'''Created on 2023年4月7日@author: admin'''import reimport numpy as npimport matplotlib.pyplot as pltfrom matplotlib.path import Pathimport matplotlib.patches as patches# From:  = "M28.4,22.469c0.479-0.964,0.851-1.991,1.095-3.066c0.953-3.661,0.666-6.854,0.666-6.854l-0.327,2.104c0,0-0.469-3.896-1.044-5.353c-0.881-2.231-1.273-2.214-1.274-2.21c0.542,1.379,0.494,2.169,0.483,2.288c-0.01-0.016-0.019-0.032-0.027-0.047c-0.131-0.324-0.797-1.819-2.225-2.878c-2.502-2.481-5.943-4.014-9.745-4.015c-4.056,0-7.705,1.745-10.238,4.525C5.444,6.5,5.183,5.938,5.159,5.317c0,0-0.002,0.002-0.006,0.005c0-0.011-0.003-0.021-0.003-0.031c0,0-1.61,1.247-1.436,4.612c-0.299,0.574-0.56,1.172-0.777,1.791c-0.375,0.817-0.75,2.004-1.059,3.746c0,0,0.133-0.422,0.399-0.988c-0.064,0.482-0.103,0.971-0.116,1.467c-0.09,0.845-0.118,1.865-0.039,3.088c0,0,0.032-0.406,0.136-1.021c0.834,6.854,6.667,12.165,13.743,12.165l0,0c1.86,0,3.636-0.37,5.256-1.036C24.938,27.771,27.116,25.196,28.4,22.469zM16.002,3.356c2.446,0,4.73,0.68,6.68,1.86c-2.274-0.528-3.433-0.261-3.423-0.248c0.013,0.015,3.384,0.589,3.981,1.411c0,0-1.431,0-2.856,0.41c-0.065,0.019,5.242,0.663,6.327,5.966c0,0-0.582-1.213-1.301-1.42c0.473,1.439,0.351,4.17-0.1,5.528c-0.058,0.174-0.118-0.755-1.004-1.155c0.284,2.037-0.018,5.268-1.432,6.158c-0.109,0.07,0.887-3.189,0.201-1.93c-4.093,6.276-8.959,2.539-10.934,1.208c1.585,0.388,3.267,0.108,4.242-0.559c0.982-0.672,1.564-1.162,2.087-1.047c0.522,0.117,0.87-0.407,0.464-0.872c-0.405-0.466-1.392-1.105-2.725-0.757c-0.94,0.247-2.107,1.287-3.886,0.233c-1.518-0.899-1.507-1.63-1.507-2.095c0-0.366,0.257-0.88,0.734-1.028c0.58,0.062,1.044,0.214,1.537,0.466c0.005-0.135,0.006-0.315-0.001-0.519c0.039-0.077,0.015-0.311-0.047-0.596c-0.036-0.287-0.097-0.582-0.19-0.851c0.01-0.002,0.017-0.007,0.021-0.021c0.076-0.344,2.147-1.544,2.299-1.659c0.153-0.114,0.55-0.378,0.506-1.183c-0.015-0.265-0.058-0.294-2.232-0.286c-0.917,0.003-1.425-0.894-1.589-1.245c0.222-1.231,0.863-2.11,1.919-2.704c0.02-0.011,0.015-0.021-0.008-0.027c0.219-0.127-2.524-0.006-3.76,1.604C9.674,8.045,9.219,7.95,8.71,7.95c-0.638,0-1.139,0.07-1.603,0.187c-0.05,0.013-0.122,0.011-0.208-0.001C6.769,8.04,6.575,7.88,6.365,7.672c0.161-0.18,0.324-0.356,0.495-0.526C9.201,4.804,12.43,3.357,16.002,3.356z" # noqadef svg_parse(path):          commands = {'M': (Path.MOVETO,),          'L': (Path.LINETO,),          'Q': (Path.CURVE3,)*2,          'C': (Path.CURVE4,)*3,          'Z': (Path.CLOSEPOLY,)}          vertices = []          codes = []          cmd_values = re.split("([A-Za-z])", path)[1:] # Split over commands.          for cmd, values in zip(cmd_values[::2], cmd_values[1::2]):          # Numbers are separated either by commas, or by +/- signs (but not at          # the beginning of the string).          points = ([*map(float, re.split(",|(?<!^)(?=[+-])", values))] if values          else [(0., 0.)]) # Only for "z/Z" (CLOSEPOLY).          points = np.reshape(points, (-1, 2))          if cmd.islower():          points += vertices[-1][-1]          codes.extend(commands[cmd.upper()])          vertices.append(points)          return np.array(codes), np.concatenate(vertices)codes, verts = svg_parse(firefox)path = Path(verts, codes)xmin, ymin = verts.min(axis=0) - 1xmax, ymax = verts.max(axis=0) + 1fig = plt.figure(figsize=(5, 5), facecolor="0.75") # gray backgroundax = fig.add_axes([0, 0, 1, 1], frameon=False, aspect=1,xlim=(xmin, xmax), # centeringylim=(ymax, ymin), # centering, upside downxticks=[], yticks=[]) # no ticks# White outline (width = 6)ax.add_patch(patches.PathPatch(path, facecolor='none', edgecolor='w', lw=6)) ax.add_patch(patches.PathPatch(path, facecolor='orange', edgecolor='k', lw=2))plt.show() # Display

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Matplotlib中折线处理的主要类是 Path . 几乎所有的矢量图都利用了 Path 在绘制管道的某个地方

当一个 Path 无法绘制实例本身，一些 Artist 子类，例如 PathPatch 和 PathCollection ，方便使用 Path 形象化。

class matplotlib.path.Path(vertices, codes=None, _interpolation_steps=1, closed=False, readonly=False)[源代码]

基类：object

一系列可能断开、可能闭合的直线段和曲线段。

底层存储由两个并行的numpy数组组成：

顶点 ：nx2浮点顶点数组代码 ：顶点类型的N长度uint8数组，或无

这两个数组在第一维中的长度总是相同的。例如，要表示三次曲线，必须提供三个顶点和三个代码 CURVE3 .

代码类型为：

STOP1顶点（忽略）整个路径结尾的标记（当前不需要和忽略）MOVETO1顶点拿起笔，移动到给定的顶点。LINETO1顶点从当前位置到给定顶点画一条线。CURVE31个控制点，1个端点从给定控制点的当前位置到给定终点绘制二次贝塞尔曲线。CURVE42个控制点，1个端点用给定的控制点从当前位置到给定的终点绘制一条三次贝塞尔曲线。CLOSEPOLY1顶点（忽略）绘制一条直线段到当前多段线的起点。

如果 代码 为“无”，则将其解释为 MOVETO 然后是一系列 LINETO .

路径对象的用户不应直接访问顶点和代码数组。相反，他们应该使用 iter_segments 或 cleaned 获取顶点/代码对。这尤其有助于始终如一地处理 代码 没有。

路径对象的某些行为可以由rcParams控制。请参阅其键以“path”开头的rcParams。

代码中的 vertices其实是顶角的意思

最后沿着指定的路径 绘制图形。