使用`savefig'時，缺少`matplotlib.imshow`在PDF中插入的圖像

Question

我正在嘗試插入圖像來注釋這樣的圖形：

from matplotlib import offsetbox
from matplotlib import pyplot as plt
from matplotlib import rcParams

rcParams["figure.dpi"] = 200
rcParams["figure.figsize"] = 4,3
alphaEndo = pd.read_csv('../data/UNIT_VOL_FRACTION.ENDO_DODECAHEDRON.csv', comment="#")

fig, ax = plt.subplots()
ax.grid(False)

ax.set_ylabel("$\\alpha_c(s)$")
ax.set_xlabel("$s$")

colors = plt.rcParams['axes.prop_cycle'].by_key()['color']

def plot_polyhedron(N, xScale, yScale, ax):
    img = plt.imread("../data/UNIT_VOL_ENDO_DODECAHEDRON_IMAGES/UNIT_VOL_ENDO_DODECAHEDRON.%04d.png" % N) 
    img = offsetbox.OffsetImage(img, zoom=0.07)
    img.image.axes = ax
    ab = offsetbox.AnnotationBbox(img, xy=(alphaEndo['S'].loc[N], alphaEndo['ALPHA_STAR'].loc[N]),
                                  xybox=(xScale*alphaEndo['S'].loc[N], yScale*alphaEndo['ALPHA_STAR'].loc[N]),
                                  frameon=False, arrowprops=dict(arrowstyle="Simple",facecolor=colors[0]),pad=False)
    ax.add_artist(ab)      

plot_polyhedron(5, 2, 0.6, ax)
plot_polyhedron(50,0.65, 0.35, ax)
plot_polyhedron(95, 0.7, 3, ax)
ax.plot(alphaEndo['S'], alphaEndo['ALPHA_STAR'], lw=2)


figBaseName = "ENDO_DODECAHEDRON_ALPHA_S"
fig.savefig(figBaseName + ".png")
fig.savefig(figBaseName + ".pdf")

if "GEOP" in os.environ:
    pathName = os.path.join(os.environ["GEOP"], "figures", figBaseName)
    fig.savefig(pathName + ".png")
    fig.savefig(pathName + ".pdf")

對於PNG文件，我得到以下信息：

但在PDF中，缺少多面體的小圖像：

我發現了有關丟失圖像的問題 ，但是對於我的情況，答案並沒有真正幫助，因為我沒有在“ plt.savefig（）”之前顯式調用“ plt.show（）”，而是使用軸。 該代碼來自Jupyter筆記本單元。

Answer 1

請嘗試以下修改：

def plot_polyhedron(N, xScale, yScale, ax):
    img = plt.imread("../data/UNIT_VOL_ENDO_DODECAHEDRON_IMAGES/UNIT_VOL_ENDO_DODECAHEDRON.%04d.png" % N) 
    imagebox = offsetbox.OffsetImage(img, zoom=0.07)
    imagebox.image.axes = ax
    ab = offsetbox.AnnotationBbox(imagebox, xy=(alphaEndo['S'].loc[N], alphaEndo['ALPHA_STAR'].loc[N]),
                                  xybox=(xScale*alphaEndo['S'].loc[N], yScale*alphaEndo['ALPHA_STAR'].loc[N]),
                                  frameon=False, arrowprops=dict(arrowstyle="Simple",facecolor=colors[0]),pad=False)
    ax.add_artist(ab)