Improvements on piechart.

Author: PhilJay

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

@@ -94,7 +94,7 @@ protected void onCreate(Bundle savedInstanceState) {
 
         setData(3, 100);
 
-        mChart.animateY(1500, Easing.EasingOption.EaseInOutQuad);
+        mChart.animateY(1400, Easing.EasingOption.EaseInOutQuad);
         // mChart.spin(2000, 0, 360);
 
         Legend l = mChart.getLegend();
@@ -153,15 +153,15 @@ public boolean onOptionsItemSelected(MenuItem item) {
                 mChart.invalidate();
                 break;
             case R.id.animateX: {
-                mChart.animateX(1800);
+                mChart.animateX(1400);
                 break;
             }
             case R.id.animateY: {
-                mChart.animateY(1800);
+                mChart.animateY(1400);
                 break;
             }
             case R.id.animateXY: {
-                mChart.animateXY(1800, 1800);
+                mChart.animateXY(1400, 1400);
                 break;
             }
         }
@@ -196,7 +196,7 @@ private void setData(int count, float range) {
             xVals.add(mParties[i % mParties.length]);
 
         PieDataSet dataSet = new PieDataSet(yVals1, "Election Results");
-        dataSet.setSliceSpace(3f);
+        dataSet.setSliceSpace(2f);
         dataSet.setSelectionShift(5f);
 
         // add a lot of colors
@@ -244,6 +244,7 @@ private SpannableString generateCenterSpannableText() {
         s.setSpan(new ForegroundColorSpan(Color.GRAY), 14, s.length() - 15, 0);
         s.setSpan(new RelativeSizeSpan(.8f), 14, s.length() - 15, 0);
         s.setSpan(new StyleSpan(Typeface.ITALIC), s.length() - 14, s.length(), 0);
+        s.setSpan(new ForegroundColorSpan(ColorTemplate.getHoloBlue()), s.length() - 14, s.length(), 0);
         return s;
     }
 

MPChartExample/src/com/xxmassdeveloper/mpchartexample/fragments/PieChartFrag.java

@@ -1,7 +1,11 @@
 package com.xxmassdeveloper.mpchartexample.fragments;
+import android.graphics.Color;
 import android.graphics.Typeface;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
+import android.text.SpannableString;
+import android.text.style.ForegroundColorSpan;
+import android.text.style.RelativeSizeSpan;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -30,12 +34,12 @@ public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle sa
         Typeface tf = Typeface.createFromAsset(getActivity().getAssets(), "OpenSans-Light.ttf");
 
         mChart.setCenterTextTypeface(tf);
-        mChart.setCenterText("Revenues");
-        mChart.setCenterTextSize(22f);
+        mChart.setCenterText(generateCenterText());
+        mChart.setCenterTextSize(10f);
         mChart.setCenterTextTypeface(tf);
 
         // radius of the center hole in percent of maximum radius
-        mChart.setHoleRadius(45f); 
+        mChart.setHoleRadius(45f);
         mChart.setTransparentCircleRadius(50f);
 
         Legend l = mChart.getLegend();
@@ -45,4 +49,11 @@ public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle sa
 
         return v;
     }
+
+    private SpannableString generateCenterText() {
+        SpannableString s = new SpannableString("Revenues\nQuarters 2015");
+        s.setSpan(new RelativeSizeSpan(2f), 0, 8, 0);
+        s.setSpan(new ForegroundColorSpan(Color.GRAY), 8, s.length(), 0);
+        return s;
+    }
 }

MPChartExample/src/com/xxmassdeveloper/mpchartexample/fragments/SimpleFragment.java

@@ -113,7 +113,7 @@ protected PieData generatePieData() {
             entries1.add(new Entry((float) (Math.random() * 60) + 40, i));
         }
 
-        PieDataSet ds1 = new PieDataSet(entries1, "Quarterly Revenues 2014");
+        PieDataSet ds1 = new PieDataSet(entries1, "Quarterly Revenues 2015");
         ds1.setColors(ColorTemplate.VORDIPLOM_COLORS);
         ds1.setSliceSpace(2f);
         ds1.setValueTextColor(Color.WHITE);

MPChartExample/src/com/xxmassdeveloper/mpchartexample/listviewitems/PieChartItem.java

