From 0b8490325100dcc4b886bb5796b06564102f2179 Mon Sep 17 00:00:00 2001
From: cirun <cirun@live.com>
Date: Tue, 23 Jul 2024 19:37:17 +0200
Subject: [PATCH] LLCAXCHZF-54/implement option to invert x and y axes

---
 ckanext/charts/chart_builders/base.py    | 24 ++++++++++++++++++++++++
 ckanext/charts/chart_builders/chartjs.py | 13 ++++++++++++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/ckanext/charts/chart_builders/base.py b/ckanext/charts/chart_builders/base.py
index 7677a63..58d4690 100644
--- a/ckanext/charts/chart_builders/base.py
+++ b/ckanext/charts/chart_builders/base.py
@@ -469,6 +469,30 @@ def sort_y_field(self) -> dict[str, Any]:
             ],
         }
 
+    def invert_x_field(self) -> dict[str, Any]:
+        return {
+            "field_name": "invert_x",
+            "label": "Invert X-axis",
+            "form_snippet": "chart_checkbox.html",
+            "group": "Data",
+            "validators": [
+                self.get_validator("default")(False),
+                self.get_validator("boolean_validator"),
+            ],
+        }
+
+    def invert_y_field(self) -> dict[str, Any]:
+        return {
+            "field_name": "invert_y",
+            "label": "Invert Y-axis",
+            "form_snippet": "chart_checkbox.html",
+            "group": "Data",
+            "validators": [
+                self.get_validator("default")(False),
+                self.get_validator("boolean_validator"),
+            ],
+        }
+
     def log_x_field(self) -> dict[str, Any]:
         return {
             "field_name": "log_x",
diff --git a/ckanext/charts/chart_builders/chartjs.py b/ckanext/charts/chart_builders/chartjs.py
index 4a94dee..3ebb39a 100644
--- a/ckanext/charts/chart_builders/chartjs.py
+++ b/ckanext/charts/chart_builders/chartjs.py
@@ -115,7 +115,16 @@ def to_json(self) -> str:
         data: dict[str, Any] = {
             "type": "line",
             "data": {"labels": self.df[self.settings["x"]].to_list()},
-            "options": self.settings,
+            "options": {
+                "scales": {
+                    "x": {
+                        "reverse": self.settings.get("invert_x", False),
+                    },
+                    "y": {
+                        "reverse": self.settings.get("invert_y", False),
+                    }
+                }
+            }
         }
 
         datasets = []
@@ -151,6 +160,8 @@ def get_form_fields(self):
             self.sort_x_field(),
             self.sort_y_field(),
             self.limit_field(),
+            self.invert_x_field(),
+            self.invert_y_field(),
             self.filter_field(columns),
         ]