René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"fig.savefig alters the dimensions of the figure","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\nfig.savefig(...) changes the size of the figure it is trying to save to file \r\nminor note: problem doesn't occur when size_figure_inches\u003c=5\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport numpy as np\r\nimport matplotlib\r\nimport matplotlib.pyplot as plt\r\n\r\nFORCE_RESIZE_WINDOW = False\r\n\r\nclass Figure:\r\n  size_figure_inches = 10.0 #\u003c size of full figure\r\n  size_world_half = 5 #\u003c size of world (centered 0)\r\n\r\n  def __init__(self, fid):\r\n    self.fig = plt.figure(fid)\r\n    self.canvas = self.fig.canvas\r\n\r\n    #--- specify figure\r\n    sfi = self.size_figure_inches\r\n    self.fig.set_size_inches(sfi, sfi)\r\n    self.fig.set_dpi(100)\r\n\r\n    # --- specify axis\r\n    self.ax = self.fig.add_axes([0, 0, 1, 1])  # \u003c (full image)\r\n    self.cla()\r\n\r\n  def cla(self):\r\n    if FORCE_RESIZE_WINDOW:\r\n      sfi = self.size_figure_inches\r\n      self.fig.set_size_inches(sfi, sfi)\r\n      self.fig.set_dpi(100)\r\n\r\n    # --- clear axis (resets limits)\r\n    plt.cla()\r\n    # --- set limits\r\n    swh = self.size_world_half\r\n    self.ax.set_ylim(-swh, +swh)\r\n    self.ax.set_xlim(-swh, +swh)\r\n\r\n    #--- setup grid\r\n    self.ax.set_xticks(range(-swh, +swh))\r\n    self.ax.set_yticks(range(-swh, +swh))\r\n    self.ax.grid(color='k')\r\n    self.ax.grid(True)\r\n\r\n  def plot2(self, P):\r\n    x = P[:, 0]\r\n    y = P[:, 1]\r\n    self.ax.plot(x, y)\r\n\r\n#------------------------------------------------------------------------------------------\r\n\r\nt = np.arange(0.0, 2.0, 0.01)\r\ns = 1 + np.sin(2*np.pi*t)\r\nx = np.cos(2*np.pi*t)\r\ny = np.sin(2*np.pi*t)\r\nM_restpose = np.vstack([x,y]).transpose()\r\n\r\nprint(\"backend: \", matplotlib.get_backend() )\r\n\r\nfig = Figure(1)\r\noffs = np.arange(-1, +1, .25)\r\nfor i, off in enumerate(offs):\r\n  fig.cla()\r\n  fig.plot2(M_restpose)\r\n  fig.fig.savefig(\"./test%d.png\" % i)\r\n  plt.pause(.1)\r\n  print(\"Figure size for test%d \" % i, fig.fig.get_size_inches())\r\n```\r\n\r\n**Actual outcome**\r\n\r\n```\r\nbackend:  TkAgg\r\nFigure size for test0  [10.    9.66]\r\nFigure size for test1  [10.    9.32]\r\nFigure size for test2  [10.    8.98]\r\nFigure size for test3  [10.    8.64]\r\nFigure size for test4  [10.   8.3]\r\nFigure size for test5  [10.    7.96]\r\nFigure size for test6  [10.    7.62]\r\nFigure size for test7  [10.    7.28]\r\n```\r\n\r\nBelow the images generated by test0 and test7\r\n![test0](https://user-images.githubusercontent.com/4480573/36501207-8036050c-1714-11e8-819e-6f6d8c716851.png)\r\n![test7](https://user-images.githubusercontent.com/4480573/36501211-83094406-1714-11e8-865d-0e4020cc8907.png)\r\n\r\n**Expected outcome**\r\n\r\nImage size should **not** change.\r\nResult can be achieved by setting FORCE_RESIZE_WINDOW=True in the code above.\r\nThe terminal output is then:\r\n```\r\nbackend:  TkAgg\r\nFigure size for test0  [10.    9.66]\r\nFigure size for test1  [10.    9.66]\r\nFigure size for test2  [10.    9.66]\r\nFigure size for test3  [10.    9.66]\r\nFigure size for test4  [10.    9.66]\r\nFigure size for test5  [10.    9.66]\r\nFigure size for test6  [10.    9.66]\r\nFigure size for test7  [10.    9.66]\r\n```\r\nWhile the script reports 9.66in in height, note the outputted files are correctly 1000x1000 as shown below:\r\n![test0](https://user-images.githubusercontent.com/4480573/36501337-de6d5e18-1714-11e8-98ef-a4d2a1f397b1.png)\r\n![test7](https://user-images.githubusercontent.com/4480573/36501350-e25a71b4-1714-11e8-966c-c05530cec422.png)\r\n\r\n**Matplotlib version**\r\n  * Operating system: debian\r\n  * Matplotlib version: 2.1.2 (installed w/ pip)\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): TkAgg\r\n  * Python version: 3.5\r\n  * Jupyter version (if applicable): N/A\r\n  * Other libraries: \r\n","author":{"url":"https://github.com/taiya","@type":"Person","name":"taiya"},"datePublished":"2018-02-21T19:43:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/10560/matplotlib/issues/10560"}