More Kotlin conversions

Author: hannesa2

MPChartLib/src/main/java/com/github/mikephil/charting/charts/Chart.java

@@ -53,6 +53,8 @@
 import java.io.OutputStream;
 import java.util.ArrayList;
 
+import androidx.annotation.NonNull;
+
 /**
  * Baseclass of all Chart-Views.
  *
@@ -1311,6 +1313,7 @@ public void setDrawMarkers(boolean enabled) {
 	/**
 	 * Returns the ChartData object that has been set for the chart.
 	 */
+	@NonNull
 	public T getData() {
 		return mData;
 	}

MPChartLib/src/main/java/com/github/mikephil/charting/charts/LineChart.kt

@@ -18,13 +18,14 @@ class LineChart : BarLineChartBase<LineData?>, LineDataProvider {
         mRenderer = LineChartRenderer(this, mAnimator, mViewPortHandler)
     }
 
-    override fun getLineData(): LineData {
-        mData?.let {
-            return it
-        } ?: run {
-            return LineData()
+    override val lineData: LineData
+        get() {
+            mData?.let {
+                return it
+            } ?: run {
+                return LineData()
+            }
         }
-    }
 
     public override fun onDetachedFromWindow() {
         // releases the bitmap in the renderer to avoid oom error

MPChartLib/src/main/java/com/github/mikephil/charting/interfaces/dataprovider/BarLineScatterCandleBubbleDataProvider.java

@@ -0,0 +1,13 @@
+package com.github.mikephil.charting.interfaces.dataprovider
+
+import com.github.mikephil.charting.components.YAxis.AxisDependency
+import com.github.mikephil.charting.data.BarLineScatterCandleBubbleData
+import com.github.mikephil.charting.utils.Transformer
+
+interface BarLineScatterCandleBubbleDataProvider : ChartInterface {
+    fun getTransformer(axis: AxisDependency?): Transformer?
+    fun isInverted(axis: AxisDependency?): Boolean
+    val lowestVisibleX: Float
+    val highestVisibleX: Float
+    override fun getData(): BarLineScatterCandleBubbleData<*>
+}

MPChartLib/src/main/java/com/github/mikephil/charting/interfaces/dataprovider/BarLineScatterCandleBubbleDataProvider.kt

@@ -0,0 +1,10 @@
+package com.github.mikephil.charting.interfaces.dataprovider
+
+import com.github.mikephil.charting.components.YAxis
+import com.github.mikephil.charting.components.YAxis.AxisDependency
+import com.github.mikephil.charting.data.LineData
+
+interface LineDataProvider : BarLineScatterCandleBubbleDataProvider {
+    val lineData: LineData
+    fun getAxis(dependency: AxisDependency): YAxis?
+}

MPChartLib/src/main/java/com/github/mikephil/charting/interfaces/dataprovider/LineDataProvider.java

@@ -629,12 +629,12 @@ public void drawExtras(Canvas c) {
     /**
      * cache for the circle bitmaps of all datasets
      */
-    private HashMap<IDataSet, DataSetImageCache> mImageCaches = new HashMap<>();
+    private final HashMap<IDataSet, DataSetImageCache> mImageCaches = new HashMap<>();
 
     /**
      * buffer for drawing the circles
      */
-    private float[] mCirclesBuffer = new float[2];
+    private final float[] mCirclesBuffer = new float[2];
 
     protected void drawCircles(Canvas c) {
 
@@ -782,7 +782,7 @@ public void releaseBitmap() {
 
     private class DataSetImageCache {
 
-        private Path mCirclePathBuffer = new Path();
+        private final Path mCirclePathBuffer = new Path();
 
         private Bitmap[] circleBitmaps;