ImageAnimator.Animate(Image, EventHandler) Metoda

Definice

Obor názvů:

System.Drawing

Sestavení:

System.Drawing.Common.dll

Balíček:

System.Drawing.Common v8.0.0

Zdroj:

ImageAnimator.cs

Zobrazí obrázek s více snímky jako animaci.

public:
 static void Animate(System::Drawing::Image ^ image, EventHandler ^ onFrameChangedHandler);

public static void Animate (System.Drawing.Image image, EventHandler onFrameChangedHandler);

static member Animate : System.Drawing.Image * EventHandler -> unit

Public Shared Sub Animate (image As Image, onFrameChangedHandler As EventHandler)

Parametry

image

Image

Objekt Image , který se má animovat.

onFrameChangedHandler

EventHandler

Objekt EventHandler , který určuje metodu, která je volána při změně rámce animace.

Příklady

Tato model Windows Forms aplikace ukazuje, jak na obrazovku nakreslit animovaný obrázek. Obrázek se vytvoří z animovaného souboru GIF, SampleAnimation.gif se nachází ve stejné složce jako aplikace.

#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;

public ref class AnimateImageForm : public Form 
{

    // Create a Bitmap Object.
private:
    Bitmap^ animatedImage;
private:
    bool currentlyAnimating;

public:
    AnimateImageForm()
    {
        try
        {
            animatedImage = gcnew Bitmap("SampleAnimation.gif");
        }
        catch (ArgumentException^)
        {
            MessageBox::Show("Could not read the image file " +
                "\"SampleAnimation.gif\",\n" +
                "or it is not a valid image file.");
        }
    }

    // This method begins the animation.
public:
    void AnimateImage() 
    {
        // Begin the animation only once.
        // Make sure to animate only if animatedImage was
        // successfully initialised.
        if (!currentlyAnimating && animatedImage != nullptr)
        {
            ImageAnimator::Animate(animatedImage,
                gcnew EventHandler(this, &AnimateImageForm::OnFrameChanged));
            currentlyAnimating = true;
        }
    }

private:
    void OnFrameChanged(Object^ , EventArgs^ ) 
    {
        // Force a call to the Paint event handler.
        this->Invalidate();
    }

protected:
    virtual void OnPaint(PaintEventArgs^ e) override
    {
        // Begin the animation.
        AnimateImage();

        // Get the next frame ready for rendering.
        ImageAnimator::UpdateFrames();

        if (animatedImage != nullptr)
        {
            // Draw the next frame in the animation.
            e->Graphics->DrawImage(this->animatedImage,
                Point(0, 0));
        }
    }
};

[STAThread]
int main()
{
    Application::Run(gcnew AnimateImageForm());
}

using System;
using System.Drawing;
using System.Windows.Forms;

public class animateImage : Form 
{
                     
    //Create a Bitmpap Object.
    Bitmap animatedImage = new Bitmap("SampleAnimation.gif");
    bool currentlyAnimating = false;
                     
    //This method begins the animation.
    public void AnimateImage() 
    {
        if (!currentlyAnimating) 
        {
                     
            //Begin the animation only once.
            ImageAnimator.Animate(animatedImage, new EventHandler(this.OnFrameChanged));
            currentlyAnimating = true;
        }
    }

    private void OnFrameChanged(object o, EventArgs e) 
    {
                     
        //Force a call to the Paint event handler.
        this.Invalidate();
    }

    protected override void OnPaint(PaintEventArgs e) 
    {
                     
        //Begin the animation.
        AnimateImage();
                     
        //Get the next frame ready for rendering.
        ImageAnimator.UpdateFrames();
                     
        //Draw the next frame in the animation.
        e.Graphics.DrawImage(this.animatedImage, new Point(0, 0));
    }

    public static void Main() 
    {
        Application.Run(new animateImage());
    }
}

Imports System.Drawing
Imports System.Windows.Forms

Public Class animateImage
    Inherits Form

    'Create a Bitmpap Object.
    Private animatedImage As New Bitmap("SampleAnimation.gif")
    Private currentlyAnimating As Boolean = False

    'This method begins the animation.
    Public Sub AnimateImage()
        If Not currentlyAnimating Then

            'Begin the animation only once.
            ImageAnimator.Animate(animatedImage, _
            New EventHandler(AddressOf Me.OnFrameChanged))
            currentlyAnimating = True
        End If
    End Sub

    Private Sub OnFrameChanged(ByVal o As Object, ByVal e As EventArgs)

        'Force a call to the Paint event handler.
        Me.Invalidate()
    End Sub

    Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)

        'Begin the animation.
        AnimateImage()

        'Get the next frame ready for rendering.
        ImageAnimator.UpdateFrames()

        'Draw the next frame in the animation.
        e.Graphics.DrawImage(Me.animatedImage, New Point(0, 0))
    End Sub

    Public Shared Sub Main()
        Application.Run(New AnimateImage)
    End Sub
End Class

Poznámky

Poznámka

V rozhraní .NET 6 a novějších verzích je balíček System.Drawing.Common, který obsahuje tento typ, podporován pouze v operačních systémech Windows. Použití tohoto typu v multiplatformních aplikacích způsobuje upozornění na kompilaci a výjimky za běhu. Další informace najdete v tématu System.Drawing.Common podporované pouze ve Windows.