From 478e5e6a3f172cdd8da85688db9aab5d214151ce Mon Sep 17 00:00:00 2001
From: Anas <anasmd7530@gmail.com>
Date: Mon, 26 Jun 2023 21:46:16 +0530
Subject: [PATCH] fix tooltip not displaying

---
 CHANGELOG.md                                  |  1 +
 .../chart/bar_chart/bar_chart_painter.dart    |  6 +-
 .../bar_chart/bar_chart_painter_test.dart     | 72 +++++++++++++++++++
 3 files changed, 77 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8041c2d22..49e540d09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,5 @@
 ## nextVersion
+* **BUGFIX** (by @Anas35) Fix Tooltip not displaying when value from BackgroundBarChartRodData is less than zero. #1345.
 
 ## 0.63.0
 * **BUGFIX** (by @imaNNeo) Fix PieChart crash on web-renderer html by ignoring `sectionsSpace` when `Path.combine()` does not work (it's flutter engine [issue](https://github.com/flutter/flutter/issues/44572)), #955
diff --git a/lib/src/chart/bar_chart/bar_chart_painter.dart b/lib/src/chart/bar_chart/bar_chart_painter.dart
index c11d99c5a..d882cb8be 100644
--- a/lib/src/chart/bar_chart/bar_chart_painter.dart
+++ b/lib/src/chart/bar_chart/bar_chart_painter.dart
@@ -599,13 +599,15 @@ class BarChartPainter extends AxisChartPainter<BarChartData> {
             holder,
           );
           barBotY = getPixelY(
-            targetData.barGroups[i].barRods[j].fromY,
+            targetData.barGroups[i].barRods[j].fromY +
+                targetData.barGroups[i].barRods[j].backDrawRodData.fromY,
             viewSize,
             holder,
           );
         } else {
           barTopY = getPixelY(
-            targetData.barGroups[i].barRods[j].fromY,
+            targetData.barGroups[i].barRods[j].fromY +
+                targetData.barGroups[i].barRods[j].backDrawRodData.fromY,
             viewSize,
             holder,
           );
diff --git a/test/chart/bar_chart/bar_chart_painter_test.dart b/test/chart/bar_chart/bar_chart_painter_test.dart
index 71169138e..957affaf6 100644
--- a/test/chart/bar_chart/bar_chart_painter_test.dart
+++ b/test/chart/bar_chart/bar_chart_painter_test.dart
@@ -1641,6 +1641,78 @@ void main() {
       expect(result3.touchedRodDataIndex, 0);
       expect(result3.touchedStackItemIndex, -1);
     });
+
+    test('test 3', () {
+      const viewSize = Size(200, 100);
+
+      final barGroups = [
+        BarChartGroupData(
+          x: 1,
+          barRods: [
+            BarChartRodData(
+              toY: 5,
+              backDrawRodData: BackgroundBarChartRodData(
+                show: true,
+                fromY: -5,
+                toY: 5,
+              ),
+            ),
+          ],
+        ),
+        BarChartGroupData(
+          x: 1,
+          barRods: [
+            BarChartRodData(
+              toY: -6,
+              backDrawRodData: BackgroundBarChartRodData(
+                show: true,
+                fromY: 5,
+                toY: -6,
+              ),
+            ),
+          ],
+        ),
+      ];
+
+      final data = BarChartData(
+        barGroups: barGroups,
+        titlesData: const FlTitlesData(show: false),
+        alignment: BarChartAlignment.start,
+        groupsSpace: 10,
+        minY: -10,
+        maxY: 15,
+        barTouchData: BarTouchData(
+          enabled: true,
+          handleBuiltInTouches: true,
+          allowTouchBarBackDraw: true,
+          touchExtraThreshold: const EdgeInsets.all(1),
+        ),
+      );
+
+      final painter = BarChartPainter();
+      final holder = PaintHolder<BarChartData>(data, data, 1);
+
+      final result1 =
+          painter.handleTouch(const Offset(4, 60), viewSize, holder);
+      expect(result1!.touchedBarGroupIndex, 0);
+      expect(result1.touchedRodDataIndex, 0);
+
+      // tap below the positive bar
+      final result11 =
+          painter.handleTouch(const Offset(4, 61.1), viewSize, holder);
+      expect(result11!.touchedBarGroupIndex, 0);
+      expect(result11.touchedRodDataIndex, 0);
+
+      final result2 =
+          painter.handleTouch(const Offset(22, 60), viewSize, holder);
+      expect(result2!.touchedBarGroupIndex, 1);
+      expect(result2.touchedRodDataIndex, 0);
+
+      final result22 =
+          painter.handleTouch(const Offset(22, 58.9), viewSize, holder);
+      expect(result22!.touchedBarGroupIndex, 1);
+      expect(result22.touchedRodDataIndex, 0);
+    });
   });
 
   group('drawExtraLines()', () {