def plot(self):

    import numpy as np
    from matplotlib import pyplot as plt

    fig = plt.figure()
    ax = fig.add_subplot(111)
    # plot triangle
    ax.plot(np.hstack((self.v[:, 0], self.v[0, 0])),
            np.hstack((self.v[:, 1], self.v[0, 1])),
            'k-', label='Triangle')
    ax.axis('equal')
    ax.grid(ls='--', lw=0.6)
    ax.legend()
    return ax

def plot(self):

    from matplotlib import pyplot as plt
    import numpy as np

    alpha = np.linspace(0, 2 * np.pi, 1000)
    self.x = self.center[0] + self.radius * np.cos(alpha)
    self.y = self.center[1] + self.radius * np.sin(alpha)
    fig = plt.figure()
    ax = fig.add_subplot(111)
    # plot circle
    ax.plot(self.x, self.y, 'r-', label='Circle')
    ax.axis('equal')
    ax.grid(ls='--', lw=0.6)
    ax.legend()
    return ax

def plotintrianglecircle(self):


    from matplotlib import pyplot as plt

    c = Circle(self.center, self.radius)
    fig1 = c.plot()
    fig2 = self.plot()
    plt.plot(fig1)
    plt.hold(True)
    plt.plot(fig2)

    return