Added feature to custom format all values in the chart with the Value…

…Formatter interface. General bugfixes.

MPChartExample/AndroidManifest.xml

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.xxmassdeveloper.mpchartexample"
-    android:versionCode="20"
-    android:versionName="1.6.1" >
+    android:versionCode="21"
+    android:versionName="1.6.2" >
 
     <uses-sdk
         android:minSdkVersion="8"

MPChartExample/build.gradle

@@ -7,8 +7,8 @@ android {
         applicationId 'com.xxmassdeveloper.mpchartexample'
         minSdkVersion 16
         targetSdkVersion 19
-        versionCode 20
-        versionName '1.6.1'
+        versionCode 21
+        versionName '1.6.2'
 
         sourceSets {
             main {

MPChartExample/src/com/xxmassdeveloper/mpchartexample/MyValueFormatter.java

@@ -0,0 +1,18 @@
+
+package com.xxmassdeveloper.mpchartexample;
+
+import com.github.mikephil.charting.utils.ValueFormatter;
+
+import java.text.DecimalFormat;
+
+public class MyValueFormatter implements ValueFormatter {
+
+    DecimalFormat mFormatter = new DecimalFormat("###,###,###");
+
+    @Override
+    public String getFormattedValue(float value) {
+        // do here whatever you want, avoid excessive calculations and memory
+        // allocations
+        return mFormatter.format(value);
+    }
+}

MPChartExample/src/com/xxmassdeveloper/mpchartexample/StackedBarActivity.java

@@ -66,10 +66,10 @@ protected void onCreate(Bundle savedInstanceState) {
         // drawn
         mChart.setMaxVisibleValueCount(60);
 
-        DecimalFormat f = new DecimalFormat("###,###,###");
+        MyValueFormatter customFormatter = new MyValueFormatter();
 
         // set a custom formatter for the values inside the chart
-        mChart.setValueFormatter(f);
+        mChart.setValueFormatter(customFormatter);
 
         // if false values are only drawn for the stack sum, else each value is drawn
         mChart.setDrawValuesForWholeStack(true);
@@ -85,6 +85,7 @@ protected void onCreate(Bundle savedInstanceState) {
         YLabels yLabels = mChart.getYLabels();
         yLabels.setPosition(YLabelPosition.BOTH_SIDED);
         yLabels.setLabelCount(5);
+        yLabels.setFormatter(customFormatter);
 
         XLabels xLabels = mChart.getXLabels();
         xLabels.setPosition(XLabelPosition.TOP);

MPChartLib/src/com/github/mikephil/charting/charts/BarChart.java

@@ -614,7 +614,7 @@ protected void drawValues() {
 
                         float val = entries.get(j / 2).getVal();
 
-                        drawValue(mValueFormat.format(val), valuePoints[j],
+                        drawValue(mValueFormatter.getFormattedValue(val), valuePoints[j],
                                 valuePoints[j + 1] + offset);
                     }
 
@@ -639,7 +639,7 @@ protected void drawValues() {
                         // in between
                         if (vals == null) {
 
-                            drawValue(mValueFormat.format(e.getVal()), valuePoints[j],
+                            drawValue(mValueFormatter.getFormattedValue(e.getVal()), valuePoints[j],
                                     valuePoints[j + 1] + offset);
 
                         } else {
@@ -659,7 +659,7 @@ protected void drawValues() {
 
                             for (int k = 0; k < transformed.length; k += 2) {
 
-                                drawValue(mValueFormat.format(vals[k / 2]), valuePoints[j],
+                                drawValue(mValueFormatter.getFormattedValue(vals[k / 2]), valuePoints[j],
                                         transformed[k + 1] + offset);
                             }
                         }

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

@@ -34,6 +34,7 @@
 import com.github.mikephil.charting.utils.MarkerView;
 import com.github.mikephil.charting.utils.SelInfo;
 import com.github.mikephil.charting.utils.Utils;
+import com.github.mikephil.charting.utils.ValueFormatter;
 import com.nineoldandroids.animation.ObjectAnimator;
 import com.nineoldandroids.animation.ValueAnimator;
 import com.nineoldandroids.animation.ValueAnimator.AnimatorUpdateListener;
@@ -70,8 +71,14 @@ public abstract class Chart<T extends ChartData<? extends DataSet<? extends Entr
      */
     private int mBackgroundColor = Color.WHITE;
 
-    /** the decimalformat responsible for formatting the values in the chart */
-    protected DecimalFormat mValueFormat = null;
+    /** custom formatter that is used instead of the auto-formatter if set */
+    protected ValueFormatter mValueFormatter = null;
+
+    /**
+     * flag that indicates if the default formatter should be used or if a
+     * custom one is set
+     */
+    private boolean mUseDefaultFormatter = true;
 
