RadialGradientBrush 类

定义

使用径向渐变绘制区域。Paints an area with a radial gradient. 焦点定义渐变的开始,而圆定义渐变的终点。A focal point defines the beginning of the gradient, and a circle defines the end point of the gradient.

public ref class RadialGradientBrush sealed : System::Windows::Media::GradientBrush
public sealed class RadialGradientBrush : System.Windows.Media.GradientBrush
type RadialGradientBrush = class
    inherit GradientBrush
Public NotInheritable Class RadialGradientBrush
Inherits GradientBrush
继承

注解

RadialGradientBrush 在对 LinearGradientBrush编程模型中是类似的。The RadialGradientBrush is similar in programming model to the LinearGradientBrush. 但是,线性渐变有一个开始点和终点来定义渐变向量,而径向渐变具有一个圆圈和一个焦点,用于定义渐变行为。However, the linear gradient has a start and an end point to define the gradient vector, while the radial gradient has a circle, along with a focal point, to define the gradient behavior. 圆圈定义渐变的终点。The circle defines the end point of the gradient. 换句话说,在1.0 的渐变停止点定义圆的周长的颜色。In other words, a gradient stop at 1.0 defines the color at the circle's circumference. 焦点定义渐变的中心。The focal point defines the center of the gradient. 位于0.0 的渐变停止点定义焦点处的颜色。A gradient stop at 0.0 defines the color at the focal point.

下图显示了用径向渐变填充的矩形。The following image shows a rectangle filled with a radial gradient. 从白色到灰色的径向渐变。The radial gradient that goes from white to gray. 外圆圈表示渐变圆,而红点表示焦点。The outside circle represents the gradient circle while the red dot denotes the focal point. 此渐变将其 SpreadMethod 设置为 PadThis gradient has its SpreadMethod set to Pad.

具有突出显示的组件的径向渐变A radial gradient with highlighted components
突出显示了焦点的径向渐变Radial gradient with a highlighted focal point

备注

RadialGradientBrush 对象是使用 Tier 2 系统上的硬件加速呈现的。RadialGradientBrush objects are rendered using hardware acceleration on Tier 2 systems. 有关硬件层的详细信息,请参阅图形呈现层For more information about hardware tiers, see Graphics Rendering Tiers.

Freezable 功能Freezable Features

因为它继承自 Freezable 类,所以 RadialGradientBrush 类提供若干特殊功能: RadialGradientBrush 对象可以声明为、在多个对象之间共享、变为只读以提高性能、克隆以及使线程安全。Because it inherits from the Freezable class, the RadialGradientBrush class provides several special features: RadialGradientBrush objects can be declared as , shared among multiple objects, made read-only to improve performance, cloned, and made thread safe. 有关 Freezable 对象提供的不同功能的详细信息,请参阅可冻结对象概述For more information about the different features provided by Freezable objects, see Freezable Objects Overview.

构造函数

RadialGradientBrush()

初始化 RadialGradientBrush 类的新实例。Initializes a new instance of the RadialGradientBrush class.

RadialGradientBrush(Color, Color)

使用指定的起点和终点颜色初始化 RadialGradientBrush 类的新实例。Initializes a new instance of the RadialGradientBrush class with the specified start and stop colors.

RadialGradientBrush(GradientStopCollection)

初始化 RadialGradientBrush 类的新实例,该实例具有指定的渐变停止点。Initializes a new instance of the RadialGradientBrush class that has the specified gradient stops.

字段

CenterProperty

标识 Center 依赖项属性。Identifies the Center dependency property.

GradientOriginProperty

标识 GradientOrigin 依赖项属性。Identifies the GradientOrigin dependency property.

RadiusXProperty

标识 RadiusX 依赖项属性。Identifies the RadiusX dependency property.

RadiusYProperty

标识 RadiusY 依赖项属性。Identifies the RadiusY dependency property.

属性

CanFreeze

获取一个值,该值指示是否可将对象变为不可修改。Gets a value that indicates whether the object can be made unmodifiable.

(继承自 Freezable)
Center

获取或设置径向渐变的最外面圆的中心。Gets or sets the center of the outermost circle of the radial gradient.

