ソースコード
App.xaml
<Application x:Class="HelloWorld.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="MainWindow.xaml"> </Application>
MainWindow.xaml
<Window x:Class="HelloWold.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="200" Width="300"> <Canvas Width="100" Height="100" Background="Orange"> <!-- Canvasのすべての要素に透明性が適用される --> <Canvas.OpacityMask> <LinearGradientBrush StartPoint="0, 1" EndPoint="1, 0"> <LinearGradientBrush.GradientStops> <GradientStop Offset="0" Color="#FFFF0000" /> <GradientStop Offset="0.33" Color="#00000000" /> <GradientStop Offset="0.66" Color="#FF000000" /> <GradientStop Offset="0.9" Color="#22000000" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Canvas.OpacityMask> <Rectangle Canvas.Top="0" Canvas.Left="0" Width="50" Height="50" Fill="Red" /> <Rectangle Canvas.Top="50" Canvas.Left="50" Width="50" Height="50" Fill="Blue" /> <Button Canvas.Top="60" Canvas.Left="25">こんにちは</Button> </Canvas> </Window>