2011-10-20 156 views
3

使用System.Drawing.Font,有沒有辦法改變字母間距,就像你可以改變字體大小一樣?System.Drawing.Font - 更改字母間距?

我正在尋找增加字母間距以適應特定寬度。

如果這是不可能的,是否有其他方法可以獲得理想的效果?例如,是否有一個簡單的方法讓多個圖形適合我的特定寬度?

+0

你在哪裏使用這個字體?什麼是利用它? – musefan

+0

它用在GDI +圖像中,用'Graphics.DrawString()' – Curt

+0

'System.Drawing'中沒有內置的機制來繪製調整後的字母間距的文本。你將不得不爲自己的代碼推出自己的代碼。首先查看'MeasureCharacterRanges'。 –

回答

4

我不認爲的DrawString將允許您詳細,字符間距指定什麼,但我會創建一個計算基於所需的寬度間隔,然後繪製每個字符,以適應一個輔助功能。

試試這個,看你怎麼得到?

public void DrawSpacedText(Graphics g, Font font, Brush brush, PointF point, string text, int desiredWidth) 
    { 
     //Calculate spacing 
     float widthNeeded = 0; 
     foreach (char c in text) 
     { 
      widthNeeded += g.MeasureString(c.ToString(), font).Width; 
     } 
     float spacing = (desiredWidth - widthNeeded)/(text.Length - 1); 

     //draw text 
     float indent = 0; 
     foreach (char c in text) 
     { 
      g.DrawString(c.ToString(), font, brush, new PointF(point.X + indent, point.Y)); 
      indent += g.MeasureString(c.ToString(), font).Width + spacing; 
     } 
    } 

你也許可以優化此僅做一個調用每個字符MeasureString。甚至使用MeasureCharacterRanges獲取數組(我認爲更準確反正)

編輯:下面是一個使用MeasureCharacterRanges而不是一個例子...

public void DrawSpacedText(Graphics g, Font font, Brush brush, PointF point, string text, int desiredWidth) 
    { 
     //Calculate spacing 
     float widthNeeded = 0; 
     Region[] regions = g.MeasureCharacterRanges(text, font, new RectangleF(point, new SizeF(desiredWidth, font.Height + 10)), StringFormat.GenericDefault); 
     float[] widths = new float[regions.Length]; 
     for(int i = 0; i < widths.Length; i++) 
     { 
      widths[i] = regions[i].GetBounds(g).Width; 
      widthNeeded += widths[i]; 
     } 
     float spacing = (desiredWidth - widthNeeded)/(text.Length - 1); 

     //draw text 
     float indent = 0; 
     int index = 0; 
     foreach (char c in text) 
     { 
      g.DrawString(c.ToString(), font, brush, new PointF(point.X + indent, point.Y)); 
      indent += widths[index] + spacing; 
      index++; 
     } 
    } 
+2

+1這是一個很好的方法。然而,不斷的間距會導致[文字字跡](http://en.wikipedia.org/wiki/Kerning),這很難實現。換句話說,引用維基百科的結果不會像視覺效果那樣令人滿意。 – Groo

+0

假設一個字符=== glyph,這是有點幼稚的方法。沒有比迪,沒有連字等。只是ASCII表格的下半部分。 – olegz

0

此代碼支持新線在文本並返回一個Image對象。

public static Image ConvertTextToImage(String text, Font font, Color textColor, int spacing = 0) 
{ 
    var textParts = SplitOnBreakLines(text); 
    // dummy image, just create drawing 
    var img = new Bitmap(1, 1); 
    var drawing = Graphics.FromImage(img); 
    // calculate width, height 
    var width = 0.0F; 
    foreach (char c in text) 
    { 
     width += drawing.MeasureString(c.ToString(), font).Width; 
    }   
    width = (width + spacing * (ClearBreakLines(text).Length - 1))/textParts.Length; 
    if (width <= 0) 
     width = 1; 
    var height = font.Height * textParts.Length; 
    // clear and create new objects 
    img.Dispose(); 
    drawing.Dispose(); 

    img = new Bitmap((int)width, (int)height); 
    drawing = Graphics.FromImage(img); 

    //Adjust for high quality 
    drawing.CompositingQuality = CompositingQuality.HighQuality; 
    drawing.InterpolationMode = InterpolationMode.HighQualityBilinear; 
    drawing.PixelOffsetMode = PixelOffsetMode.HighQuality; 
    drawing.SmoothingMode = SmoothingMode.HighQuality; 
    drawing.TextRenderingHint = TextRenderingHint.AntiAliasGridFit; 

    //paint the background 
    drawing.Clear(Color.Transparent); 

    //create a brush for the text 
    var textBrush = new SolidBrush(textColor); 
    //write text 
    var indent = 0.0F; 
    var point = new Point();    
    foreach (var textPart in textParts) 
    { 
     foreach (char c in textPart) 
     { 
      drawing.DrawString(c.ToString(), font, textBrush, new PointF(point.X + indent, point.Y)); 
      indent += drawing.MeasureString(c.ToString(), font).Width + spacing; 
     } 
     indent = 0.0F; 
     point.Y += font.Height; 
    } 
    drawing.Save(); 
    textBrush.Dispose(); 
    drawing.Dispose(); 
    return img;   
} 

public static string ClearBreakLines(string s) 
{ 
    return Regex.Replace(s, @"\r\n?|\n", string.Empty); 
} 

public static string[] SplitOnBreakLines(string s) 
{ 
    return Regex.Split(s, @"\r\n?|\n");   
}