Universal Windows Platform – Shade Effect

Step 1

If not already, follow Setup and Start on how to Install and get Started with Visual Studio 2017 or in Windows 10 choose Start, and then from the Start Menu locate and select Visual Studio 2017.

vs2017-home

Step 2

Once Visual Studio Community 2017 has started, from the Menu choose File, then New then Project…

vs2017-file-new-project

Step 3

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

vs2017-new-project

Step 4

Then in New Universal Windows Project you need to select the Target Version to be Windows 10 Creators Update (10.0; Build 15063) and the Minimum Version to be at least Windows 10 Anniversary Update (10.0; Build 14393) or Windows 10 Creators Update (10.0; Build 15063)

vs2017-platform

Step 5

In the Solution Explorer select MainPage.xaml

vs2017-mainpage

Step 6

From the Menu choose View and then Designer

vs2017-view-designer

Step 7

The Design View will be displayed along with the XAML View and in this between the Grid and /Grid elements, enter the following XAML:

<CommandBar IsOpen="True" VerticalAlignment="Bottom">
	<AppBarButton Name="Accept" Icon="Accept" Label="Accept" Click="Accept_Click"/>
	<AppBarButton Name="Clear" Icon="Cancel" Label="Clear" Click="Clear_Click"/>
</CommandBar>
<Grid Height="300" Width="300">
	<Border x:Name="ShadowElement"/>
	<Path Name="Logo" Fill="#FF68217A" Stretch="Uniform" 
		Data="M27.021,0l8.897,3.592v28.815L26.938,36L12.653,21.796l-9.061,7.021L0,27.021V8.979l3.592-1.714l9.061,7.102 
		L27.021,0z M3.592,12.653v10.939l5.388-5.551L3.592,12.653z M17.633,18.041l9.306,7.348V10.693L17.633,18.041z">
	</Path>
</Grid>

It should appear as such:

xaml-shade-effect

Step 8

From the Menu choose View and then Code

vs2017-view-code

Step 9

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

private Windows.UI.Composition.SpriteVisual spriteVisual;

private Windows.UI.Composition.Compositor Compositor
{
	get
	{
		return Windows.UI.Xaml.Hosting.ElementCompositionPreview.GetElementVisual(Logo).Compositor;
	}
}

private void Accept_Click(object sender, RoutedEventArgs e)
{
	spriteVisual = Compositor.CreateSpriteVisual();
	spriteVisual.Size = new System.Numerics.Vector2((float)Logo.ActualWidth, (float)Logo.ActualHeight);
	Windows.UI.Composition.DropShadow shadow = Compositor.CreateDropShadow();
	shadow.Color = Windows.UI.Colors.Black;
	shadow.Offset = new System.Numerics.Vector3(10, 10, 0);
	shadow.Mask = Logo.GetAlphaMask();
	spriteVisual.Shadow = shadow;
	Windows.UI.Xaml.Hosting.ElementCompositionPreview.SetElementChildVisual(ShadowElement, spriteVisual);
}

private void Clear_Click(object sender, RoutedEventArgs e)
{
	spriteVisual.Shadow = null;
}

It should then appear as such:

code-shade-effect

Step 10

That completes the Universal Windows Application so Save the Project then in Visual Studio select the Local Machine to run the Application

vs2017-debug

Step 11

Once started the Application should then appear

run-shade-effect

Step 12

After the Application has started running you can then select Accept to enable the Shade Effect or use Clear to remove the effect

ran-shade-effect

Step 13

To Exit the application select Stop in Visual Studio

vs2017-stop

Creative Commons License

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2 thoughts on “Universal Windows Platform – Shade Effect

  1. Thanks for your tutorial! and i found a bug in this code, that if i click cancel first, the app will crush, warning that object reference not set to an instance of an object.
    so i try to fix it on my own, finally i rewrite the function “clear_click”as following:

    private void Clear_Click(object sender, RoutedEventArgs e)
    {
    if (pointLight != null)
    {
    pointLight.Targets.RemoveAll();
    }
    }

    and then it works.

    finally thx again!

    Like

    • Indeed, should be a null-check there – think I caught this during pre-production of these tutorials (yes the light effect would have the same bug) but I can’t recall if the bug was left intentionally as an exercise or not but either way I’ll fix this one as it’s quite an obvious omission!

      Like

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