René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: RangeSlider.set_val does not move the slider (only poly and value)","articleBody":"### Bug summary\n\nWhen I call `RangeSlider.set_val([0.0,0.1])`\r\nIt changes only the blue poly object and the range value on the right side of the slider not the dot:\r\n![Capture d’écran, le 2022-03-25 à 18 00 59](https://user-images.githubusercontent.com/37241971/160208124-63db8584-6a4b-470a-a8dd-a0c2394c889e.jpg)\r\n\r\n\n\n### Code for reproduction\n\n```python\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\nfrom matplotlib.widgets import RangeSlider\r\n\r\n# generate a fake image\r\nnp.random.seed(19680801)\r\nN = 128\r\nimg = np.random.randn(N, N)\r\n\r\nfig, axs = plt.subplots(1, 2, figsize=(10, 5))\r\nfig.subplots_adjust(bottom=0.25)\r\n\r\nim = axs[0].imshow(img)\r\naxs[1].hist(img.flatten(), bins='auto')\r\naxs[1].set_title('Histogram of pixel intensities')\r\n\r\n# Create the RangeSlider\r\nslider_ax = fig.add_axes([0.20, 0.1, 0.60, 0.03])\r\nslider = RangeSlider(slider_ax, \"Threshold\", img.min(), img.max(),valinit=[0.0,1])\r\n\r\n# Create the Vertical lines on the histogram\r\nlower_limit_line = axs[1].axvline(slider.val[0], color='k')\r\nupper_limit_line = axs[1].axvline(slider.val[1], color='k')\r\n\r\n\r\ndef update(val):\r\n    # The val passed to a callback by the RangeSlider will\r\n    # be a tuple of (min, max)\r\n\r\n    # Update the image's colormap\r\n    im.norm.vmin = val[0]\r\n    im.norm.vmax = val[1]\r\n\r\n    # Update the position of the vertical lines\r\n    lower_limit_line.set_xdata([val[0], val[0]])\r\n    upper_limit_line.set_xdata([val[1], val[1]])\r\n\r\n    # Redraw the figure to ensure it updates\r\n    fig.canvas.draw_idle()\r\n\r\nslider.set_val([0.0,5])\r\nslider.on_changed(update)\r\nplt.show()\n```\n\n\n### Actual outcome\n\n I does not move the slider\r\n![Capture d’écran, le 2022-03-25 à 18 04 26](https://user-images.githubusercontent.com/37241971/160208380-7c1618bf-02fa-457f-ab80-0394ca0b7096.jpg)\r\n\r\n\n\n### Expected outcome\n\n It should move the slider\n\n### Additional information\n\n_No response_\n\n### Operating system\n\nOSX\n\n### Matplotlib Version\n\n3.5.1\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n3.8\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/vpicouet","@type":"Person","name":"vpicouet"},"datePublished":"2022-03-25T22:04:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/22706/matplotlib/issues/22706"}