円を描画するには? (ID：143168)

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'円のところは、自分で改良出来ますよね？
'comboboxを追加して動かしてみてください。

Dim Bolder As Integer
    Dim Drawflag As Boolean
    Dim X As Integer
    Dim Y As Integer

Dim aX As Integer
    Dim aY As Integer

Dim g As Graphics

Dim DrawMode As Integer

Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown

DrawMode = Val(ComboBox1.Text)
        Drawflag = True '旗を揚げる

X = e.X
        Y = e.Y

aX = e.X
        aY = e.Y

End Sub

Private Sub PictureBox1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove

If Drawflag = True Then
            Bolder = 5 '線の太さ
            Dim myPen As New Pen(Color.Black, Bolder)
            Dim myClear As New Pen(PictureBox1.BackColor, 15)

If DrawMode = 0 Then
                g.DrawLine(myClear, X, Y, e.X, e.Y)

ElseIf DrawMode = 1 Then
                g.DrawLine(myPen, X, Y, e.X, e.Y)

ElseIf DrawMode = 2 Then
                g.DrawEllipse(myPen, X, Y, 30, 30)

End If

X = e.X
            Y = e.Y

End If

End Sub

Private Sub PictureBox1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseUp

If DrawMode = 2 And Drawflag = True Then
            Dim pPen = New Pen(Color.Red, Bolder)

g.DrawEllipse(pPen, CInt((e.X + aX) / 2), CInt((e.Y + aY) / 2), e.X - aX, e.Y - aY)
'g.DrawEllipse(pPen, aX, aY, e.X - aX, e.Y - aY) 'X - aX, Y - aY)

End If

Drawflag = False
    End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ComboBox1.Items.Add("0")
        ComboBox1.Items.Add("1")
        ComboBox1.Items.Add("2")

g = PictureBox1.CreateGraphics

End Sub

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