René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[ENH]: Built-in crosshair tool through gui-native crosshair cursor","articleBody":"### Problem\n\nOur naive approaches to crosshair cursors https://matplotlib.org/devdocs/gallery/widgets/cursor.html have the disadvantage that the crosshair is drawn on the figure. This means an expensive redraw of the the figure for every cursor position change and results in a laggy behavior.\n\n### Proposed solution\n\nWe could grow an API on Canvas to draw a crosshair with GUI native lines. That should be relatively easy. We only need the size of the Axes-under-cursor in figure coordinates to determine the length of the crosshair.\n\nThe goal would be to add a crosshair tool in addtion to Pan and Zoom.\n\nThis tool should be much easier to use than a Cursor widget and much more efficient.","author":{"url":"https://github.com/timhoffm","@type":"Person","name":"timhoffm"},"datePublished":"2025-09-04T22:26:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/30515/matplotlib/issues/30515"}