René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Border issues when exporting images on version \u003e3.0.3","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nWe noticed weird border issues after upgrading `matplotlib` from `3.0.3` to higher versions. I tried searching through the open issues but I couldn't find a matching one. I also tried looking through the changelog for `3.1.0` but nothing stood out.\r\n\r\n**Code for reproduction**\r\n\r\nThis is a bit simplified version of what we're doing on production:\r\n\r\n```python\r\nimport io\r\n\r\nfrom matplotlib.figure import Figure\r\nfrom matplotlib.patches import Arc, Rectangle\r\nfrom matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas\r\n\r\ngraph_path = \"/tmp/foobar.png\"\r\n\r\nPITCH_WIDTH = 65\r\nPITCH_LENGTH = 105\r\nPITCH_SCALE = 8\r\n\r\n# Create example pitch graph\r\nfig = Figure(figsize=(PITCH_WIDTH / PITCH_SCALE, PITCH_LENGTH / PITCH_SCALE))\r\nax = fig.subplots()\r\nax.set_facecolor(\"#1e1e1e\")\r\n\r\nax.set_xlim(0, PITCH_WIDTH)\r\nax.set_ylim(0, PITCH_LENGTH)\r\n\r\npitch_borders = Rectangle(\r\n    (0, 0),\r\n    width=PITCH_WIDTH,\r\n    height=PITCH_LENGTH,\r\n    color=\"#ffffff\",\r\n    fill=False,\r\n    lw=2,\r\n    zorder=10,\r\n)\r\nax.add_patch(pitch_borders)\r\n\r\nhalfway_line = Rectangle(\r\n    (0, PITCH_LENGTH / 2),\r\n    width=PITCH_WIDTH,\r\n    height=0,\r\n    color=\"#ffffff\",\r\n    fill=False,\r\n    lw=2,\r\n    zorder=0,\r\n)\r\nax.add_patch(halfway_line)\r\n\r\ncentre_circle = Arc(\r\n    (PITCH_WIDTH / 2, PITCH_LENGTH / 2),\r\n    width=18,\r\n    height=18,\r\n    color=\"#ffffff\",\r\n    theta1=0,\r\n    theta2=360,\r\n    lw=2,\r\n    zorder=0,\r\n)\r\nax.add_patch(centre_circle)\r\n\r\nax.get_xaxis().set_visible(False)\r\nax.get_yaxis().set_visible(False)\r\n\r\n# Export it to bytes buffer\r\nbuffer = io.BytesIO()\r\ncanvas = FigureCanvas(fig)\r\ncanvas.print_figure(buffer, dpi=150, bbox_inches=\"tight\", pad_inches=0)\r\nbuffer.seek(0)\r\n\r\n# Save buffer to a file\r\nwith open(graph_path, \"wb\") as f:\r\n    f.write(buffer.getvalue())\r\n```\r\n\r\n**Actual outcome**\r\n\r\nOn versions newer then `3.0.3` you can see weird borders on left and bottom side.\r\n\r\nOn version `3.1.3`:\r\n![pitch_v313](https://user-images.githubusercontent.com/7062874/78035923-fbb62500-7369-11ea-8076-46e30c0058df.png)\r\n\r\nOn version `3.2.1`:\r\n![pitch_v321](https://user-images.githubusercontent.com/7062874/78035939-02449c80-736a-11ea-941b-44c71d6b7ae0.png)\r\n\r\n**Expected outcome**\r\n\r\nOn version `3.0.3` it works as expected, without the weird borders:\r\n![pitch_v303](https://user-images.githubusercontent.com/7062874/78035966-0a9cd780-736a-11ea-8c11-7438b1645c80.png)\r\n\r\nWe're not sure if it's something we're doing wrong (so a fix for `matplotlib` was a regression for us) or is there a bigger bug there.\r\n\r\n**Matplotlib version**\r\n  * Operating system: OS X 10.14.6\r\n  * Matplotlib version: 3.2.1 (and 3.1.3)\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): this returns `TkAgg`, but we explicitly use `Agg` via. `FigureCanvasAgg`\r\n  * Python version: 3.7.7\r\n  * Jupyter version (if applicable): n/a\r\n  * Other libraries: n/a\r\n\r\nPython installed via pyenv, matplotlib installed via pip inside a virtualenv. No other extra libraries.","author":{"url":"https://github.com/pawelad","@type":"Person","name":"pawelad"},"datePublished":"2020-03-31T14:14:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":14},"url":"https://github.com/16981/matplotlib/issues/16981"}