public void setStartAngle(final double ANGLE) {
        if (null == startAngle) {
            _startAngle = clamp(0.0, 360.0, ANGLE);
            fireTileEvent(RECALC_EVENT);
        } else {
            if (!startAngle.isBound()) {
                startAngle.set(ANGLE);
            }
        }
    }
Defines the angle in degree that defines the start of the scale with
it's minValue in a radial tile. If set to 0 the scale will start at
the bottom center and the direction of counting is mathematical correct
counter-clockwise.
Means if you would like to start the scale on the left side in the
middle of the tile height the startAngle should be set to 270 degrees.

@param ANGLE
src/main/java/eu/hansolo/tilesfx/Tile.java