From 0063f193ff80d34d3a37672725b9383e70b1d578 Mon Sep 17 00:00:00 2001
From: serso <se.solovyev@gmail.com>
Date: Mon, 18 Jul 2011 00:29:54 +0400
Subject: [PATCH] drag button calibration

---
 AndroidManifest.xml                           |   1 +
 gen/org/solovyev/android/calculator/R.java    |  67 ++--
 res/drawable/down.png                         | Bin 0 -> 2413 bytes
 res/drawable/not_ok.png                       | Bin 0 -> 9286 bytes
 res/drawable/ok.png                           | Bin 0 -> 9774 bytes
 res/drawable/up.png                           | Bin 0 -> 2792 bytes
 res/layout/drag_button_calibration.xml        |  27 +-
 res/layout/main.xml                           |  48 +--
 .../calculator/CalculatorActivity.java        |  54 +++-
 .../DragButtonCalibrationActivity.java        | 289 ++++++++++++++++--
 .../android/view/DirectionDragButton.java     |  99 ++++++
 src/org/solovyev/android/view/DragButton.java |  84 +----
 .../android/view/SimpleOnDragListener.java    |  67 ++--
 src/org/solovyev/util/math/MathUtils.java     |  31 ++
 14 files changed, 557 insertions(+), 210 deletions(-)
 create mode 100644 res/drawable/down.png
 create mode 100644 res/drawable/not_ok.png
 create mode 100644 res/drawable/ok.png
 create mode 100644 res/drawable/up.png
 create mode 100644 src/org/solovyev/android/view/DirectionDragButton.java

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 0fa5d311..c18c9208 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -13,6 +13,7 @@
             <intent-filter>
                 <action a:name="android.intent.action.MAIN" />
                 <category a:name="android.intent.category.LAUNCHER" />
+				<action a:name="org.solovyev.android.calculator.DragButtonPreferencesChanged"/>
             </intent-filter>
         </activity>
 
diff --git a/gen/org/solovyev/android/calculator/R.java b/gen/org/solovyev/android/calculator/R.java
index 33366b49..be166f9d 100644
--- a/gen/org/solovyev/android/calculator/R.java
+++ b/gen/org/solovyev/android/calculator/R.java
@@ -27,39 +27,44 @@ containing a value of this type.
         public static final int textUp=0x7f010000;
     }
     public static final class drawable {
-        public static final int icon=0x7f020000;
+        public static final int down=0x7f020000;
+        public static final int icon=0x7f020001;
+        public static final int not_ok=0x7f020002;
+        public static final int ok=0x7f020003;
+        public static final int up=0x7f020004;
     }
     public static final class id {
-        public static final int calibrationButton=0x7f080000;
-        public static final int calibrationStart=0x7f080001;
-        public static final int curlyBracketsButton=0x7f080015;
-        public static final int editText=0x7f080002;
-        public static final int eigthDigitButton=0x7f080011;
-        public static final int equalsButton=0x7f080013;
-        public static final int fiveDigitButton=0x7f08000b;
-        public static final int fourDigitButton=0x7f08000a;
-        public static final int historyButton=0x7f08001a;
-        public static final int menu_item_help=0x7f08001d;
-        public static final int menu_item_settings=0x7f08001c;
-        public static final int minusButton=0x7f08000e;
-        public static final int muliplicationButton=0x7f080007;
-        public static final int nineDigitButton=0x7f080012;
-        public static final int numericButton=0x7f080018;
-        public static final int oneDigitButton=0x7f080004;
-        public static final int piButton=0x7f08001b;
-        public static final int plusButton=0x7f080008;
-        public static final int pointDigitButton=0x7f080017;
-        public static final int resultEditText=0x7f080003;
-        public static final int roundBracketsButton=0x7f080009;
-        public static final int sevenDigitButton=0x7f080010;
-        public static final int simplifyButton=0x7f080019;
-        public static final int sixDigitButton=0x7f08000c;
-        public static final int sqrtButton=0x7f080014;
-        public static final int squareBracketsButton=0x7f08000f;
-        public static final int subtractionButton=0x7f08000d;
-        public static final int threeDigitButton=0x7f080006;
-        public static final int twoDigitButton=0x7f080005;
-        public static final int zeroDigitButton=0x7f080016;
+        public static final int calibrationArrow=0x7f080000;
+        public static final int calibrationButton=0x7f080001;
+        public static final int calibrationStart=0x7f080002;
+        public static final int curlyBracketsButton=0x7f080016;
+        public static final int editText=0x7f080003;
+        public static final int eigthDigitButton=0x7f080012;
+        public static final int equalsButton=0x7f080014;
+        public static final int fiveDigitButton=0x7f08000c;
+        public static final int fourDigitButton=0x7f08000b;
+        public static final int historyButton=0x7f08001b;
+        public static final int menu_item_help=0x7f08001e;
+        public static final int menu_item_settings=0x7f08001d;
+        public static final int minusButton=0x7f08000f;
+        public static final int muliplicationButton=0x7f080008;
+        public static final int nineDigitButton=0x7f080013;
+        public static final int numericButton=0x7f080019;
+        public static final int oneDigitButton=0x7f080005;
+        public static final int piButton=0x7f08001c;
+        public static final int plusButton=0x7f080009;
+        public static final int pointDigitButton=0x7f080018;
+        public static final int resultEditText=0x7f080004;
+        public static final int roundBracketsButton=0x7f08000a;
+        public static final int sevenDigitButton=0x7f080011;
+        public static final int simplifyButton=0x7f08001a;
+        public static final int sixDigitButton=0x7f08000d;
+        public static final int sqrtButton=0x7f080015;
+        public static final int squareBracketsButton=0x7f080010;
+        public static final int subtractionButton=0x7f08000e;
+        public static final int threeDigitButton=0x7f080007;
+        public static final int twoDigitButton=0x7f080006;
+        public static final int zeroDigitButton=0x7f080017;
     }
     public static final class layout {
         public static final int drag_button_calibration=0x7f030000;
diff --git a/res/drawable/down.png b/res/drawable/down.png
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literal 0
HcmV?d00001

diff --git a/res/drawable/up.png b/res/drawable/up.png
new file mode 100644
index 0000000000000000000000000000000000000000..9d65c20932c6553ed24ff902af798eba9b7e6ab7
GIT binary patch
literal 2792
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literal 0
HcmV?d00001

diff --git a/res/layout/drag_button_calibration.xml b/res/layout/drag_button_calibration.xml
index c77f4f2e..93fbaef5 100644
--- a/res/layout/drag_button_calibration.xml
+++ b/res/layout/drag_button_calibration.xml
@@ -8,20 +8,29 @@
 			  a:layout_width="fill_parent"
 			  a:layout_height="fill_parent">
 