@@ -4,6 +4,9 @@
 import android.content.Context;
 import android.graphics.Color;
 import android.graphics.Typeface;
+import android.text.SpannableString;
+import android.text.style.ForegroundColorSpan;
+import android.text.style.RelativeSizeSpan;
 import android.view.LayoutInflater;
 import android.view.View;
 
@@ -13,16 +16,19 @@
 import com.github.mikephil.charting.data.ChartData;
 import com.github.mikephil.charting.data.PieData;
 import com.github.mikephil.charting.formatter.PercentFormatter;
+import com.github.mikephil.charting.utils.ColorTemplate;
 import com.xxmassdeveloper.mpchartexample.R;
 
 public class PieChartItem extends ChartItem {
 
     private Typeface mTf;
+    private SpannableString mCenterText;
 
     public PieChartItem(ChartData<?> cd, Context c) {
         super(cd);
 
         mTf = Typeface.createFromAsset(c.getAssets(), "OpenSans-Regular.ttf");
+        mCenterText = generateCenterText();
     }
 
     @Override
@@ -53,9 +59,9 @@ public View getView(int position, View convertView, Context c) {
         holder.chart.setDescription("");
         holder.chart.setHoleRadius(52f);
         holder.chart.setTransparentCircleRadius(57f);
-        holder.chart.setCenterText("MPChart\nAndroid");
+        holder.chart.setCenterText(mCenterText);
         holder.chart.setCenterTextTypeface(mTf);
-        holder.chart.setCenterTextSize(18f);
+        holder.chart.setCenterTextSize(9f);
         holder.chart.setUsePercentValues(true);
         holder.chart.setExtraOffsets(5, 10, 50, 10);
 
@@ -78,6 +84,17 @@ public View getView(int position, View convertView, Context c) {
         return convertView;
     }
 
+    private SpannableString generateCenterText() {
+        SpannableString s = new SpannableString("MPAndroidChart\ncreated by\nPhilipp Jahoda");
+        s.setSpan(new RelativeSizeSpan(1.6f), 0, 14, 0);
+        s.setSpan(new ForegroundColorSpan(ColorTemplate.VORDIPLOM_COLORS[0]), 0, 14, 0);
+        s.setSpan(new RelativeSizeSpan(.9f), 14, 25, 0);
+        s.setSpan(new ForegroundColorSpan(Color.GRAY), 14, 25, 0);
+        s.setSpan(new RelativeSizeSpan(1.4f), 25, s.length(), 0);
+        s.setSpan(new ForegroundColorSpan(ColorTemplate.getHoloBlue()), 25, s.length(), 0);
+        return s;
+    }
+
     private static class ViewHolder {
         PieChart chart;
     }

MPChartLib/src/com/github/mikephil/charting/renderer/PieChartRenderer.java

@@ -69,7 +69,7 @@ public PieChartRenderer(PieChart chart, ChartAnimator animator,
         mTransparentCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
         mTransparentCirclePaint.setColor(Color.WHITE);
         mTransparentCirclePaint.setStyle(Style.FILL);
-        mTransparentCirclePaint.setAlpha(100);
+        mTransparentCirclePaint.setAlpha(105);
 
         mCenterTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
         mCenterTextPaint.setColor(Color.BLACK);
@@ -266,19 +266,19 @@ protected void drawHole(Canvas c) {
 
             PointF center = mChart.getCenterCircleBox();
 
-            if (transparentCircleRadius > holeRadius && mAnimator.getPhaseX() >= 1f
-                    && mAnimator.getPhaseY() >= 1f) {
+            // only draw the circle if it can be seen (not covered by the hole)
+            if (transparentCircleRadius > holeRadius) {
 
-                //int color = mTransparentCirclePaint.getColor();
-
-                // make transparent
-                //mTransparentCirclePaint.setColor(color & 0x60FFFFFF);
+                // get original alpha
+                int alpha = mTransparentCirclePaint.getAlpha();
+                mTransparentCirclePaint.setAlpha((int) ((float) alpha * mAnimator.getPhaseX() * mAnimator.getPhaseY()));
 
                 // draw the transparent-circle
                 mBitmapCanvas.drawCircle(center.x, center.y,
                         radius / 100 * transparentCircleRadius, mTransparentCirclePaint);
 
-                //mTransparentCirclePaint.setColor(color);
+                // reset alpha
+                mTransparentCirclePaint.setAlpha(alpha);
             }
 
             // draw the hole-circle