Transparency using Alpha Channel in XAML Silverlight


Introduction

In Silverlight we can apply transparency either by using Alpha Channel or Opacity. In this post you will learn how to apply trnsparency using Alpha Channel.

As I have discussed in my previous post titled 'Alpha Channel in XAML Silverlight' about the Alpha Chennel. Take a little look here too.

In Alpha Channel we just add additional code as first element in existing hexadecimal color code. The additional element specifies the transparency of a color from 0 (full transparent) to 255 (full opaque). For example, if we wish to apply 'Blue' color then we'll use its hexadecimal color code as '#0000FF'. Now to apply the transcarency in this color we add additional element (from 0 to 255 (FF). FF is default means no transparency) as '#FF0000FF' (no transparency). Let's take a look at program.


In above screenshot, I marked out the Alpha Channel and normal HTML based hexa color code.

In above example, I have used a textblock and 5 rectangles overlapped on text but to show the transparency I have used alpha channel there.

XAML Code

<Grid
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
          x:Class="SilverlightApplication1.MainPage"
          Width="640" Height="480">
         
          <!--TextBlock with text-->
          <TextBlock Text="ITORIAN.COM/ABOUT" FontSize="50"/>
         
          <!--4 circle with partially transparent background-->
          <Rectangle Width="80" Height="100" Fill="#19FF0000" VerticalAlignment="Top" HorizontalAlignment="Left"/>
          <Rectangle Width="80" Height="100" Fill="#4CFF0000" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="104,0,0,0"/>
          <Rectangle Width="80" Height="100" Fill="#7FFF0000" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="206,0,0,0"/>
          <Rectangle Width="80" Height="100" Fill="#CCFF0000" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="310,0,250,0"/>
          <Rectangle Width="80" Height="100" Fill="#CCFF0000" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="415,0,0,0"/>
</Grid>

Be tuned for next post.

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