From 56b8cdd47862d68a532f034db160ace8da3592bb Mon Sep 17 00:00:00 2001
From: Chris Elliot <chriselliotuk@gmail.com>
Date: Wed, 17 Jul 2024 16:29:28 +0100
Subject: [PATCH] add startMin param

---
 lib/src/chart/base/axis_chart/axis_chart_data.dart    |  8 ++++++++
 lib/src/chart/base/axis_chart/axis_chart_helper.dart  | 11 +++++++++--
 lib/src/chart/base/axis_chart/axis_chart_painter.dart |  3 +++
 .../axis_chart/side_titles/side_titles_widget.dart    |  1 +
 4 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/lib/src/chart/base/axis_chart/axis_chart_data.dart b/lib/src/chart/base/axis_chart/axis_chart_data.dart
index 78ca3007d..e39db1c74 100644
--- a/lib/src/chart/base/axis_chart/axis_chart_data.dart
+++ b/lib/src/chart/base/axis_chart/axis_chart_data.dart
@@ -161,6 +161,7 @@ class SideTitles with EquatableMixin {
     this.getTitlesWidget = defaultGetTitle,
     this.reservedSize = 22,
     this.interval,
+    this.startMin = false,
   }) : assert(interval != 0, "SideTitles.interval couldn't be zero");
 
   /// Determines showing or hiding this side titles
@@ -178,6 +179,9 @@ class SideTitles with EquatableMixin {
   /// we try to find a suitable value to set as [interval] under the hood.
   final double? interval;
 
+  /// If [startMin] is true, then the interval will start from the min value.
+  final bool startMin;
+
   /// Lerps a [SideTitles] based on [t] value, check [Tween.lerp].
   static SideTitles lerp(SideTitles a, SideTitles b, double t) {
     return SideTitles(
@@ -548,6 +552,7 @@ class FlGridData with EquatableMixin {
     this.verticalInterval,
     this.getDrawingVerticalLine = defaultGridLine,
     this.checkToShowVerticalLine = showAllGrids,
+    this.startMin = false,
   })  : assert(
           horizontalInterval != 0,
           "FlGridData.horizontalInterval couldn't be zero",
@@ -584,6 +589,9 @@ class FlGridData with EquatableMixin {
   /// Gives you a x value, and gets a boolean that determines showing or hiding specified line.
   final CheckToShowGrid checkToShowVerticalLine;
 
+  /// If true then the horizontal interval will start from the min value.
+  final bool startMin;
+
   /// Lerps a [FlGridData] based on [t] value, check [Tween.lerp].
   static FlGridData lerp(FlGridData a, FlGridData b, double t) {
     return FlGridData(
diff --git a/lib/src/chart/base/axis_chart/axis_chart_helper.dart b/lib/src/chart/base/axis_chart/axis_chart_helper.dart
index 4d16a411b..343c61b44 100644
--- a/lib/src/chart/base/axis_chart/axis_chart_helper.dart
+++ b/lib/src/chart/base/axis_chart/axis_chart_helper.dart
@@ -26,9 +26,16 @@ class AxisChartHelper {
     bool maxIncluded = true,
     required double baseLine,
     required double interval,
+    bool startMin = false,
   }) sync* {
-    final initialValue = Utils()
-        .getBestInitialIntervalValue(min, max, interval, baseline: baseLine);
+    final initialValue = startMin
+        ? min
+        : Utils().getBestInitialIntervalValue(
+            min,
+            max,
+            interval,
+            baseline: baseLine,
+          );
     var axisSeek = initialValue;
     final firstPositionOverlapsWithMin = axisSeek == min;
     if (!minIncluded && firstPositionOverlapsWithMin) {
diff --git a/lib/src/chart/base/axis_chart/axis_chart_painter.dart b/lib/src/chart/base/axis_chart/axis_chart_painter.dart
index 3b0ff7f03..4fa23fd32 100644
--- a/lib/src/chart/base/axis_chart/axis_chart_painter.dart
+++ b/lib/src/chart/base/axis_chart/axis_chart_painter.dart
@@ -68,6 +68,7 @@ abstract class AxisChartPainter<D extends AxisChartData>
         maxIncluded: false,
         baseLine: data.baselineX,
         interval: verticalInterval,
+        startMin: data.gridData.startMin,
       );
       for (final axisValue in axisValues) {
         if (!data.gridData.checkToShowVerticalLine(axisValue)) {
@@ -113,6 +114,7 @@ abstract class AxisChartPainter<D extends AxisChartData>
         maxIncluded: false,
         baseLine: data.baselineY,
         interval: horizontalInterval,
+        startMin: data.gridData.startMin,
       );
       for (final axisValue in axisValues) {
         if (!data.gridData.checkToShowHorizontalLine(axisValue)) {
@@ -121,6 +123,7 @@ abstract class AxisChartPainter<D extends AxisChartData>
         final flLine = data.gridData.getDrawingHorizontalLine(axisValue);
 
         final bothY = getPixelY(axisValue, viewSize, holder);
+
         const x1 = 0.0;
         final y1 = bothY;
         final x2 = viewSize.width;
diff --git a/lib/src/chart/base/axis_chart/side_titles/side_titles_widget.dart b/lib/src/chart/base/axis_chart/side_titles/side_titles_widget.dart
index aa3f58ea5..9feaebda1 100644
--- a/lib/src/chart/base/axis_chart/side_titles/side_titles_widget.dart
+++ b/lib/src/chart/base/axis_chart/side_titles/side_titles_widget.dart
@@ -135,6 +135,7 @@ class SideTitlesWidget extends StatelessWidget {
         max: axisMax,
         baseLine: axisBaseLine,
         interval: interval,
+        startMin: sideTitles.startMin,
       );
       axisPositions = axisValues.map((axisValue) {
         final axisDiff = axisMax - axisMin;