如何在 C# 中旋转标签？

How do I rotate a label in C#?

提问by Andrew Ducker

I want to show a label rotated 90 degrees (so I can put a bunch of them at the top of a table as the headings). Is there an easy way to do this?

我想显示一个旋转 90 度的标签（因此我可以将一堆标签作为标题放在表格顶部）。是否有捷径可寻？

采纳答案by Bob

You will need to write your own or use a custom control.

您将需要编写自己的控件或使用自定义控件。

A The Code Projectarticle you can start with is Customized Text - Orientated Controls in C# - Part I (Label Control). This contains extra functionality, so you should be able to trim it down if you'd like.

A可以开始的代码项目文章是自定义文本 - C# 中的定向控件 - 第 I 部分（标签控件）。这包含额外的功能，因此您应该可以根据需要对其进行修剪。

And here is some code from it that is of interest:

这里有一些有趣的代码：

/// <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
}

回答by Joshua Drake

You can also take a look at the Windows ToolStrip control. It has an option for TextDirection that can be set to Vertical90 or Vertical270 and this will rotate your Label text in the appropriate direction.

您还可以查看 Windows ToolStrip 控件。它有一个 TextDirection 选项，可以设置为 Vertical90 或 Vertical270，这将在适当的方向旋转你的标签文本。

• Overview: ToolStrip Class(MSDN)

• Setting the property(docs.microsoft.com)

• Enumerated Values(docs.microsoft.com)

• 概述：工具条类(MSDN)

• 设置属性(docs.microsoft.com)

• 枚举值(docs.microsoft.com)