DrawingContext.PushOpacity DrawingContext.PushOpacity DrawingContext.PushOpacity DrawingContext.PushOpacity Method

Определение

Проталкивает заданный параметр непрозрачности в контекст рисования.Pushes the specified opacity setting onto the drawing context.

Перегрузки

PushOpacity(Double) PushOpacity(Double) PushOpacity(Double) PushOpacity(Double)

Проталкивает заданный параметр непрозрачности в контекст рисования.Pushes the specified opacity setting onto the drawing context.

PushOpacity(Double, AnimationClock) PushOpacity(Double, AnimationClock) PushOpacity(Double, AnimationClock) PushOpacity(Double, AnimationClock)

Проталкивает заданный параметр непрозрачности в контекст рисования и применяет заданные часы анимации.Pushes the specified opacity setting onto the drawing context and applies the specified animation clock.

PushOpacity(Double) PushOpacity(Double) PushOpacity(Double) PushOpacity(Double)

Проталкивает заданный параметр непрозрачности в контекст рисования.Pushes the specified opacity setting onto the drawing context.

public:
 abstract void PushOpacity(double opacity);
public abstract void PushOpacity (double opacity);
abstract member PushOpacity : double -> unit
Public MustOverride Sub PushOpacity (opacity As Double)

Параметры

opacity
Double Double Double Double

Коэффициент непрозрачности для применения к последующим командам рисования.The opacity factor to apply to subsequent drawing commands. Этот коэффициент кумулятивен с предыдущей операцией PushOpacity(Double).This factor is cumulative with previous PushOpacity(Double) operations.

Примеры

В следующем примере демонстрируются PushOpacityкоманды PushEffect, и Pop .The following example demonstrates the PushOpacity, PushEffect, and Pop commands.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Media.Effects;

namespace SDKSample
{


    public class PushEffectExample : Page
    {

        public PushEffectExample()
        {
            Pen shapeOutlinePen = new Pen(Brushes.Black, 2);
            shapeOutlinePen.Freeze();

            // Create a DrawingGroup
            DrawingGroup dGroup = new DrawingGroup();

            // Obtain a DrawingContext from 
            // the DrawingGroup.
            using (DrawingContext dc = dGroup.Open())
            {
                // Draw a rectangle at full opacity.
                dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, new Rect(0, 0, 25, 25));

                // Push an opacity change of 0.5. 
                // The opacity of each subsequent drawing will
                // will be multiplied by 0.5.
                dc.PushOpacity(0.5);

                // This rectangle is drawn at 50% opacity.
                dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, new Rect(25, 25, 25, 25));

                // Blurs subsquent drawings. 
                dc.PushEffect(new BlurBitmapEffect(), null);

                // This rectangle is blurred and drawn at 50% opacity (0.5 x 0.5). 
                dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, new Rect(50, 50, 25, 25));

                // This rectangle is also blurred and drawn at 50% opacity.
                dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, new Rect(75, 75, 25, 25));

                // Stop applying the blur to subsquent drawings.
                dc.Pop();

                // This rectangle is drawn at 50% opacity with no blur effect.
                dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, new Rect(100, 100, 25, 25));
            }

            // Display the drawing using an image control.
            Image theImage = new Image();
            DrawingImage dImageSource = new DrawingImage(dGroup);
            theImage.Source = dImageSource;

            this.Content = theImage;

        }




    }

}
Imports System.Windows.Media.Animation
Imports System.Windows.Media.Effects

Namespace SDKSample


	Public Class PushEffectExample
		Inherits Page

		Public Sub New()
			Dim shapeOutlinePen As New Pen(Brushes.Black, 2)
			shapeOutlinePen.Freeze()

			' Create a DrawingGroup
			Dim dGroup As New DrawingGroup()

			' Obtain a DrawingContext from 
			' the DrawingGroup.
			Using dc As DrawingContext = dGroup.Open()
				' Draw a rectangle at full opacity.
				dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(0, 0, 25, 25))

				' Push an opacity change of 0.5. 
				' The opacity of each subsequent drawing will
				' will be multiplied by 0.5.
				dc.PushOpacity(0.5)

				' This rectangle is drawn at 50% opacity.
				dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(25, 25, 25, 25))

				' Blurs subsquent drawings. 
                dc.PushEffect(New BlurBitmapEffect(), Nothing)

				' This rectangle is blurred and drawn at 50% opacity (0.5 x 0.5). 
				dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(50, 50, 25, 25))

				' This rectangle is also blurred and drawn at 50% opacity.
				dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(75, 75, 25, 25))

				' Stop applying the blur to subsquent drawings.
				dc.Pop()

				' This rectangle is drawn at 50% opacity with no blur effect.
				dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(100, 100, 25, 25))
			End Using

			' Display the drawing using an image control.
			Dim theImage As New Image()
			Dim dImageSource As New DrawingImage(dGroup)
			theImage.Source = dImageSource

			Me.Content = theImage

		End Sub




	End Class

End Namespace

Комментарии

Непрозрачность смешивается со всеми последующими командами рисования до тех пор Pop , пока она не будет удалена командой.The opacity is blended into all subsequent drawing commands until it is removed by the Pop command.

PushOpacity(Double, AnimationClock) PushOpacity(Double, AnimationClock) PushOpacity(Double, AnimationClock) PushOpacity(Double, AnimationClock)

Проталкивает заданный параметр непрозрачности в контекст рисования и применяет заданные часы анимации.Pushes the specified opacity setting onto the drawing context and applies the specified animation clock.

public:
 abstract void PushOpacity(double opacity, System::Windows::Media::Animation::AnimationClock ^ opacityAnimations);
public abstract void PushOpacity (double opacity, System.Windows.Media.Animation.AnimationClock opacityAnimations);
abstract member PushOpacity : double * System.Windows.Media.Animation.AnimationClock -> unit
Public MustOverride Sub PushOpacity (opacity As Double, opacityAnimations As AnimationClock)

Параметры

opacity
Double Double Double Double

Коэффициент непрозрачности для применения к последующим командам рисования.The opacity factor to apply to subsequent drawing commands. Этот коэффициент кумулятивен с предыдущей операцией PushOpacity(Double).This factor is cumulative with previous PushOpacity(Double) operations.

opacityAnimations
AnimationClock AnimationClock AnimationClock AnimationClock

Часы, с использованием которых следует анимировать значение непрозрачности, или null, чтобы анимация не выполнялась.The clock with which to animate the opacity value, or null for no animation. Эти часы должны быть созданы из AnimationTimeline, способного анимировать значения Double.This clock must be created from an AnimationTimeline that can animate Double values.

Комментарии

Непрозрачность смешивается со всеми последующими командами рисования до тех пор Pop , пока она не будет удалена командой.The opacity is blended into all subsequent drawing commands until it is removed by the Pop command.

Применяется к