René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Doc]: Example for \"Scale invariant angle label\" does not scale the arc correctly","articleBody":"### Bug summary\r\n\r\nWhen setting a dpi value and using `unit = 'points'` in the [AngleAnnotation](https://matplotlib.org/devdocs/gallery/text_labels_and_annotations/angle_annotation.html#angleannotation-class) example class, it does not scale the Arc width and height correctly. I will use the example from the link above to show the problem:\r\n\r\n### Code for reproduction\r\n\r\n```python\r\nfig, ax = plt.subplots(dpi=300)\r\nfig.canvas.draw()  # Need to draw the figure to define renderer\r\nax.set_title(\"AngleLabel example\")\r\n\r\n# Plot two crossing lines and label each angle between them with the above\r\n# ``AngleAnnotation`` tool.\r\ncenter = (4.5, 650)\r\np1 = [(2.5, 710), (6.0, 605)]\r\np2 = [(3.0, 275), (5.5, 900)]\r\nline1, = ax.plot(*zip(*p1))\r\nline2, = ax.plot(*zip(*p2))\r\npoint, = ax.plot(*center, marker=\"o\")\r\n\r\nam1 = AngleAnnotation(center, p1[1], p2[1], ax=ax, size=75, text=r\"$\\alpha$\")\r\nam2 = AngleAnnotation(center, p2[1], p1[0], ax=ax, size=35, text=r\"$\\beta$\")\r\nam3 = AngleAnnotation(center, p1[0], p2[0], ax=ax, size=75, text=r\"$\\gamma$\")\r\nam4 = AngleAnnotation(center, p2[0], p1[1], ax=ax, size=35, text=r\"$\\theta$\")\r\n\r\n\r\n# Showcase some styling options for the angle arc, as well as the text.\r\np = [(6.0, 400), (5.3, 410), (5.6, 300)]\r\nax.plot(*zip(*p))\r\nam5 = AngleAnnotation(p[1], p[0], p[2], ax=ax, size=40, text=r\"$\\Phi$\",\r\n                      linestyle=\"--\", color=\"gray\", textposition=\"outside\",\r\n                      text_kw=dict(fontsize=16, color=\"gray\"))\r\nplt.show()\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\n![ActualOutcome](https://user-images.githubusercontent.com/39338429/152516317-dc1c0448-9c57-43c4-a4c9-f6114ec07393.png)\r\n\r\n\r\n### Expected outcome\r\n\r\n![ExpectedOutcome](https://user-images.githubusercontent.com/39338429/152516400-ad9eb3b6-0881-4499-bee2-6585c5e47b4f.png)\r\n\r\nThe expected outcome can be produced when changing `size` to `get_size()` in the Arc initialisation.\r\n\r\n```python\r\nsuper().__init__(self._xydata, self.get_size(), self.get_size(), angle=0.0,\r\n                 theta1=self.theta1, theta2=self.theta2, **kwargs)\r\n```\r\n\r\n### Additional information\r\n\r\n_No response_\r\n\r\n### Operating system\r\n\r\n_No response_\r\n\r\n### Matplotlib Version\r\n\r\n3.5.1\r\n\r\n### Matplotlib Backend\r\n\r\n_No response_\r\n\r\n### Python version\r\n\r\n_No response_\r\n\r\n### Jupyter version\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\n_No response_","author":{"url":"https://github.com/wayofsamu","@type":"Person","name":"wayofsamu"},"datePublished":"2022-02-04T10:50:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/22392/matplotlib/issues/22392"}