ColorInterpolationMode

获取或设置一个 ColorInterpolationMode 枚举,该枚举指定内插渐变颜色的方式。Gets or sets a ColorInterpolationMode enumeration that specifies how the gradient's colors are interpolated.

(继承自 GradientBrush)
DependencyObjectType

获取对此实例的 DependencyObjectType 类型进行包装的 CLRCLRGets the DependencyObjectType that wraps the CLRCLR type of this instance.

(继承自 DependencyObject)
Dispatcher

获取与此 Dispatcher 关联的 DispatcherObjectGets the Dispatcher this DispatcherObject is associated with.

(继承自 DispatcherObject)
GradientOrigin

获取或设置用于定义渐变开始的二维焦点的位置。Gets or sets the location of the two-dimensional focal point that defines the beginning of the gradient.

GradientStops

获取或设置画笔的渐变停止点。Gets or sets the brush's gradient stops.

(继承自 GradientBrush)
HasAnimatedProperties

获取一个值,该值指示一个或多个 AnimationClock 对象是否与此对象的任何依赖项属性相关联。Gets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties.

(继承自 Animatable)
IsFrozen

获取一个值,该值指示对象当前是否可修改。Gets a value that indicates whether the object is currently modifiable.

(继承自 Freezable)
IsSealed

获取一个值,该值指示此实例当前是否为密封的(只读)。Gets a value that indicates whether this instance is currently sealed (read-only).

(继承自 DependencyObject)
MappingMode

获取或设置一个 BrushMappingMode 枚举,该枚举指定渐变画笔定位坐标是绝对的还是相对于输出区的。Gets or sets a BrushMappingMode enumeration that specifies whether the gradient brush's positioning coordinates are absolute or relative to the output area.

(继承自 GradientBrush)
Opacity

获取或设置 Brush 的不透明度。Gets or sets the degree of opacity of a Brush.

(继承自 Brush)
RadiusX

获取或设置径向渐变的最外面圆的水平半径。Gets or sets the horizontal radius of the outermost circle of the radial gradient.

RadiusY

获取或设置径向渐变的最外面圆的垂直半径。Gets or sets the vertical radius of the outermost circle of a radial gradient.

RelativeTransform

获取或设置使用相对坐标应用到画笔的转换。Gets or sets the transformation that is applied to the brush using relative coordinates.

(继承自 Brush)
SpreadMethod

获取或设置涂抹方法的类型,该方法指定如何绘制出在要绘画的对象的边界内起始或结束的渐变效果。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.

(继承自 GradientBrush)
Transform

获取或设置应用于画笔的转换。Gets or sets the transformation that is applied to the brush. 此转换在完成画笔输出的映射和定位后应用。This transformation is applied after the brush's output has been mapped and positioned.

(继承自 Brush)

方法

ApplyAnimationClock(DependencyProperty, AnimationClock)

AnimationClock 应用到指定的 DependencyPropertyApplies an AnimationClock to the specified DependencyProperty. 如果该属性已进行动画处理,则使用 SnapshotAndReplace 切换行为。If the property is already animated, the SnapshotAndReplace handoff behavior is used.

(继承自 Animatable)
ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)

AnimationClock 应用到指定的 DependencyPropertyApplies an AnimationClock to the specified DependencyProperty. 如果该属性已进行动画处理,则使用指定的 HandoffBehaviorIf the property is already animated, the specified HandoffBehavior is used.

(继承自 Animatable)
BeginAnimation(DependencyProperty, AnimationTimeline)

将动画应用于指定 DependencyPropertyApplies an animation to the specified DependencyProperty. 动画会在呈现下一帧时启动。The animation is started when the next frame is rendered. 如果指定属性已进行动画处理,则使用 SnapshotAndReplace 切换行为。If the specified property is already animated, the SnapshotAndReplace handoff behavior is used.

(继承自 Animatable)
BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)

将动画应用于指定 DependencyPropertyApplies an animation to the specified DependencyProperty. 动画会在呈现下一帧时启动。The animation is started when the next frame is rendered. 如果指定的属性已进行动画处理,则使用指定的 HandoffBehaviorIf the specified property is already animated, the specified HandoffBehavior is used.

(继承自 Animatable)
CheckAccess()

确定调用线程是否可以访问此 DispatcherObjectDetermines whether the calling thread has access to this DispatcherObject.

