LinearGradientBrush 类

定义

使用线性渐变绘制区域。Paints an area with a linear gradient.

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

注解

使用线性渐变绘制区域。 LinearGradientBrushA LinearGradientBrush paints an area with a linear gradient. 线性渐变沿直线定义渐变。A linear gradient defines a gradient along a line. 线条的终点由线性渐变的StartPointEndPoint属性定义。The line's end points are defined by the StartPoint and EndPoint properties of the linear gradient. 画笔沿这一线绘制其GradientStopsLinearGradientBrushA LinearGradientBrush brush paints its GradientStops along this line.

默认的线性渐变是对角。The default linear gradient is diagonal. 默认情况下, StartPoint线性渐变的是 (0, 0), 要绘制的区域的左上角, 其EndPoint为 (1, 1), 即绘制区域的右下角。In the default, the StartPoint of a linear gradient is (0,0), the upper-left corner of the area being painted, and its EndPoint is (1,1), the lower-right corner of the area being painted. 生成的渐变中的颜色沿对角路径内插。The colors in the resulting gradient are interpolated along the diagonal path.

下图显示对角渐变。The following illustration shows a diagonal gradient. 添加了一条线, 以突出显示从起点到终点的渐变的内插路径。A line was added to highlight the interpolation path of the gradient from the start point to the end point.

对角方向线性渐变的渐变轴Gradient axis for a diagonal linear gradient
对角线方向线性渐变A diagonal linear gradient

下图显示了相同的线性渐变, 但具有突出显示的渐变停止点。The next illustration shows the same linear gradient, but with highlighted gradient stops.

线性渐变中的渐变停止点Gradient stops in a linear gradient
具有突出显示梯度停止点的对角线性渐变A diagonal linear gradient with highlighted gradient stops

可以指定不完全填充要绘制的区域的渐变轴。It is possible to specify a gradient axis that does not completely fill area being painted. 出现这种情况时SpreadMethod , 属性将确定如何绘制剩余区域。When this occurs, the SpreadMethod property determines how the remaining area is painted.

Freezable 功能Freezable Features

LinearGradientBrush是一Freezable种对象类型, 因此可将其冻结以提高性能。A LinearGradientBrush is a type of Freezable object and therefore can be frozen to improve performance. 有关Freezable功能 (如冻结和克隆) 的信息, 请参阅 "冻结对象概述"。For information about Freezable features, such as freezing and cloning, see Freezable Objects Overview.

构造函数

LinearGradientBrush()

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

LinearGradientBrush(Color, Color, Double)

初始化 LinearGradientBrush 类的一个新实例,该实例具有指定的起始 Color、结束 Color 和角度。Initializes a new instance of the LinearGradientBrush class that has the specified start Color, end Color, and angle.

LinearGradientBrush(Color, Color, Point, Point)

初始化 LinearGradientBrush 类的一个新实例,该实例具有指定的起始 Color、结束 ColorStartPointEndPointInitializes a new instance of the LinearGradientBrush class that has the specified start Color, end Color, StartPoint, and EndPoint.

LinearGradientBrush(GradientStopCollection)

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

LinearGradientBrush(GradientStopCollection, Double)

初始化 LinearGradientBrush 类的一个新实例,该实例具有指定的 GradientStopCollection 和角度。Initializes a new instance of the LinearGradientBrush class that has the specified GradientStopCollection and angle.

LinearGradientBrush(GradientStopCollection, Point, Point)

初始化 LinearGradientBrush 类的一个新实例,该实例具有指定的渐变停止点、StartPointEndPointInitializes a new instance of the LinearGradientBrush class that has the specified gradient stops, StartPoint, and EndPoint.

字段

EndPointProperty

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

StartPointProperty

标识 StartPoint 依赖项属性。Identifies the StartPoint 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)
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 CLRCLR 类型进行包装的 DependencyObjectTypeGets 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)
EndPoint

获取或设置线性渐变的二维终止坐标。Gets or sets the ending two-dimensional coordinates of the linear 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)
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)
StartPoint

获取或设置线性渐变的二维起始坐标。Gets or sets the starting two-dimensional coordinates of the linear gradient.

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 LinearGradientBrush 的可修改克隆,从而深度复制此对象的值。Creates a modifiable clone of this LinearGradientBrush, 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 LinearGradientBrush 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 LinearGradientBrush 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 DependencyObject 上存在的依赖属性的属性元数据中所指定的任何 CoerceValueCallback 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)

显式界面实现

IFormattable.ToString(String, IFormatProvider)

使用指定的格式格式化当前实例的值。Formats the value of the current instance using the specified format.

(继承自 Brush)

适用于

另请参阅