improve pie segment rendering

Change-Id: I57c213420718f2be338b94459c6273fbfcb32881

chart2/source/view/main/DummyXShape.cxx

@@ -364,7 +364,8 @@ void DummyPieSegment2D::render()
     */
 
     float nSize = std::max<float>(maUnitCircleToScene.Line1.Column1, maUnitCircleToScene.Line2.Column2);
-    pChart->m_GLRender.RenderPieSegment2DShape(nSize, maUnitCircleToScene.Line1.Column4, maUnitCircleToScene.Line2.Column4);
+    pChart->m_GLRender.RenderPieSegment2DShape(nSize, maUnitCircleToScene.Line1.Column4 + maOffset.DirectionX,
+            maUnitCircleToScene.Line2.Column4 + maOffset.DirectionY);
 
 }
 

chart2/source/view/main/OpenGLRender.cxx

@@ -1737,6 +1737,7 @@ void OpenGLRender::GeneratePieSegment2D(double fInnerRadius, double fOutterRadiu
     if(bInnerRadiusNotZero)
         nVectorSize *= 2;
 
+    nAngleStart += 90;
     aPointList.reserve(nVectorSize);
     // if inner radius = 0 generate a normal pie segment (triangle fan)
     // if inner radius != 0 generate a pie segment - inner pie (triangle strip)