Highlight enhancements (Closes #654, closes #702)

Charts/Classes/Charts/BarChartView.swift

@@ -66,7 +66,7 @@ public class BarChartView: BarLineChartViewBase, BarChartDataProvider
             return nil
         }
 
-        return self.highlighter?.getHighlight(x: Double(pt.x), y: Double(pt.y))
+        return self.highlighter?.getHighlight(x: pt.x, y: pt.y)
     }
 
     /// - returns: the bounding box of the specified Entry in the specified DataSet. Returns null if the Entry could not be found in the charts data.

Charts/Classes/Charts/BarLineChartViewBase.swift

@@ -1618,7 +1618,7 @@ public class BarLineChartViewBase: ChartViewBase, BarLineScatterCandleBubbleChar
             return nil
         }
 
-        return self.highlighter?.getHighlight(x: Double(pt.x), y: Double(pt.y))
+        return self.highlighter?.getHighlight(x: pt.x, y: pt.y)
     }
 
     /// - returns: the x and y values in the chart at the given touch point

Charts/Classes/Charts/ChartViewBase.swift

@@ -448,6 +448,13 @@ public class ChartViewBase: NSUIView, ChartDataProvider, ChartAnimatorDelegate
         highlightValue(highlight: highlight, callDelegate: false)
     }
 
+    /// Highlights the value at the given x-index in the given DataSet.
+    /// Provide -1 as the x-index to undo all highlighting.
+    public func highlightValue(xIndex xIndex: Int, dataSetIndex: Int)
+    {
+        highlightValue(xIndex: xIndex, dataSetIndex: dataSetIndex, callDelegate: true)
+    }
+
     /// Highlights the value at the given x-index in the given DataSet.
     /// Provide -1 as the x-index to undo all highlighting.
     public func highlightValue(xIndex xIndex: Int, dataSetIndex: Int, callDelegate: Bool)
@@ -482,7 +489,9 @@ public class ChartViewBase: NSUIView, ChartDataProvider, ChartAnimatorDelegate
         {
             // set the indices to highlight
             entry = _data?.getEntryForHighlight(h!)
-            if (entry === nil || entry!.xIndex != h?.xIndex)
+            if (entry == nil ||
+                entry?.xIndex != h?.xIndex ||
+                (entry?.value != h!.value && !isnan(h!.value)))
             {
                 h = nil
                 entry = nil

Charts/Classes/Charts/HorizontalBarChartView.swift

@@ -157,7 +157,7 @@ public class HorizontalBarChartView: BarChartView
             return nil
         }
 
-        return self.highlighter?.getHighlight(x: Double(pt.y), y: Double(pt.x))
+        return self.highlighter?.getHighlight(x: pt.y, y: pt.x)
     }
 
     public override var lowestVisibleXIndex: Int

Charts/Classes/Charts/PieRadarChartViewBase.swift

@@ -897,7 +897,7 @@ public class PieRadarChartViewBase: ChartViewBase
                     // get the dataset that is closest to the selection (PieChart only has one DataSet)
                     if (self.isKindOfClass(RadarChartView))
                     {
-                        dataSetIndex = ChartUtils.closestDataSetIndex(valsAtIndex, value: Double(distance / (self as! RadarChartView).factor), axis: nil)
+                        dataSetIndex = ChartUtils.closestDataSetIndexByValue(valsAtIndex: valsAtIndex, value: Double(distance / (self as! RadarChartView).factor), axis: nil) ?? -1
                     }
 
                     if (dataSetIndex < 0)

Charts/Classes/Data/Implementations/ChartBaseDataSet.swift

@@ -71,6 +71,11 @@ public class ChartBaseDataSet: NSObject, IChartDataSet
         fatalError("yValForXIndex is not implemented in ChartBaseDataSet")
     }
 
+    public func yValsForXIndex(x: Int) -> [Double]
+    {
+        fatalError("yValsForXIndex is not implemented in ChartBaseDataSet")
+    }
+
     public func entryForIndex(i: Int) -> ChartDataEntry?
     {
         fatalError("entryForIndex is not implemented in ChartBaseDataSet")
@@ -86,6 +91,11 @@ public class ChartBaseDataSet: NSObject, IChartDataSet
         fatalError("entryForXIndex is not implemented in ChartBaseDataSet")
     }
 
+    public func entriesForXIndex(x: Int) -> [ChartDataEntry]
+    {
+        fatalError("entriesForXIndex is not implemented in ChartBaseDataSet")
+    }
+
     public func entryIndex(xIndex x: Int, rounding: ChartDataSetRounding) -> Int
     {
         fatalError("entryIndex is not implemented in ChartBaseDataSet")

