Viết chương trình MS paint đơn giản.

Hôm nay, mình xin hướng dẫn các bạn viết một chương trình ms paint đơn giản, ở đây ta cần 1 picturebox, (panel để vẽ hình lên) và các button dùng để thay đổi màu sắc, 

- Ở đây chúng ta dùng sự kiện mouse move để vẽ là chính.

Code tham khảo ở dưới đây:

Dim down = False
    Dim mybrush = Brushes.Black
    Private Sub PictureBox1_MouseDown(sender As Object, e As MouseEventArgs) Handles PictureBox1.MouseDown
        down = True
    End Sub

    Private Sub PictureBox1_MouseMove(sender As Object, e As MouseEventArgs) Handles PictureBox1.MouseMove
        If down = True Then
            PictureBox1.CreateGraphics.FillEllipse(mybrush, e.X, e.Y, 15, 15)
        End If
    End Sub

    Private Sub PictureBox1_MouseUp(sender As Object, e As MouseEventArgs) Handles PictureBox1.MouseUp
        down = False
    End Sub

    Private Sub Button1_Click_1(sender As Object, e As EventArgs) Handles Button1.Click
        mybrush = Brushes.Yellow
    End Sub

    Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click
        mybrush = Brushes.Red
    End Sub

    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
        mybrush = Brushes.Blue
    End Sub

    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
        mybrush = Brushes.Green
    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        mybrush = Brushes.Purple
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        mybrush = Brushes.Pink

    End Sub

    Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Button8.Click
        mybrush = Brushes.Brown
    End Sub

    Private Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.Click
        mybrush = Brushes.Orange
    End Sub

    Private Sub Button9_Click(sender As Object, e As EventArgs) Handles Button9.Click
        mybrush = Brushes.Black
    End Sub

Chúc các bạn thành công!