(继承自 DispatcherObject)
ClearValue(DependencyProperty)

清除属性的本地值。Clears the local value of a property. 要清除的属性由 DependencyProperty 标识符指定。The property to be cleared is specified by a DependencyProperty identifier.

(继承自 DependencyObject)
ClearValue(DependencyPropertyKey)

清除只读属性的本地值。Clears the local value of a read-only property. 要清除的属性由 DependencyPropertyKey 指定。The property to be cleared is specified by a DependencyPropertyKey.

(继承自 DependencyObject)
Clone()

创建此 RadialGradientBrush 的可修改克隆,从而深度复制此对象的值。Creates a modifiable clone of this RadialGradientBrush, making deep copies of this object's values. 在复制依赖项属性时,此方法会复制资源引用和数据绑定(但可能不再解析),但不复制动画或其当前值。When copying dependency properties, this method copies resource references and data bindings (but they might no longer resolve) but not animations or their current values.

CloneCore(Freezable)

使用基(未经过动画处理的)属性值使该实例成为指定 Freezable 的克隆(深层复制)。Makes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values.

(继承自 Freezable)
CloneCurrentValue()

创建此 RadialGradientBrush 对象的可修改复本,从而深度复制此对象的当前值。Creates a modifiable clone of this RadialGradientBrush object, making deep copies of this object's current values. 不复制资源引用、数据绑定和动画,而是复制其当前值。Resource references, data bindings, and animations are not copied, but their current values are.

CloneCurrentValueCore(Freezable)

使用当前属性值使该实例成为指定 Freezable 的可修改克隆(深层复制)。Makes the instance a modifiable clone (deep copy) of the specified Freezable using current property values.

(继承自 Freezable)
CoerceValue(DependencyProperty)

对指定依赖属性的值进行强制。Coerces the value of the specified dependency property. 通过对调用方 CoerceValueCallback 上存在的依赖属性的属性元数据中所指定的任何 DependencyObject 函数进行调用来完成此操作。This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.

(继承自 DependencyObject)
CreateInstance()

初始化 Freezable 类的新实例。Initializes a new instance of the Freezable class.

(继承自 Freezable)
CreateInstanceCore()

在派生类中实现时,创建 Freezable 派生类的新实例。When implemented in a derived class, creates a new instance of the Freezable derived class.

(继承自 Freezable)
Equals(Object)

确定提供的 DependencyObject 是否等效于当前 DependencyObjectDetermines whether a provided DependencyObject is equivalent to the current DependencyObject.

(继承自 DependencyObject)
Freeze()

使当前对象不可修改,并且将其 IsFrozen 属性设置为 trueMakes the current object unmodifiable and sets its IsFrozen property to true.

(继承自 Freezable)
FreezeCore(Boolean)

使此 Animatable 对象成为不可修改的对象,或确定是否可使其成为不可修改的对象。Makes this Animatable object unmodifiable or determines whether it can be made unmodifiable.

(继承自 Animatable)
GetAnimationBaseValue(DependencyProperty)

返回指定的 DependencyProperty 的未经过动画处理的值。Returns the non-animated value of the specified DependencyProperty.

(继承自 Animatable)
GetAsFrozen()

使用基(未经过动画处理的)属性值创建 Freezable 的冻结副本。Creates a frozen copy of the Freezable, using base (non-animated) property values. 由于副本已冻结,因此将通过引用复制任何冻结的子对象。Because the copy is frozen, any frozen sub-objects are copied by reference.

(继承自 Freezable)
GetAsFrozenCore(Freezable)

让该实例成为指定的 Freezable 的冻结克隆,前者使用基(非动画的)属性值。Makes the instance a frozen clone of the specified Freezable using base (non-animated) property values.

(继承自 Freezable)
GetCurrentValueAsFrozen()

使用当前属性值创建 Freezable 的冻结副本。Creates a frozen copy of the Freezable using current property values. 由于副本已冻结,因此将通过引用复制任何冻结的子对象。Because the copy is frozen, any frozen sub-objects are copied by reference.

(继承自 Freezable)
GetCurrentValueAsFrozenCore(Freezable)

使当前实例成为指定的 Freezable 的冻结复本。Makes the current instance a frozen clone of the specified Freezable. 如果对象具有动画依赖属性,则复制其当前的动画值。If the object has animated dependency properties, their current animated values are copied.

