ENTROID_RADIUS = 10,
        CENTROID_STROKE_STYLE = 'rgba(0, 0, 0, 0.8)',
        CENTROID_FILL_STYLE ='rgba(255, 255, 255, 0.2)',
        CENTROID_SHADOW_COLOR = 'rgba(255, 255, 255, 0.4)',

        DEGREE_RING_MARGIN = 35,
        TRACKING_RING_MARGIN = 55,
        DEGREE_ANNOTATIONS_FILL_STYLE = 'rgba(0, 0, 230, 0.8)',
        DEGREE_ANNOTATIONS_TEXT_SIZE = 11,
        DEGREE_OUTER_RING_MARGIN = DEGREE_RING_MARGIN,
        TICK_WIDTH = 10,
        TICK_LONG_STROKE_STYLE = 'rgba(100, 140, 230, 0.9)',
   