5 code 4.py 文件源码

def show_results(self):
        font = {'family': 'serif',
                'color':  'k',
                'weight': 'normal',
                'size': 12,
        }
        pl.plot(self.x, self.y, 'c', label='firing angle = 45°')
        pl.title('The Trajectory of a Cannon Shell', fontdict = font)
        pl.xlabel('x (k$m$)')
        pl.ylabel('y ($km$)')
        pl.xlim(0, 60)
        pl.ylim(0, 20)
        pl.grid(True)
        pl.legend(loc='upper right', shadow=True, fontsize='large')
        pl.text(34.5, 16, '      With air drag and the \n dependence of g on altitude', fontdict = font)
        pl.show()