CellAscent, Descent, EmHeight, LineSpacing : Font « 2D Graphics « VB.Net Tutorial






CellAscent, Descent, EmHeight, LineSpacing
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms

public class MeasureString
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

Public Class Form1
    Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
        Dim textArea As SizeF
        Dim linePen As Pen
        Dim largeFont As Font
        Dim fontRatio As Single
        Dim ascentSize As Single
        Dim descentSize As Single
        Dim emSize As Single
        Dim cellHeight As Single
        Dim internalLeading As Single
        Dim externalLeading As Single

        e.Graphics.TextRenderingHint = Drawing.Text.TextRenderingHint.AntiAlias
        largeFont = New Font("Times New Roman", 96, FontStyle.Regular)

        fontRatio = largeFont.Height / largeFont.FontFamily.GetLineSpacing(FontStyle.Regular)

        textArea = e.Graphics.MeasureString("AbcJgp", largeFont)

        e.Graphics.DrawString("AbcJgp", largeFont, Brushes.Black, 0, 0)

        linePen = New Pen(Color.Gray, 1)
        linePen.DashStyle = Drawing2D.DashStyle.Dash

        ascentSize = largeFont.FontFamily.GetCellAscent(FontStyle.Regular) * fontRatio
        descentSize = largeFont.FontFamily.GetCellDescent(FontStyle.Regular) * fontRatio
        emSize = largeFont.FontFamily.GetEmHeight(FontStyle.Regular) * fontRatio
        cellHeight = ascentSize + descentSize
        internalLeading = cellHeight - emSize
        externalLeading = (largeFont.FontFamily.GetLineSpacing(FontStyle.Regular) * fontRatio) - cellHeight

        e.Graphics.DrawLine(linePen, 0, 0, textArea.Width, 0)
        e.Graphics.DrawLine(linePen, 0, textArea.Height, textArea.Width, textArea.Height)

        e.Graphics.DrawLine(linePen, 0, ascentSize, textArea.Width, ascentSize)
        e.Graphics.DrawLine(linePen, 0, ascentSize + descentSize, textArea.Width, ascentSize + descentSize)

        linePen.Dispose()
        largeFont.Dispose()
        e.Graphics.ResetTransform()
    End Sub
End Class


<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        CType(Me.PictureBox1, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'PictureBox1
        '
        Me.PictureBox1.BackColor = System.Drawing.Color.White
        Me.PictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.PictureBox1.Location = New System.Drawing.Point(8, 8)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(550, 224)
        Me.PictureBox1.TabIndex = 0
        Me.PictureBox1.TabStop = False
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(600, 242)
        Me.Controls.Add(Me.PictureBox1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.MaximizeBox = False
        Me.Name = "Form1"
        Me.Text = "Measuring Text"
        CType(Me.PictureBox1, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox

End Class








17.36.Font
17.36.1.Create Font with font name, size and styleCreate Font with font name, size and style
17.36.2.Create Font from FontCreate Font from Font
17.36.3.Set font name, size and styleSet font name, size and style
17.36.4.Font Size
17.36.5.Get Font informationGet Font information
17.36.6.Displaying font metric informationDisplaying font metric information
17.36.7.Use CheckBox to Set FontUse CheckBox to Set Font
17.36.8.Font 3DFont 3D
17.36.9.CellAscent, Descent, EmHeight, LineSpacingCellAscent, Descent, EmHeight, LineSpacing
17.36.10.Use RadioButton to control fontUse RadioButton to control font
17.36.11.Use CheckBox to control fontUse CheckBox to control font