+	<LinearLayout 	a:orientation="horizontal"
+					a:layout_width="fill_parent"
+					a:layout_height="wrap_content">
 
-	<org.solovyev.android.view.DragButton a:id="@+id/calibrationButton"
-										  a:text=""
-										  calc:textUp="@string/c_up"
-										  calc:textDown="@string/c_down"
-										  style="@style/digitButtonStyle"
-										  a:layout_width="50dp"
-										  a:layout_height="50dp"
-										  a:gravity="center_vertical"			/>
+		<ImageView a:id="@+id/calibrationArrow"
+				   a:layout_gravity="left"
+				   a:layout_width="80dp"
+				   a:layout_height="80dp"/>
+
+		<org.solovyev.android.view.DirectionDragButton a:id="@+id/calibrationButton"
+											  a:text=""
+											  calc:textUp="@string/c_up"
+											  calc:textDown="@string/c_down"
+											  style="@style/digitButtonStyle"
+											  a:layout_width="80dp"
+											  a:layout_height="80dp"
+											  a:layout_gravity="center_horizontal"/>
+	</LinearLayout>
 
 	<Button a:id="@+id/calibrationStart"
 			a:text="@string/c_restart"
 			a:layout_width="wrap_content"
 			a:layout_height="wrap_content"
 			a:onClick="restartClickHandler"
-			a:gravity="bottom"/>
+			a:layout_gravity="bottom"/>
 </LinearLayout>
diff --git a/res/layout/main.xml b/res/layout/main.xml
index 03b8493a..5047a00c 100644
--- a/res/layout/main.xml
+++ b/res/layout/main.xml
@@ -30,36 +30,36 @@
     	a:layout_width="fill_parent"
     	a:layout_height="fill_parent">
     	<TableRow>
-    		<org.solovyev.android.view.DragButton a:id="@+id/oneDigitButton" a:text="1" calc:textUp="sin" calc:textDown="asin" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    		<org.solovyev.android.view.DragButton a:id="@+id/twoDigitButton" a:text="2" calc:textUp="cos" calc:textDown="acos"  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    		<org.solovyev.android.view.DragButton a:id="@+id/threeDigitButton" a:text="3" calc:textUp="tg" calc:textDown="atg"  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-			<org.solovyev.android.view.DragButton a:id="@+id/muliplicationButton" a:text="*" calc:textUp="^" calc:textDown="^2" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-   			<org.solovyev.android.view.DragButton a:id="@+id/plusButton" a:text="+" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-   			<org.solovyev.android.view.DragButton a:id="@+id/roundBracketsButton" a:text="()" calc:textUp="(" calc:textDown=")" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/oneDigitButton" a:text="1" calc:textUp="sin" calc:textDown="asin" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/twoDigitButton" a:text="2" calc:textUp="cos" calc:textDown="acos"  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/threeDigitButton" a:text="3" calc:textUp="tg" calc:textDown="atg"  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+			<org.solovyev.android.view.DirectionDragButton a:id="@+id/muliplicationButton" a:text="*" calc:textUp="^" calc:textDown="^2" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+   			<org.solovyev.android.view.DirectionDragButton a:id="@+id/plusButton" a:text="+" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+   			<org.solovyev.android.view.DirectionDragButton a:id="@+id/roundBracketsButton" a:text="()" calc:textUp="(" calc:textDown=")" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
     	</TableRow>
     	<TableRow>
-    		<org.solovyev.android.view.DragButton a:id="@+id/fourDigitButton" a:text="4" calc:textUp="exp" calc:textDown="mod"  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    		<org.solovyev.android.view.DragButton a:id="@+id/fiveDigitButton" a:text="5" calc:textUp="log" calc:textDown="ln"  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    		<org.solovyev.android.view.DragButton a:id="@+id/sixDigitButton" a:text="6" calc:textUp="!" calc:textDown=""  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    		<org.solovyev.android.view.DragButton a:id="@+id/subtractionButton" a:text="/" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-   			<org.solovyev.android.view.DragButton a:id="@+id/minusButton" a:text="-" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    	    <org.solovyev.android.view.DragButton a:id="@+id/squareBracketsButton" a:text="[]" calc:textUp="[" calc:textDown="]" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/fourDigitButton" a:text="4" calc:textUp="exp" calc:textDown="mod"  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/fiveDigitButton" a:text="5" calc:textUp="log" calc:textDown="ln"  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/sixDigitButton" a:text="6" calc:textUp="!" calc:textDown=""  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/subtractionButton" a:text="/" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+   			<org.solovyev.android.view.DirectionDragButton a:id="@+id/minusButton" a:text="-" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    	    <org.solovyev.android.view.DirectionDragButton a:id="@+id/squareBracketsButton" a:text="[]" calc:textUp="[" calc:textDown="]" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
     	</TableRow>
     	<TableRow>
-    		<org.solovyev.android.view.DragButton a:id="@+id/sevenDigitButton" a:text="7" calc:textUp="" calc:textDown=""  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    		<org.solovyev.android.view.DragButton a:id="@+id/eigthDigitButton" a:text="8" calc:textUp="" calc:textDown=""  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    		<org.solovyev.android.view.DragButton a:id="@+id/nineDigitButton" a:text="9" calc:textUp="" calc:textDown=""  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    		<org.solovyev.android.view.DragButton a:id="@+id/equalsButton" a:text="=" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    	    <org.solovyev.android.view.DragButton a:id="@+id/sqrtButton" a:text="sqrt" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    	    <org.solovyev.android.view.DragButton a:id="@+id/curlyBracketsButton" a:text="{}" calc:textUp="{" calc:textDown="}" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/sevenDigitButton" a:text="7" calc:textUp="" calc:textDown=""  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/eigthDigitButton" a:text="8" calc:textUp="" calc:textDown=""  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/nineDigitButton" a:text="9" calc:textUp="" calc:textDown=""  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/equalsButton" a:text="=" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    	    <org.solovyev.android.view.DirectionDragButton a:id="@+id/sqrtButton" a:text="sqrt" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    	    <org.solovyev.android.view.DirectionDragButton a:id="@+id/curlyBracketsButton" a:text="{}" calc:textUp="{" calc:textDown="}" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
     	</TableRow>
     	<TableRow>
-    		<org.solovyev.android.view.DragButton a:id="@+id/zeroDigitButton" a:text="0" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    	    <org.solovyev.android.view.DragButton a:id="@+id/pointDigitButton" a:text="." calc:textDown=","  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
-    	    <org.solovyev.android.view.DragButton a:id="@+id/numericButton" a:text="numeric" style="@style/digitButtonStyle" a:onClick="numericButtonClickHandler"/>
-    	    <org.solovyev.android.view.DragButton a:id="@+id/simplifyButton" a:text="simplify" style="@style/digitButtonStyle" a:onClick="simplifyButtonClickHandler"/>
-       	    <org.solovyev.android.view.DragButton a:id="@+id/historyButton" calc:textUp="undo" calc:textDown="redo" style="@style/digitButtonStyle"/>
-       	    <org.solovyev.android.view.DragButton a:id="@+id/piButton" a:text="pi" calc:textUp="e" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    		<org.solovyev.android.view.DirectionDragButton a:id="@+id/zeroDigitButton" a:text="0" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    	    <org.solovyev.android.view.DirectionDragButton a:id="@+id/pointDigitButton" a:text="." calc:textDown=","  style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
+    	    <org.solovyev.android.view.DirectionDragButton a:id="@+id/numericButton" a:text="numeric" style="@style/digitButtonStyle" a:onClick="numericButtonClickHandler"/>
+    	    <org.solovyev.android.view.DirectionDragButton a:id="@+id/simplifyButton" a:text="simplify" style="@style/digitButtonStyle" a:onClick="simplifyButtonClickHandler"/>
+       	    <org.solovyev.android.view.DirectionDragButton a:id="@+id/historyButton" calc:textUp="undo" calc:textDown="redo" style="@style/digitButtonStyle"/>
+       	    <org.solovyev.android.view.DirectionDragButton a:id="@+id/piButton" a:text="pi" calc:textUp="e" style="@style/digitButtonStyle" a:onClick="digitButtonClickHandler"/>
     	</TableRow>
     </TableLayout>
 </LinearLayout>
diff --git a/src/org/solovyev/android/calculator/CalculatorActivity.java b/src/org/solovyev/android/calculator/CalculatorActivity.java
index 9f2e16f6..0d1263d0 100644
--- a/src/org/solovyev/android/calculator/CalculatorActivity.java
+++ b/src/org/solovyev/android/calculator/CalculatorActivity.java
@@ -2,8 +2,14 @@ package org.solovyev.android.calculator;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.List;
 
