Added Point Graph limit option.

build.gradle

@@ -1,6 +1,7 @@
 buildscript {
     repositories {
         mavenCentral()
+        jcenter()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.2.3'

src/main/java/com/jjoe64/graphview/series/PointsGraphSeries.java

@@ -93,6 +93,11 @@ private final class Styles {
         Shape shape;
     }
 
+    /**
+     * Sets the limit for highest value to turn red
+     */
+    private double LIMIT;
+
     /**
      * wrapped styles
      */
@@ -222,7 +227,13 @@ public void draw(GraphView graphView, Canvas canvas, boolean isSecondScale) {
                 if (mCustomShape != null) {
                     mCustomShape.draw(canvas, mPaint, endX, endY, value);
                 } else if (mStyles.shape == Shape.POINT) {
-                    canvas.drawCircle(endX, endY, mStyles.size, mPaint);
+                    if (value.getY() >= LIMIT) {
+                        mPaint.setColor(Color.RED);
+                        canvas.drawCircle(endX, endY, mStyles.size, mPaint);
+                        mPaint.setColor(getColor());
+                    } else {
+                        canvas.drawCircle(endX, endY, mStyles.size, mPaint);
+                    }
                 } else if (mStyles.shape == Shape.RECTANGLE) {
                     canvas.drawRect(endX-mStyles.size, endY-mStyles.size, endX+mStyles.size, endY+mStyles.size, mPaint);
                 } else if (mStyles.shape == Shape.TRIANGLE) {
@@ -301,6 +312,16 @@ public void setShape(Shape s) {
         mStyles.shape = s;
     }
 
+    /**
+     * This sets the limit of the data points,
+     * changing data points above the LIMIT to red.
+     *
+     * @param limitIn limit to be set
+     */
+    public void setLimit(double limitIn) {
+        LIMIT = limitIn;
+    }
+
     /**
      * Use a custom handler to draw your own
      * drawing for each data point.