Python绘画蓝色填充粉色框的箭头

在Python中，可以使用matplotlib库来进行绘图，包括添加填充颜色和绘制箭头。首先，你需要安装matplotlib，如果还没有安装，可以使用pip install matplotlib命令。

为了创建一个蓝色填充的粉色框，并在其内部画出箭头，你可以这样做：

import matplotlib.pyplot as plt
from matplotlib.patches import Rectangle
from matplotlib.path import Path
from matplotlib.projections import register_projection
from mpl_toolkits.axes_grid1.inset_locator import zoomed_inset_axes

# 创建自定义投影
class ArrowRectangle(Axes):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.ax = self.figure.add_subplot(axes_class=self)

    def fill_between(self, x, y, facecolor='blue', alpha=0.5):
        path = Path(zip(x, y))
        patch = PathPatch(path, facecolor=facecolor, alpha=alpha)
        self.add_patch(patch)

    def draw_arrow(self, start, end, color='pink'):
        ax = self.figure.add_subplot(axes_class=Axes)
        ax.arrow(start[0], start[1], end[0] - start[0], end[1] - start[1], head_width=0.1, length_includes_head=True, color=color)

register_projection(ArrowRectangle)

# 使用自定义箭头矩形
fig = plt.figure()
ax = fig.add_subplot(projection=ArrowRectangle)
x = [0, 1, 1, 0, 0]
y = [0, 0, 1, 1, 0]
ax.fill_between(x, y, facecolor='blue')
start = (0.3, 0.4)
end = (0.7, 0.6)
ax.draw_arrow(start, end, color='pink')

# 显示图形
plt.show()