+import android.content.BroadcastReceiver;
+import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.Handler;
 import android.view.*;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -34,6 +40,12 @@ public class CalculatorActivity extends Activity {
 	@NotNull
 	private HistoryHelper<EditorHistoryState> historyHelper;
 
+	@NotNull
+	private BroadcastReceiver preferencesChangesReceiver;
+
+	@NotNull
+	private List<SimpleOnDragListener> onDragListeners = new ArrayList<SimpleOnDragListener>();
+
 	/**
 	 * Called when the activity is first created.
 	 */
@@ -46,23 +58,19 @@ public class CalculatorActivity extends Activity {
 
 		this.resultEditText = (EditText) findViewById(R.id.resultEditText);
 
+		final DragButtonCalibrationActivity.Preferences dragPreferences = DragButtonCalibrationActivity.getPreferences(this);
+
 		final SimpleOnDragListener onDragListener = new SimpleOnDragListener(new SimpleOnDragListener.DragProcessor() {
 			@Override
 			public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
-				boolean result = isDirectionSupported(dragButton, dragDirection);
-
-				if (result) {
-					processButtonAction(dragButton, getActionText(dragButton, dragDirection));
-				}
-
-				return result;
+				assert dragButton instanceof DirectionDragButton;
+				processButtonAction(dragButton, getActionText((DirectionDragButton) dragButton, dragDirection));
+				return true;
 			}
 
-			public boolean isDirectionSupported(@NotNull DragButton dragButton, @NotNull DragDirection direction) {
-				return !StringUtils.isEmpty(getActionText(dragButton, direction));
-			}
+		}, dragPreferences);
 
-		});
+		onDragListeners.add(onDragListener);
 
 		// todo serso: check if there is more convenient method for doing this
 		final R.id ids = new R.id();
@@ -82,7 +90,9 @@ public class CalculatorActivity extends Activity {
 			}
 		}
 
-		((DragButton) findViewById(R.id.historyButton)).setOnDragListener(new SimpleOnDragListener(new HistoryDragProcessor()));
+		final SimpleOnDragListener historyOnDragListener = new SimpleOnDragListener(new HistoryDragProcessor(), dragPreferences);
+		((DragButton) findViewById(R.id.historyButton)).setOnDragListener(historyOnDragListener);
+		onDragListeners.add(historyOnDragListener);
 
 		this.interpreter = new Interpreter();
 
