Python matplotlib生成圖片背景透明的示例程式碼
阿新 • • 發佈:2020-01-09
使用matplotlib生成圖片,想要背景透明,而且圖例部分也顯示透明效果,找到了大概的設定方法,特此記錄。
# coding=utf-8 # matplotlib背景透明示例圖 # python 3.5 import numpy as np import matplotlib.pyplot as plt from pylab import mpl import scipy.stats as stats # 設定中文字型 mpl.rcParams['font.sans-serif'] = ['SimHei'] def autolabel(rects): # attach some text labels for rect in rects: height = rect.get_height() # 設定標註文字及位置 ax.text(rect.get_x() + rect.get_width() / 2,0.03 + height,'%.4f' % height,ha='center',va='bottom') # 資料 testData = [[0.87,0.40,0.56],[0.97,0.50,0.33],[0.88,0.30,0.44],[0.25,0.23,0.17],[0.73,0.33,0.45]] N = 3 width = 0.5 ind = np.arange(width,width*6*N,width*6) fig,ax = plt.subplots() rectsTest1 = ax.bar(ind,(testData[0][0],testData[0][1],testData[0][2]),width,color=(0,1,1),edgecolor=(0,1)) rectsTest2 = ax.bar(ind + width,(testData[1][0],testData[1][1],testData[1][2]),color=(1,edgecolor=(1,1)) rectsTest3 = ax.bar(ind + 2*width,(testData[2][0],testData[2][1],testData[2][2]),1)) rectsTest4 = ax.bar(ind + 3*width,(testData[3][0],testData[3][1],testData[3][2]),0.6471,1)) rectsTest5 = ax.bar(ind + 4*width,(testData[4][0],testData[4][1],testData[4][2]),color=(0.5804,0.8275,edgecolor=(0.5804,1)) ax.set_xlim(0,9.5) ax.set_ylim(0,1.4) ax.set_ylabel('數值') ax.yaxis.grid(True) ax.set_xticks(ind + width * 2.5) ax.set_xticklabels(('P','R','F')) # 設定圖例 legend = ax.legend((rectsTest1,rectsTest2,rectsTest3,rectsTest4,rectsTest5),('test1','test2','test3','test4','test5')) frame = legend.get_frame() frame.set_alpha(1) frame.set_facecolor('none') # 設定圖例legend背景透明 # 給每個資料矩形標註數值 autolabel(rectsTest1) autolabel(rectsTest2) autolabel(rectsTest3) autolabel(rectsTest4) autolabel(rectsTest5) plt.savefig('C:/Users/XX/Desktop/test.png',format='png',bbox_inches='tight',transparent=True,dpi=600) # bbox_inches='tight' 圖片邊界空白緊緻,背景透明 效
效果可能在網頁上看不出來,但還是把圖片貼上來吧。
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