Merge pull request #1 from sembozdemir/pie_chart_min_angle

Add option for setting min angle for pie slices
sembozdemir · Mar 28, 2018 · c2bc2a9 · c2bc2a9
2 parents 3e1eb14 + 4b6d4b6
commit c2bc2a9
Showing 1 changed file with 36 additions and 1 deletion.
diff --git a/MPChartLib/src/main/java/com/github/mikephil/charting/charts/PieChart.java b/MPChartLib/src/main/java/com/github/mikephil/charting/charts/PieChart.java
@@ -94,6 +94,8 @@ public class PieChart extends PieRadarChartBase<PieData> {
 
     protected float mMaxAngle = 360f;
 
+    private float mMinAngleForSlices = 0f;
+
     public PieChart(Context context) {
         super(context);
     }
@@ -236,7 +238,19 @@ private void calcAngles() {
 
             for (int j = 0; j < set.getEntryCount(); j++) {
 
-                mDrawAngles[cnt] = calcAngle(Math.abs(set.getEntryForIndex(j).getY()), yValueSum);
+                float drawAngle = calcAngle(Math.abs(set.getEntryForIndex(j).getY()), yValueSum);
+
+                final boolean hasMinAngle = mMinAngleForSlices != 0f;
+                if (hasMinAngle) {
+                    drawAngle = Math.max(drawAngle, mMinAngleForSlices);
+
+                    if (cnt != 0 && cnt == set.getEntryCount() - 1) { // if it is the last slice
+                        // drawAngle should be the rest of space
+                        drawAngle = mMaxAngle - mAbsoluteAngles[cnt - 1];
+                    }
+                }
+
+                mDrawAngles[cnt] = drawAngle;
 
                 if (cnt == 0) {
                     mAbsoluteAngles[cnt] = mDrawAngles[cnt];
@@ -719,6 +733,27 @@ public void setMaxAngle(float maxangle) {
         this.mMaxAngle = maxangle;
     }
 
+    public float getMinAngleForSlices() {
+        return mMinAngleForSlices;
+    }
+
+    /**
+     * Set the angle to set minimum size for slices (e.g 18f means 5% min percentage for full pie-chart).
+     * do not use huge values for this, it will break pie-chart. Default: 0f
+     *
+     * @param minAngle min 0, max 360
+     */
+    public void setMinAngleForSlices(float minAngle) {
+
+        if (minAngle > 360)
+            minAngle = 360f;
+
+        if (minAngle < 0)
+            minAngle = 0f;
+
+        this.mMinAngleForSlices = minAngle;
+    }
+
     @Override
     protected void onDetachedFromWindow() {
         // releases the bitmap in the renderer to avoid oom error