C# 中的字体

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C#中本来已经封装了通用字体Font，但是笔者认为这个Font在使用过程中很不方便。

1) Font的很多属性都是只读的，不能通过更改属性的值而对Font进行操作；必须重新初始化Font对象才行。例如：font.Size=12;是不允许的。

2) Font总归是用来写字的，但是C#中的Font类与string类没有什么联系，这给Font的使用带来了一些麻烦。比如我想要知道一个string对象使用了制定字体和字号以后，打印在屏幕上会占有多少像素？或者我要知道一个字体和字号，使得string中的内容显示在屏幕上的长度刚好适合200个像素？

3) Font和string必须的使用另外的函数方法才能显示在屏幕上，这对于经常要打印、显示Text的程序员来说，实在是太繁琐了。

为了使这些问题能够比较简单解决，请看下面的这个类：

using System;using System.Collections.Generic;using System.Drawing;using System.Text;namespace CoolControls{    public class CoolFont    {        Font font;        string text = string.Empty;        #region [ 构造函数 ]        public CoolFont()        {            font = new Font("Arial", 8.25F);        }        public CoolFont(string fontname,Single size)        {            font = new Font(fontname, size);        }        public CoolFont(Font f)        {            font = new Font(f,f.Style);        }        public CoolFont(string fontname, Single size,FontStyle style)        {            font = new Font(fontname, size,style);        }        public CoolFont(Font f, FontStyle style)        {            font = new Font(f, style);        }        public CoolFont(Font f, Single size)        {            Font tf = new Font(f.Name, size);            font = new Font(tf, f.Style);            tf.Dispose();        }        #endregion        #region [ 属性 ]        public string Text        {            get { return text; }            set { text = value; }        }        public Font Font        {            get { return font; }            set { font = value; }        }        public string FontName        {            get { return font.Name; }            set            {                Font tf = new Font(value, font.Size);                font = new Font(tf, font.Style);                tf.Dispose();            }        }        public Single FontSize        {            get { return font.Size; }            set            {                Font tf = new Font(font.Name, value);                font = new Font(tf, font.Style);                tf.Dispose();            }        }        public FontStyle Style        {            get { return font.Style; }            set { font = new Font(font, value); }        }        public int Height        {            get { return font.Height; }        }        public float SizeInPoints        {            get { return font.SizeInPoints; }        }        #endregion        #region [ 公有函数 ]        public void FitWidth(Graphics g, float width)        {            this.FontSize = FitStringWidth(this.Text, this.Font, g, width);        }        public void FitHeight(Graphics g, float height)        {            this.FontSize = FitStringHeight(this.Text, this.Font, g, height);        }        public void FitRect(Graphics g, Rectangle rt)        {            this.FontSize = FitStringRect(this.Text, this.Font, g, rt);        }        public void DrawStringFit(Graphics g, Brush brush, Rectangle rt)        {            DrawStringFit(this, g, brush, rt);        }        public void DrawStringFit(Graphics g, Brush brush, Rectangle rt, StringAlignment alignment, StringAlignment alignmentV)        {            DrawStringFit(this, g, brush, rt,alignment, alignmentV);        }        #endregion        #region [ 静态函数 ]        public static SizeF GetStringSize(string s, Font f,Graphics g)        {            return g.MeasureString(s, f);        }        public static SizeF GetStringSize(CoolFont cf, Graphics g)        {            return g.MeasureString(cf.Text, cf.Font);        }        public static float FitStringWidth(string s, Font f, Graphics g, float width)        {            CoolFont cf = new CoolFont(f, f.Style);            cf.Text = s;                        SizeF sf = GetStringSize(cf, g);            cf.FontSize = Math.Abs(sf.Width - width) / cf.Text.Length;            sf = GetStringSize(cf, g);            if (sf.Width > width)            {                while (sf.Width > width)                {                    cf.FontSize -= 0.1F;                                        sf = GetStringSize(cf, g);                }            }            else if(sf.Width < width)            {                while (sf.Width < width)                {                    cf.FontSize += 0.1F;                    sf = GetStringSize(cf, g);                }                cf.FontSize -= 0.1F;            }            return cf.FontSize;        }        public static float FitStringWidth(CoolFont cf, Graphics g, float width)        {            return FitStringWidth(cf.Text, cf.Font, g, width);        }        public static float FitStringHeight(string s, Font f, Graphics g, float height)        {            CoolFont cf = new CoolFont(f, f.Style);            cf.Text = s;            SizeF sf = GetStringSize(cf, g);            cf.FontSize = Math.Abs(sf.Height - height) / cf.Text.Length;            sf = GetStringSize(cf, g);            if (sf.Height > height)            {                while (sf.Height > height)                {                    cf.FontSize -= 0.1F;                    