Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\geom\RoundRectIterator.java

/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.javafx.geom;

import java.util.NoSuchElementException;

import com.sun.javafx.geom.transform.BaseTransform;

/**
 * A utility class to iterate over the path segments of an rounded rectangle
 * through the PathIterator interface.
 *
 * @version 10 Feb 1997
 */
class RoundRectIterator implements PathIterator {
    double x, y, w, h, aw, ah;
    BaseTransform transform;
    int index;

RoundRectIterator(RoundRectangle2D rr, BaseTransform tx) {
        this.x = rr.x;
        this.y = rr.y;
        this.w = rr.width;
        this.h = rr.height;
        this.aw = Math.min(w, Math.abs(rr.arcWidth));
        this.ah = Math.min(h, Math.abs(rr.arcHeight));
        this.transform = tx;
        if (aw < 0 || ah < 0) {
            // Don't draw anything...
            index = ctrlpts.length;
        }
    }

/**
     * Return the winding rule for determining the insideness of the
     * path.
     * @see #WIND_EVEN_ODD
     * @see #WIND_NON_ZERO
     */
    public int getWindingRule() {
        return WIND_NON_ZERO;
    }

/**
     * Tests if there are more points to read.
     * @return true if there are more points to read
     */
    public boolean isDone() {
        return index >= ctrlpts.length;
    }

/**
     * Moves the iterator to the next segment of the path forwards
     * along the primary direction of traversal as long as there are
     * more points in that direction.
     */
    public void next() {
        ++index;
        if (index < ctrlpts.length &&
            aw == 0 && ah == 0 &&
            types[index] == SEG_CUBICTO)
        {
            // skip empty CUBIC segments
            index++;
        }
    }

private static final double angle = Math.PI / 4.0;
    private static final double a = 1.0 - Math.cos(angle);
    private static final double b = Math.tan(angle);
    private static final double c = Math.sqrt(1.0 + b * b) - 1 + a;
    private static final double cv = 4.0 / 3.0 * a * b / c;
    private static final double acv = (1.0 - cv) / 2.0;

// For each array:
    //     4 values for each point {v0, v1, v2, v3}:
    //         point = (x + v0 * w + v1 * arcWidth,
    //                  y + v2 * h + v3 * arcHeight);
    private static final double ctrlpts[][] = {
        {  0.0,  0.0,  0.0,  0.5 },
        {  0.0,  0.0,  1.0, -0.5 },
        {  0.0,  0.0,  1.0, -acv,
           0.0,  acv,  1.0,  0.0,
           0.0,  0.5,  1.0,  0.0 },
        {  1.0, -0.5,  1.0,  0.0 },
        {  1.0, -acv,  1.0,  0.0,
           1.0,  0.0,  1.0, -acv,
           1.0,  0.0,  1.0, -0.5 },
        {  1.0,  0.0,  0.0,  0.5 },
        {  1.0,  0.0,  0.0,  acv,
           1.0, -acv,  0.0,  0.0,
           1.0, -0.5,  0.0,  0.0 },
        {  0.0,  0.5,  0.0,  0.0 },
        {  0.0,  acv,  0.0,  0.0,
           0.0,  0.0,  0.0,  acv,
           0.0,  0.0,  0.0,  0.5 },
        {},
    };

private static final int types[] = {
        SEG_MOVETO,
        SEG_LINETO, SEG_CUBICTO,
        SEG_LINETO, SEG_CUBICTO,
        SEG_LINETO, SEG_CUBICTO,
        SEG_LINETO, SEG_CUBICTO,
        SEG_CLOSE,
    };

/**
     * Returns the coordinates and type of the current path segment in
     * the iteration.
     * The return value is the path segment type:
     * SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
     * A float array of length 6 must be passed in and may be used to
     * store the coordinates of the point(s).
     * Each point is stored as a pair of float x,y coordinates.
     * SEG_MOVETO and SEG_LINETO types will return one point,
     * SEG_QUADTO will return two points,
     * SEG_CUBICTO will return 3 points
     * and SEG_CLOSE will not return any points.
     * @see #SEG_MOVETO
     * @see #SEG_LINETO
     * @see #SEG_QUADTO
     * @see #SEG_CUBICTO
     * @see #SEG_CLOSE
     */
    public int currentSegment(float[] coords) {
        if (isDone()) {
            throw new NoSuchElementException("roundrect iterator out of bounds");
        }
        double ctrls[] = ctrlpts[index];
        int nc = 0;
        for (int i = 0; i < ctrls.length; i += 4) {
            coords[nc++] = (float) (x + ctrls[i + 0] * w + ctrls[i + 1] * aw);
            coords[nc++] = (float) (y + ctrls[i + 2] * h + ctrls[i + 3] * ah);
        }
        if (transform != null) {
            transform.transform(coords, 0, coords, 0, nc / 2);
        }
        return types[index];
    }
}

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