Merge pull request #347 from AppDevNext/HorizontalBarBufferKotlin

HorizontalBarBuffer Kotlin

Author: hannesa2

MPChartLib/src/main/java/com/github/mikephil/charting/buffer/HorizontalBarBuffer.java

@@ -0,0 +1,85 @@
+package com.github.mikephil.charting.buffer
+
+import com.github.mikephil.charting.interfaces.datasets.IBarDataSet
+import kotlin.math.abs
+
+class HorizontalBarBuffer(size: Int, dataSetCount: Int, containsStacks: Boolean) : BarBuffer(size, dataSetCount, containsStacks) {
+    override fun feed(data: IBarDataSet?) {
+        val size = (data?.entryCount ?: 0) * phaseX
+        val barWidthHalf = barWidth / 2f
+
+        var i = 0
+        while (i < size) {
+            val e = data?.getEntryForIndex(i)
+
+            if (e == null) {
+                i++
+                continue
+            }
+
+            val x = e.x
+            var y = e.y
+            val vals = e.yVals
+
+            if (!containsStacks || vals == null) {
+                val bottom = x - barWidthHalf
+                val top = x + barWidthHalf
+                var left: Float
+                var right: Float
+                if (inverted) {
+                    left = if (y >= 0) y else 0f
+                    right = if (y <= 0) y else 0f
+                } else {
+                    right = if (y >= 0) y else 0f
+                    left = if (y <= 0) y else 0f
+                }
+
+                // multiply the height of the rect with the phase
+                if (right > 0) right *= phaseY
+                else left *= phaseY
+
+                addBar(left, top, right, bottom)
+            } else {
+                var posY = 0f
+                var negY = -e.negativeSum
+                var yStart: Float
+
+                // fill the stack
+                for (k in vals.indices) {
+                    val value = vals[k]
+
+                    if (value >= 0f) {
+                        y = posY
+                        yStart = posY + value
+                        posY = yStart
+                    } else {
+                        y = negY
+                        yStart = (negY + abs(value.toDouble())).toFloat()
+                        negY += abs(value.toDouble()).toFloat()
+                    }
+
+                    val bottom = x - barWidthHalf
+                    val top = x + barWidthHalf
+                    var left: Float
+                    var right: Float
+                    if (inverted) {
+                        left = if (y >= yStart) y else yStart
+                        right = if (y <= yStart) y else yStart
+                    } else {
+                        right = if (y >= yStart) y else yStart
+                        left = if (y <= yStart) y else yStart
+                    }
+
+                    // multiply the height of the rect with the phase
+                    right *= phaseY
+                    left *= phaseY
+
+                    addBar(left, top, right, bottom)
+                }
+            }
+            i++
+        }
+
+        reset()
+    }
+}

MPChartLib/src/main/java/com/github/mikephil/charting/buffer/HorizontalBarBuffer.kt

@@ -18,7 +18,8 @@ import kotlin.math.ceil
 import kotlin.math.min
 
 open class BarChartRenderer(
-    @JvmField var chart: BarDataProvider, animator: ChartAnimator?,
+    @JvmField var chart: BarDataProvider,
+    animator: ChartAnimator?,
     viewPortHandler: ViewPortHandler?
 ) : BarLineScatterCandleBubbleRenderer(animator, viewPortHandler) {
     /**