目录

• 实践过程
• 效果
• 代码

实践过程

效果

代码

public partial class GuageRichTextBox : UserControl
{
    public GuageRichTextBox()
    {
        InitializeComponent();
        richTextBox.WordWrap = false;
        richTextBox.Top = Distance_X;
        richTextBox.Left = Distance_Y;
        richTextBox.Width = this.Width - Distance_X - 2;
        richTextBox.Height = this.Height - Distance_Y - 2;
    }


    #region 变量及常量

    const int Distance_X =; //设置RichTextBox控件的X位置
    const int Distance_Y =; //设置RichTextBox控件的Y位置
    const int SpaceBetween =; //设置标尺的间距
    public static float thisleft =; //设置控件的左边距
    public static float StartBitH =; //记录横向滚动条的位置
    public static float StartBitV =; //记录纵向滚动条的位置
    const int Scale = 3; //设置刻度最短的线长
    const int Scale = 6; //设置刻度为5时的线长
    const int Scale = 9; //设置刻度为10是垢线长
    public static float Degree =; //度数
    public static float CodeSize =; //代码编号的宽度

    #endregion

    #region 属性

    [Browsable(true), Category("设置标尺控件"), Description("设置RichTextBox控件的相关属性")] //在“属性”窗口中显示DataStyle属性
    public RichTextBox NRichTextBox
    {
        get { return richTextBox; }
    }

    public enum Ruler
    {
        Graduation =, //刻度
        Rule =, //尺子
    }

    private bool TCodeShow = false;

    [Browsable(true), Category("设置标尺控件"), Description("是否在RichTextBox控件的前面添加代码的行号")] //在“属性”窗口中显示DataStyle属性
    public bool CodeShow
    {
        get { return TCodeShow; }
        set
        {
            TCodeShow = value;
            this.Invalidate();
        }
    }

    private Ruler TRulerStyle = Ruler.Graduation;

    [Browsable(true), Category("设置标尺控件"), Description("设置标尺样式：\nGraduation为刻度\nRule为尺子")] //在“属性”窗口中显示DataStyle属性
    public Ruler RulerStyle
    {
        get { return TRulerStyle; }
        set
        {
            TRulerStyle = value;
            this.Invalidate();
        }
    }

    public enum Unit
    {
        Cm =, //厘米
        Pels =, //像素
    }

    private Unit TUnitStyle = Unit.Cm;

    [Browsable(true), Category("设置标尺控件"), Description("设置标尺的单位：\nCm为厘米\nPels为像素")] //在“属性”窗口中显示DataStyle属性
    public Unit UnitStyle
    {
        get { return TUnitStyle; }
        set
        {
            TUnitStyle = value;
            this.Invalidate();
        }
    }

    #endregion

    #region 事件

    private void GuageRichTextBox_Paint(object sender, PaintEventArgs e)
    {
        e.Graphics.DrawRectangle(new Pen(Color.DarkGray),, 0, this.Width - 1, this.Height - 1); //绘制外边框
        if (CodeShow) //如查在文本框左边添加行号
        {
            //获取行号的宽度
            float tem_code =
                (float) StringSize(
                    (Convert.ToInt(CodeSize + (float) (richTextBox1.Height /
                                                         (StringSize(CodeSize.ToString(), richTextBox.Font,
                                                             false))))).ToString(), this.Font, true);
            richTextBox.Top = Distance_X; //设置控件的顶端距离
            richTextBox.Left = Distance_Y + (int) Math.Ceiling(tem_code); //设置控件的左端距离
            richTextBox.Width = this.Width - Distance_X - 2 - (int) Math.Ceiling(tem_code); //设置控件的宽度
            richTextBox.Height = this.Height - Distance_Y - 2; //设置控件高度
            thisleft = Distance_Y + tem_code; //设置标尺的左端位置
        }
        else
        {
            richTextBox.Top = Distance_X; //设置控件的顶端距离
            richTextBox.Left = Distance_Y; //设置控件的左端距离
            richTextBox.Width = this.Width - Distance_X - 2; //设置控件的宽度
            richTextBox.Height = this.Height - Distance_Y - 2; //设置控件高度
            thisleft = Distance_Y; //设置标尺的左端位置
        }

