Added highlightColor parameter for pie charts

ChartsOrg/Charts#2961

Author: danielgindi

MPChartLib/src/main/java/com/github/mikephil/charting/data/PieDataSet.java

@@ -3,6 +3,7 @@
 
 import com.github.mikephil.charting.interfaces.datasets.IPieDataSet;
 import com.github.mikephil.charting.utils.Utils;
+import android.support.annotation.Nullable;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -29,6 +30,7 @@ public class PieDataSet extends DataSet<PieEntry> implements IPieDataSet {
     private float mValueLinePart1Length = 0.3f;
     private float mValueLinePart2Length = 0.4f;
     private boolean mValueLineVariableLength = true;
+    private Integer mHighlightColor = null;
 
     public PieDataSet(List<PieEntry> yVals, String label) {
         super(yVals, label);
@@ -218,6 +220,21 @@ public void setValueLineVariableLength(boolean valueLineVariableLength) {
         this.mValueLineVariableLength = valueLineVariableLength;
     }
 
+    /** Gets the color for the highlighted sector */
+    @Override
+    @Nullable
+    public Integer getHighlightColor()
+    {
+        return mHighlightColor;
+    }
+
+    /** Sets the color for the highlighted sector (null for using entry color) */
+    public void setHighlightColor(@Nullable Integer color)
+    {
+        this.mHighlightColor = color;
+    }
+
+
     public enum ValuePosition {
         INSIDE_SLICE,
         OUTSIDE_SLICE

MPChartLib/src/main/java/com/github/mikephil/charting/interfaces/datasets/IPieDataSet.java

@@ -1,5 +1,7 @@
 package com.github.mikephil.charting.interfaces.datasets;
 
+import android.support.annotation.Nullable;
+
 import com.github.mikephil.charting.data.PieDataSet;
 import com.github.mikephil.charting.data.PieEntry;
 
@@ -70,5 +72,11 @@ public interface IPieDataSet extends IDataSet<PieEntry> {
      * */
     boolean isValueLineVariableLength();
 
+    /**
+     * Gets the color for the highlighted sector
+     * */
+    @Nullable
+    Integer getHighlightColor();
+
 }
 

MPChartLib/src/main/java/com/github/mikephil/charting/renderer/PieChartRenderer.java

@@ -857,7 +857,10 @@ public void drawHighlighted(Canvas c, Highlight[] indices) {
 
             final boolean accountForSliceSpacing = sliceSpace > 0.f && sliceAngle <= 180.f;
 
-            mRenderPaint.setColor(set.getColor(index));
+            Integer highlightColor = set.getHighlightColor();
+            if (highlightColor == null)
+                highlightColor = set.getColor(index);
+            mRenderPaint.setColor(highlightColor);
 
             final float sliceSpaceAngleOuter = visibleAngleCount == 1 ?
                     0.f :