ImageAnimator.Animate(Image, EventHandler) Metodo

Definizione

Spazio dei nomi:

System.Drawing

Assembly:

System.Drawing.Common.dll

Pacchetto:

System.Drawing.Common v8.0.0

Origine:

ImageAnimator.cs

Visualizza un'immagine a fotogrammi multipli come un'animazione.

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)

Parametri

image

Image

Oggetto Image da animare.

onFrameChangedHandler

EventHandler

Oggetto EventHandler che specifica il metodo chiamato quando il fotogramma dell'animazione cambia.

Esempio

Questa applicazione Windows Forms illustra come disegnare un'immagine animata sullo schermo. L'immagine viene creata dal file GIF animato SampleAnimation.gif che si trova nella stessa cartella dell'applicazione.

#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

Commenti

Nota

In .NET 6 e versioni successive, il pacchetto System.Drawing.Common, che include questo tipo, è supportato solo nei sistemi operativi Windows. L'uso di questo tipo nelle app multipiattaforma causa avvisi in fase di compilazione ed eccezioni di runtime. Per altre informazioni, vedere System.Drawing.Common supportato solo in Windows.