        //绘制文本框的边框
        e.Graphics.DrawRectangle(new Pen(Color.LightSteelBlue), richTextBox.Location.X - 1, thisleft - 1,
            richTextBox.Width + 1, richTextBox1.Height + 1);
        e.Graphics.FillRectangle(new SolidBrush(Color.Silver),, 1, this.Width - 2, Distance_Y - 2); //文本框的上边框
        e.Graphics.FillRectangle(new SolidBrush(Color.Silver),, 1, Distance_X - 2, this.Height - 2); //文本框的左边框
        e.Graphics.FillRectangle(new SolidBrush(Color.Gray),, 3, Distance_X - 7, Distance_Y - 8); //绘制左上角的方块边框
        e.Graphics.DrawRectangle(new Pen(SystemColors.Control),, 3, Distance_X - 8, Distance_Y - 8); //绘制左上角的方块
        if (RulerStyle == Ruler.Rule) //标尺
        {
            //绘制上边的标尺背景
            e.Graphics.FillRectangle(new SolidBrush(Color.Gray), thisleft -, 3, this.Width - (thisleft - 2),
                Distance_Y -); //绘制左上角的方块边框
            e.Graphics.DrawLine(new Pen(SystemColors.Control), thisleft -, 3, this.Width - 2, 3); //绘制方块的上边线
            e.Graphics.DrawLine(new Pen(SystemColors.Control), thisleft -, Distance_Y - 5, this.Width - 2,
                Distance_Y -); //绘制方块的下边线
            e.Graphics.FillRectangle(new SolidBrush(Color.WhiteSmoke), thisleft -, 9,
                this.Width - (thisleft -) - 1, Distance_Y - 19); //绘制方块的中间块
            //绘制左边的标尺背景
            e.Graphics.FillRectangle(new SolidBrush(Color.Gray),, Distance_Y - 3, Distance_X - 7,
                this.Height - (Distance_Y -) - 2); //绘制左边的方块
            e.Graphics.DrawLine(new Pen(SystemColors.Control),, Distance_Y - 3, 3, this.Height - 2); //绘制方块的左边线
            e.Graphics.DrawLine(new Pen(SystemColors.Control), Distance_X -, Distance_Y - 3, Distance_X - 5,
                this.Height -); //绘制方块的右边线
            e.Graphics.FillRectangle(new SolidBrush(Color.WhiteSmoke),, Distance_Y - 3, Distance_X - 19,
                this.Height - (Distance_Y -) - 2); //绘制方块的中间块
        }

        int tem_temHeight =;
        string tem_value = "";
        int tem_n =;
        int divide =;
        Pen tem_p = new Pen(new SolidBrush(Color.Black));
        //横向刻度的设置
        if (UnitStyle == Unit.Cm) //如果刻度的单位是厘米
            Degree = e.Graphics.DpiX /.4F; //将像素转换成毫米
        if (UnitStyle == Unit.Pels) //如果刻度的单位是像素
            Degree =; //设置10像素为一个刻度
        int tem_width = this.Width -;
        tem_n = (int) StartBitH; //记录横向滚动条的位置
        if (tem_n != StartBitH) //如果横向滚动条的位置值为小数
            StartBitH = (int) StartBitH; //对横向滚动条的位置进行取整
        for (float i =; i < tem_width;) //在文本框的项端绘制标尺
        {
            tem_temHeight = Scale; //设置刻度线的最小长度
            float j = (i + (int) StartBitH) / Degree; //获取刻度值
            tem_value = "";
            j = (int) j; //对刻度值进行取整
            if (j % (divide *) == 0) //如果刻度值是10进位
            {
                tem_temHeight = Scale; //设置最长的刻度线
                if (UnitStyle == Unit.Cm) //如果刻度的单位为厘米
                    tem_value = Convert.ToString(j /); //记录刻度值
                if (UnitStyle == Unit.Pels) //如果刻度的单位为像素
                    tem_value = Convert.ToString((int) j *); //记录刻度值
            }
            else if (j % divide ==) //如果刻度值的进位为5
            {
                tem_temHeight = Scale; //设置刻度线为中等
            }

