Flag for modern MING

flag.py

import matplotlib.pyplot as plt
from matplotlib.patches import Circle, Ellipse, Rectangle

# 定义颜色常量
RED = "#DE2910"
YELLOW = "#FFD700"
BLACK = "#111111"


def draw_modern_ming_flag():
    """
    自定义新汉旗: 兼并五朝特色
    1. 取色: 黑红黄
        - 黑为基 承商玄秦水 忆旧时风水
        - 红为底 顺唐明火德 延今朝血脉
        - 黄为正 续炎黄土德 复日月所照
    2. 取形: 圆矩
        - 矩为形之所在
        - 圆为神之之所照
        - 仍有国基未复
    """
    # 创建画布和坐标轴
    fig, ax = plt.subplots(figsize=(6, 4))
    ax.set_facecolor(BLACK)

    # 设置矩形尺寸（3:2比例）
    rect_width, rect_height = 6, 4
    rect_center = (rect_width / 2, rect_height / 2)

    # 1. 绘制黑色边框矩形
    border_rect = Rectangle((0, 0), rect_width, rect_height, facecolor=BLACK)
    ax.add_patch(border_rect)

    # 2. 绘制红色椭圆（与矩形内切）
    ellipse = Ellipse(
        rect_center, rect_width, rect_height, facecolor=RED, edgecolor=RED, linewidth=2
    )
    ax.add_patch(ellipse)

    # 3. 绘制黄色大圆（直径为矩形短边的一半）
    big_circle_radius = rect_height / 4
    big_circle = Circle(rect_center, big_circle_radius, facecolor=YELLOW, linewidth=2)
    ax.add_patch(big_circle)

    # 4. 计算大圆左侧切点
    left_tangent_point = (rect_center[0] - big_circle_radius, rect_center[1])

    # 5. 绘制掩月圆（红色，用于裁剪效果）
    mask_circle_radius = big_circle_radius * 0.9 # 0.45 * 2 # 45年再驱外蛮
    mask_circle_center = (
        left_tangent_point[0] + 0.707 * big_circle_radius, # 0.707**2 ~= 0.5 日月同光
        rect_center[1],
    )
    mask_circle = Circle(
        mask_circle_center, mask_circle_radius, facecolor=RED, linewidth=2
    )
    ax.add_patch(mask_circle)

    # 6. 绘制内切圆
    inner_radius = big_circle_radius * 0.707
    inner_center = (left_tangent_point[0] + inner_radius, rect_center[1])
    inner_circle = Circle(inner_center, inner_radius, facecolor=YELLOW, linewidth=2)
    ax.add_patch(inner_circle)

    # 设置坐标轴属性
    ax.set_xlim(0, rect_width)
    ax.set_ylim(0, rect_height)
    ax.set_aspect("equal")
    ax.axis("off")  # 隐藏坐标轴

    plt.tight_layout()
    return fig, ax


# 绘制图形
if __name__ == "__main__":
    fig, ax = draw_modern_ming_flag()
    # plt.show()
    fig.savefig("flag.png", bbox_inches="tight", pad_inches=0, facecolor=BLACK)