@@ -94,6 +104,19 @@ public class CalculatorActivity extends Activity {
 
 		this.historyHelper = new SimpleHistoryHelper<EditorHistoryState>();
 		this.historyHelper.addState(getCurrentHistoryState());
+
+		this.preferencesChangesReceiver = new BroadcastReceiver() {
+			@Override
+			public void onReceive(Context context, Intent intent) {
+
+				if (DragButtonCalibrationActivity.INTENT_ACTION.equals(intent.getAction())) {
+					final DragButtonCalibrationActivity.Preferences preferences = DragButtonCalibrationActivity.getPreferences(CalculatorActivity.this);
+					for (SimpleOnDragListener dragListener : onDragListeners) {
+						dragListener.setPreferences(preferences);
+					}
+				}
+			}
+		};
 	}
 
 	public void elementaryButtonClickHandler(@NotNull View v) {
@@ -119,7 +142,7 @@ public class CalculatorActivity extends Activity {
 	}
 
 	public void digitButtonClickHandler(@NotNull View v) {
-		processButtonAction(v, ((DragButton) v).getTextMiddle());
+		processButtonAction(v, ((DirectionDragButton) v).getTextMiddle());
 	}
 
 	private final class HistoryDragProcessor implements SimpleOnDragListener.DragProcessor {
@@ -130,7 +153,8 @@ public class CalculatorActivity extends Activity {
 
 			Log.d(String.valueOf(dragButton.getId()), "History on drag event start: " + dragDirection);
 
-			String actionText = getActionText(dragButton, dragDirection);
+			assert dragButton instanceof DirectionDragButton;
+			String actionText = getActionText((DirectionDragButton) dragButton, dragDirection);
 			if (!StringUtils.isEmpty(actionText)) {
 				try {
 					result = true;
@@ -152,7 +176,7 @@ public class CalculatorActivity extends Activity {
 	}
 
 	@Nullable
-	private static String getActionText(@NotNull DragButton dragButton, @NotNull DragDirection direction) {
+	private static String getActionText(@NotNull DirectionDragButton dragButton, @NotNull DragDirection direction) {
 		final String result;
 
 		switch (direction) {
diff --git a/src/org/solovyev/android/calculator/DragButtonCalibrationActivity.java b/src/org/solovyev/android/calculator/DragButtonCalibrationActivity.java
index 35cd2972..cd934173 100644
--- a/src/org/solovyev/android/calculator/DragButtonCalibrationActivity.java
+++ b/src/org/solovyev/android/calculator/DragButtonCalibrationActivity.java
@@ -1,19 +1,30 @@
 package org.solovyev.android.calculator;
 
 import android.app.Activity;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
 import android.os.Bundle;
-import android.preference.PreferenceActivity;
+import android.os.Handler;
+import android.util.Log;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
-import android.widget.Toast;
+import android.widget.ImageView;
 import org.jetbrains.annotations.NotNull;
 import org.solovyev.android.view.*;
+import org.solovyev.common.collections.ManyValuedHashMap;
+import org.solovyev.common.collections.ManyValuedMap;
+import org.solovyev.common.utils.Interval;
 import org.solovyev.util.math.MathUtils;
 import org.solovyev.util.math.Point2d;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.prefs.Preferences;
 
 /**
  * User: serso
@@ -22,12 +33,34 @@ import java.util.List;
  */
 public class DragButtonCalibrationActivity extends Activity {
 
-
 	@NotNull
 	private DragDirection dragDirection = DragDirection.up;
 
+	@NotNull
 	private final List<DragData> dragHistory = new ArrayList<DragData>();
 
+	@NotNull
+	private ImageView calibrationArrow;
+
+	public static final String PREFERENCES = "dragButtonPreferences";
+
+	public static final String PREFERENCES_FIRST_RUN = "firstRun";
+
+	public static final String PREFERENCES_MIN = "min";
+	public static final String PREFERENCES_MAX = "max";
+
+	private static final float DEFAULT_VALUE = -999;
+	private static final int MIN_HISTORY_FOR_CALIBRATION = 10;
+	public static final String INTENT_ACTION = "org.solovyev.android.calculator.DragButtonPreferencesChanged";
+	;
+
+	public static enum PreferenceType {
+		angle,
+		distance,
+		duration
+	}
+
+
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
@@ -37,17 +70,23 @@ public class DragButtonCalibrationActivity extends Activity {
 		final DragButton calibrationButton = (DragButton) findViewById(R.id.calibrationButton);
 		calibrationButton.setOnDragListener(new CalibrationOnDragListener());
 
-		createDragDirection();
+		calibrationArrow = (ImageView) findViewById(R.id.calibrationArrow);
+
+		createDragDirection(0);
 	}
 
-	private void createDragDirection() {
-		dragDirection = Math.random() > 0.5 ? DragDirection.up : DragDirection.down;
+	private void createDragDirection(long timeout) {
+		new Handler().postDelayed(new Runnable() {
+			public void run() {
+				dragDirection = Math.random() > 0.5 ? DragDirection.up : DragDirection.down;
 
-		Toast.makeText(this, dragDirection.name(), Toast.LENGTH_SHORT).show();
+				calibrationArrow.setImageResource(dragDirection == DragDirection.down ? R.drawable.down : R.drawable.up);
+			}
+		}, timeout);
 	}
 
 	public void restartClickHandler(View v) {
-		createDragDirection();
+		createDragDirection(0);
 	}
 
 
@@ -71,13 +110,20 @@ public class DragButtonCalibrationActivity extends Activity {
 			double angle = Math.toDegrees(MathUtils.getAngle(startPoint, MathUtils.sum(startPoint, SimpleOnDragListener.axis), endPoint));
 
 			assert dragDirection == DragDirection.up || dragDirection == DragDirection.down;
+
+			double deviationAngle = angle;
 			if (dragDirection == DragDirection.up) {
-				angle = 180 - angle;
+				deviationAngle = 180 - deviationAngle;
 			}
 
