Paints an area with a linear gradient.
<LinearGradientBrush ...> oneOrMoreGradientStops </LinearGradientBrush
The LinearGradientBrush class has these types of members:
The LinearGradientBrush class has these constructors.
|LinearGradientBrush()||Initializes a new instance of the LinearGradientBrush class.|
|LinearGradientBrush(GradientStopCollection, Double)||Initializes a new instance of the LinearGradientBrush class that has the specified GradientStopCollection and angle.|
The LinearGradientBrush class has these methods. It also inherits methods from the Object class.
|ClearValue||Clears the local value of a dependency property. (Inherited from DependencyObject)|
|GetAnimationBaseValue||Returns any base value established for a dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject)|
|GetValue||Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject)|
|ReadLocalValue||Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject)|
|SetValue||Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject)|
The LinearGradientBrush class has these properties.
|Read/write||Gets or sets a ColorInterpolationMode enumeration value that specifies how the gradient's colors are interpolated. (Inherited from GradientBrush)|
|Read-only||Gets the CoreDispatcher that this object is associated with. (Inherited from DependencyObject)|
|Read/write||Gets or sets the ending two-dimensional coordinates of the linear gradient.|
|Read-only||Identifies the EndPoint dependency property.|
|Read/write||Gets or sets the brush's gradient stops. (Inherited from GradientBrush)|
|Read/write||Gets or sets a BrushMappingMode enumeration value that specifies whether the positioning coordinates of the gradient brush are absolute or relative to the output area. (Inherited from GradientBrush)|
|Read/write||Gets or sets the degree of opacity of a Brush. (Inherited from Brush)|
|Read/write||Gets or sets the transformation that is applied to the brush using relative coordinates. (Inherited from Brush)|
|Read/write||Gets or sets the type of spread method that specifies how to draw a gradient that starts or ends inside the bounds of the object to be painted. (Inherited from GradientBrush)|
|Read/write||Gets or sets the starting two-dimensional coordinates of the linear gradient.|
|Read-only||Identifies the StartPoint dependency property.|
|Read/write||Gets or sets the transformation that is applied to the brush. (Inherited from Brush)|
LinearGradientBrush is a type of Brush that is used for many possible UI properties that use a Brush to fill some or all of an object's visual area in app UI. Examples of some of the most commonly-used properties that use a Brush value include: Control.Background, Control.Foreground, Shape.Fill, Control.BorderBrush, Panel.Background, TextBlock.Foreground. LinearGradientBrush is an alternative to the more commonly used SolidColorBrush type.
The StartPoint and EndPoint properties of LinearGradientBrush describe two points in a relative coordinate space. This creates an orientation for the gradient, and typically this specifies a horizontal gradient, or a vertical gradient. A diagonal gradient can also be used. A LinearGradientBrush typically has two or more GradientStop values for the GradientStops property (an ordered collection). Each GradientStop specifies a Color and an Offset. Offset represents a position between 0 (the StartPoint) and 1 (the EndPoint) along the gradient, and the actual pixel length of the brush and its gradient are adjusted based on the UI where you apply your LinearGradientBrush as a value. For more info on how Offset values are defined and how Offset, StartPoint and EndPoint are related, see Quickstart: Using brushes. It's common to use
You can use the Transparent value for one of the GradientStop colors. Although this doesn't visually apply any changes to UI (it's transparent), that point is detectable for hit-testing purposes. For more info on hit testing, see "Hit testing" section of Responding to mouse interactions.
The GradientStop values of a LinearGradientBrush can be animated as part of transitions or decorative animations. Use one of the dedicated animation types that can animate a Color value. This usually involves having
.(GradientStop.Color) be a part of a longer property path for a Storyboard.TargetProperty value. For more info on property targeting and how to animate properties that use Brush values, see Storyboarded animations.
Each of the Brush types that can be declared in XAML (SolidColorBrush, LinearGradientBrush, ImageBrush) is intended to be defined as a resource, so that you can reuse that brush as a resource throughout your app. The XAML syntax shown for Brush types is appropriate for defining the brush as a resource. When you declare a brush as a resource, you also need an x:Key attribute that you'll later use to refer to that resource from other UI definitions. For more info on XAML resources and how to use x:Key, see ResourceDictionary and XAML resource references.
The advantage of declaring brushes as resources is that it reduces the number of runtime objects that are needed to construct a UI: the brush is now shared as a common resource that's providing values for multiple parts of the object graph.
If you look at the existing control template definitions for Windows Runtime XAML controls, you'll see that the templates use brush resources extensively (although these are usually SolidColorBrush, not LinearGradientBrush). Many of these resources are system resources, and they use the ThemeResource markup extension for the resource reference rather than StaticResource. For more info on how to use system resource brushes in your own control template XAML, see XAML theme resources reference.
This example creates a linear gradient with four colors and uses it to paint a Rectangle.
<StackPanel> <!-- This rectangle is painted with a vertical linear gradient. --> <Rectangle Width="200" Height="100"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0.5,0" EndPoint="0.5,1"> <GradientStop Color="Yellow" Offset="0.0" /> <GradientStop Color="Red" Offset="0.25" /> <GradientStop Color="Blue" Offset="0.75" /> <GradientStop Color="LimeGreen" Offset="1.0" /> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> </StackPanel>
This illustration shows the resulting gradient. The gradient axis is marked with a dashed line and the gradient stops are marked with circles.
Minimum supported client
|Windows 8 [Windows Store apps only]|
Minimum supported server
|Windows Server 2012 [Windows Store apps only]|
Minimum supported phone
|Windows Phone 8.1 [Windows Runtime apps only]|
- Quickstart: Using brushes
- ResourceDictionary and XAML resource references