feat: Add gradient highlight radar indicator to LineScatterCandleRadarChartDat…

Source/Charts/Charts/LineChartView.swift

@@ -26,3 +26,12 @@ open class LineChartView: BarLineChartViewBase, LineChartDataProvider
 
     open var lineData: LineChartData? { return data as? LineChartData }
 }
+
+extension LineChartView {
+
+    public final func setChartMinMaxYValues(chartYMin: Double, chartYMax: Double) {
+        let leftAxis = self.leftAxis
+        leftAxis.axisMaximum = chartYMax
+        leftAxis.axisMinimum = chartYMin
+    }
+}

Source/Charts/Data/Implementations/Standard/LineScatterCandleRadarChartDataSet.swift

@@ -23,12 +23,24 @@ open class LineScatterCandleRadarChartDataSet: BarLineScatterCandleBubbleChartDa
 
     /// Enables / disables the vertical highlight-indicator. If disabled, the indicator is not drawn.
     open var drawVerticalHighlightIndicatorEnabled = true
+
+    /// Enables / disables the horizontal radar highlight-indicator. If disabled, the indicator is not drawn.
+    open var drawHorizontalHighlightRadarIndicatorEnabled = true
+
+    /// Enables / disables the vertical radar highlight-indicator. If disabled, the indicator is not drawn.
+    open var drawVerticalHighlightRadarIndicatorEnabled = true
 
     /// `true` if horizontal highlight indicator lines are enabled (drawn)
     open var isHorizontalHighlightIndicatorEnabled: Bool { return drawHorizontalHighlightIndicatorEnabled }
 
     /// `true` if vertical highlight indicator lines are enabled (drawn)
     open var isVerticalHighlightIndicatorEnabled: Bool { return drawVerticalHighlightIndicatorEnabled }
+
+    /// `true` if horizontal highlight radar indicator lines are enabled (drawn)
+    open var isHorizontalHighlightRadarIndicatorEnabled: Bool { return drawHorizontalHighlightRadarIndicatorEnabled }
+
+    /// `true` if vertical highlight radar indicator lines are enabled (drawn)
+    open var isVerticalHighlightRadarIndicatorEnabled: Bool { return drawVerticalHighlightRadarIndicatorEnabled }
 
     /// Enables / disables both vertical and horizontal highlight-indicators.
     /// :param: enabled
@@ -37,6 +49,15 @@ open class LineScatterCandleRadarChartDataSet: BarLineScatterCandleBubbleChartDa
         drawHorizontalHighlightIndicatorEnabled = enabled
         drawVerticalHighlightIndicatorEnabled = enabled
     }
+
+    /// Enables / disables both vertical and horizontal radar highlight-indicators.
+    /// :param: enabled
+    open func setDrawHighlightRadarIndicators(_ enabled: Bool) {
+        drawHorizontalHighlightIndicatorEnabled = enabled
+        drawVerticalHighlightIndicatorEnabled = enabled
+        drawHorizontalHighlightRadarIndicatorEnabled = enabled
+        drawVerticalHighlightRadarIndicatorEnabled = enabled
+    }
 
     // MARK: NSCopying
 
@@ -45,6 +66,8 @@ open class LineScatterCandleRadarChartDataSet: BarLineScatterCandleBubbleChartDa
         let copy = super.copy(with: zone) as! LineScatterCandleRadarChartDataSet
         copy.drawHorizontalHighlightIndicatorEnabled = drawHorizontalHighlightIndicatorEnabled
         copy.drawVerticalHighlightIndicatorEnabled = drawVerticalHighlightIndicatorEnabled
+        copy.drawHorizontalHighlightRadarIndicatorEnabled = drawHorizontalHighlightRadarIndicatorEnabled
+        copy.drawVerticalHighlightRadarIndicatorEnabled = drawVerticalHighlightRadarIndicatorEnabled
         return copy
     }
 

Source/Charts/Data/Interfaces/LineScatterCandleRadarChartDataSetProtocol.swift

@@ -23,14 +23,30 @@ public protocol LineScatterCandleRadarChartDataSetProtocol: BarLineScatterCandle
 
     /// Enables / disables the vertical highlight-indicator. If disabled, the indicator is not drawn.
     var drawVerticalHighlightIndicatorEnabled: Bool { get set }
+
+    /// Enables / disables the horizontal radar highlight-indicator. If disabled, the indicator is not drawn.
+    var drawHorizontalHighlightRadarIndicatorEnabled: Bool { get set }
+
+    /// Enables / disables the vertical radar highlight-indicator. If disabled, the indicator is not drawn.
+    var drawVerticalHighlightRadarIndicatorEnabled: Bool { get set }
 
