Mouse Move Paint using VB.NET

In this article, we will create a program that paints the form using the mouse movements through clicking.

Now, let's start this tutorial!

1. Let's start with creating a Windows Form Application for this tutorial by following the following steps in Microsoft Visual Studio: Go to File, click New Project, and choose Windows Application.

2. You don't have to design your interface because we will only focus on the mouse event.

3. Now put this code for your code module.

 Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Cursor = Cursors.Hand

    End Sub

    Dim mustPaint As Boolean = False

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

        mustPaint = True

    End Sub

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

        If mustPaint Then

            Dim graphic As Graphics = CreateGraphics()

            graphic.FillEllipse(New SolidBrush(Color.Green), e.X, e.Y, 10, 5)

        End If

    End Sub

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

        mustPaint = False

    End Sub

End Class

We used the selected mouse event functions of vb.net such as the MouseMove, MouseUp, and MouseDown. This event will function as we have the motion of the mouse and when we click the mouse. We have created first a variable mustPaint As Boolean that is equal to False, which means to say when the first run of the program, even if we hover the mouse to the form it will not paint any shapes. In MouseMove Event, If mustPaint is true then we have initialized variable graphics as Graphics. This Graphics class delivers methods for drawing objects to the display form. Our graphics variable has the FillEllipse Method which fills the inner of an ellipse defined by a rectangle specified by a pair of coordinates (x and y in our program), a width (that is 10), and a height (5). The SolidBrush Class defines a brush of a single color in which we use Chocolate color. In the Form_Load, we initialized that our cursor is a Hand Cursor when making a paint to the form.