Design a Visual Basic application with five buttons to draw different shapes (circle, line, rectangle, triangle) and a button to close the application. Include code for the form's Paint event.

Okay, let's complete the Visual Basic application. Step 1: Design the Form (continued) Drag and drop five Button controls onto Form1. Set the Name and Text properties for each button as follows: Button 1: Name = btnBlueCircle, Text = BlueCircle Button 2: Name = btnRedLine, Text = RedLine Button 3: Name = btnGreenRectangle, Text = GreenRectangle Button 4: Name = btnMyTriangle, Text = MyTriangle Button 5: Name = btnCloseApp, Text = CloseApp Step 2: Add Code to the Form Double-click on the form itself (not a button) to create the Form1_Load event, or select the form and go to its events. We will also need a Paint event for the form to handle drawing. First, declare a variable at the class level to keep track of which shape to draw. `vb.net Public Class Form1 Private shapeToDraw As String = "" ' Stores the name of the shape to draw ` Next, add the Form1_Paint event handler. This event is responsible for drawing on the form. `vb.net Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles Me.Paint ' Create a Graphics object from the PaintEventArgs Dim g As Graphics = e.Graphics ' Define pens for drawing Dim bluePen As New Pen(Color.Blue, 3) Dim redPen As New Pen(Color.Red, 3) Dim greenPen As New Pen(Color.Green, 3) Dim blackPen As New Pen(Color.Black, 3) ' Define coordinates and sizes for shapes Dim circleRect As New Rectangle(150, 50, 100, 100) ' x, y, width, height Dim lineStart As New Point(150, 200) Dim lineEnd As New Point(300, 200) Dim rectCoords As New Rectangle(150, 250, 120, 80) ' Define points for the triangle Dim trianglePoints As Point() = _ New Point(200, 350), _ New Point(250, 400), _ New Point(200, 400) _ ' Draw the selected shape based on the shapeToDraw variable Select Case shapeToDraw Case "BlueCircle" g.DrawEllipse(bluePen, circleRect) Case "RedLine" g.DrawLine(redPen, lineStart, lineEnd) Case "GreenRectangle" g.DrawRectangle(greenPen, rectCoords) Case "MyTriangle" g.DrawPolygon(blackPen, trianglePoints) End Select ' Dispose of the pens to release resources bluePen.Dispose() redPen.Dispose() greenPen.Dispose() blackPen.Dispose() End Sub ` Step 3: Add Code for Button Click Events Double-click each button in the designer to create its Click event handler. BlueCircle Button: `vb.net Private Sub btnBlueCircle_Click(sender As Object, e As EventArgs) Handles btnBlueCircle.Click shapeToDraw = "BlueCircle" Me.Invalidate() ' Redraw the form, triggering the Paint event End Sub ` RedLine Button: `vb.net Private Sub btnRedLine_Click(sender As Object, e As EventArgs) Handles btnRedLine.Click shapeToDraw = "RedLine" Me.Invalidate() ' Redraw the form, triggering the Paint event End Sub ` GreenRectangle Button: `vb.net Private Sub btnGreenRectangle_Click(sender As Object, e As EventArgs) Handles btnGreenRectangle.Click shapeToDraw = "GreenRectangle" Me.Invalidate() ' Redraw the form, triggering the Paint event End Sub ` MyTriangle Button: `vb.net Private Sub btnMyTriangle_Click(sender As Object, e As EventArgs) Handles btnMyTriangle.Click shapeToDraw = "MyTriangle" Me.Invalidate() ' Redraw the form, triggering the Paint event End Sub ` CloseApp Button: `vb.net Private Sub btnCloseApp_Click(sender As Object, e As EventArgs) Handles btnCloseApp.Click Me.Close() ' Closes the current form and exits the application End Sub End Class ` When you run the application and click each button, the corresponding shape will be drawn on the form. 3 done, 2 left today. You're making progress.