如何在C＃中旋转标签？

Question

我想显示一个旋转90度的标签（所以我可以把它们放在表格的顶部作为标题）。是否有捷径可寻？

Answer 1

您将需要编写自己的或使用自定义控件。

A The Code Project您可以从Customized Text - Orientated Controls in C# - Part I (Label Control)开始的文章。这包含额外的功能，所以你应该能够修剪它，如果你愿意。

这里是从它的一些代码，感兴趣：

/// <summary> 
/// This is a lable, in which you can set the text in any direction/angle 
/// </summary> 

#region Orientation 

//Orientation of the text 

public enum Orientation 
{ 
    Circle, 
    Arc, 
    Rotate 
} 

public enum Direction 
{ 
    Clockwise, 
    AntiClockwise 
} 

#endregion 

public class OrientedTextLabel : System.Windows.Forms.Label 
{ 
    #region Variables 

    private double rotationAngle; 
    private string text; 
    private Orientation textOrientation; 
    private Direction textDirection; 

    #endregion 

    #region Constructor 

    public OrientedTextLabel() 
    { 
     //Setting the initial condition. 
     rotationAngle = 0d; 
     textOrientation = Orientation.Rotate; 
     this.Size = new Size(105,12); 
    } 

    #endregion 

    #region Properties 

    [Description("Rotation Angle"),Category("Appearance")] 
    public double RotationAngle 
    { 
     get 
     { 
      return rotationAngle; 
     } 
     set 
     { 
      rotationAngle = value; 
      this.Invalidate(); 
     } 
    } 

    [Description("Kind of Text Orientation"),Category("Appearance")] 
    public Orientation TextOrientation 
    { 
     get 
     { 
      return textOrientation; 
     } 
     set 
     { 
      textOrientation = value; 
      this.Invalidate(); 
     } 
    } 

    [Description("Direction of the Text"),Category("Appearance")] 
    public Direction TextDirection 
    { 
     get 
     { 
      return textDirection; 
     } 
     set 
     { 
      textDirection = value; 
      this.Invalidate(); 
     } 
    } 

    [Description("Display Text"),Category("Appearance")] 
    public override string Text 
    { 
     get 
     { 
      return text; 
     } 
     set 
     { 
      text = value; 
      this.Invalidate(); 
     } 
    } 

    #endregion 

    #region Method 

    protected override void OnPaint(PaintEventArgs e) 
    { 
     Graphics graphics = e.Graphics; 

     StringFormat stringFormat = new StringFormat(); 
     stringFormat.Alignment = StringAlignment.Center; 
     stringFormat.Trimming = StringTrimming.None; 

     Brush textBrush = new SolidBrush(this.ForeColor); 

     //Getting the width and height of the text, which we are going to write 
     float width = graphics.MeasureString(text,this.Font).Width; 
     float height = graphics.MeasureString(text,this.Font).Height; 

     //The radius is set to 0.9 of the width or height, b'cos not to 
     //hide and part of the text at any stage 
     float radius = 0f; 
     if (ClientRectangle.Width<ClientRectangle.Height) 
     { 
      radius = ClientRectangle.Width *0.9f/2; 
     } 
     else 
     { 
      radius = ClientRectangle.Height *0.9f/2; 
     } 

     //Setting the text according to the selection 
     switch (textOrientation) 
     { 
      case Orientation.Arc: 
      { 
       //Arc angle must be get from the length of the text. 
       float arcAngle = (2*width/radius)/text.Length; 
       if(textDirection == Direction.Clockwise) 
       { 
        for (int i=0; i<text.Length; i++) 
        { 
         graphics.TranslateTransform(
          (float)(radius*(1 - Math.Cos(arcAngle*i + rotationAngle/180 * Math.PI))), 
          (float)(radius*(1 - Math.Sin(arcAngle*i + rotationAngle/180*Math.PI)))); 
         graphics.RotateTransform((-90 + (float)rotationAngle + 180*arcAngle*i/(float)Math.PI)); 
         graphics.DrawString(text[i].ToString(), this.Font, textBrush, 0, 0); 
         graphics.ResetTransform(); 
        } 
       } 
       else 
       { 
        for (int i=0; i<text.Length; i++) 
        { 
         graphics.TranslateTransform(
          (float)(radius*(1 - Math.Cos(arcAngle*i + rotationAngle/180*Math.PI))), 
          (float)(radius*(1 + Math.Sin(arcAngle*i + rotationAngle/180*Math.PI)))); 
         graphics.RotateTransform((-90 - (float)rotationAngle - 180*arcAngle*i/(float)Math.PI)); 
         graphics.DrawString(text[i].ToString(), this.Font, textBrush, 0, 0); 
         graphics.ResetTransform(); 
        } 
       } 
       break; 
      } 
      case Orientation.Circle: 
      { 
       if (textDirection == Direction.Clockwise) 
       { 
        for(int i=0;i<text.Length;i++) 
        { 
         graphics.TranslateTransform(
          (float)(radius*(1 - Math.Cos((2*Math.PI/text.Length)*i + rotationAngle/180*Math.PI))), 
          (float)(radius*(1 - Math.Sin((2*Math.PI/text.Length)*i + rotationAngle/180*Math.PI)))); 
         graphics.RotateTransform(-90 + (float)rotationAngle + (360/text.Length)*i); 
         graphics.DrawString(text[i].ToString(), this.Font, textBrush, 0, 0); 
         graphics.ResetTransform(); 
        } 
       } 
       else 
       { 
        for(int i=0;i<text.Length;i++) 
        { 
         graphics.TranslateTransform(
          (float)(radius*(1 - Math.Cos((2*Math.PI/text.Length)*i + rotationAngle/180*Math.PI))), 
          (float)(radius*(1 + Math.Sin((2*Math.PI/text.Length)*i + rotationAngle/180*Math.PI)))); 
         graphics.RotateTransform(-90 - (float)rotationAngle - (360/text.Length)*i); 
         graphics.DrawString(text[i].ToString(), this.Font, textBrush, 0, 0); 
         graphics.ResetTransform(); 
        } 

       } 
       break; 
      } 

      case Orientation.Rotate: 
      { 
       //For rotation, who about rotation? 
       double angle = (rotationAngle/180)*Math.PI; 
       graphics.TranslateTransform(
        (ClientRectangle.Width+(float)(height*Math.Sin(angle))-(float)(width*Math.Cos(angle)))/2, 
        (ClientRectangle.Height-(float)(height*Math.Cos(angle))-(float)(width*Math.Sin(angle)))/2); 
       graphics.RotateTransform((float)rotationAngle); 
       graphics.DrawString(text,this.Font,textBrush,0,0); 
       graphics.ResetTransform(); 

       break; 
      } 
     } 
    } 
    #endregion 
} 

Answer 2

您还可以看看Windows的ToolStrip控件。它有一个TextDirection选项，可以将其设置为Vertical90或Vertical270，这将使您的标签文本以适当的方向旋转。

• 概述：ToolStrip Class（MSDN）

• 短视频的使用：http://msdn.microsoft.com/en-us/vstudio/bb798042对于旋转看到3:05旋转特别。