plt动态绘图

API

• plt.ion()：开启交互模式
• plt.ioff()：关闭交互模式
• plt.clf()：清理残留图像
• plt.pause()：暂停

例子

import matplotlib.pyplot as plt

plt.ion()
x = []
y = []
for i in range(100):
    x.append(i)
    y.append(i ** 2)
    plt.clf()
    plt.plot(x, y)
    plt.pause(0.1)
    plt.ioff()

范围限制

import matplotlib.pyplot as plt


def draw_func(draw_count=None):
    data = []
    plt.ion()

    def __draw(_data, keep=False):
        data.append(_data)
        length = len(data)
        start = 0
        if (draw_count is not None) and isinstance(draw_count, int) and (draw_count < length):
            draw_data = data[-draw_count:]
            start = length - draw_count
        else:
            draw_data = data

        idx = [x for x in range(start, length)]
        plt.clf()
        plt.plot(idx, draw_data)
        plt.pause(0.1)
        if keep:
            plt.show()
        else:
            plt.ioff()
    return __draw


if __name__ == '__main__':
    draw = draw_func(30)
    for i in range(100):
        draw(i ** 2, i == 99)