Sunday, May 12, 2013

Create a Windows Store Analog Clock

This sample uses xaml and c# to create an analog clock in a windows store application.  Xaml allows you to vary the angle of lines when drawn on the screen. I used an ellipse as the background of the clock. We will draw 3 lines for the hour, seconds, and minute hand on an analog clock.  A rotate transform turns a line into the second, minute and hour hand.  The transform will draw the line from the center of a circle at the angle needed to represent the time. For seconds and minutes multiply the value by 6 to get the angle for the clocks hand transform.  For hours multiply the hour by 30 to get the angle needed for the hour hand transform.   I use a dispatch timer to update angle of the hands based on the current time.  The dispatch timer will fire an event every second which we use to update the angle of the clocks hand.   The clock could be improved by using a clock image instead of an ellipse.  
Additional work would need to be done to be able to submit the app to the store.   If ads were added you would need to give the app permission to access the internet.  Any app that has access to the internet would require a privacy policy.
 The Xaml
    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <Grid Width="300" Height="300">
            <Ellipse Width="300" Height="300" Fill="Blue"></Ellipse>
            <!-- Second  -->
            <Rectangle Margin="150,0,149,150" Name="rectangleSecond" 
        Stroke="White" Height="120" VerticalAlignment="Bottom">
                    <RotateTransform x:Name="secondHand" CenterX="0" 
                CenterY="120" Angle="0" />
        <!-- Minute  -->
            <Rectangle Margin="150,49,149,151" Name="rectangleMinute" 
                    <RotateTransform x:Name="minuteHand" CenterX="0" 
                CenterY="100" Angle="0" />
        <!-- Hour  -->
            <Rectangle Margin="150,80,149,150" Name="rectangleHour" 
                    <RotateTransform x:Name="hourHand" CenterX="0" 
                CenterY="70" Angle="0" />
The C# code to update the clock
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
// The Blank Page item template is documented at
namespace WSAnalogClock
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
        DispatcherTimer timer = new DispatcherTimer();
        public MainPage()
            timer.Interval = TimeSpan.FromSeconds(1);
            timer.Tick += timer_Tick;
        void timer_Tick(object sender, object e)
            secondHand.Angle = DateTime.Now.Second * 6;
            minuteHand.Angle = DateTime.Now.Minute * 6;
            hourHand.Angle = (DateTime.Now.Hour * 30) + (DateTime.Now.Minute * 0.5);
        /// <summary>
        /// Invoked when this page is about to be displayed in a Frame.
        /// </summary>
        /// <param name="e">Event data that describes how this page was reached.  The Parameter
        /// property is typically used to configure the page.</param>
        protected override void OnNavigatedTo(NavigationEventArgs e)

Visual Studio 2012 and .NET 4.5 Expert Development Cookbook

Visual Studio 2012 and .NET 4.5 Expert Development Cookbook 
One of the books I was technical reviewer for was recently released. I highly recommend you pick up a copy of Visual Studio 2012 and .NET 4.5 Expert Development Cookbook

 Chapter 1: Introduction to Visual Studio IDE Features
Identifying the various components of Visual Studio IDE
Working with Solution Explorer and Class View
Working with the main workspace area of IDE
Navigating between code inside the IDE
Extending Visual Studio templates
Using Code Snippets in Visual Studio
Using Smart Tags and Refactor in Visual Studio

Chapter 2: Basics of .NET Programs and Memory Management
Inspecting the internal structure of a .NET assembly
Working with different types of assemblies
Inspecting the major components of a .NET program
How to work with custom configurations for an application
How to disassemble an assembly
Securing your code from reverse engineering by using obfuscation
Understanding .NET garbage collection and memory management
How to find memory leaks in a .NET program
Solutions to 10 common mistakes made by developers while writing code
 Chapter 3: Asynchronous Programming in .NET
Introduction to Threading and Asynchronous Threading patterns
Working with Event-based asynchronous pattern and BackgroundWorker
Working with thread locking and synchronization
Lock statement using task-based parallelism in concurrent programming
Working with async and await patterns
Working with Task Parallel Library data flows

Chapter 4: Enhancements to ASP.NET
Understanding major performance boosters in ASP.NET web applications
How to work with statically-typed model binding in ASP.NET applications
Introduction to HTML5 and CSS3 in ASP.NET applications
Working with jQuery in Visual Studio with ASP.NET
Working with task-based asynchronous HttpHandlers and HttpModules
New enhancements to various Visual Studio editors
Chapter 5: Enhancements to WPF
Getting started with WPF and its major enhancements in .NET 4.5
Building applications using MVVM pattern supported by WPF
Using the Ribbon User Interface in WPF
Using WeakEvent pattern in WPF
  Chapter 6: Building Touch-sensitive Device Applications in Windows 8
Building your first Windows 8 style tiles application using JavaScript, HTML5, and CSS
Writing a library for WinJS
Building your first Windows 8 style tiles application using C# and XAML
Working with storage files in Windows 8 style tiles applications
Understanding the application life cycle of WinRT applications

Chapter 7: Communication and Sharing using Windows 8
How to enable app to app sharing inside a Windows 8 environment
Working with notification and services
How to perform background transfers of data in Windows 8 style tiles applications