B
Bob Steuernagel
This code is for a simple drawing program that lets the user draw lines,
rectangles, and circles in different colors. When the menu is dropped down
to change objects, it erases anything drawn underneath the menu drop-down
area. What is wrong?
Imports System.Drawing
Public Class Form1
Inherits System.Windows.Forms.Form
Dim drawchoice As Integer
Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MenuItem2.Click
drawchoice = 3
Me.ActiveForm.Show()
End Sub
Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As
System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove
If e.Button = MouseButtons.Left Then
Dim mygc As Graphics = Graphics.FromHwnd(Me.Handle)
Dim mycirPen As New Pen(Color.Red, 4)
Dim myrecPen As New Pen(Color.Green, 3)
Dim mylinePen As New Pen(Color.Blue, 5)
Select Case drawchoice
Case 1
mygc.DrawEllipse(mycirPen, e.X, e.Y, 100, 100)
Case 2
mygc.DrawRectangle(myrecPen, e.X, e.Y, 50, 50)
Case 3
mygc.DrawLine(mylinePen, e.X, e.Y, e.X + 50, e.Y + 50)
End Select
End If
End Sub
Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MenuItem3.Click
drawchoice = 1
Me.ActiveForm.Show()
End Sub
Private Sub MenuItem4_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MenuItem4.Click
drawchoice = 2
Me.ActiveForm.Show()
End Sub
Private Sub MenuItem5_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MenuItem5.Click
Me.Close()
End
End Sub
rectangles, and circles in different colors. When the menu is dropped down
to change objects, it erases anything drawn underneath the menu drop-down
area. What is wrong?
Imports System.Drawing
Public Class Form1
Inherits System.Windows.Forms.Form
Dim drawchoice As Integer
Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MenuItem2.Click
drawchoice = 3
Me.ActiveForm.Show()
End Sub
Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As
System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove
If e.Button = MouseButtons.Left Then
Dim mygc As Graphics = Graphics.FromHwnd(Me.Handle)
Dim mycirPen As New Pen(Color.Red, 4)
Dim myrecPen As New Pen(Color.Green, 3)
Dim mylinePen As New Pen(Color.Blue, 5)
Select Case drawchoice
Case 1
mygc.DrawEllipse(mycirPen, e.X, e.Y, 100, 100)
Case 2
mygc.DrawRectangle(myrecPen, e.X, e.Y, 50, 50)
Case 3
mygc.DrawLine(mylinePen, e.X, e.Y, e.X + 50, e.Y + 50)
End Select
End If
End Sub
Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MenuItem3.Click
drawchoice = 1
Me.ActiveForm.Show()
End Sub
Private Sub MenuItem4_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MenuItem4.Click
drawchoice = 2
Me.ActiveForm.Show()
End Sub
Private Sub MenuItem5_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MenuItem5.Click
Me.Close()
End
End Sub