-			dragHistory.add(new DragData(distance, angle, dragDirection));
+			if (deviationAngle > 45) {
+				calibrationArrow.setImageResource(R.drawable.not_ok);
+			} else {
+				calibrationArrow.setImageResource(R.drawable.ok);
+				dragHistory.add(new DragData(dragDirection, distance, angle, (motionEvent.getEventTime() - motionEvent.getDownTime())));
+			}
 
-			createDragDirection();
+			createDragDirection(500);
 
 			return true;
 		}
@@ -86,28 +132,210 @@ public class DragButtonCalibrationActivity extends Activity {
 	@Override
 	public boolean onKeyDown(int keyCode, KeyEvent event) {
 		if (keyCode == KeyEvent.KEYCODE_BACK) {
-			final List<Double> angleValues = new ArrayList<Double>();
-			final List<Double> distanceValues = new ArrayList<Double>();
-			for (DragData dragData : dragHistory) {
-				angleValues.add(dragData.getAngle());
-				distanceValues.add((double) dragData.getDistance());
+
+			if (dragHistory.size() > MIN_HISTORY_FOR_CALIBRATION) {
+				final ManyValuedMap<DragDirection, Double> anglesByDirection = new ManyValuedHashMap<DragDirection, Double>();
+				final ManyValuedMap<DragDirection, Double> distancesByDirection = new ManyValuedHashMap<DragDirection, Double>();
+				final ManyValuedMap<DragDirection, Double> timesByDirection = new ManyValuedHashMap<DragDirection, Double>();
+				for (DragData dragData : dragHistory) {
+					anglesByDirection.put(dragData.getDirection(), dragData.getAngle());
+					distancesByDirection.put(dragData.getDirection(), (double) dragData.getDistance());
+					timesByDirection.put(dragData.getDirection(), dragData.getTime());
+				}
+
+				final Map<DragDirection, MathUtils.StatData> angleStatData = getStatDataByDirection(anglesByDirection);
+				final Map<DragDirection, MathUtils.StatData> distanceStatData = getStatDataByDirection(distancesByDirection);
+				final Map<DragDirection, MathUtils.StatData> timeStatData = getStatDataByDirection(timesByDirection);
+
+				Log.d(this.getClass().getName(), "Angle statistics: ");
+				logStatData(angleStatData);
+
+				Log.d(this.getClass().getName(), "Distance statistics: ");
+				logStatData(distanceStatData);
+
+				Log.d(this.getClass().getName(), "Time statistics: ");
+				logStatData(timeStatData);
+
+				final SharedPreferences settings = getSharedPreferences(PREFERENCES, 0);
+				final SharedPreferences.Editor editor = settings.edit();
+
+				setPreferences(angleStatData, editor, PreferenceType.angle);
+				setPreferences(distanceStatData, editor, PreferenceType.distance);
+				setPreferences(timeStatData, editor, PreferenceType.duration);
+
+				editor.commit();
+
+				sendOrderedBroadcast(new Intent(INTENT_ACTION), null);
 			}
-
-			double angleMean = MathUtils.countMean(angleValues);
-			double angleDeviation = MathUtils.countStandardDeviation(angleMean, angleValues);
-
-			double distanceMean = MathUtils.countMean(distanceValues);
-			double distanceDeviation = MathUtils.countStandardDeviation(distanceMean, distanceValues);
-
-			Toast.makeText(this, "Angle: m=" + angleMean + ", d=" + angleDeviation, Toast.LENGTH_SHORT).show();
-			Toast.makeText(this, "Distance: m=" + distanceMean + ", d=" + distanceDeviation, Toast.LENGTH_SHORT).show();
-
 		}
 
