From 3ccb5a42d412f63a2e74eab1464bd8c4a11d0795 Mon Sep 17 00:00:00 2001
From: TAJAOUART Mounir <tajaouartm@gmail.com>
Date: Fri, 10 Feb 2023 10:14:01 +0100
Subject: [PATCH] delete data that is no longer displayed on the graph after
 exceeding y axis

---
 lib/src/live_chart.dart | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/src/live_chart.dart b/lib/src/live_chart.dart
index f8691a0..a143706 100644
--- a/lib/src/live_chart.dart
+++ b/lib/src/live_chart.dart
@@ -47,6 +47,8 @@ class RealTimeGraphState extends State<RealTimeGraph>
   List<Point<double>> _data = [];
   Timer? timer;
 
+  double canvasWidth = 1000;
+
   @override
   void initState() {
     super.initState();
@@ -56,7 +58,8 @@ class RealTimeGraphState extends State<RealTimeGraph>
 
     // Start a periodic timer to update the data for visualization
     timer = Timer.periodic(widget.updateDelay, (_) {
-      //_data.removeWhere((element) => element.y > 100);
+      // delete data that is no longer displayed on the graph.
+      _data.removeWhere((element) => element.x < canvasWidth * -1.5);
 
       // Clone the data to avoid modifying the original list while iterating
       List<Point<double>> data = _data.map((e) => e).toList();
@@ -113,6 +116,8 @@ class RealTimeGraphState extends State<RealTimeGraph>
                       return const SizedBox.shrink();
                     }
 
+                    canvasWidth = constraints.maxWidth;
+
                     return SizedBox(
                       key: Key(
                           '${constraints.maxWidth}${constraints.maxHeight}'),