Improvement on line graph views:

AndroidManifest.xml

@@ -22,6 +22,7 @@
         <activity android:name="CustomLabelFormatterActivity"></activity>
         <activity android:name="OwnModelAsData"></activity>
         <activity android:name="NegativeValuesGraph"></activity>
-
+        <activity android:name="com.jjoe64.graphviewdemos.dataselection.SampleSeriesDemoActivity"></activity>
+
     </application>
 </manifest>

res/layout/activity_garmin_series_demo.xml

@@ -0,0 +1,35 @@
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    tools:context=".SampleSeriesDemoActivity" >
+
+    <LinearLayout
+        android:id="@+id/linearLayout1"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+         >
+
+        <LinearLayout
+            android:id="@+id/graph1"
+            android:layout_width="fill_parent"
+            android:layout_height="fill_parent"
+            android:orientation="vertical"
+            android:layout_weight="1" />
+
+        <Spinner
+            android:layout_weight="1"
+            android:id="@+id/graphSeries"
+            android:layout_width="wrap_content"
+            android:layout_height="100dip"
+            android:layout_alignLeft="@+id/linearLayout1"
+            android:layout_below="@+id/linearLayout1"
+            android:layout_marginLeft="17dp" />
+    </LinearLayout>
+
+</RelativeLayout>

res/layout/main.xml

@@ -58,5 +58,10 @@
 			android:layout_height="wrap_content"
 			android:id="@+id/btn_negativevalues"
 			android:text="Negative Values" />
+		<Button
+			android:layout_width="fill_parent"
+			android:layout_height="wrap_content"
+			android:id="@+id/btn_sampleSelection"
+			android:text="Sample Selection" />
 	</LinearLayout>
 </ScrollView>

res/menu/garmin_series_demo.xml

@@ -0,0 +1,9 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android" >
+
+    <item
+        android:id="@+id/action_settings"
+        android:orderInCategory="100"
+        android:showAsAction="never"
+        android:title="@string/action_settings"/>
+
+</menu>

res/values-sw600dp/dimens.xml

@@ -0,0 +1,8 @@
+<resources>
+
+    <!--
+         Customize dimensions originally defined in res/values/dimens.xml (such as
+         screen margins) for sw600dp devices (e.g. 7" tablets) here.
+    -->
+
+</resources>

res/values-sw720dp-land/dimens.xml

@@ -0,0 +1,9 @@
+<resources>
+
+    <!--
+         Customize dimensions originally defined in res/values/dimens.xml (such as
+         screen margins) for sw720dp devices (e.g. 10" tablets) in landscape here.
+    -->
+    <dimen name="activity_horizontal_margin">128dp</dimen>
+
+</resources>

res/values/dimens.xml

@@ -0,0 +1,7 @@
+<resources>
+
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+
+</resources>

res/values/strings.xml

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+
     <string name="hello">Hello World, SimpleGraph!</string>
     <string name="app_name">GraphViewDemos</string>
+    <string name="title_activity_sample_series_demo">Data selection example</string>
+    <string name="action_settings">Settings</string>
+    <string name="hello_world">Hello world!</string>
+
 </resources>

src/com/jjoe64/graphviewdemos/ColorUtil.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2013 by Garmin Ltd. or its subsidiaries.
+ */
+
+package com.jjoe64.graphviewdemos;
+
+/**
+ * @author becze
+ *
+ */
+public class ColorUtil {
+    // ------------------------------------------------------------------------
+    // TYPES
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // STATIC FIELDS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // STATIC INITIALIZERS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // STATIC METHODS
+    // ------------------------------------------------------------------------
+
+    /**
+     * Changes the alpha component of the given color to the newAlpha value.
+     * @param color the input color
+     * @param newAlpha the alpha component between the values [0, 255]
+     * @return the new color
+     */
+    public static int changeColorAlpha(int color, int newAlpha) {
+
+        int mask = 0xFF;
+        int a = (color >> 24) & mask;
+        int r = (color >> 16) & mask;
+        int g = (color >> 8) & mask;
+        int b = color & mask;
+
+        // Put it all back in place
+        return (newAlpha << 24) + (r << 16) + (g << 8) + b;
+
+    }
+
+    // ------------------------------------------------------------------------
+    // FIELDS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // INITIALIZERS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // CONSTRUCTORS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // METHODS
+    // ------------------------------------------------------------------------
+}

src/com/jjoe64/graphviewdemos/MainActivity.java

@@ -1,5 +1,7 @@
 package com.jjoe64.graphviewdemos;
 
+import com.jjoe64.graphviewdemos.dataselection.SampleSeriesDemoActivity;
+
 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
@@ -69,6 +71,12 @@ public void onClick(View v) {
 				startGraphActivity(NegativeValuesGraph.class);
 			}
 		});
+		((Button) findViewById(R.id.btn_sampleSelection)).setOnClickListener(new OnClickListener() {
+		    @Override
+		    public void onClick(View v) {
+		        startGraphActivity(SampleSeriesDemoActivity.class);
+		    }
+		});
 	}
 
 	private void startGraphActivity(Class<? extends Activity> activity) {

src/com/jjoe64/graphviewdemos/dataselection/SampleGraphViewData.java

@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2013 by Garmin Ltd. or its subsidiaries.
+ */
+
+package com.jjoe64.graphviewdemos.dataselection;
+
+import com.jjoe64.graphview.GraphViewDataInterface;
+
+/**
+ * @author becze
+ */
+public class SampleGraphViewData implements GraphViewDataInterface {
+
+    // ------------------------------------------------------------------------
+    // TYPES
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // STATIC FIELDS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // STATIC INITIALIZERS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // STATIC METHODS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // FIELDS
+    // ------------------------------------------------------------------------
+    private double x;
+
+    private double y;
+
+
+    // The parent series where this data value belongs to.
+    private SampleGraphViewSeries parentSeries;
+
+    // ------------------------------------------------------------------------
+    // INITIALIZERS
+    // ------------------------------------------------------------------------
+
+    // ------------------------------------------------------------------------
+    // CONSTRUCTORS
+    // ------------------------------------------------------------------------
+    /**
+     * Makes a new sample.
+     *
+     * @param parentSeries the series where the data element will belong to.
+     * @param x the value on the x axes (horizontal axes)
+     * @param y the value on the y axes (the vertical axes)
+     */
+    public SampleGraphViewData(SampleGraphViewSeries parentSeries, double x, double y) {
+        this.parentSeries = parentSeries;
+        this.x = x;
+        this.y = y;
+    }
+
+    // ------------------------------------------------------------------------
+    // METHODS
+    // ------------------------------------------------------------------------
+    /**
+     * Just simply return the stored X value. We don't have to scale it.
+     *
+     * @return
+     * @see com.jjoe64.graphview.GraphViewDataInterface#getX()
+     */
+    @Override
+    public double getX() {
+        return x;
+    }
+
+    /**
+     * This value is scaled down to fit between the [-1, 1] interval. we will
+     * use the parent series max. value and min. value to determine it.
+     *
+     * @return
+     * @see com.jjoe64.graphview.GraphViewDataInterface#getY()
+     */
+    @Override
+    public double getY() {
+        return y/parentSeries.getMaxScaleSize();
+    }
+
+    /**
+     * Setter for Y
+     * @param y
+     */
+    public void setY(double y) {
+        this.y = y;
+    }
+}