piesegment2d gl rendering && mov coords operation to dummy shape

Change-Id: Ic709fe37554cf29b4a644cabdc618c15959593d7
use a direct method for pie segment crastion

Change-Id: I4b42ebe994b4e498acd32d08a063e4626b3c97d8
remove unused variable

Change-Id: I07e45a42fc24d5b9169a9d5bc3b47e9d98d7163a