 
 		return super.onKeyDown(keyCode, event);
 	}
 
+	private void setPreferences(@NotNull Map<DragDirection, MathUtils.StatData> statData, @NotNull SharedPreferences.Editor editor, @NotNull PreferenceType preferenceType) {
+		for (Map.Entry<DragDirection, MathUtils.StatData> entry : statData.entrySet()) {
+			final float min = (float) entry.getValue().getMean() - 2 * (float) entry.getValue().getStandardDeviation();
+			final float max = (float) entry.getValue().getMean() + 2 * (float) entry.getValue().getStandardDeviation();
+			editor.putFloat(preferenceType.name() + "_" + entry.getKey().name() + "_" + PREFERENCES_MIN, Math.max(0, min));
+			editor.putFloat(preferenceType.name() + "_" + entry.getKey().name() + "_" + PREFERENCES_MAX, max);
+		}
+	}
+
+	@NotNull
+	public static Preferences getPreferences(@NotNull Context context) {
+		SharedPreferences preferences = context.getSharedPreferences(PREFERENCES, MODE_PRIVATE);
+
+		final Preferences result = new Preferences();
+
+		for (PreferenceType preferenceType : PreferenceType.values()) {
+			for (DragDirection dragDirection : DragDirection.values()) {
+
+				final float defaultMin;
+				final float defaultMax;
+				switch (preferenceType) {
+					case angle:
+						switch (dragDirection) {
+							case up:
+								defaultMin = 150f;
+								defaultMax = 180f;
+								break;
+							case down:
+								defaultMin = 0f;
+								defaultMax = 30f;
+								break;
+							default:
+								defaultMin = DEFAULT_VALUE;
+								defaultMax = DEFAULT_VALUE;
+						}
+						break;
+					case distance:
+						defaultMin = 60f;
+						defaultMax = 140f;
+						break;
+					case duration:
+						defaultMin = 100f;
+						defaultMax = 300f;
+						break;
+					default:
+						defaultMin = DEFAULT_VALUE;
+						defaultMax = DEFAULT_VALUE;
+				}
+
+				final float min = preferences.getFloat(preferenceType.name() + "_" + dragDirection.name() + "_" + PREFERENCES_MIN, defaultMin);
+				final float max = preferences.getFloat(preferenceType.name() + "_" + dragDirection.name() + "_" + PREFERENCES_MAX, defaultMax);
+
+				if (min != DEFAULT_VALUE && max != DEFAULT_VALUE) {
+					final DragPreference directionPreference = new DragPreference(dragDirection, new Interval(min, max));
+
+					Preference preference = result.getPreferencesMap().get(preferenceType);
+					if (preference == null) {
+						preference = new Preference(preferenceType);
+						result.getPreferencesMap().put(preferenceType, preference);
+					}
+
+					preference.getDirectionPreferences().put(dragDirection, directionPreference);
+
+				} else {
+					Log.e(DragButtonCalibrationActivity.class.getName(), "New preference type added: default preferences should be defined!");
+				}
+			}
+		}
+
+		return result;
+	}
+
+	public static class DragPreference {
+
+		@NotNull
+		private DragDirection direction;
+
+		@NotNull
+		private Interval interval;
+
+
+		public DragPreference(@NotNull DragDirection direction, @NotNull Interval interval) {
+			this.direction = direction;
+			this.interval = interval;
+		}
+
+		@NotNull
+		public DragDirection getDirection() {
+			return direction;
+		}
+
+		public void setDirection(@NotNull DragDirection direction) {
+			this.direction = direction;
+		}
+
+		@NotNull
+		public Interval getInterval() {
+			return interval;
+		}
+
+		public void setInterval(@NotNull Interval interval) {
+			this.interval = interval;
+		}
+	}
+
+	public static class Preference {
+
+		@NotNull
+		private PreferenceType preferenceType;
+
+		@NotNull
+		private Map<DragDirection, DragPreference> directionPreferences = new HashMap<DragDirection, DragPreference>();
+
+
+		public Preference(@NotNull PreferenceType preferenceType) {
+			this.preferenceType = preferenceType;
+		}
+
+		@NotNull
+		public PreferenceType getPreferenceType() {
+			return preferenceType;
+		}
+
+		public void setPreferenceType(@NotNull PreferenceType preferenceType) {
+			this.preferenceType = preferenceType;
+		}
+
+		@NotNull
+		public Map<DragDirection, DragPreference> getDirectionPreferences() {
+			return directionPreferences;
+		}
+
+		public void setDirectionPreferences(@NotNull Map<DragDirection, DragPreference> directionPreferences) {
+			this.directionPreferences = directionPreferences;
+		}
+	}
+
+
+	public static class Preferences {
+
+		private final Map<PreferenceType, Preference> preferencesMap = new HashMap<PreferenceType, Preference>();
+
+		public Map<PreferenceType, Preference> getPreferencesMap() {
+			return preferencesMap;
+		}
+	}
+
+	private void logStatData(@NotNull Map<DragDirection, MathUtils.StatData> statData) {
+		for (Map.Entry<DragDirection, MathUtils.StatData> entry : statData.entrySet()) {
+			Log.d(this.getClass().getName(), entry.getKey() + "-> m: " + entry.getValue().getMean() + ", d: " + entry.getValue().getStandardDeviation());
+		}
+	}
+
+	private Map<DragDirection, MathUtils.StatData> getStatDataByDirection(@NotNull ManyValuedMap<DragDirection, Double> valuesByDirection) {
+		final Map<DragDirection, MathUtils.StatData> result = new HashMap<DragDirection, MathUtils.StatData>();
+
+		for (Map.Entry<DragDirection, List<Double>> entry : valuesByDirection.entrySet()) {
+			result.put(entry.getKey(), MathUtils.getStatData(entry.getValue()));
+		}
+
+		return result;
+	}
+
 
 	private class DragData {
 
@@ -115,13 +343,16 @@ public class DragButtonCalibrationActivity extends Activity {
 
 		private double angle;
 
+		private double time;
+
 		@NotNull
 		private DragDirection direction;
 
-		private DragData(float distance, double angle, @NotNull DragDirection direction) {
+		private DragData(@NotNull DragDirection direction, float distance, double angle, double time) {
 			this.distance = distance;
 			this.angle = angle;
 			this.direction = direction;
+			this.time = time;
 		}
 
 		public float getDistance() {
@@ -136,5 +367,9 @@ public class DragButtonCalibrationActivity extends Activity {
 		public DragDirection getDirection() {
 			return direction;
 		}
+
+		public double getTime() {
+			return time;
+		}
 	}
 }
diff --git a/src/org/solovyev/android/view/DirectionDragButton.java b/src/org/solovyev/android/view/DirectionDragButton.java
new file mode 100644
index 00000000..761e212a
--- /dev/null
+++ b/src/org/solovyev/android/view/DirectionDragButton.java
@@ -0,0 +1,99 @@
+package org.solovyev.android.view;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.text.Html;
+import android.util.AttributeSet;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.calculator.R;
+import org.solovyev.util.StringUtils;
+
+/**
+ * User: serso
+ * Date: 7/17/11
+ * Time: 10:25 PM
+ */
+public class DirectionDragButton extends DragButton {
+
+	@Nullable
+	private String textUp;
+
+	@Nullable
+	private String textDown;
+
+	@Nullable
+	private String textMiddle;
+
+	public DirectionDragButton(Context context, @NotNull AttributeSet attrs) {
+		super(context, attrs);
+		init(context, attrs);
+	}
+
+	public DirectionDragButton(Context context, AttributeSet attrs, int defStyle) {
+		super(context, attrs, defStyle);
+		init(context, attrs);
+	}
+
+	private void init(@NotNull Context context, @NotNull AttributeSet attrs) {
+
+		TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DragButton);
+
+		final int N = a.getIndexCount();
+		for (int i = 0; i < N; i++) {
+			int attr = a.getIndex(i);
+			switch (attr) {
+				case R.styleable.DragButton_textUp:
+					this.textUp = a.getString(attr);
+					break;
+				case R.styleable.DragButton_textDown:
+					this.textDown = a.getString(attr);
+					break;
+			}
+		}
+
+		// backup text
+		this.textMiddle = String.valueOf(getText());
+
+		setText(Html.fromHtml(getStyledUpDownText(this.textUp) + "<br><b>" + StringUtils.getNotEmpty(this.textMiddle, "&nbsp;") + "</b><br>" + getStyledUpDownText(this.textDown)));
+
+		// change top padding in order to show all text
+		setPadding(getPaddingLeft(), -7, getPaddingRight(), getPaddingBottom());
+	}
+
+	private String getStyledUpDownText(@Nullable String text) {
+		final StringBuilder sb = new StringBuilder();
+
+		sb.append("<font color='#585858'><small><small>");
+		sb.append(StringUtils.getNotEmpty(text, "&nbsp;"));
+		sb.append("</small></small></font>");
+		return sb.toString();
+	}
+
+	public void setTextUp(@Nullable String textUp) {
+		this.textUp = textUp;
+	}
+
+	@Nullable
+	public String getTextUp() {
+		return textUp;
+	}
+
+	public void setTextDown(@Nullable String textDown) {
+		this.textDown = textDown;
+	}
+
+	@Nullable
+	public String getTextDown() {
+		return textDown;
+	}
+
+	public void setTextMiddle(@Nullable String textMiddle) {
+		this.textMiddle = textMiddle;
+	}
+
+	@Nullable
+	public String getTextMiddle() {
+		return textMiddle;
+	}
+}
diff --git a/src/org/solovyev/android/view/DragButton.java b/src/org/solovyev/android/view/DragButton.java
index 991e3849..6c5e99a2 100644
--- a/src/org/solovyev/android/view/DragButton.java
+++ b/src/org/solovyev/android/view/DragButton.java
@@ -19,9 +19,6 @@ import android.widget.Button;
 