     /** chart offset to the left */
     protected float mOffsetLeft = 12;
@@ -327,7 +334,7 @@ protected void init() {
      * @param data
      */
     public void setData(T data) {
-        
+
         if (data == null || !data.isValid()) {
             Log.e(LOG_TAG,
                     "Cannot set data for chart. Provided chart values are null or contain less than 1 entry.");
@@ -398,8 +405,8 @@ protected void calcMinMax(boolean fixedValues) {
      */
     protected void calcFormats() {
 
-        // check if a custom formatter was set (then this flag is true)
-        if (!mUseCustomFormatter) {
+        // check if a custom formatter is set or not
+        if (mUseDefaultFormatter) {
 
             float reference = 0f;
 
@@ -419,7 +426,8 @@ protected void calcFormats() {
                 b.append("0");
             }
 
-            mValueFormat = new DecimalFormat("###,###,###,##0" + b.toString());
+            DecimalFormat formatter = new DecimalFormat("###,###,###,##0" + b.toString());
+            mValueFormatter = new DefaultValueFormatter(formatter);
         }
     }
 
@@ -1066,10 +1074,11 @@ protected void drawMarkers() {
                     continue;
 
                 float[] pos = getMarkerPosition(e, dataSetIndex);
-                
+
                 // check bounds
-                if(pos[0] < mOffsetLeft || pos[0] > getWidth() - mOffsetRight 
-                        || pos[1] < mOffsetTop || pos[1] > getHeight() - mOffsetBottom) continue;
+                if (pos[0] < mOffsetLeft || pos[0] > getWidth() - mOffsetRight
+                        || pos[1] < mOffsetTop || pos[1] > getHeight() - mOffsetBottom)
+                    continue;
 
                 // callbacks to update the content
                 mMarkerView.refreshContent(e, dataSetIndex);
@@ -1768,32 +1777,30 @@ public void setDrawMarkerViews(boolean enabled) {
         mDrawMarkerViews = enabled;
     }
 
-    private boolean mUseCustomFormatter = false;
-
     /**
      * Sets the formatter to be used for drawing the values inside the chart. If
-     * no formatter is set, the chart will automatically create one. To
-     * re-enable auto formatting after setting a custom formatter, call
-     * setValueFormatter(null).
+     * no formatter is set, the chart will automatically determine a reasonable
+     * formatting (concerning decimals) for all the values that are drawn inside
+     * the chart. Set this to NULL to re-enable auto formatting.
      * 
      * @param f
      */
-    public void setValueFormatter(DecimalFormat f) {
-        mValueFormat = f;
+    public void setValueFormatter(ValueFormatter f) {
+        mValueFormatter = f;
 
-        if (f != null)
-            mUseCustomFormatter = true;
+        if (f == null)
+            mUseDefaultFormatter = true;
         else
-            mUseCustomFormatter = false;
+            mUseDefaultFormatter = false;
     }
 
     /**
      * Returns the formatter used for drawing the values inside the chart.
      * 
      * @return
      */
-    public DecimalFormat getValueFormatter() {
-        return mValueFormat;
+    public ValueFormatter getValueFormatter() {
+        return mValueFormatter;
     }
 
     /**
@@ -2132,15 +2139,12 @@ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }
 
-    /** flag indicating if the matrix has alerady been prepared */
-    private boolean mMatrixOnLayoutPrepared = false;
-
     @Override
     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
         super.onLayout(changed, left, top, right, bottom);
-        
+
         prepareContentRect();
-        
+
         //
         // prepareContentRect();
         // Log.i(LOG_TAG,
@@ -2155,6 +2159,20 @@ protected void onSizeChanged(int w, int h, int oldw, int oldh) {
         super.onSizeChanged(w, h, oldw, oldh);
     }
 
+    private class DefaultValueFormatter implements ValueFormatter {
+
+        private DecimalFormat mFormat;
+
+        public DefaultValueFormatter(DecimalFormat f) {
+            mFormat = f;
+        }
+
+        @Override
+        public String getFormattedValue(float value) {
+            return mFormat.format(value);
+        }
+    }
+
     // @Override
     // protected void onAttachedToWindow() {
     // super.onAttachedToWindow();

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

@@ -309,12 +309,12 @@ protected void drawValues() {
 
                     if (mDrawUnitInChart) {
 
-                        mDrawCanvas.drawText(mValueFormat.format(val) + mUnit, positions[j],
+                        mDrawCanvas.drawText(mValueFormatter.getFormattedValue(val) + mUnit, positions[j],
                                 positions[j + 1]
                                         - valOffset, mValuePaint);
                     } else {
 
