Kotlin formatter

Author: hannesa2

MPChartLib/src/main/java/com/github/mikephil/charting/formatter/DefaultAxisValueFormatter.java

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+package com.github.mikephil.charting.formatter
+
+import com.github.mikephil.charting.components.AxisBase
+import java.text.DecimalFormat
+
+open class DefaultAxisValueFormatter(digits: Int) : IAxisValueFormatter {
+    /**
+     * decimal format for formatting
+     */
+    protected var decimalFormat: DecimalFormat
+    /**
+     * Returns the number of decimal digits this formatter uses or -1, if unspecified.
+     */
+    /**
+     * the number of decimal digits this formatter uses
+     */
+    var decimalDigits = 0
+        protected set
+
+    /**
+     * Constructor that specifies to how many digits the value should be
+     * formatted.
+     */
+    init {
+        decimalDigits = digits
+        val b = StringBuffer()
+        for (i in 0 until digits) {
+            if (i == 0) b.append(".")
+            b.append("0")
+        }
+        decimalFormat = DecimalFormat("###,###,###,##0$b")
+    }
+
+    override fun getFormattedValue(value: Float, axis: AxisBase?): String? {
+        // avoid memory allocations here (for performance)
+        return decimalFormat.format(value.toDouble())
+    }
+}

MPChartLib/src/main/java/com/github/mikephil/charting/formatter/DefaultAxisValueFormatter.kt

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+package com.github.mikephil.charting.formatter
+
+import com.github.mikephil.charting.interfaces.dataprovider.LineDataProvider
+import com.github.mikephil.charting.interfaces.datasets.ILineDataSet
+
+/**
+ * Default formatter that calculates the position of the filled line.
+ */
+open class DefaultFillFormatter : IFillFormatter {
+
+    override fun getFillLinePosition(dataSet: ILineDataSet?, dataProvider: LineDataProvider?): Float {
+        val fillMin: Float
+        val chartMaxY = dataProvider!!.yChartMax
+        val chartMinY = dataProvider.yChartMin
+        val data = dataProvider.lineData
+        fillMin = if (dataSet!!.yMax > 0 && dataSet.yMin < 0) {
+            0f
+        } else {
+            val max: Float = if (data.yMax > 0) 0f else chartMaxY
+            val min: Float = if (data.yMin < 0) 0f else chartMinY
+            if (dataSet.yMin >= 0)
+                min
+            else
+                max
+        }
+        return fillMin
+    }
+}

MPChartLib/src/main/java/com/github/mikephil/charting/formatter/DefaultFillFormatter.java

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+package com.github.mikephil.charting.formatter
+
+import com.github.mikephil.charting.data.Entry
+import com.github.mikephil.charting.utils.ViewPortHandler
+import java.text.DecimalFormat
+
+/**
+ * Default formatter used for formatting values inside the chart. Uses a DecimalFormat with
+ * pre-calculated number of digits (depending on max and min value).
+ */
+open class DefaultValueFormatter(digits: Int) : IValueFormatter {
+    /**
+     * DecimalFormat for formatting
+     */
+    protected var decimalFormat: DecimalFormat? = null
+
+    /**
+     * Returns the number of decimal digits this formatter uses.
+     *
+     * @return
+     */
+    var decimalDigits = 0
+        protected set
+
+    /**
+     * Constructor that specifies to how many digits the value should be formatted.
+     */
+    init {
+        setup(digits)
+    }
+
+    /**
+     * Sets up the formatter with a given number of decimal digits.
+     *
+     * @param digits
+     */
+    fun setup(digits: Int) {
+        decimalDigits = digits
+        val b = StringBuffer()
+        for (i in 0 until digits) {
+            if (i == 0) b.append(".")
+            b.append("0")
+        }
+        decimalFormat = DecimalFormat("###,###,###,##0$b")
+    }
+
+    override fun getFormattedValue(value: Float, entry: Entry?, dataSetIndex: Int, viewPortHandler: ViewPortHandler?): String? {
+
+        // put more logic here ...
+        // avoid memory allocations here (for performance reasons)
+        return decimalFormat!!.format(value.toDouble())
+    }
+}