Windows 10 – Universal Windows Platform – Photo Rotate

Step 1

Download Visual Studio Community 2015 and install it onto your computer, if it’s already downloaded and installed select Launch to start Visual Studio Community 2015 or if it has already been downloaded and installed then start the application you may also need to Enable your device for development.

2015-visual-studio

Step 2

Once Visual Studio Community 2015 has started select File, then New, then Project… from the Menu.

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Step 3

From the New Project window select Visual C# from Installed, Templates then select Blank App (Windows Universal) from the list, then type in a Name and select a Location to save to before selecting Ok to create the Project.

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Step 4

Once done select from the Menu, Project, then Add New Item…

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Step 5

From the Add New Item window select Visual C# from Installed and select Code then select Code File from the list, then type in the Name as Library.cs before selecting Add to add the file to the Project

2015-add-new-item-library

Step 6

Once in the Code View for Library.cs the following should be entered:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading.Tasks;
using Windows.Graphics.Imaging;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.Streams;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media.Imaging;

public class Library
{
    private static int angle;
    private static StorageFile file;
    private static WriteableBitmap bitmap;

    private static async Task<WriteableBitmap> read()
    {
        using (IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.Read))
        {
            BitmapDecoder decoder = await BitmapDecoder.CreateAsync(BitmapDecoder.JpegDecoderId, stream);
            uint width = decoder.PixelWidth;
            uint height = decoder.PixelHeight;
            if (angle % 180 != 0)
            {
                width = decoder.PixelHeight;
                height = decoder.PixelWidth;
            }
            Dictionary<int, BitmapRotation> angles = new Dictionary<int, BitmapRotation>()
            {
                { 0, BitmapRotation.None },
                { 90,  BitmapRotation.Clockwise90Degrees },
                { 180,  BitmapRotation.Clockwise180Degrees },
                { 270, BitmapRotation.Clockwise270Degrees },
                { 360, BitmapRotation.None }
            };
            BitmapTransform transform = new BitmapTransform();
            transform.Rotation = angles[angle];
            PixelDataProvider data = await decoder.GetPixelDataAsync(
            BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, transform,
            ExifOrientationMode.IgnoreExifOrientation, ColorManagementMode.DoNotColorManage);
            bitmap = new WriteableBitmap((int)width, (int)height);
            byte[] buffer = data.DetachPixelData();
            using (Stream pixels = bitmap.PixelBuffer.AsStream())
            {
                pixels.Write(buffer, 0, (int)pixels.Length);
            }
        }
        return bitmap;
    }

    private static async void write()
    {
        using (IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.ReadWrite))
        {
            BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, stream);
            encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore,
            (uint)bitmap.PixelWidth, (uint)bitmap.PixelHeight, 96.0, 96.0, bitmap.PixelBuffer.ToArray());
            await encoder.FlushAsync();
        }
    }

    public async void Open(Image display)
    {
        try
        {
            angle = 0;
            FileOpenPicker picker = new FileOpenPicker();
            picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            picker.FileTypeFilter.Add(".jpg");
            StorageFile open = await picker.PickSingleFileAsync();
            if (open != null)
            {
                file = open;
                display.Source = await read();
            }
        }
        catch
        {
        }
    }

    public async void Save()
    {
        try
        {
            FileSavePicker picker = new FileSavePicker();
            picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            picker.FileTypeChoices.Add("Photo", new List<string>() { ".jpg" });
            picker.DefaultFileExtension = ".jpg";
            picker.SuggestedFileName = "Picture";
            StorageFile save = await picker.PickSaveFileAsync();
            if (save != null)
            {
                file = save;
                write();
            }
        }
        catch
        {
        }
    }

    public async void Rotate(Image display)
    {
        if (angle == 360) angle = 0;
        angle += 90;
        display.Source = await read();
    }
}

It should then appear as such:

2015-photo-rotate-library

Step 7

From the Solution Explorer select MainPage.xaml

2015-mainpage-library

Step 8

Select from the Menu, View then Designer

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Step 9

The Design View will be displayed along with the XAML View and in this above <Grid Background=”{ThemeResource ApplicationPageBackgroundThemeBrush}”> enter the following XAML:

<Page.BottomAppBar>
	<AppBar IsOpen="True" IsSticky="True">
		<StackPanel Orientation="Horizontal">
			<AppBarButton Name="Open" Icon="Folder" Label="Open" Click="Open_Click"/>
			<AppBarButton Name="Save" Icon="Save" Label="Save" Click="Save_Click"/>
			<AppBarButton Name="Rotate" Icon="Rotate" Label="Rotate" Click="Rotate_Click"/>
		</StackPanel>
	</AppBar>
</Page.BottomAppBar>

While still in the XAML View below <Grid Background=”{ThemeResource ApplicationPageBackgroundThemeBrush}”> enter the following XAML:

<ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" ZoomMode="Enabled">
	<Image Name="Display"/>
</ScrollViewer>

It should appear as such:

2015-drag-and-drop-mainpage-xaml

Step 10

Select from the Menu, View then Code

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Step 11

Once in the Code View below the public MainPage() { … } the following should be entered:

public Library Library = new Library();

private void Open_Click(object sender, RoutedEventArgs e)
{
	Library.Open(Display);
}

private void Save_Click(object sender, RoutedEventArgs e)
{
	Library.Save();
}

private void Rotate_Click(object sender, RoutedEventArgs e)
{
	Library.Rotate(Display);
}

It should then appear as such:

2015-drag-and-drop-mainpage-code

Step 12

That completes the Universal Windows Application so Save the Project then select the Debug and Simulator option to run the Application

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Step 13

Once the Simulator has started the Application should then appear

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Step 14

After the Application has started running you can use Open to select a Photo to Rotate, you can then Save the rotated photo

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Step 15

To Exit the application select Stop Debugging in Visual Studio Community 2015

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Step 16

Another option is to run as a Windows 10 Mobile application, select Debug and select Emulator 10.0.10586.0 WVGA 4 inch 512MB option to run the Application

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Step 17

Once the Emulator has started the Application should then appear

2015-photo-rotate-emulator-run

Step 18

After the Application has started running you can use Open to select a Photo to Rotate, you can then Save the rotated photo

2015-photo-rotate-emulator-ran

Step 19

To Exit the application select Stop Debugging in Visual Studio Community 2015

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Creative Commons License

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