René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Fixed ImageStatsTool displaying \"No available data\" for `XYImageItem` and `MaskedXYImageItem`","articleBody":"## Description\n\n### Problem\nThe ImageStatsTool displays \"No available data\" instead of showing statistics when used on `XYImageItem` or `MaskedXYImageItem` objects (images with non-uniform coordinates).\n\n### Steps to Reproduce\n1. Create an XYImageItem with non-uniform x/y coordinates\n2. Add it to a plot\n3. Activate the ImageStatsTool\n4. Draw a rectangle over the image\n5. Expected: Statistics should be displayed in the rectangle\n6. Actual: \"No available data\" is shown\n\n### Minimal Example\n```python\nimport numpy as np\nfrom plotpy.builder import make\nfrom plotpy.plot import PlotDialog\nfrom plotpy.tools import ImageStatsTool\n\n# Create test data\ndata = np.random.rand(100, 100)\nx = np.linspace(0, 10, 100)\ny = np.linspace(0, 20, 100)\n\n# Create an XY image item (non-uniform coordinates)\nimage = make.xyimage(x, y, data, title=\"Test XY Image\")\n\n# Create a plot with the image\nwin = PlotDialog(edit=False, toolbar=True)\nplot = win.manager.get_plot()\nplot.add_item(image)\n\n# Add ImageStatsTool\ntool = ImageStatsTool(win.manager)\nwin.manager.add_tool(tool)\n\nwin.exec()\n```\n\n### Root Cause\nThe `ImageStatsRectangle.get_info()` method calls `get_items_in_rectangle()` which filters items by calling `plot.get_items(item_type=IExportROIImageItemType)`. This method checks if `item_type in item.types()`.\n\n`XYImageItem.types()` was missing `IExportROIImageItemType`, causing XY images to be filtered out during the search, resulting in no items being found and the \"No available data\" message.\n\n### Solution\nAdd `IExportROIImageItemType` to the tuple returned by `XYImageItem.types()`.\n\nAdditionally, update `__implements__` tuples for consistency:\n- Add `IHistDataSource`, `IVoiImageItemType`, and `IExportROIImageItemType` to `XYImageItem.__implements__`\n- Add `IExportROIImageItemType` to `MaskedXYImageItem.__implements__`\n- Add `IExportROIImageItemType` to `MaskedImageItem.__implements__`\n\n### Files to Modify\n- `plotpy/items/image/standard.py` - XYImageItem.types() and __implements__\n- `plotpy/items/image/masked.py` - MaskedXYImageItem.__implements__ and MaskedImageItem.__implements__\n\n### Additional Context\n- Regular `ImageItem` works correctly because it inherits from `RawImageItem` which inherits from `BaseImageItem`, and `BaseImageItem.types()` includes `IExportROIImageItemType`\n- XYImageItem overrides `types()` but was missing this interface type\n- The underlying methods (`get_closest_index_rect()`, `export_roi()`) work correctly for XY images; only the interface declaration was missing\n","author":{"url":"https://github.com/PierreRaybaut","@type":"Person","name":"PierreRaybaut"},"datePublished":"2025-10-30T17:43:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/50/PlotPy/issues/50"}