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小彭老师您好!我的改动是增加了draw_logo()和draw_logo_element()函数,其中draw_logo()计算每个圈圈的圆心(用于指定每个圈圈的位置)和校正角度(用于确保每个圈圈都从缺口正上方开始画)和颜色,draw_logo_element()根据参数画出指定圈圈。请您批阅,谢谢!