vbnetgraphic简单的画图程序
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graphic 简单的画图程序
[vb]
Public Class Form1
Dim DrawState As Boolean
Dim PreX As Single
Dim PreY As Single
Dim eP As New Pen(Color.Black, 3) ' 构造黑色画笔，并将它赋给对象变量eP
'Dim g As Graphics = Me.CreateGraphics ' 在窗体上构造一块画布，并将它赋给对象变量g
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
' 将DrawState初始化为False，表示提笔
DrawState = False
End Sub
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As
System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
' 当鼠标左键被按下时，把DrawState设为True，表示落笔开始画线
Dim g As Graphics = Me.CreateGraphics
If e.Button = Windows.Forms.MouseButtons.Left Then
DrawState = True ' 设置画图状态
PreX = e.X ' PreX和PreY保存了线条的起点。
PreY = e.Y
End If
' 当按住鼠标右键时，画一个直径为50的圆
If e.Button = Windows.Forms.MouseButtons.Right Then
g.DrawEllipse(eP, e.X - 25, e.Y - 25, 100, 100)
End If
End Sub
Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
' 当鼠标移动时，如果处于画线状态，则在(PreX，PreY)与(X，Y)之间画一条直线
Dim g As Graphics = Me.CreateGraphics
If DrawState = True Then
g.DrawLine(eP, PreX, PreY, e.X, e.Y)
PreX = e.X
PreY = e.Y
End If
End Sub
Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As
System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
' 当释放鼠标左键时，解除画线状态
If e.Button = Windows.Forms.MouseButtons.Left Then
DrawState = False
End If
End Sub
End Class
Public Class Form1
Dim DrawState As Boolean
Dim PreX As Single
Dim PreY As Single
Dim eP As New Pen(Color.Black, 3) ' 构造黑色画笔，并将它赋给对象变量eP
'Dim g As Graphics = Me.CreateGraphics ' 在窗体上构造一块画布，并将它赋给对象变量g
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
' 将DrawState初始化为False，表示提笔
DrawState = False
End Sub
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As
System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
' 当鼠标左键被按下时，把DrawState设为True，表示落笔开始画线
Dim g As Graphics = Me.CreateGraphics
If e.Button = Windows.Forms.MouseButtons.Left Then
DrawState = True ' 设置画图状态
PreX = e.X ' PreX和PreY保存了线条的起点。
PreY = e.Y
End If
' 当按住鼠标右键时，画一个直径为50的圆
If e.Button = Windows.Forms.MouseButtons.Right Then
g.DrawEllipse(eP, e.X - 25, e.Y - 25, 100, 100)
End If
End Sub
Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As
System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
' 当鼠标移动时，如果处于画线状态，则在(PreX，PreY)与(X，Y)之间画一条直线
Dim g As Graphics = Me.CreateGraphics
If DrawState = True Then