Restored correct velocity sampler

Fixes ChartsOrg/Charts#3883
rcblue · Jan 23, 2020 · 5acd48c · 5acd48c
1 parent 0d9b54d
commit 5acd48c
Showing 1 changed file with 18 additions and 6 deletions.
diff --git a/Source/Charts/Charts/PieRadarChartViewBase.swift b/Source/Charts/Charts/PieRadarChartViewBase.swift
@@ -677,13 +677,25 @@ open class PieRadarChartViewBase: ChartViewBase
         }()
 
         // Remove samples older than our sample time - 1 seconds
-        // while keeping at least one samples
-        let index = velocitySamples
-            .dropLast()
-            .lastIndex { $0.time < currentSample.time - 1 }
-        if let index = index {
-            velocitySamples.remove(at: index)
+        // while keeping at least one sample
+
+        var i = 0, count = velocitySamples.count
+        while (i < count - 2)
+        {
+            if currentSample.time - velocitySamples[i].time > 1.0
+            {
+                velocitySamples.remove(at: 0)
+                i -= 1
+                count -= 1
+            }
+            else
+            {
+                break
+            }
+
+            i += 1
         }
+
         velocitySamples.append(currentSample)
     }