From 5c371cf6fc7601620e8dc5093355b13b4be71b2e Mon Sep 17 00:00:00 2001
From: Victor Choueiri <victor@ctrlanddev.com>
Date: Wed, 21 Mar 2018 03:45:17 +0200
Subject: [PATCH] Fix: null labelPainter

---
 lib/src/animated_circular_chart.dart |  2 +-
 lib/src/painter.dart                 | 26 ++++++++++++++------------
 2 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/lib/src/animated_circular_chart.dart b/lib/src/animated_circular_chart.dart
index 7679d40..47cef1f 100644
--- a/lib/src/animated_circular_chart.dart
+++ b/lib/src/animated_circular_chart.dart
@@ -243,7 +243,7 @@ class AnimatedCircularChartState extends State<AnimatedCircularChart>
       size: widget.size,
       painter: new AnimatedCircularChartPainter(
         _tween.animate(_animation),
-        _labelPainter,
+        widget.holeLabel != null ? _labelPainter : null,
       ),
     );
   }
diff --git a/lib/src/painter.dart b/lib/src/painter.dart
index d6ef54c..fa6d971 100644
--- a/lib/src/painter.dart
+++ b/lib/src/painter.dart
@@ -14,12 +14,7 @@ class AnimatedCircularChartPainter extends CustomPainter {
 
   @override
   void paint(Canvas canvas, Size size) {
-    labelPainter.paint(
-        canvas,
-        new Offset(
-          size.width / 2 - labelPainter.width / 2,
-          size.height / 2 - labelPainter.height / 2,
-        ));
+    _paintLabel(canvas, size, labelPainter);
     _paintChart(canvas, size, animation.value);
   }
 
@@ -35,12 +30,7 @@ class CircularChartPainter extends CustomPainter {
 
   @override
   void paint(Canvas canvas, Size size) {
-    labelPainter.paint(
-        canvas,
-        new Offset(
-          size.width / 2 - labelPainter.width / 2,
-          size.height / 2 - labelPainter.height / 2,
-        ));
+    _paintLabel(canvas, size, labelPainter);
     _paintChart(canvas, size, chart);
   }
 
@@ -50,6 +40,18 @@ class CircularChartPainter extends CustomPainter {
 
 const double _kRadiansPerDegree = Math.pi / 180;
 
+void _paintLabel(Canvas canvas, Size size, TextPainter labelPainter) {
+  if (labelPainter != null) {
+    labelPainter.paint(
+      canvas,
+      new Offset(
+        size.width / 2 - labelPainter.width / 2,
+        size.height / 2 - labelPainter.height / 2,
+      ),
+    );
+  }
+}
+
 void _paintChart(Canvas canvas, Size size, CircularChart chart) {
   final Paint segmentPaint = new Paint()
     ..style = chart.chartType == CircularChartType.Radial