Exercise 4

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 40602154"
        PictureBox1.Top = 0 : PictureBox1.Left = 0
        PictureBox1.Width = 480 : PictureBox1.Height = 280
        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 System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim myGraph As Graphics = PictureBox1.CreateGraphics
        Dim myPen1, myPen2 As Pen
        Dim mybrush As Brush
        Dim id, a, b, x, y, width As Integer
        myPen1 = New Pen(Color.Red, 5)
        myPen2 = New Pen(Color.Orange, 3)
        mybrush = New SolidBrush(Color.Orange)
        myGraph.DrawRectangle(myPen1, 0, 0, 480, 280)
        b = 20

        For id = 1 To 10
            a = 40
            x = (b * id) + 20
            y = b * (id - 1)
            width = 400 - ((id - 1) * a)

            myGraph.DrawRectangle(myPen2, x, y, width, b)
            myGraph.FillRectangle(mybrush, x, y, width, b)
        Next
    End Sub
End Class