not intended for use and will be removed in the next version
     */
    @Deprecated
    protected NGNode impl_createPeer() {
        return new NGPolygon();
    }

/**
     * @treatAsPrivate implementation detail
     * @deprecated This is an internal API that is not intended for use and will be removed in the next version
     */
    @Deprecated
    public BaseBounds impl_computeGeomBounds(BaseBounds bounds, BaseTransform tx) {
        if (impl_mode == NGShape.Mode.EMPTY || getPoints().size() <= 1) {
            return bounds.makeEmpty();
        }

if (getPoints().size() == 2) {
            if (impl_mode == NGShape.Mode.FILL || getStrokeType() == StrokeType.INSIDE) {
                return bounds.makeEmpty();
            }
            double upad = getStrokeWidth();
            if (getStrokeType() == StrokeType.CENTERED) {
                upad /= 2.0f;
            }
            return computeBounds(bounds, tx, upad, 0.5f,
                getPoints().get(0), getPoints().get(1), 0.0f, 0.0f);
        } else {
            return computeShapeBounds(bounds, tx, impl_configShape());
        }
    }

/**
     * @treatAsPrivate implementation detail
     * @deprecated This is an internal API that is not intended for use and will be removed in the next version
     */
    @Deprecated
    @Override
    public Path2D impl_configShape() {
        double p1 = getPoints().get(0);
        double p2 = getPoints().get(1);
        shape.reset();
        shape.moveTo((float)p1, (float)p2);
        final int numValidPoints = getPoints().size() & ~1;
        for (int i = 2; i < numValidPoints; i += 2) {
            p1 = getPoints().get(i); p2 = getPoints().get(i+1);
            shape.lineTo((float)p1, (float)p2);
        }
        shape.closePath();
        return shape;
    }

/**
     * @treatAsPrivate implementation detail
     * @deprecated This is an internal API that is not intended for use and will be removed in the next version
     */
    @Deprecated
    public void impl_updatePeer() {
        super.impl_updatePeer();
        if (impl_isDirty(DirtyBits.NODE_GEOMETRY)) {
            final int numValidPoints = getPoints().size() & ~1;
            float points_array[] = new float[numValidPoints];
            for (int i = 0; i < numValidPoints; i++) {
                points_array[i] = (float)getPoints().get(i).doubleValue();
            }
            final NGPolygon peer = impl_getPeer();
            peer.updatePolygon(points_array);
        }
    }

/**
     * Returns a string representation of this {@code Polygon} object.
     * @return a string representation of this {@code Polygon} object.
     */
    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("Polygon[");

String id = getId();
        if (id != null) {
            sb.append("id=").append(id).append(", ");
        }

sb.append("points=").append(getPoints());

sb.append(", fill=").append(getFill());

Paint stroke = getStroke();
        if (stroke != null) {
            sb.append(", stroke=").append(stroke);
            sb.append(", strokeWidth=").append(getStrokeWidth());
        }

return sb.append("]").toString();
    }
}

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