Patch [ 1816051 ] MSW DrawEllipticArc inconsistent with other platforms

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@49338 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/dc.cpp

@@ -1123,6 +1123,17 @@ void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,d
     rx2 += (int)(100.0 * abs(w) * cos(ea));
     ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea));
 
+    // Swap start and end positions if the end angle is less than the start angle.
+    if (ea < sa) {
+	int temp;
+	temp = rx2;
+	rx2 = rx1;
+	rx1 = temp;
+	temp = ry2;
+	ry2 = ry1;
+	ry1 = temp;
+    }
+
     // draw pie with NULL_PEN first and then outline otherwise a line is
     // drawn from the start and end points to the centre
     HPEN hpenOld = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));