VB.NET Graphics.FillEllipse方法代碼示例

Public Sub FillEllipseInt(ByVal e As PaintEventArgs)

    ' Create solid brush.
    Dim redBrush As New SolidBrush(Color.Red)

    ' Create location and size of ellipse.
    Dim x As Integer = 0
    Dim y As Integer = 0
    Dim width As Integer = 200
    Dim height As Integer = 100

    ' Fill ellipse on screen.
    e.Graphics.FillEllipse(redBrush, x, y, width, height)
End Sub

Public Sub FillEllipseFloat(ByVal e As PaintEventArgs)

    ' Create solid brush.
    Dim redBrush As New SolidBrush(Color.Red)

    ' Create location and size of ellipse.
    Dim x As Single = 0.0F
    Dim y As Single = 0.0F
    Dim width As Single = 200.0F
    Dim height As Single = 100.0F

    ' Fill ellipse on screen.
    e.Graphics.FillEllipse(redBrush, x, y, width, height)
End Sub

Public Sub FillEllipseRectangle(ByVal e As PaintEventArgs)

    ' Create solid brush.
    Dim redBrush As New SolidBrush(Color.Red)

    ' Create rectangle for ellipse.
    Dim x As Integer = 0
    Dim y As Integer = 0
    Dim width As Integer = 200
    Dim height As Integer = 100
    Dim rect As New Rectangle(x, y, width, height)

    ' Fill ellipse on screen.
    e.Graphics.FillEllipse(redBrush, rect)
End Sub

Public Sub FillEllipseRectangleF(ByVal e As PaintEventArgs)

    ' Create solid brush.
    Dim redBrush As New SolidBrush(Color.Red)

    ' Create rectangle for ellipse.
    Dim x As Single = 0.0F
    Dim y As Single = 0.0F
    Dim width As Single = 200.0F
    Dim height As Single = 100.0F
    Dim rect As New RectangleF(x, y, width, height)

    ' Fill ellipse on screen.
    e.Graphics.FillEllipse(redBrush, rect)
End Sub

' 導入命名空間
Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports System.Drawing.Text

Public Class MainClass

   Shared Sub Main()
        Dim myform As Form = New FrmDrawing()
        Application.Run(myform)
   End Sub ' Main

End Class



Public Class FrmDrawing
   Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

   Public Sub New()
      MyBase.New()

      'This call is required by the Windows Form Designer.
      InitializeComponent()

      'Add any initialization after the InitializeComponent() call

   End Sub

   'Form overrides dispose to clean up the component list.
   Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
      If disposing Then
         If Not (components Is Nothing) Then
            components.Dispose()
         End If
      End If
      MyBase.Dispose(disposing)
   End Sub

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

   '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()
      '
      'frmDrawing
      '
      Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
      Me.BackColor = System.Drawing.SystemColors.AppWorkspace
      Me.ClientSize = New System.Drawing.Size(472, 157)
      Me.Name = "frmDrawing"
      Me.Text = "Drawing lines, rectangles and ovals"

   End Sub

#End Region

   ' display ovals lines, and rectangles
   Protected Overrides Sub OnPaint( _
      ByVal paintEvent As PaintEventArgs)

      ' get graphics object
      Dim g As Graphics = paintEvent.Graphics
      Dim brush As SolidBrush = New SolidBrush(Color.Blue)
      Dim pen As Pen = New Pen(Color.AliceBlue)

      ' set brush to red
      brush.Color = Color.Red

      ' draw base Ellipse
      g.FillEllipse(brush, 280, 75, 100, 50)

      ' draw connecting lines
      g.DrawLine(pen, 380, 55, 380, 100)
      g.DrawLine(pen, 280, 55, 280, 100)

      ' draw Ellipse outline
      g.DrawEllipse(pen, 280, 30, 100, 50)

   End Sub ' OnPaint

End Class