如何为UWP中的TextBlock缩放动画 [英] How to animate scale of TextBlock in UWP

问题描述

当我使用Storyboard放大TextBlock时，它会在缩放时像素化，并且仅在完整时重新渲染。

When I use Storyboard to zoom in TextBlock it pixelates while zooming and rerenders only on complete.

<DoubleAnimationUsingKeyFrames Storyboard.TargetName="TextBlock" Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.ScaleY)">
      <EasingDoubleKeyFrame KeyTime="0:0:0.5" Value="1.5"/>

是否有一种方法可以在每帧重新渲染TextBlock？

Is there a way the TextBlock is rerendered each frame?

推荐答案

我找到了一个解决方案，尽管它不再与TextBlock有关，但对我来说却有效：

I found a solution though it's not about TextBlock anymore but for me it worked:

    private void CreateText(string text)
    {
        _compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
        CreateDevice();

        _spriteTextVisual = _compositor.CreateSpriteVisual();
        _spriteTextVisual.Size = new Vector2(512, 512);

        _drawingTextSurface = _graphicsDevice.CreateDrawingSurface(new Size(512, 512), DirectXPixelFormat.B8G8R8A8UIntNormalized, DirectXAlphaMode.Premultiplied);

        using (var ds = CanvasComposition.CreateDrawingSession(_drawingTextSurface))
        {
            ds.Clear(Colors.Transparent);
            ds.DrawText(text, new Rect(0, 0, 512, 512), Colors.Black, new CanvasTextFormat
            {
                FontSize = 32,
                FontWeight = FontWeights.Light,
                VerticalAlignment = CanvasVerticalAlignment.Top,
                HorizontalAlignment = CanvasHorizontalAlignment.Center,
                LineSpacing = 32
            });
        }

        _surfaceTextBrush = _compositor.CreateSurfaceBrush(_drawingTextSurface);

        _spriteTextVisual.Brush = _surfaceTextBrush;

        ElementCompositionPreview.SetElementChildVisual(this, _spriteTextVisual);
    }

    private void CreateDevice()
    {
        _device = CanvasDevice.GetSharedDevice();
        _device.DeviceLost += Device_DeviceLost;

        if (_graphicsDevice == null)
        {
            _graphicsDevice = CanvasComposition.CreateCompositionGraphicsDevice(_compositor, _device);
        }
        else
        {
            CanvasComposition.SetCanvasDevice(_graphicsDevice, _device);
        }
    }

    private async void Device_DeviceLost(CanvasDevice sender, object args)
    {
        _device.DeviceLost -= Device_DeviceLost;
        await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, CreateDevice);
    }

只需使此文本具有最大比例尺大小即可。

Just have to make this text of max scale size.

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