exercise 7

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.AutoSize = True : Me.Text = "Graph by Your ID"
        PictureBox1.Top = 0 : PictureBox1.Left = 0
        PictureBox1.Width = 500 : PictureBox1.Height = 500
        Button1.Text = "Draw" : Button1.Font = New Font("Courier", 20)
        Button1.Width = 100 : Button1.Height = 50
        Button1.Top = 10 : Button1.Left = PictureBox1.Width + 50
    End Sub

    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim myGraph As Graphics = PictureBox1.CreateGraphics
        Dim myPen1, myPen2, myPen3 As Pen
        Dim id, ang, bigR, x1, y1, x2, y2 As Single
        myPen1 = New Pen(Color.Blue, 5) : myGraph.DrawRectangle(myPen1, 0, 0, 500, 500)
        myPen2 = New Pen(Color.Gray, 1)
        'myGraph.DrawLine(myPen2, 0, 250, 500, 250)
        'myGraph.DrawLine(myPen2, 250, 0, 250, 5000)
        'myGraph.TranslateTransform(250, 250)
        myPen3 = New Pen(Color.cyan, 6)
        bigR = 400
        For id = 1 To 180
            ang = id * Math.PI / 45
            x1 = 0 : y1 = bigR * Math.Sin(ang)
            x2 = bigR * Math.Cos(ang) : y2 = y1
            myGraph.DrawLine(myPen3, x1, y1, x2, y2)
        Next

    End Sub
End Class