(继承自 Freezable)
GetHashCode()

获取此 DependencyObject 的哈希代码。Gets a hash code for this DependencyObject.

(继承自 DependencyObject)
GetLocalValueEnumerator()

创建一个专用的枚举数,用于确定哪些依赖项属性在此 DependencyObject 上具有以本地方式设置的值。Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject.

(继承自 DependencyObject)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
GetValue(DependencyProperty)

DependencyObject 的此实例返回依赖属性的当前有效值。Returns the current effective value of a dependency property on this instance of a DependencyObject.

(继承自 DependencyObject)
InvalidateProperty(DependencyProperty)

重新评估指定依赖属性的有效值。Re-evaluates the effective value for the specified dependency property.

(继承自 DependencyObject)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
OnChanged()

修改当前 Freezable 对象时调用。Called when the current Freezable object is modified.

(继承自 Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject)

确保为刚刚设置的 DependencyObjectType 数据成员建立适当的上下文指针。Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set.

(继承自 Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)

此成员支持 Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) 基础结构,但不能在代码中直接使用。This member supports the Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.

(继承自 Freezable)
OnPropertyChanged(DependencyPropertyChangedEventArgs)

重写 OnPropertyChanged(DependencyPropertyChangedEventArgs)DependencyObject 实现,以同时调用任何响应类型 Freezable 不断变化的依赖属性的 Changed 处理程序。Overrides the DependencyObject implementation of OnPropertyChanged(DependencyPropertyChangedEventArgs) to also invoke any Changed handlers in response to a changing dependency property of type Freezable.

(继承自 Freezable)
ReadLocalValue(DependencyProperty)

如果存在,则返回依赖属性的本地值。Returns the local value of a dependency property, if it exists.

(继承自 DependencyObject)
ReadPreamble()

确保正在从有效的线程访问 FreezableEnsures that the Freezable is being accessed from a valid thread. Freezable 的继承者必须在任何 API 一开始读取不属于依赖项对象的数据成员时调用此方法。Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties.

(继承自 Freezable)
SetCurrentValue(DependencyProperty, Object)

设置依赖属性的值而不更改其值源。Sets the value of a dependency property without changing its value source.

(继承自 DependencyObject)
SetValue(DependencyProperty, Object)

设置依赖属性的本地值,该值由其依赖属性标识符指定。Sets the local value of a dependency property, specified by its dependency property identifier.

(继承自 DependencyObject)
SetValue(DependencyPropertyKey, Object)

设置一个只读依赖属性的本地值,该值由依赖属性的 DependencyPropertyKey 标识符指定。Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property.

(继承自 DependencyObject)
ShouldSerializeProperty(DependencyProperty)

返回一个值,该值指示序列化进程是否应序列化所提供的依赖属性的值。Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.

(继承自 DependencyObject)
ToString()

返回此 Brush 的字符串表示形式。Return string representation of this Brush.

(继承自 Brush)
ToString(IFormatProvider)

基于指定的区域性特定格式设置信息创建此对象的字符串表示形式。Creates a string representation of this object based on the specified culture-specific formatting information.

(继承自 Brush)
VerifyAccess()

强制调用线程具有此 DispatcherObject 的访问权限。Enforces that the calling thread has access to this DispatcherObject.

(继承自 DispatcherObject)
WritePostscript()

引发 FreezableChanged 事件并调用其 OnChanged() 方法。Raises the Changed event for the Freezable and invokes its OnChanged() method. Freezable 派生的类应在修改的类成员不存储为依赖属性的任何 API 的末尾调用此方法。Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties.

(继承自 Freezable)
WritePreamble()

验证 Freezable 是否未被冻结,并且是否正在从有效的线程上下文中访问它。Verifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable 的继承项应当在任何 API 一开始写入不属于依赖项属性的数据成员时调用此方法。Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties.

(继承自 Freezable)

事件

Changed

在修改 Freezable 或其包含的对象时发生。Occurs when the Freezable or an object it contains is modified.

(继承自 Freezable)

显式接口实现

IFormattable.ToString(String, IFormatProvider)

使用指定格式对当前实例的值设置格式。Formats the value of the current instance using the specified format.

(继承自 Brush)

适用于

另请参阅