C#--GDI+绘制多行文本和格式化文本

绘制多行文本需要计算行高，然后绘出字符串：

1 private void Form1_Paint(object sender, PaintEventArgs e)
2 {
3 Graphics g = e.Graphics;
4 g.FillRectangle(Brushes.White,this.ClientRectangle);
5 string s = "This string is long enough to wrap.";
6 s += "With a 200px-width rectangle,and a 12pt font.";
7 s += "it requires six lines to display the stirng in its entirety.";
8
9 Font f = new Font("Arial", 12);
10 Rectangle r = new Rectangle(20, 20, 200, f.Height * 6);
11 g.DrawRectangle(Pens.Black,r);
12 g.DrawString(s, f, Brushes.Black, r);
13
14 f.Dispose();
15 }

绘制竖向文本，需要指定StringFormat类为DirectionVertical，即：StringFormat sf = new StringFormat(StringFormatFlags.DirectionVertical);

然后应用于文字

    SizeF sizef = g.MeasureString(s, f, Int32.MaxValue, sf);

   // Create and draw the rectangle
   // Also draw the text string (using the StringFormat object)
   RectangleF rf = new RectangleF(20, 20, sizef.Width, sizef.Height);

代码如下：

1 private void Form1_Paint(object sender,
2 System.Windows.Forms.PaintEventArgs e)
3 {
4 Graphics g = e.Graphics;
5 g.FillRectangle(Brushes.White, this.ClientRectangle);
6
7 // Create a text string, a Font object, and a StringFormat object
8   String s = "Accrington Stanley";
9 StringFormat sf = new StringFormat(StringFormatFlags.DirectionVertical);
10 Font f = new Font("Times New Roman", 14);
11
12 // Calculate the size of the text string's containing rectangle
13   SizeF sizef = g.MeasureString(s, f, Int32.MaxValue, sf);
14
15 // Create and draw the rectangle
16 // Also draw the text string (using the StringFormat object)
17 RectangleF rf = new RectangleF(20, 20, sizef.Width, sizef.Height);
18 g.DrawRectangle(Pens.Black, rf.Left, rf.Top, rf.Width, rf.Height);
19 g.DrawString(s, f, Brushes.Black, rf, sf);
20
21 f.Dispose();
22 }