maximal frequency of the data

app/src/main/java/org/isoron/uhabits/activities/common/views/FrequencyChart.java

@@ -66,6 +66,7 @@ public class FrequencyChart extends ScrollableChart
 
     @NonNull
     private HashMap<Long, Integer[]> frequency;
+    private int maxFreq;
 
     public FrequencyChart(Context context)
     {
@@ -90,9 +91,23 @@ public class FrequencyChart extends ScrollableChart
     public void setFrequency(HashMap<Long, Integer[]> frequency)
     {
         this.frequency = frequency;
+        maxFreq = getMaxFreq(frequency);
         postInvalidate();
     }
 
+    private int getMaxFreq(HashMap<Long, Integer[]> frequency)
+    {
+        int maxValue = 1;
+        for (Integer[] values : frequency.values())
+        {
+            for (Integer value : values)
+            {
+                maxValue = Math.max(value, maxValue);
+            }
+        }
+        return maxValue;
+    }
+
     public void setIsBackgroundTransparent(boolean isBackgroundTransparent)
     {
         this.isBackgroundTransparent = isBackgroundTransparent;
@@ -237,8 +252,8 @@ public class FrequencyChart extends ScrollableChart
         float padding = rect.height() * 0.2f;
         // maximal allowed mark radius
         float maxRadius = (rect.height() - 2 * padding) / 2.0f;
-        // the real mark radius is scaled down by a factor depending on the value
-        float scale = Math.min(value, 4) / 4.0f;
+        // the real mark radius is scaled down by a factor depending on the maximal frequency
+        float scale = 1.0f/maxFreq * value;
         float radius = maxRadius * scale;
 
         int colorIndex = Math.round((colors.length-1) * scale);