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我使用一个库来从这里绘制大纲文本http://www.codeproject.com/Articles/42529/Outline-Text

我为测试编写了一个函数我试图将outlineText图形对象保存为位图图形对象正确绘制在控件上但是当我将它保存为图像时结果图像为空

        Graphics graphic = this .CreateGraphics();
        graphic.SmoothingMode = SmoothingMode.AntiAlias;
        StringFormat fmt = new StringFormat(StringFormat.GenericTypographic);
        Int32 lNum = (Int32)Math.Log((Double)this.TextAlign, 2);
        fmt.LineAlignment = (StringAlignment)(lNum / 4);
        fmt.Alignment = (StringAlignment)(lNum % 4);

        OutlineText m_OutlineText = new OutlineText();            

        m_OutlineText.EnableShadow(true);
        m_OutlineText.SetNullShadow();
        m_OutlineText.Shadow(ShadowColor, ShadowSize, new Point(4, 4));
        FontFamily fontFamily = this.Font.FontFamily;
        float fStartX = 0.0f;
        float fStartY = 0.0f;
        float fDestWidth = 0.0f;
        float fDestHeight = 0.0f;
        m_OutlineText.MeasureString(
            graphic,
            fontFamily,
            this.Font.Style,
            (int)this.Font.Size,
            this.Text,
            new Point(10, 10),
            fmt,
            ref fStartX,
            ref fStartY,
            ref fDestWidth,
            ref fDestHeight);

        LinearGradientBrush gradientBrush = new LinearGradientBrush(new RectangleF(fStartX, fStartY, fDestWidth - (fStartX - 10), fDestHeight - (fStartY - 10)),
           GrediantA, GrediantB, LinearGradientMode.Vertical);
        m_OutlineText.TextOutline(gradientBrush, OutlineColor, OutlineSize);
        if (_myRc == null)
        {
            _myRc = ClientRectangle;
        }
        m_OutlineText.DrawString(graphic, fontFamily, this.Font.Style, (int)this.Font.Size, this.Text, _myRc, fmt);


      _textImage = new Bitmap(this.Width, this.Height, graphic);
      _textImage.Save(@"C:\bmp.jpg");
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1 回答 1

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构造函数：Bitmap(Int32, Int32, Graphics)用指定的大小和指定的 Graphics 对象的分辨率初始化 Bitmap 类的新实例。它应该是空的。将仅使用图形的分辨率。

如果你想在位图上绘制一些东西并保存它，而不是从位图创建图形：

using(Bitmap bitmap = new Bitmap(Width, Height))
using (Graphics graphics = Graphics.FromImage(bitmap))
{
    Rectangle rect = new Rectangle(0, 0, Width, Height);
    graphics.FillRectangle(new SolidBrush(BackColor), rect);
    graphics.DrawString("Hello, World", Font, new SolidBrush(ForeColor), rect);
    bitmap.Save(@"D:\hello_world.bmp");
}

如果要在控件上绘图并将其图像保存到文件，请使用Control.DrawToBitmap方法。

BTW bitmap should have .bmp extension, it's not JPEG image.

于 2012-07-25T06:45:38.480 回答