René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Bug when saving to vector format (pdf, svg, eps)","articleBody":"There is a discrepancy between vector format (pdf, svg, eps) output and image output (png, jpg, etc) for the BboxImage object. I can't attach a pdf, but the this code creates and saves a pdf and png illustrating the BboxImage object translation. Just update the save folder path to run the code.\n\nThanks and let me know if I should include anything else.\n\n```\n'''\nMinimum working example\nversion 1.3.1\nPlots a descriptive flowchart showing error\n@Author: wronk\n'''\n\nfrom os import path as op\nimport numpy as np\nimport matplotlib as mpl\nimport matplotlib.pyplot as plt\nfrom matplotlib.image import BboxImage\nfrom matplotlib.offsetbox import TextArea, AnnotationBbox\nfrom matplotlib.transforms import Bbox\nfrom mpl_toolkits.axes_grid1 import make_axes_locatable\nfrom matplotlib.backends.backend_pdf import PdfPages\n\n###############################################################################\n#EDIT SAVE FOLDER TO AUTOSAVE\nsaveFig = True\nsave_fname = '/home/wronk/'\n\nmpl.rcParams['mathtext.default'] = 'rm'\n\n#Box properties\nbboxProp = dict(boxstyle='round,pad=0.3', fill=False, ec='w', linewidth=8)\n\n#Colors for annotation arrows\nsenCol = (0.35, 0.35, 0.35)\nsrcCol = (.8, .216, 0.0)\n\n#Define color map\ncm = 'autumn'\ncolRange = np.atleast_2d(np.arange(256)/256.)\n\n###############################################################################\n#Initialize Plot\nplt.ion()\nplt.close('all')\nmpl.rcParams['pdf.fonttype'] = 42\n\nfigSize = (12, 6)\nftSize = 32\ndpi = 80\nrowYVals = [0.085, 0.55, 0.85]\nrowXVals = [0, .075, .2, .34, .5, .65, .8, .875]\n\nfig = plt.figure(figsize=figSize, facecolor='white', dpi=dpi)\n#fig = plt.figure(figsize=figSize, facecolor='white')\n#ax = fig.gca()\nax = plt.subplot(111)\n\n###############################################################################\n#Mid level of annotation boxes\n#Text for boxes in mathematical font\nflowMid = r'$j_{N-1}$'\n\nmidBox3 = ax.annotate(flowMid, xy=(0, .5), xycoords='axes fraction',\n                      xytext=(rowXVals[3], rowYVals[1]),\n                      textcoords='axes fraction',\n                      size=ftSize, ha='left', va='center', bbox=bboxProp,\n                      arrowprops=None, color='black')\n\n#######################################\n#HEREIN LIES THE PROBLEM\n#Add color (gradients) behind the boxes\n\n#Something about the bbox window extent property must get shifted when saving\n#as a vector format (pdf, svg, eps) but not common image types. In my experience,\n#every bboximage was translated and scaled uniformly.\n\n#I tried changing DPI, image size, subplot parameters as well as sychronizing\n#plotting and saving figures in matplotlibrc to no avail. DPI does seem to\n#have some sort of effect in terms of how the bboximage gets shifted though.\n\ngradient = BboxImage(midBox3.get_bbox_patch().get_window_extent,\n                     data=np.zeros_like(colRange), cmap=cm, norm=None,\n                     origin=None)\nax.add_artist(gradient)\n\n#######################################\nplt.draw()\n\n#Save figure as pdf and png to highlight difference\n#Same results when saving from GUI window\nif saveFig:\n    pdfFile = PdfPages(save_fname + 'flowchart_PDF.pdf')\n    plt.savefig(pdfFile, format='pdf', dpi=fig.dpi)\n    pdfFile.close()\n    plt.savefig(save_fname + 'flowchart_PNG.png', dpi=fig.dpi)\nplt.show()\n```\n\n(tacaswell edited for code markup)\n","author":{"url":"https://github.com/wronk","@type":"Person","name":"wronk"},"datePublished":"2014-02-21T21:20:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":25},"url":"https://github.com/2831/matplotlib/issues/2831"}