Merge pull request #170 from AppDevNext/KotlinConversionLineChart

Kotlin conversion LineChart

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.java

@@ -0,0 +1,59 @@
+package com.github.mikephil.charting.charts
+
+import android.content.Context
+import android.util.AttributeSet
+import com.github.mikephil.charting.data.LineData
+import com.github.mikephil.charting.interfaces.dataprovider.LineDataProvider
+import com.github.mikephil.charting.renderer.LineChartRenderer
+import java.util.Locale
+
+class LineChart : BarLineChartBase<LineData?>, LineDataProvider {
+
+    constructor(context: Context?) : super(context)
+    constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)
+    constructor(context: Context?, attrs: AttributeSet?, defStyle: Int) : super(context, attrs, defStyle)
+
+    override fun init() {
+        super.init()
+        mRenderer = LineChartRenderer(this, mAnimator, mViewPortHandler)
+    }
+
+    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
+        if (mRenderer != null && mRenderer is LineChartRenderer) {
+            (mRenderer as LineChartRenderer).releaseBitmap()
+        }
+        super.onDetachedFromWindow()
+    }
+
+    override fun getAccessibilityDescription(): String {
+        val lineData = lineData
+        val numberOfPoints = lineData.entryCount
+
+        // Min and max values...
+        val yAxisValueFormatter = axisLeft.valueFormatter
+        val minVal = yAxisValueFormatter.getFormattedValue(lineData.yMin, null)
+        val maxVal = yAxisValueFormatter.getFormattedValue(lineData.yMax, null)
+
+        // Data range...
+        val xAxisValueFormatter = xAxis.valueFormatter
+        val minRange = xAxisValueFormatter.getFormattedValue(lineData.xMin, null)
+        val maxRange = xAxisValueFormatter.getFormattedValue(lineData.xMax, null)
+        val entries = if (numberOfPoints == 1) "entry" else "entries"
+        return String.format(
+            Locale.getDefault(), "The line chart has %d %s. " +
+                    "The minimum value is %s and maximum value is %s." +
+                    "Data ranges from %s to %s.",
+            numberOfPoints, entries, minVal, maxVal, minRange, maxRange
+        )
+    }
+}

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

@@ -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.java

@@ -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/BarLineScatterCandleBubbleDataProvider.kt

@@ -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;