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我有以下 .ashx 页面，它接受一些查询字符串参数并返回一个位图，上面写有指定的文本。我遇到的问题是，我目前只是手动将位图的初始大小设置为 100 X 100，而我真正想要的是让位图足够大以包含写入其中的所有文本。我怎样才能做到这一点？

  public void ProcessRequest (HttpContext context) {
    context.Response.ContentType = "image/png";
      string text = context.Request.QueryString["Text"];
    //set FontName
    string fontName;
    if (context.Request.QueryString["FontName"] != null)
    {
        fontName = context.Request.QueryString["FontName"];
    }
    else
    {
        fontName = "Arial";
    }
    //Set FontSize
    int fontEms;
    if (context.Request.QueryString["FontSize"] != null)
    {
        string fontSize = context.Request.QueryString["FontSize"];
        fontEms = Int32.Parse(fontSize);

    }
    else
    {
        fontEms = 12;
    }

    //Set Font Color
    System.Drawing.Color color;
    if (context.Request.QueryString["FontColor"] != null)
    {
        string fontColor = context.Request.QueryString["FontColor"];
        color = System.Drawing.ColorTranslator.FromHtml(fontColor);
        context.Response.Write(color.ToString());
    }
    else
    {
        color = System.Drawing.Color.Red;
    }
    using (System.Drawing.Text.PrivateFontCollection fnts = new System.Drawing.Text.PrivateFontCollection())
    using (System.Drawing.FontFamily fntfam = new System.Drawing.FontFamily(fontName))
    using (System.Drawing.SolidBrush brush = new System.Drawing.SolidBrush(color))
    using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(100, 100))
    {
        using (System.Drawing.Font fnt = new System.Drawing.Font(fntfam, fontEms))
        {
            fnts.AddFontFile(System.IO.Path.Combine(@"C:\Development\Fonts\", fontName));
            System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(bmp);
            graph.DrawString(text, fnt, brush, new System.Drawing.Point(0, 0));
            string imgPath = System.IO.Path.Combine(@"C:\Development\MyPath\Images\Text", System.IO.Path.GetRandomFileName());
            bmp.Save(imgPath);
            context.Response.WriteFile(imgPath);
        }
    }
}

更新： 我最终创建了比我需要的更大的位图，从该位图中获取图形并使用 MeasureString 方法来获取我要编写的文本的大小，然后将位图的那部分裁剪成一个新的位图，例如所以。

 using (System.Drawing.Text.PrivateFontCollection fnts = new System.Drawing.Text.PrivateFontCollection())
    using (System.Drawing.FontFamily fntfam = new System.Drawing.FontFamily(fontName))
    using (System.Drawing.SolidBrush brush = new System.Drawing.SolidBrush(color))
    using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(500, 500))
    {
        using (System.Drawing.Font fnt = new System.Drawing.Font(fntfam, fontEms))
        {
            fnts.AddFontFile(System.IO.Path.Combine(@"C:\Development\Fonts\", fontName));
            System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(bmp);
            System.Drawing.SizeF bmpSize = graph.MeasureString(text, fnt);
            System.Drawing.Rectangle rect = new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), bmpSize.ToSize());
            System.Drawing.Bitmap croppedBmp = bmp.Clone(rect, bmp.PixelFormat);
            graph = System.Drawing.Graphics.FromImage(croppedBmp);
            graph.DrawString(text, fnt, brush, new System.Drawing.Point(0, 0));
            string imgPath = System.IO.Path.Combine(@"C:\Development\MyPath\Images\Text", System.IO.Path.GetRandomFileName());
            croppedBmp.Save(imgPath);
            context.Response.WriteFile(imgPath);
        }
    }
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1 回答 1

2

我猜有一个System.Drawing.Graphics.MeasureString方法将使用指定的字体返回指定文本的大小。

然后，您可以相应地调整图像大小，或相应地调整文本大小，以使它们都适合在一起。

也许关注这个问题和答案会以某种方式指导您，因为问题是关于调整文本大小以使其适合某个区域。您似乎希望做出类似的东西，因此该算法可能会激发您的灵感。

于 2010-05-07T01:26:02.603 回答