c# - 如何为格式化文本垂直文本对齐？

Question

是否可以在 c# 中将垂直文本对齐设置为格式化文本，例如我的格式化文本是

 var formattedtext=new FormattedText("some string", CultureInfo.CurrentCulture, System.Windows.FlowDirection.LeftToRight, this.GetTypeface(), 12.0, Brushes.Black);

我需要将垂直对齐中心的格式化文本与特定的矩形区域对齐。

Answer 1

这是您如何实现这一目标的方法。如果文本超出限制，我的方法也会缩小以适应边界框。

    /// <summary>
    /// Use to draw some text using font file location.
    /// </summary>
    /// <param name="font">Font file location</param>
    /// <param name="someText"></param>
    /// <param name="fontSize"></param>
    /// <param name="width">bitmap width</param>
    /// <param name="height">bitmap height</param>
    /// <returns>new instance of RenderTargetBitmap</returns>
    private static RenderTargetBitmap DrawText(string font, string someText, int fontSize, int width = 700, int height = 300)
    {
        var name = Path.GetFileName(font);
        var glyphTypeface = new GlyphTypeface(new Uri(font));
        string family = String.Join(" ", glyphTypeface.FamilyNames.Values.ToArray<string>());
        var style = glyphTypeface.Style;
        var weight = glyphTypeface.Weight;
        var fontStretch = glyphTypeface.Stretch;
        string fontUri = new Uri(font.Replace(name, ""), UriKind.RelativeOrAbsolute).AbsoluteUri + "/#" + family;
        var fontFamily = new FontFamily(fontUri);

        var typeface = new Typeface(fontFamily, style, weight, fontStretch);
        var formattedText = new FormattedText(someText, System.Globalization.CultureInfo.InvariantCulture,
            FlowDirection.LeftToRight,
            typeface, fontSize, 
            Brushes.Black);

        formattedText.TextAlignment = TextAlignment.Center;

        var drawingVisual = new DrawingVisual();

        RenderOptions.SetBitmapScalingMode(drawingVisual, BitmapScalingMode.HighQuality);
        RenderOptions.SetEdgeMode(drawingVisual, EdgeMode.Aliased);
        TextOptions.SetTextRenderingMode(drawingVisual, TextRenderingMode.Aliased);

        using (var drawingContext = drawingVisual.RenderOpen())
        {
            drawingContext.DrawRectangle(Brushes.White, null, new Rect(0, 0, width, height));

            var geometry = formattedText.BuildGeometry(new Point(0, 0));

            var bounds = geometry.Bounds;

            var sW = width / bounds.Width;
            var sH = height / bounds.Height;
            var ratio = sH <= sW ? sH : sW;

            if (ratio > 1) ratio = 1;

            var translateX = (width - bounds.Width * ratio) / 2;
            var translateY = (height - bounds.Height * ratio) / 2;
            var transformGroup = new TransformGroup();
            transformGroup.Children.Add(new ScaleTransform(ratio, ratio));
            transformGroup.Children.Add(new TranslateTransform(-bounds.X * ratio + translateX, -bounds.Y * ratio + translateY));

            geometry.Transform = transformGroup;

            drawingContext.DrawGeometry(Brushes.Black, null, geometry);
        }

        var renderTargetBitmap = new RenderTargetBitmap(
            width, height,
            0, 0,
            PixelFormats.Pbgra32);

        renderTargetBitmap.Render(drawingVisual);

        return renderTargetBitmap;
    }

用法：

        //Setting System.Windows.Control.Image source
        image.Source = DrawText(@"C:\Windows\Fonts\ariali.ttf", "Lorem ipsum dolor sit amet,\nconsectetur adipisicing elit,\nsed do eiusmod tempor", 50);

Answer 2

你可以尝试这样的事情：

// e is the PaintEventArgs, which is passed as a parameter

// construct a new Rectangle .
Rectangle  displayRectangle = 
    new Rectangle (new Point(40, 40), new Size (80, 80));

// construct new StringFormat object
var format = new StringFormat(StringFormatFlags.DirectionVertical);

// set the LineAlignment and Alignment properties for 
format.LineAlignment = StringAlignment.Near;
format.Alignment = StringAlignment.Center;

// draw the bounding rectangle and a string for the StringFormat object.
e.Graphics.DrawRectangle(Pens.Black, displayRectangle);
e.Graphics.DrawString("Showing Format", this.Font, 
    Brushes.Red, (RectangleF)displayRectangle, format);