 public class DragButton extends Button {
 
-	// max time in ms to register drag event
-	private long maxTime = 700;
-
 	@Nullable
 	private Point2d startPoint = null;
 
@@ -30,61 +27,16 @@ public class DragButton extends Button {
 
 	private final OnTouchListener onTouchListener = new OnTouchListenerImpl();
 
-	@Nullable
-	private String textUp;
-
-	@Nullable
-	private String textDown;
-
-	@Nullable
-	private String textMiddle;
-
 	public DragButton(Context context, @NotNull AttributeSet attrs) {
 		super(context, attrs);
-		init(context, attrs);
+		setOnTouchListener(this.onTouchListener);
 	}
 
 	public DragButton(Context context, AttributeSet attrs, int defStyle) {
 		super(context, attrs, defStyle);
-		init(context, attrs);
-	}
-
-	private void init(@NotNull Context context, @NotNull AttributeSet attrs) {
-		TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DragButton);
-
-		final int N = a.getIndexCount();
-		for (int i = 0; i < N; i++) {
-			int attr = a.getIndex(i);
-			switch (attr) {
-				case R.styleable.DragButton_textUp:
-					this.textUp = a.getString(attr);
-					break;
-				case R.styleable.DragButton_textDown:
-					this.textDown = a.getString(attr);
-					break;
-			}
-		}
-
-		// backup text
-		this.textMiddle = String.valueOf(getText());
-
-		setText(Html.fromHtml(getStyledUpDownText(this.textUp) + "<br><b>" + StringUtils.getNotEmpty(this.textMiddle, "&nbsp;") + "</b><br>" + getStyledUpDownText(this.textDown)));
-
-		// change top padding in order to show all text
-		setPadding(getPaddingLeft(), -7, getPaddingRight(), getPaddingBottom());
-
 		setOnTouchListener(this.onTouchListener);
 	}
 
-	private String getStyledUpDownText(@Nullable String text) {
-		final StringBuilder sb = new StringBuilder();
-
-		sb.append("<font color='#585858'><small><small>");
-		sb.append(StringUtils.getNotEmpty(text, "&nbsp;"));
-		sb.append("</small></small></font>");
-		return sb.toString();
-	}
-
 	public void setOnDragListener(@Nullable OnDragListener onDragListener) {
 		this.onDragListener = onDragListener;
 	}
@@ -94,33 +46,6 @@ public class DragButton extends Button {
 		return onDragListener;
 	}
 
-	public void setTextUp(@Nullable String textUp) {
-		this.textUp = textUp;
-	}
-
-	@Nullable
-	public String getTextUp() {
-		return textUp;
-	}
-
-	public void setTextDown(@Nullable String textDown) {
-		this.textDown = textDown;
-	}
-
-	@Nullable
-	public String getTextDown() {
-		return textDown;
-	}
-
-	public void setTextMiddle(@Nullable String textMiddle) {
-		this.textMiddle = textMiddle;
-	}
-
-	@Nullable
-	public String getTextMiddle() {
-		return textMiddle;
-	}
-
 	/**
 	 * OnTouchListener implementation that fires onDrag()
 	 * 
@@ -148,13 +73,6 @@ public class DragButton extends Button {
 						startPoint = new Point2d(event.getX(), event.getY());
 						break;
 
-					case MotionEvent.ACTION_MOVE:
-						if (event.getEventTime() - event.getDownTime() > maxTime) {
-							// do not allow very long touch movements
-							startPoint = null;
-						}
-						break;
-
 					case MotionEvent.ACTION_UP:
 						// stop tracking
 							
diff --git a/src/org/solovyev/android/view/SimpleOnDragListener.java b/src/org/solovyev/android/view/SimpleOnDragListener.java
index 4cf0264e..bf186d1b 100644
--- a/src/org/solovyev/android/view/SimpleOnDragListener.java
+++ b/src/org/solovyev/android/view/SimpleOnDragListener.java
@@ -1,33 +1,38 @@
 package org.solovyev.android.view;
 
 import org.jetbrains.annotations.NotNull;
+import org.solovyev.android.calculator.DragButtonCalibrationActivity;
+import org.solovyev.common.utils.Interval;
 import org.solovyev.util.math.MathUtils;
 import org.solovyev.util.math.Point2d;
 
 import android.util.Log;
 import android.view.MotionEvent;
 
