RectIterator(Rectangle2D r,
    AffineTransform at) 
{
        this.x = r.getX();
        this.y = r.getY();
        this.w = r.getWidth();
        this.h = r.getHeight();
        this.affine = at;
        if (w <  0 || h <  0) {
            index = 6;
        }
}

 public int currentSegment(float[] coords) 
{
        if (isDone()) {
            throw new NoSuchElementException("rect iterator out of bounds");
        }
        if (index == 5) {
            return SEG_CLOSE;
        }
        coords[0] = (float) x;
        coords[1] = (float) y;
        if (index == 1 || index == 2) {
            coords[0] += (float) w;
        }
        if (index == 2 || index == 3) {
            coords[1] += (float) h;
        }
        if (affine != null) {
            affine.transform(coords, 0, coords, 0, 1);
        }
        return (index == 0 ? SEG_MOVETO : SEG_LINETO);
}

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.

 public int currentSegment(double[] coords) 
{
        if (isDone()) {
            throw new NoSuchElementException("rect iterator out of bounds");
        }
        if (index == 5) {
            return SEG_CLOSE;
        }
        coords[0] = x;
        coords[1] = y;
        if (index == 1 || index == 2) {
            coords[0] += w;
        }
        if (index == 2 || index == 3) {
            coords[1] += h;
        }
        if (affine != null) {
            affine.transform(coords, 0, coords, 0, 1);
        }
        return (index == 0 ? SEG_MOVETO : SEG_LINETO);
}

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 double 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 double 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.

 public int getWindingRule() 
{
        return WIND_NON_ZERO;
}

Return the winding rule for determining the insideness of the path.

 public boolean isDone() 
{
        return index  > 5;
}

Tests if there are more points to read.

 public  void next() 
{
        index++;
}

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.