you use the methods of
http://www.blackberry.com/developers/docs/7.1.0api/net/rim/device/api/ui/Graphics.htmla simple way to get a graphcis object is to either overwrite paint on a field/screen or calling create on a previously initialized bitmap.
to draw a line you could usw drawLine, for example drawLine(1,1,10,1) would draw a line from position 1/1 to 10/1
you can search for the method name of more advanced methods to find sample usescases, like drawTexturedPath
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