private void resize() {
        width  = getWidth() - getInsets().getLeft() - getInsets().getRight();
        height = getHeight() - getInsets().getTop() - getInsets().getBottom();
        size   = width < height ? width : height;

        if (width > 0 && height > 0) {
            pane.setMaxSize(size, size);
            pane.setPrefSize(size, size);
            pane.relocate((getWidth() - size) * 0.5, (getHeight() - size) * 0.5);

            segmentPane.setPrefSize(size, size);

            chartCanvas.setWidth(size);
            chartCanvas.setHeight(size);

            centerX = size * 0.5;
            centerY = centerX;

            redraw();
        }
    }
Defines the root element of the tree
@param TREE
src/main/java/eu/hansolo/tilesfx/chart/SunburstChart.java