問題描述

我想在保存圖像時使用更小的尺寸.我怎樣才能調整它的大小?我使用此代碼重新繪制圖像:

I want to have smaller size at image saved. How can I resize it? I use this code for redering the image:

Size size = new Size(surface.Width, surface.Height);
surface.Measure(size);
surface.Arrange(new Rect(size));
// Create a render bitmap and push the surface to it
RenderTargetBitmap renderBitmap =
    new RenderTargetBitmap(
        (int)size.Width,
        (int)size.Height, 96d, 96d,
        PixelFormats.Default);
renderBitmap.Render(surface);

BmpBitmapEncoder encoder = new BmpBitmapEncoder();
// push the rendered bitmap to it
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
// save the data to the stream
encoder.Save(outStream);

推薦答案

您的表面"視覺效果是否具有縮放功能?如果沒有，您可以將其包裝在 Viewbox 中，然后以您想要的大小渲染 Viewbox.

Does your "surface" visual have scaling capability? You can wrap it in a Viewbox if not, then render the Viewbox at the size you want.

當您在表面上調用測量和排列時，您應該提供您希望位圖的大小.

When you call Measure and Arrange on the surface, you should provide the size you want the bitmap to be.

要使用 Viewbox，請將您的代碼更改為如下所示:

To use the Viewbox, change your code to something like the following:

Viewbox viewbox = new Viewbox();
Size desiredSize = new Size(surface.Width / 2, surface.Height / 2);

viewbox.Child = surface;
viewbox.Measure(desiredSize);
viewbox.Arrange(new Rect(desiredSize));

RenderTargetBitmap renderBitmap =
    new RenderTargetBitmap(
    (int)desiredSize.Width,
    (int)desiredSize.Height, 96d, 96d,
    PixelFormats.Default);
renderBitmap.Render(viewbox);

這篇關于調整位圖圖像的大小的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！