+import java.util.Map;
+
 public class SimpleOnDragListener implements OnDragListener {
 
 	@NotNull
 	public static final Point2d axis = new Point2d(0, 1);
 
-	private float minDragDist = 20f;
-
-	private float maxDragDist = 80f;
-
-	// max angle (in degrees!) between start and end point vector and axis
-	// vector to register drag event
-	private double maxAngle = 30;
-	
 	@NotNull
 	private DragProcessor dragProcessor;
 
-	public SimpleOnDragListener() {
+	@NotNull
+	private DragButtonCalibrationActivity.Preferences preferences;
+
+	public SimpleOnDragListener(@NotNull DragButtonCalibrationActivity.Preferences preferences) {
+		this.preferences = preferences;
 	}
 
-	public SimpleOnDragListener(@NotNull DragProcessor dragProcessor) {
+	public SimpleOnDragListener(@NotNull DragProcessor dragProcessor, @NotNull DragButtonCalibrationActivity.Preferences preferences) {
 		this.dragProcessor = dragProcessor;
+		this.preferences = preferences;
+	}
+
+	public void setPreferences(@NotNull DragButtonCalibrationActivity.Preferences preferences) {
+		this.preferences = preferences;
 	}
 
 	@Override
@@ -42,28 +47,48 @@ public class SimpleOnDragListener implements OnDragListener {
 		// init end point
 		final Point2d endPoint = new Point2d(motionEvent.getX(), motionEvent.getY());
 
-		float distance = MathUtils.getDistance(startPoint, endPoint);
+		final float distance = MathUtils.getDistance(startPoint, endPoint);
+		final double angle = Math.toDegrees(MathUtils.getAngle(startPoint, MathUtils.sum(startPoint, axis), endPoint));
+		final double duration = motionEvent.getEventTime() - motionEvent.getDownTime();
 
-		if (minDragDist < distance && distance < maxDragDist) {
-			double angle = Math.toDegrees(MathUtils.getAngle(startPoint, MathUtils.sum(startPoint, axis), endPoint));
+		final DragButtonCalibrationActivity.Preference distancePreferences = preferences.getPreferencesMap().get(DragButtonCalibrationActivity.PreferenceType.distance);
+		final DragButtonCalibrationActivity.Preference anglePreferences = preferences.getPreferencesMap().get(DragButtonCalibrationActivity.PreferenceType.angle);
 
-			final DragDirection direction;
-			if (angle < maxAngle) {
-				direction = DragDirection.down;
-			} else if (180 - angle < maxAngle) {
-				direction = DragDirection.up;
-			} else {
-				direction = null;
+		DragDirection direction = null;
+		for (Map.Entry<DragDirection, DragButtonCalibrationActivity.DragPreference> directionEntry : distancePreferences.getDirectionPreferences().entrySet()) {
+
+			if (isInInterval(directionEntry.getValue().getInterval(), distance)) {
+				for (Map.Entry<DragDirection, DragButtonCalibrationActivity.DragPreference> angleEntry : anglePreferences.getDirectionPreferences().entrySet()) {
+					if (isInInterval(angleEntry.getValue().getInterval(), (float)angle)) {
+						direction = angleEntry.getKey();
+						break;
+					}
+				}
 			}
 
 			if (direction != null) {
+				break;
+			}
+		}
+
+		if (direction != null) {
+			final DragButtonCalibrationActivity.Preference durationPreferences = preferences.getPreferencesMap().get(DragButtonCalibrationActivity.PreferenceType.duration);
+
+			final DragButtonCalibrationActivity.DragPreference durationDragPreferences = durationPreferences.getDirectionPreferences().get(direction);
+
+			if (isInInterval(durationDragPreferences.getInterval(), (float)duration)) {
 				result = dragProcessor.processDragEvent(direction, dragButton, startPoint, motionEvent);
+
 			}
 		}
 
 		return result;
 	}
 
+	private boolean isInInterval(@NotNull Interval interval, float value) {
+		return interval.getStart() - MathUtils.MIN_AMOUNT <= value && value <= interval.getEnd() + MathUtils.MIN_AMOUNT;
+	}
+
 	@Override
 	public boolean isSuppressOnClickEvent() {
 		return true;
@@ -91,7 +116,7 @@ public class SimpleOnDragListener implements OnDragListener {
 	}
 
 	public interface DragProcessor {
-		
+
 		boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent);
 	}
 }
\ No newline at end of file
diff --git a/src/org/solovyev/util/math/MathUtils.java b/src/org/solovyev/util/math/MathUtils.java
index 6beda9b8..6d649ee2 100644
--- a/src/org/solovyev/util/math/MathUtils.java
+++ b/src/org/solovyev/util/math/MathUtils.java
@@ -6,6 +6,8 @@ import java.util.List;
 
 public class MathUtils {
 
+	public static final float MIN_AMOUNT = 0.05f;
+
 	public static float getDistance(@NotNull Point2d startPoint,
 									@NotNull Point2d endPoint) {
 		return getNorm(subtract(endPoint, startPoint));
@@ -58,4 +60,33 @@ public class MathUtils {
 		return objects.size() == 0 ? 0d : Math.sqrt(sum / objects.size());
 	}
 
+	public static StatData getStatData(@NotNull List<Double> objects) {
+
+		final double mean = countMean(objects);
+		final double standardDeviation = countStandardDeviation(mean, objects);
+
+		return new StatData(mean, standardDeviation);
+	}
+
+	public static class StatData {
+
+		private final double mean;
+
+		private final double standardDeviation;
+
+		public StatData(double mean, double standardDeviation) {
+			this.mean = mean;
+			this.standardDeviation = standardDeviation;
+		}
+
+		public double getMean() {
+			return mean;
+		}
+
+		public double getStandardDeviation() {
+			return standardDeviation;
+		}
+
+	}
+
 }