__init__(self, points, **attr)
(Constructor)

Creates PolyMarker object
points - sequence (array, tuple or list) of (x,y) points
**attr - key word attributes
    Defaults:
        'colour'= 'black',          - wx.Pen Colour any wx.NamedColour
        'width'= 1,                 - Pen width
        'size'= 2,                  - Marker size
        'fillcolour'= same as colour,      - wx.Brush Colour any wx.NamedColour
        'fillstyle'= wx.SOLID,      - wx.Brush fill style (use wx.TRANSPARENT for no fill)
        'marker'= 'circle'          - Marker shape
        'legend'= ''                - Marker Legend to display
      
    Marker Shapes:
        - 'circle'
        - 'dot'
        - 'square'
        - 'triangle'
        - 'triangle_down'
        - 'cross'
        - 'plus'

Overrides:

wx.lib.plot.PolyPoints.__init__

getSymExtent(self, printerScale)

Width and Height of Marker