-                        mDrawCanvas.drawText(mValueFormat.format(val), positions[j],
+                        mDrawCanvas.drawText(mValueFormatter.getFormattedValue(val), positions[j],
                                 positions[j + 1] - valOffset,
                                 mValuePaint);
                     }

MPChartLib/src/com/github/mikephil/charting/charts/PieChart.java

@@ -463,9 +463,9 @@ protected void drawValues() {
                 float value = entries.get(j).getVal();
 
                 if (mUsePercentValues)
-                    val = mValueFormat.format(Math.abs(getPercentOfTotal(value))) + " %";
+                    val = mValueFormatter.getFormattedValue(Math.abs(getPercentOfTotal(value))) + " %";
                 else
-                    val = mValueFormat.format(value);
+                    val = mValueFormatter.getFormattedValue(value);
 
                 if (mDrawUnitInChart)
                     val = val + mUnit;

MPChartLib/src/com/github/mikephil/charting/charts/RadarChart.java

@@ -492,10 +492,10 @@ protected void drawValues() {
                     PointF p = getPosition(c, e.getVal() * factor, sliceangle * j + mRotationAngle);
 
                     if (mDrawUnitInChart)
-                        mDrawCanvas.drawText(mValueFormat.format(e.getVal()) + mUnit,
+                        mDrawCanvas.drawText(mValueFormatter.getFormattedValue(e.getVal()) + mUnit,
                                 p.x, p.y - yoffset, mValuePaint);
                     else
-                        mDrawCanvas.drawText(mValueFormat.format(e.getVal()),
+                        mDrawCanvas.drawText(mValueFormatter.getFormattedValue(e.getVal()),
                                 p.x, p.y - yoffset, mValuePaint);
                 }
             }

MPChartLib/src/com/github/mikephil/charting/charts/ScatterChart.java

@@ -144,11 +144,11 @@ protected void drawValues() {
 
                     if (mDrawUnitInChart) {
 
-                        mDrawCanvas.drawText(mValueFormat.format(val) + mUnit, positions[j],
+                        mDrawCanvas.drawText(mValueFormatter.getFormattedValue(val) + mUnit, positions[j],
                                 positions[j + 1] - shapeSize, mValuePaint);
                     } else {
 
-                        mDrawCanvas.drawText(mValueFormat.format(val), positions[j],
+                        mDrawCanvas.drawText(mValueFormatter.getFormattedValue(val), positions[j],
                                 positions[j + 1] - shapeSize,
                                 mValuePaint);
                     }

MPChartLib/src/com/github/mikephil/charting/utils/ValueFormatter.java

@@ -0,0 +1,23 @@
+
+package com.github.mikephil.charting.utils;
+
+/**
+ * Interface that allows custom formatting of all values and value-labels
+ * displayed inside the chart. Simply create your own formatting class and let
+ * it implement ValueFormatter. Then override the getFormattedLabel(...) method
+ * and return whatever you want.
+ * 
+ * @author Philipp Jahoda
+ */
+public interface ValueFormatter {
+
+    /**
+     * Called when a value (from labels, or inside the chart) is formatted
+     * before being drawn. For performance reasons, avoid excessive calculations
+     * and memory allocations inside this method.
+     * 
+     * @param value the value to be formatted
+     * @return the formatted label ready for being drawn
+     */
+    public String getFormattedValue(float value);
+}

MPChartLib/src/com/github/mikephil/charting/utils/YLabels.java

@@ -38,7 +38,7 @@ public class YLabels extends LabelBase {
     protected boolean mShowOnlyMinMax = false;
 
     /** the formatter used to customly format the y-labels */
-    private YLabelFormatter mFormatter = null;
+    private ValueFormatter mFormatter = null;
 
     /** the position of the y-labels relative to the chart */
     private YLabelPosition mPosition = YLabelPosition.LEFT;
@@ -151,7 +151,7 @@ public boolean isSeparateThousandsEnabled() {
      * 
      * @return
      */
-    public YLabelFormatter getFormatter() {
+    public ValueFormatter getFormatter() {
         return mFormatter;
     }
 
@@ -160,7 +160,7 @@ public YLabelFormatter getFormatter() {
      * 
      * @param f
      */
-    public void setFormatter(YLabelFormatter f) {
+    public void setFormatter(ValueFormatter f) {
         this.mFormatter = f;
     }
 
@@ -202,7 +202,7 @@ public String getFormattedLabel(int index) {
             text = Utils.formatNumber(mEntries[index], mDecimals,
                     isSeparateThousandsEnabled());
         else
-            text = getFormatter().getFormattedLabel(mEntries[index]);
+            text = getFormatter().getFormattedValue(mEntries[index]);
 
         return text;
     }