The SetDigitSubstitution method can be used to substitute digits in a string on the basis of a user's local area. SetDigitSubstitution takes a parameter of the SetDigitSubstitution enumeration, the members of which are described in Table 5.12.

TABLE 5.12: StringDigitSubstitute members

Rendering Text with Quality and Performance

Here we will discuss the TextRenderingHint property of the Graphics class.

Note: The TextRenderingHint enumeration is defined in the System.Drawing.Text namespace.

The TextRenderingHint property of the Graphics class defines the quality of text rendered on graphics surfaces. The quality also affects drawing performance. For best performance, select low-quality rendering. Better quality will produce slower rendering. For LCD displays, ClearType text provides the best quality.

The TextRenderingHint property takes a value of type TextRenderingHint enumeration. The members of the TextRenderingHint enumeration are described in Table 5.13.

Listing 5.12 uses the TextRenderingHint property to draw text with different options. The code draws four different text strings using different text rendering hint options.

LISTING 5.12: Using TextRenderingHint to set the quality of text

Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Drawing.Text
Imports System.Linq
Imports System.IO
Imports System.Text
Imports System.Windows.Forms
Public Class Form1

    Private Sub Form1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim redBrush As New SolidBrush(Color.Red)
        Dim verdana16 As New Font("Verdana", 16)
        Dim text1 As String = "Text with SingleBitPerPixel"
        Dim text2 As String = "Text with ClearTypeGridFit"
        Dim text3 As String = "Text with AntiAliasing"
        Dim text4 As String = "Text with SystemDefault"

        'Set TextRenderingHint property of surface
        'to single bit per pixel
        g.TextRenderingHint = TextRenderingHint.SingleBitPerPixel

        'Draw string
        g.DrawString(text1, verdana16, redBrush, New PointF(10, 10))

        'Set TextRenderingHint property of surface to ClearType grid fit
        g.TextRenderingHint = TextRenderingHint.ClearTypeGridFit

        'Draw string
        g.DrawString(text2, verdana16, redBrush, New PointF(10, 60))

        'Set TextRenderingHint property to surface to Antialias
        g.TextRenderingHint = TextRenderingHint.AntiAlias

        'Draw string
        g.DrawString(text3, verdana16, redBrush, New PointF(10, 100))

        'Set TextRenderingHint property of surface to SystemDefault
        g.TextRenderingHint = TextRenderingHint.SystemDefault

        'Draw string
        g.DrawString(text4, verdana16, redBrush, New PointF(10, 150))

        'Dispose of objects
        redBrush.Dispose()
        g.Dispose()
    End Sub
End Class

TABLE 5.12: TextRenderingHint members
 

Figure 5.17 shows the output from Listing 5.12. Different TextRenderingHint options result with higher or lower quality. (How clearly this shows up will vary on different displays-and it may be hard to see in print.)



FIGURE 5.17: Using different TextRenderingHint setting to draw text

Conclusion

Hope the article would have helped you in understanding Setting Digital Substitution in GDI+. Read other articles on GDI+ on the website.