Charts/Classes/Data/Implementations/Standard/ChartData.swift

@@ -439,7 +439,18 @@ public class ChartData: NSObject
         }
         else
         {
-            return _dataSets[highlight.dataSetIndex].entryForXIndex(highlight.xIndex)
+            // The value of the highlighted entry could be NaN - if we are not interested in highlighting a specific value.
+
+            let entries = _dataSets[highlight.dataSetIndex].entriesForXIndex(highlight.xIndex)
+            for e in entries
+            {
+                if e.value == highlight.value || isnan(highlight.value)
+                {
+                    return e
+                }
+            }
+
+            return nil
         }
     }
 

Charts/Classes/Data/Implementations/Standard/ChartDataSet.swift

@@ -152,6 +152,20 @@ public class ChartDataSet: ChartBaseDataSet
         else { return Double.NaN }
     }
 
+    /// - returns: all of the y values of the Entry objects at the given xIndex. Returns NaN if no value is at the given x-index.
+    public override func yValsForXIndex(x: Int) -> [Double]
+    {
+        let entries = self.entriesForXIndex(x)
+
+        var yVals = [Double]()
+        for e in entries
+        {
+            yVals.append(e.value)
+        }
+
+        return yVals
+    }
+
     /// - returns: the entry object found at the given index (not x-index!)
     /// - throws: out of bounds
     /// if `i` is out of bounds, it may throw an out-of-bounds exception
@@ -181,7 +195,9 @@ public class ChartDataSet: ChartBaseDataSet
         return entryForXIndex(x, rounding: .Closest)
     }
 
-    public func entriesForXIndex(x: Int) -> [ChartDataEntry]
+    /// - returns: all Entry objects found at the given xIndex with binary search.
+    /// An empty array if no Entry object at that index.
+    public override func entriesForXIndex(x: Int) -> [ChartDataEntry]
     {
         var entries = [ChartDataEntry]()
 
@@ -190,7 +206,7 @@ public class ChartDataSet: ChartBaseDataSet
 
         while (low <= high)
         {
-            var m = Int((high + low) / 2)
+            var m = (high + low) / 2
             var entry = _yVals[m]
 
             if (x == entry.xIndex)
@@ -215,15 +231,19 @@ public class ChartDataSet: ChartBaseDataSet
 
                     m += 1
                 }
-            }
-
-            if (x > _yVals[m].xIndex)
-            {
-                low = m + 1
+
+                break
             }
             else
             {
-                high = m - 1
+                if (x > _yVals[m].xIndex)
+                {
+                    low = m + 1
+                }
+                else
+                {
+                    high = m - 1
+                }
             }
         }
 

Charts/Classes/Data/Implementations/Standard/CombinedChartData.swift

@@ -177,7 +177,7 @@ public class CombinedChartData: BarLineScatterCandleBubbleChartData
             data.append(bubbleData)
         }
 
-        return data;
+        return data
     }
 
     public override func notifyDataChanged()
@@ -205,4 +205,41 @@ public class CombinedChartData: BarLineScatterCandleBubbleChartData
 
         super.notifyDataChanged() // recalculate everything
     }
+
+
+    /// Get the Entry for a corresponding highlight object
+    ///
+    /// - parameter highlight:
+    /// - returns: the entry that is highlighted
+    public override func getEntryForHighlight(highlight: ChartHighlight) -> ChartDataEntry?
+    {
+        let dataObjects = allData
+
+        if highlight.dataIndex >= dataObjects.count
+        {
+            return nil
+        }
+
+        let data = dataObjects[highlight.dataIndex]
+
+        if highlight.dataSetIndex >= data.dataSetCount
+        {
+            return nil
+        }
+        else
+        {
+            // The value of the highlighted entry could be NaN - if we are not interested in highlighting a specific value.
+
+            let entries = data.getDataSetByIndex(highlight.dataSetIndex).entriesForXIndex(highlight.xIndex)
+            for e in entries
+            {
+                if e.value == highlight.value || isnan(highlight.value)
+                {
+                    return e
+                }
+            }
+
+            return nil
+        }
+    }
 }

Charts/Classes/Data/Interfaces/IChartDataSet.swift

@@ -40,6 +40,9 @@ public protocol IChartDataSet
     /// - returns: the value of the Entry object at the given xIndex. Returns NaN if no value is at the given x-index.
     func yValForXIndex(x: Int) -> Double
 
+    /// - returns: all of the y values of the Entry objects at the given xIndex. Returns NaN if no value is at the given x-index.
+    func yValsForXIndex(x: Int) -> [Double]
+
     /// - returns: the entry object found at the given index (not x-index!)
     /// - throws: out of bounds
     /// if `i` is out of bounds, it may throw an out-of-bounds exception
@@ -55,6 +58,10 @@ public protocol IChartDataSet
     /// nil if no Entry object at that index.
     func entryForXIndex(x: Int) -> ChartDataEntry?
 
+    /// - returns: all Entry objects found at the given xIndex with binary search.
+    /// An empty array if no Entry object at that index.
+    func entriesForXIndex(x: Int) -> [ChartDataEntry]
+
     /// - returns: the array-index of the specified entry
     ///
     /// - parameter x: x-index of the entry to search for