sf = GetStringSize(cf, g);                }            }            else if (sf.Height < height)            {                while (sf.Height < height)                {                    cf.FontSize += 0.1F;                    sf = GetStringSize(cf, g);                }                cf.FontSize -= 0.1F;            }            return cf.FontSize;        }        public static float FitStringHeight(CoolFont cf, Graphics g, float height)        {            return FitStringHeight(cf.Text, cf.Font, g, height);        }        public static float FitStringRect(string s, Font f, Graphics g, Rectangle rt)        {            CoolFont cf = new CoolFont(f, f.Style);            cf.Text = s;            SizeF sf = GetStringSize(cf, g);            cf.FontSize = (sf.Width - rt.Width) / cf.Text.Length;            sf = GetStringSize(cf, g);            if (sf.Width > rt.Width)            {                while (sf.Width > rt.Width)                {                    cf.FontSize -= 0.1F;                    sf = GetStringSize(cf, g);                }            }            else if (sf.Width < rt.Width)            {                while (sf.Width < rt.Width)                {                    cf.FontSize += 0.1F;                    sf = GetStringSize(cf, g);                }                cf.FontSize -= 0.1F;            }            if (sf.Height > rt.Height)            {                while (sf.Height > rt.Height)                {                    cf.FontSize -= 0.1F;                    sf = GetStringSize(cf, g);                }            }            return cf.FontSize;        }        public static float FitStringRect(CoolFont cf, Graphics g, Rectangle rt)        {            return FitStringRect(cf.Text, cf.Font, g, rt);        }        public static void DrawStringFit(string s, Font f, Graphics g, Brush brush, Rectangle rt)        {            CoolFont cf = new CoolFont(f, f.Style);            cf.Text = s;            SizeF sf = GetStringSize(cf, g);            cf.FontSize = Math.Abs(sf.Width - rt.Width) / cf.Text.Length;            sf = GetStringSize(cf, g);            if (sf.Width > rt.Width)            {                while (sf.Width > rt.Width)                {                    cf.FontSize -= 0.1F;                    sf = GetStringSize(cf, g);                }            }            else if (sf.Width < rt.Width)            {                while (sf.Width < rt.Width)                {                    cf.FontSize += 0.1F;                    sf = GetStringSize(cf, g);                }                cf.FontSize -= 0.1F;            }                        if (sf.Height > rt.Height)            {                while (sf.Height > rt.Height)                {                    cf.FontSize -= 0.1F;                    sf = GetStringSize(cf, g);                }            }                                   StringFormat format = new StringFormat();            format.FormatFlags = StringFormatFlags.NoClip;            format.Alignment = StringAlignment.Center;            format.LineAlignment = StringAlignment.Center;            g.DrawString(cf.Text, cf.Font, brush, rt, format);        }        public static void DrawStringFit(CoolFont cf, Graphics g, Brush brush, Rectangle rt)        {            DrawStringFit(cf.Text, cf.Font,g, brush, rt);        }        public static void DrawStringFit(string s, Font f, Graphics g, Brush brush, Rectangle rt, StringAlignment alignment, StringAlignment alignmentV)        {            CoolFont cf = new CoolFont(f, f.Style);            cf.Text = s;            SizeF sf = GetStringSize(cf, g);            cf.FontSize = Math.Abs(sf.Width - rt.Width) / cf.Text.Length;            sf = GetStringSize(cf, g);            if (sf.Width > rt.Width)            {                while (sf.Width > rt.Width)                {                    cf.FontSize -= 0.1F;                    sf = GetStringSize(cf, g);                }            }            else if (sf.Width < rt.Width)            {                while (sf.Width < rt.Width)                {                    cf.FontSize += 0.1F;                    sf = GetStringSize(cf, g);                }                cf.FontSize -= 0.1F;            }            if (sf.Height > rt.Height)            {                while (sf.Height > rt.Height)                {                    cf.FontSize -= 0.1F;                    sf = GetStringSize(cf, g);                }            }            StringFormat format = new StringFormat();            format.FormatFlags = StringFormatFlags.NoClip;            format.Alignment = alignment;            format.LineAlignment = alignmentV;            g.DrawString(cf.Text, cf.Font, brush, rt, format);        }        public static void DrawStringFit(CoolFont cf, Graphics g, Brush brush, Rectangle rt, StringAlignment alignment, StringAlignment alignmentV)        {            DrawStringFit(cf.Text, cf.Font, g, brush, rt, alignment,alignmentV);        }        #endregion    }}

这个类允许静态或者动态访问，并且实现了string，Font和Drawing的联合，使得字符串的打印、显示操作变得很容易。

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