Cast varible type to int

NanoVNASaver/Charts/Smith.py

@@ -95,7 +95,7 @@ class SmithChart(SquareChart):
             if swr <= 1:
                 continue
             gamma = (swr - 1) / (swr + 1)
-            r = gamma * self.dim.width // 2
+            r = int(gamma * self.dim.width / 2)
             qp.drawEllipse(QtCore.QPoint(center_x, center_y), r, r)
             qp.drawText(
                 QtCore.QRect(center_x - 50, center_y - 4 + r, 100, 20),