     /// `true` if horizontal highlight indicator lines are enabled (drawn)
     var isHorizontalHighlightIndicatorEnabled: Bool { get }
 
     /// `true` if vertical highlight indicator lines are enabled (drawn)
     var isVerticalHighlightIndicatorEnabled: Bool { get }
+
+    /// `true` if horizontal highlight radar indicator lines are enabled (drawn)
+    var isHorizontalHighlightRadarIndicatorEnabled: Bool { get }
+
+    /// `true` if vertical highlight radar indicator lines are enabled (drawn)
+    var isVerticalHighlightRadarIndicatorEnabled: Bool { get }
 
     /// Enables / disables both vertical and horizontal highlight-indicators.
     /// :param: enabled
     func setDrawHighlightIndicators(_ enabled: Bool)
+
+    /// Enables / disables both vertical and horizontal radar highlight-indicators.
+    /// :param: enabled
+    func setDrawHighlightRadarIndicators(_ enabled: Bool)
 }

Source/Charts/Renderers/LineScatterCandleRadarRenderer.swift

@@ -11,6 +11,7 @@
 
 import Foundation
 import CoreGraphics
+import UIKit
 
 @objc(LineScatterCandleRadarChartRenderer)
 open class LineScatterCandleRadarRenderer: BarLineScatterCandleBubbleRenderer
@@ -32,6 +33,22 @@ open class LineScatterCandleRadarRenderer: BarLineScatterCandleBubbleRenderer
         if set.isVerticalHighlightIndicatorEnabled
         {
             context.beginPath()
+
+            if set.isVerticalHighlightRadarIndicatorEnabled {
+                let colorTop = UIColor.white.cgColor
+                let colorBottom = UIColor.clear.cgColor
+
+                var gradientOne = CGGradient(colorsSpace: .none, colors: [colorTop, colorBottom] as CFArray, locations: [0.0, 1.0])!
+                let startPointOne = CGPoint(x: point.x, y: point.y)
+                let endPointOne = CGPoint(x: point.x, y: viewPortHandler.contentBottom)
+                context.drawRadialGradient(gradientOne, startCenter: startPointOne, startRadius: 0.5, endCenter: endPointOne, endRadius: 0.5, options: .drawsAfterEndLocation)
+
+                var gradientTwo = CGGradient(colorsSpace: .none, colors: [colorBottom, colorTop] as CFArray, locations: [0.0, 1.0])!
+                let startPointTwo = CGPoint(x: point.x, y: viewPortHandler.contentTop)
+                let endPointTwo = CGPoint(x: point.x, y: point.y)
+                context.drawRadialGradient(gradientTwo, startCenter: startPointTwo, startRadius: 0.5, endCenter: endPointTwo, endRadius: 0.5, options: .drawsBeforeStartLocation)
+            }
+
             context.move(to: CGPoint(x: point.x, y: viewPortHandler.contentTop))
             context.addLine(to: CGPoint(x: point.x, y: viewPortHandler.contentBottom))
             context.strokePath()
@@ -41,6 +58,22 @@ open class LineScatterCandleRadarRenderer: BarLineScatterCandleBubbleRenderer
         if set.isHorizontalHighlightIndicatorEnabled
         {
             context.beginPath()
+
+            if set.isHorizontalHighlightRadarIndicatorEnabled {
+                let colorTop = UIColor.white.cgColor
+                let colorBottom = UIColor.clear.cgColor
+
+                var gradientOne = CGGradient(colorsSpace: .none, colors: [colorBottom, colorTop] as CFArray, locations: [0.0, 1.0])!
+                let startPointOne = CGPoint(x: viewPortHandler.contentLeft, y: point.y)
+                let endPointOne = CGPoint(x: point.x, y: point.y)
+                context.drawRadialGradient(gradientOne, startCenter: startPointOne, startRadius: 0.5, endCenter: endPointOne, endRadius: 0.5, options: .drawsBeforeStartLocation)
+
+                var gradientTwo = CGGradient(colorsSpace: .none, colors: [colorBottom, colorTop] as CFArray, locations: [0.0, 1.0])!
+                let startPointTwo = CGPoint(x: viewPortHandler.contentRight, y: point.y)
+                let endPointTwo = CGPoint(x: point.x, y: point.y)
+                context.drawRadialGradient(gradientTwo, startCenter: startPointTwo, startRadius: 0.5, endCenter: endPointTwo, endRadius: 0.5, options: .drawsBeforeStartLocation)
+            }
+
             context.move(to: CGPoint(x: viewPortHandler.contentLeft, y: point.y))
             context.addLine(to: CGPoint(x: viewPortHandler.contentRight, y: point.y))
             context.strokePath()