#2513 - Elliptical arrows can not be saved to the png

 Add UT

api/tests/integration/ref/rendering/render_reactions.py.out

@@ -13,3 +13,5 @@ issue 2444 wrong arrow and plus width
 issue_2444.png rendering status: OK
 issue 2512 two short equilibrium half arrows
 issue_2512.png rendering status: OK
+issue 2513 elliptical-arc-arrow render error
+issue_2513.png rendering status: OK

api/tests/integration/tests/rendering/reactions/issue_2513.ket

@@ -0,0 +1,102 @@
+{
+    "root": {
+        "nodes": [
+            {
+                "$ref": "mol0"
+            },
+            {
+                "$ref": "mol1"
+            },
+            {
+                "$ref": "mol2"
+            },
+            {
+                "type": "arrow",
+                "data": {
+                    "mode": "elliptical-arc-arrow-open-angle",
+                    "pos": [
+                        {
+                            "x": 5.799999999999997,
+                            "y": -8.200000000000003,
+                            "z": 0
+                        },
+                        {
+                            "x": 7.205569279687058,
+                            "y": -8.200000000000003,
+                            "z": 0
+                        }
+                    ],
+                    "height": 1
+                }
+            },
+            {
+                "type": "arrow",
+                "data": {
+                    "mode": "open-angle",
+                    "pos": [
+                        {
+                            "x": 7.775,
+                            "y": -8.225,
+                            "z": 0
+                        },
+                        {
+                            "x": 8.875,
+                            "y": -8.225,
+                            "z": 0
+                        }
+                    ]
+                }
+            },
+            {
+                "type": "plus",
+                "location": [
+                    6.525,
+                    -8.225,
+                    0
+                ],
+                "prop": {}
+            }
+        ],
+        "connections": [],
+        "templates": []
+    },
+    "mol0": {
+        "type": "molecule",
+        "atoms": [
+            {
+                "label": "N",
+                "location": [
+                    5.749999999999999,
+                    -8.350000000000001,
+                    0
+                ]
+            }
+        ]
+    },
+    "mol1": {
+        "type": "molecule",
+        "atoms": [
+            {
+                "label": "O",
+                "location": [
+                    7.3999999999999995,
+                    -8.3,
+                    0
+                ]
+            }
+        ]
+    },
+    "mol2": {
+        "type": "molecule",
+        "atoms": [
+            {
+                "label": "C",
+                "location": [
+                    9.15,
+                    -8.3,
+                    0
+                ]
+            }
+        ]
+    }
+}

api/tests/integration/tests/rendering/render_reactions.py

@@ -105,6 +105,18 @@ def renderRxnfile(filename, outfile):
 renderer.renderToFile(rxn, joinPathPy("out/" + png_fname, __file__))
 print(checkImageSimilarity(png_fname))
 
+print("issue 2513 elliptical-arc-arrow render error")
+indigo.resetOptions()
+indigo.setOption("ignore-stereochemistry-errors", "true")
+indigo.setOption("render-background-color", "255, 255, 255")
+indigo.setOption("render-output-format", "png")
+fname = "issue_2513"
+png_fname = fname + ".png"
+ket_fname = joinPathPy("reactions/%s.ket" % fname, __file__)
+rxn = indigo.loadReactionFromFile(ket_fname)
+renderer.renderToFile(rxn, joinPathPy("out/" + png_fname, __file__))
+print(checkImageSimilarity(png_fname))
+
 if isIronPython():
     renderer.Dispose()
     indigo.Dispose()

utils/indigo-service/backend/service/tests/api/indigo_test.py

@@ -1670,6 +1670,129 @@ def test_check_overlap(self):
             result_data["overlapping_atoms"],
         )
 
+    def test_render_eleptical_arrow(self):
+
+        ket = """{
+    "root": {
+        "nodes": [
+            {
+                "$ref": "mol0"
+            },
+            {
+                "$ref": "mol1"
+            },
+            {
+                "$ref": "mol2"
+            },
+            {
+                "type": "arrow",
+                "data": {
+                    "mode": "elliptical-arc-arrow-open-angle",
+                    "pos": [
+                        {
+                            "x": 5.799999999999997,
+                            "y": -8.200000000000003,
+                            "z": 0
+                        },
+                        {
+                            "x": 7.205569279687058,
+                            "y": -8.200000000000003,
+                            "z": 0
+                        }
+                    ],
+                    "height": 1
+                }
+            },
+            {
+                "type": "arrow",
+                "data": {
+                    "mode": "open-angle",
+                    "pos": [
+                        {
+                            "x": 7.775,
+                            "y": -8.225,
+                            "z": 0
+                        },
+                        {
+                            "x": 8.875,
+                            "y": -8.225,
+                            "z": 0
+                        }
+                    ]
+                }
+            },
+            {
+                "type": "plus",
+                "location": [
+                    6.525,
+                    -8.225,
+                    0
+                ],
+                "prop": {}
+            }
+        ],
+        "connections": [],
+        "templates": []
+    },
+    "mol0": {
+        "type": "molecule",
+        "atoms": [
+            {
+                "label": "N",
+                "location": [
+                    5.749999999999999,
+                    -8.350000000000001,
+                    0
+                ]
+            }
+        ]
+    },
+    "mol1": {
+        "type": "molecule",
+        "atoms": [
+            {
+                "label": "O",
+                "location": [
+                    7.3999999999999995,
+                    -8.3,
+                    0
+                ]
+            }
+        ]
+    },
+    "mol2": {
+        "type": "molecule",
+        "atoms": [
+            {
+                "label": "C",
+                "location": [
+                    9.15,
+                    -8.3,
+                    0
+                ]
+            }
+        ]
+    }
+}"""
+        ref_path = joinPathPy("ref/", __file__)
+        headers, data = self.get_headers(
+            {
+                "output_format": "image/png",
+                "struct": ket,
+            }
+        )
+        result = requests.post(
+            self.url_prefix + "/render",
+            headers=headers,
+            data=data,
+        )
+        fname = "render-eleptical-arrow.png"
+        with open(os.path.join(ref_path, fname), "wb") as file:
+            file.write(result.content)
+        with open(os.path.join(ref_path, fname), "rb") as file:
+            ref = file.read()
+            self.assertEqual(result.content, ref)
+
     def test_check_stereo(self):
         # up
         headers, data = self.get_headers(