POC: Annulus support in Imviz

that needs glue-viz/glue-astronomy#90

notebooks/concepts/imviz_annulus_region.ipynb

@@ -0,0 +1,135 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "d9570264",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy as np\n",
+    "from glue_astronomy.translators.regions import _annulus_to_subset_state\n",
+    "from regions import CircleAnnulusPixelRegion, PixCoord\n",
+    "\n",
+    "from jdaviz import Imviz"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "070974fc",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "a = np.arange(100).reshape((10, 10))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "048d90d3",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "imviz = Imviz()\n",
+    "imviz.load_data(a)\n",
+    "imviz.show()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "5bf8cb48",
+   "metadata": {},
+   "source": [
+    "Add annulus region to Imviz. Maybe turn this into a plugin?"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "9c38c2d2",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "data = imviz.app.data_collection[0]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "b02e7ee0",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "reg = CircleAnnulusPixelRegion(center=PixCoord(x=4.5, y=4.5), inner_radius=2, outer_radius=3)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "58717669",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sbst = _annulus_to_subset_state(reg, data)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "77e2a17b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "imviz.app.data_collection.new_subset_group(subset_state=sbst)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "139850a2",
+   "metadata": {},
+   "source": [
+    "Get annulus region back."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "ad53d98b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "data.get_selection_definition(subset_id='Subset 1', format='astropy-regions')"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "e1c374a4",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.8"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}