VB.Net Tutorial/2D Graphics/Mouse Draw
Mouse drag and draw
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class MouseDrawLine
public Shared Sub Main Application.Run(New Form1) End Sub
End class Public Class Form1
Inherits System.Windows.Forms.Form Public Sub New() MyBase.New() InitializeComponent() End Sub Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub Private components As System.ruponentModel.IContainer <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 266) End Sub Dim g As System.Drawing.Graphics Dim x1, y1, x2, y2 As Integer Dim pen1 As New System.Drawing.Pen(Color.Black) Dim mouseDown As Integer = 0
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown mouseDown = 1 x1 = e.X y1 = e.Y End Sub Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp mouseDown = 0 End Sub Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove If mouseDown = 0 Then Exit Sub Else x2 = e.X y2 = e.Y g = Me.CreateGraphics g.DrawLine(pen1, x1, y1, x2, y2) x1 = x2 y1 = y2 End If End Sub
End Class</source>
Using the mouse to draw on a form
<source lang="vbnet">Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D public class MouseDrawForm
public Shared Sub Main Application.Run(New FrmPainter) End Sub
End class Public Class FrmPainter
Inherits System.Windows.Forms.Form Dim shouldPaint As Boolean = False
- Region " Windows Form Designer generated code "
Public Sub New() MyBase.New() "This call is required by the Windows Form Designer. InitializeComponent() "Add any initialization after the InitializeComponent() call End Sub "Form overrides dispose to clean up the component list. Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean) If disposing Then If Not (components Is Nothing) Then components.Dispose() End If End If MyBase.Dispose(disposing) End Sub "Required by the Windows Form Designer Private components As System.ruponentModel.Container "NOTE: The following procedure is required by the Windows Form Designer "It can be modified using the Windows Form Designer. "Do not modify it using the code editor. <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() " "Form1 " Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(292, 273) Me.Name = "Form1" Me.Text = "Painter" End Sub
- End Region
Private Sub FrmPainter_MouseMove( _ ByVal sender As System.Object, _ ByVal e As System.Windows.Forms.MouseEventArgs) _ Handles MyBase.MouseMove If shouldPaint Then Dim graphic As Graphics = CreateGraphics() graphic.FillEllipse(New SolidBrush(Color.Red), e.X, e.Y, 4, 4) End If End Sub Private Sub FrmPainter_MouseDown(ByVal sender As Object, _ ByVal e As System.Windows.Forms.MouseEventArgs) _ Handles MyBase.MouseDown shouldPaint = True End Sub Private Sub FrmPainter_MouseUp(ByVal sender As Object, _ ByVal e As System.Windows.Forms.MouseEventArgs) _ Handles MyBase.MouseUp shouldPaint = False End Sub
End Class</source>