            tem_p.Width =;
            if (RulerStyle == Ruler.Graduation) //如果是以刻度值进行测量
            {
                //绘制刻度线
                e.Graphics.DrawLine(tem_p, i + + thisleft, SpaceBetween, i + 1 + thisleft,
                    SpaceBetween + tem_temHeight);
                if (tem_value.Length >) //如果有刻度值
                    //绘制刻度值
                    ProtractString(e.Graphics, tem_value.Trim(), i + + thisleft, SpaceBetween, i + 1 + thisleft,
                        SpaceBetween + tem_temHeight,);
            }

            if (RulerStyle == Ruler.Rule) //如果是以标尺进行测量
            {
                if (tem_value.Length >) //如果有刻度值
                {
                    e.Graphics.DrawLine(tem_p, i + + thisleft, 4, i + 1 + thisleft, 7); //绘制顶端的刻度线
                    e.Graphics.DrawLine(tem_p, i + + thisleft, Distance_Y - 9, i + 1 + thisleft,
                        Distance_Y -); //绘制底端的刻度线
                    float tem_space = + (Distance_X - 19F - 9F - StringSize(tem_value.Trim(), this.Font, false)) /
F; //设置文本的横向位置
                    //绘制文本
                    ProtractString(e.Graphics, tem_value.Trim(), i + + thisleft, (float) Math.Ceiling(tem_space),
                        i + + thisleft, (float) Math.Ceiling(tem_space) + tem_temHeight, 0);
                }
            }

            i += Degree; //累加刻度的宽度
        }

        //纵向刻度的设置
        if (UnitStyle == Unit.Cm) //如果刻度的单位是厘米
            Degree = e.Graphics.DpiX /.4F; //将像素转换成毫米
        if (UnitStyle == Unit.Pels) //如果刻度的单位是像素
            Degree =; //刻度值设为10像素
        int tem_height = this.Height -;
        tem_n = (int) StartBitV; //记录纵向滚动条的位置
        if (tem_n != StartBitV) //如果纵向滚动条的位置为小数
            StartBitV = (int) StartBitV; //对其进行取整
        for (float i =; i < tem_height;) //在文本框的左端绘制标尺
        {
            tem_temHeight = Scale; //设置刻度线的最小值
            float j = (i + (int) StartBitV) / Degree; //获取当前的刻度值
            tem_value = "";
            j = (int) j; //对刻度值进行取整
            if (j % == 0) //如果刻度值是10进位
            {
                tem_temHeight = Scale; //设置刻度线的长度为最长
                if (UnitStyle == Unit.Cm) //如果刻度的单位是厘米
                    tem_value = Convert.ToString(j /); //获取厘米的刻度值
                if (UnitStyle == Unit.Pels) //如果刻度的单位是像素
                    tem_value = Convert.ToString((int) j *); //获取像素的刻度值
            }
            else if (j % == 0) //如果刻度值是5进位
            {
                tem_temHeight = Scale; //设置刻度线的长度为中等
            }

            tem_p.Width =;
            if (RulerStyle == Ruler.Graduation) //如果是以刻度值进行测量
            {
                //绘制刻度线
                e.Graphics.DrawLine(tem_p, SpaceBetween, i + + Distance_Y, SpaceBetween + tem_temHeight,
                    i + + Distance_Y);
                if (tem_value.Length >) //如果有刻度值
                    //绘制刻度值
                    ProtractString(e.Graphics, tem_value.Trim(), SpaceBetween, i + + Distance_Y,
                        SpaceBetween + tem_temHeight, i + + Distance_Y, 1);
            }

            if (RulerStyle == Ruler.Rule) //如果是以标尺进行测量
            {
                if (tem_value.Length >) //如果有刻度值
                {
                    e.Graphics.DrawLine(tem_p,, i + 1 + Distance_Y, 7, i + 1 + Distance_Y); //绘制左端刻度线
                    e.Graphics.DrawLine(tem_p, Distance_Y -, i + 1 + Distance_Y, Distance_Y - 7,
                        i + + Distance_Y); //绘制右端刻度线
                    float tem_space = + (Distance_X - 19F - 9F - StringSize(tem_value.Trim(), this.Font, false)) /
F; //设置文本的纵向位置
                    //绘制文本
                    ProtractString(e.Graphics, tem_value.Trim(), (float) Math.Floor(tem_space), i + + Distance_Y,
                        (float) Math.Floor(tem_space) + tem_temHeight, i + + Distance_Y, 1);
                }
            }

