code: def drawCurve(self, p1, p2, p3):
          
          kappa = 0.55228474983
          p1 = Point(p1)
          p2 = Point(p2)
          p3 = Point(p3)
          k1 = p1 + (p2 - p1) * kappa
          k2 = p3 + (p2 - p3) * kappa
          return self.drawBezier(p1, k1, k2, p3)
docs: Draw a curve between points using one control point.