熱點推薦:
您现在的位置: 電腦知識網 >> 編程 >> .NET編程 >> 正文

vb.net graphic 簡單的畫圖程序

2013-11-13 10:28:04  來源: .NET編程 

  [vb]

  Public Class Form

  Dim DrawState As Boolean

  Dim PreX As Single

  Dim PreY As Single

  Dim eP As New Pen(ColorBlack )          構造黑色畫筆並將它賦給對象變量eP

  Dim g As Graphics = MeCreateGraphics     在窗體上構造一塊畫布並將它賦給對象變量g

  Private Sub Form_Load(ByVal sender As SystemObject ByVal e As SystemEventArgs) Handles MyBaseLoad

   將DrawState初始化為False表示提筆

  DrawState = False

  End Sub

  Private Sub Form_MouseDown(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseDown

   當鼠標左鍵被按下時把DrawState設為True表示落筆開始畫線

  Dim g As Graphics = MeCreateGraphics

  If eButton = WindowsFormsMouseButtonsLeft Then

  DrawState = True     設置畫圖狀態

  PreX = eX          PreX和PreY保存了線條的起點

  PreY = eY

  End If

   當按住鼠標右鍵時畫一個直徑為的圓

  If eButton = WindowsFormsMouseButtonsRight Then

  gDrawEllipse(eP eX eY

  End If

  End Sub

  Private Sub Form_MouseMove(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseMove

   當鼠標移動時如果處於畫線狀態則在(PreXPreY)與(XY)之間畫一條直線

  Dim g As Graphics = MeCreateGraphics

  If DrawState = True Then

  gDrawLine(eP PreX PreY eX eY)

  PreX = eX

  PreY = eY

  End If

  End Sub

  Private Sub Form_MouseUp(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseUp

   當釋放鼠標左鍵時解除畫線狀態

  If eButton = WindowsFormsMouseButtonsLeft Then

  DrawState = False

  End If

  End Sub

  End Class

  Public Class Form

  Dim DrawState As Boolean

  Dim PreX As Single

  Dim PreY As Single

  Dim eP As New Pen(ColorBlack )          構造黑色畫筆並將它賦給對象變量eP

  Dim g As Graphics = MeCreateGraphics     在窗體上構造一塊畫布並將它賦給對象變量g

  Private Sub Form_Load(ByVal sender As SystemObject ByVal e As SystemEventArgs) Handles MyBaseLoad

   將DrawState初始化為False表示提筆

  DrawState = False

  End Sub

  Private Sub Form_MouseDown(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseDown

   當鼠標左鍵被按下時把DrawState設為True表示落筆開始畫線

  Dim g As Graphics = MeCreateGraphics

  If eButton = WindowsFormsMouseButtonsLeft Then

  DrawState = True     設置畫圖狀態

  PreX = eX          PreX和PreY保存了線條的起點

  PreY = eY

  End If

   當按住鼠標右鍵時畫一個直徑為的圓

  If eButton = WindowsFormsMouseButtonsRight Then

  gDrawEllipse(eP eX eY

  End If

  End Sub

  Private Sub Form_MouseMove(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseMove

   當鼠標移動時如果處於畫線狀態則在(PreXPreY)與(XY)之間畫一條直線

  Dim g As Graphics = MeCreateGraphics

  If DrawState = True Then

  gDrawLine(eP PreX PreY eX eY)

  PreX = eX

  PreY = eY

  End If

  End Sub

  Private Sub Form_MouseUp(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseUp

   當釋放鼠標左鍵時解除畫線狀態

  If eButton = WindowsFormsMouseButtonsLeft Then

  DrawState = False

  End If

  End Sub

  End Class

  改法

  [vb]

  Public Class Form

  Dim DrawState As Boolean

  Dim PreX As Single

  Dim PreY As Single

  Dim eP As New Pen(ColorBlack )          構造黑色畫筆並將它賦給對象變量eP

  Dim g As Graphics     在窗體上構造一塊畫布並將它賦給對象變量g

  Private Sub Form_Load(ByVal sender As SystemObject ByVal e As SystemEventArgs) Handles MyBaseLoad

   將DrawState初始化為False表示提筆

  DrawState = False

  End Sub

  Private Sub Form_MouseDown(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseDown

   當鼠標左鍵被按下時把DrawState設為True表示落筆開始畫線

  Dim g As Graphics = MeCreateGraphics

  If eButton = WindowsFormsMouseButtonsLeft Then

  DrawState = True     設置畫圖狀態

  PreX = eX          PreX和PreY保存了線條的起點

  PreY = eY

  End If

   當按住鼠標右鍵時畫一個直徑為的圓

  If eButton = WindowsFormsMouseButtonsRight Then

  gDrawEllipse(eP eX eY

  End If

  End Sub

  Private Sub Form_MouseMove(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseMove

   當鼠標移動時如果處於畫線狀態則在(PreXPreY)與(XY)之間畫一條直線

  Dim g As Graphics = MeCreateGraphics

  If DrawState = True Then

  gDrawLine(eP PreX PreY eX eY)

  PreX = eX

  PreY = eY

  End If

  End Sub

  Private Sub Form_MouseUp(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseUp

   當釋放鼠標左鍵時解除畫線狀態

  If eButton = WindowsFormsMouseButtonsLeft Then

  DrawState = False

  End If

  End Sub

  Private Sub Form_Resize(ByVal sender As Object ByVal e As SystemEventArgs) Handles MeResize

  g = MeCreateGraphics

  End Sub

  End Class

  Public Class Form

  Dim DrawState As Boolean

  Dim PreX As Single

  Dim PreY As Single

  Dim eP As New Pen(ColorBlack )          構造黑色畫筆並將它賦給對象變量eP

  Dim g As Graphics     在窗體上構造一塊畫布並將它賦給對象變量g

  Private Sub Form_Load(ByVal sender As SystemObject ByVal e As SystemEventArgs) Handles MyBaseLoad

   將DrawState初始化為False表示提筆

  DrawState = False

  End Sub

  Private Sub Form_MouseDown(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseDown

   當鼠標左鍵被按下時把DrawState設為True表示落筆開始畫線

  Dim g As Graphics = MeCreateGraphics

  If eButton = WindowsFormsMouseButtonsLeft Then

  DrawState = True     設置畫圖狀態

  PreX = eX          PreX和PreY保存了線條的起點

  PreY = eY

  End If

   當按住鼠標右鍵時畫一個直徑為的圓

  If eButton = WindowsFormsMouseButtonsRight Then

  gDrawEllipse(eP eX eY

  End If

  End Sub

  Private Sub Form_MouseMove(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseMove

   當鼠標移動時如果處於畫線狀態則在(PreXPreY)與(XY)之間畫一條直線

  Dim g As Graphics = MeCreateGraphics

  If DrawState = True Then

  gDrawLine(eP PreX PreY eX eY)

  PreX = eX

  PreY = eY

  End If

  End Sub

  Private Sub Form_MouseUp(ByVal sender As Object ByVal e As SystemWindowsFormsMouseEventArgs) Handles MeMouseUp

   當釋放鼠標左鍵時解除畫線狀態

  If eButton = WindowsFormsMouseButtonsLeft Then

  DrawState = False

  End If

  End Sub

  Private Sub Form_Resize(ByVal sender As Object ByVal e As SystemEventArgs) Handles MeResize

  g = MeCreateGraphics

  End Sub

  End Class


From:http://tw.wingwit.com/Article/program/net/201311/13744.html
    Copyright © 2005-2013 電腦知識網 Computer Knowledge   All rights reserved.