            i += Degree; //累加刻度值
        }

        if (CodeShow) //如果显示行号
        {
            //设置文本的高度
            float tem_FontHeight =
                (float) (richTextBox.Height / (StringSize(CodeSize.ToString(), richTextBox1.Font, false)));
            float tem_tep = richTextBox.Top; //获取文本框的顶端位置
            int tem_mark =;
            for (int i =; i < (int) tem_FontHeight; i++) //绘制行号
            {
                tem_mark = i + (int) CodeSize; //设置代码编号的宽度
                //绘制行号
                e.Graphics.DrawString(tem_mark.ToString(), this.Font, new SolidBrush(Color.Red),
                    new PointF(richTextBox.Left - StringSize(tem_mark.ToString(), this.Font, true) - 2, tem_tep));
                tem_tep = tem_tep + StringSize("懂", richTextBox.Font, false); //设置下一个行号的X坐标值
            }
        }
    }

    private void GuageRichTextBox_Resize(object sender, EventArgs e)
    {
        richTextBox.Top = Distance_X; //设置控件的顶端位置
        richTextBox.Left = Distance_Y; //设置控件的左端位置
        richTextBox.Width = this.Width - Distance_X - 2; //设置控件的宽度
        richTextBox.Height = this.Height - Distance_Y - 2; //设置控件的高度
        this.Invalidate();
    }

    private void richTextBox_HScroll(object sender, EventArgs e)
    {
        StartBitH = (int) (Math.Abs((float) richTextBox.GetPositionFromCharIndex(0).X - 1)); //检索控件横向内指定字符索引处的位置
        this.Invalidate();
    }

    private void richTextBox_VScroll(object sender, EventArgs e)
    {
        StartBitV = (int) (Math.Abs((float) richTextBox.GetPositionFromCharIndex(0).Y - 1)); //检索控件纵向内指定字符索引处的位置
        if (CodeShow) //如果显示行号
            CodeSize = (int) Math.Abs((richTextBox.GetPositionFromCharIndex(0).Y /
                                       StringSize("懂", richTextBox.Font, false))); //设置行号的高度
        this.Invalidate();
    }

    #endregion

    #region 方法

    /// <summary>
    /// 在指定的位置绘制文本信息
    /// </summary>
    /// <param e="Graphics">封装一个绘图的类对象</param>
    /// <param str="string">文本信息</param> 
    /// <param x="float">左上角x坐标</param> 
    /// <param y="float">左上角y坐标</param> 
    /// <param x="float">右下角x坐标</param> 
    /// <param y="float">右下角y坐标</param> 
    /// <param n="float">标识,判断是在横向标尺上绘制文字还是在纵向标尺上绘制文字</param> 
    public void ProtractString(Graphics e, string str, float x, float y1, float x2, float y2, float n)
    {
        float TitWidth = StringSize(str, this.Font, true); //获取字符串的宽度
        if (n ==) //在横向标尺上绘制文字
            e.DrawString(str, this.Font, new SolidBrush(Color.Black), new PointF(x - TitWidth / 2, y2 + 1));
        else //在纵向标尺上绘制文字
        {
            StringFormat drawFormat = new StringFormat(); //实例化StringFormat类
            drawFormat.FormatFlags = StringFormatFlags.DirectionVertical; //设置文本为垂直对齐
            //绘制指定的文本
            e.DrawString(str, this.Font, new SolidBrush(Color.Black), new PointF(x + 1, y2 - TitWidth / 2),
                drawFormat);
        }
    }

    /// <summary>
    /// 获取文本的高度或宽度
    /// </summary>
    /// <param str="string">文本信息</param>
    /// <param font="Font">字体样式</param> 
    /// <param n="bool">标识,判断返回的是高度还是宽度</param> 
    public float StringSize(string str, Font font, bool n) //n==true为width
    {
        Graphics TitG = this.CreateGraphics(); //创建Graphics类对象
        SizeF TitSize = TitG.MeasureString(str, font); //将绘制的字符串进行格式化
        float TitWidth = TitSize.Width; //获取字符串的宽度
        float TitHeight = TitSize.Height; //获取字符串的高度
        if (n)
            return TitWidth; //返回文本信息的宽度
        else
            return TitHeight; //返回文本信息的高度
    }

    #endregion
}