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本文所述为VB实现鼠标绘图的实例，该实例实现线条颜色和线宽可自设，当按下鼠标按键时绘图开始并记录最初的起点，如果不是处在绘图状态则退出该过程，如果处在绘图状态则从起点到目前鼠标所在点绘制直线，然后将当前鼠标所在点作为新的起点，当释放鼠标按键时绘图结束。
具体的功能代码如下：
VERSION 5.00
Object = "{F9043C88-F6F2-101A-A3C9-08002B2F49FB}#1.2#0"; "comdlg32.ocx"
Begin VB.Form Form1
Caption = "鼠标绘图"
ClientHeight = 6420
ClientLeft = 60
ClientTop = 345
ClientWidth = 7710
LinkTopic = "Form1"
ScaleHeight = 6420
ScaleWidth = 7710
StartUpPosition = 3 '窗口缺省
Begin VB.CommandButton Command2
Caption = "清除"
Height = 495
Left = 5640
TabIndex = 7
Top = 1440
Width = 1335
End
Begin VB.Frame Frame1
Caption = "线宽"
Height = 2655
Left = 5520
TabIndex = 2
Top = 2880
Width = 1935
Begin VB.OptionButton Option4
Caption = "8"
Height = 495
Left = 240
TabIndex = 6
Top = 1800
Width = 1215
End
Begin VB.OptionButton Option3
Caption = "4"
Height = 375
Left = 240
TabIndex = 5
Top = 1320
Width = 1335
End
Begin VB.OptionButton Option2
Caption = "2"
Height = 375
Left = 240
TabIndex = 4
Top = 840
Width = 1095
End
Begin VB.OptionButton Option1
Caption = "1"
Height = 255
Left = 240
TabIndex = 3
Top = 480
Value = -1 'True
Width = 1335
End
End
Begin VB.CommandButton Command1
Caption = "设置颜色"
Height = 495
Left = 5640
TabIndex = 1
Top = 600
Width = 1215
End
Begin MSComDlg.CommonDialog CommonDialog1
Left = 4200
Top = 3840
_ExtentX = 847
_ExtentY = 847
_Version = 393216
End
Begin VB.PictureBox Picture1
Height = 5535
Left = 480
ScaleHeight = 5475
ScaleWidth = 4515
TabIndex = 0
Top = 480
Width = 4575
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim x1 As Integer '起点X坐标
Dim y1 As Integer '起点Y坐标
Dim x2 As Integer '终点点X坐标
Dim y2 As Integer '终点Y坐标
Dim flag As Boolean '绘图标志
'设置线的颜色
Private Sub Command1_Click()
On Error Resume Next
CommonDialog1.CancelError = True
CommonDialog1.DialogTitle = "颜色"
CommonDialog1.ShowColor
If Err <> 32755 Then
Picture1.ForeColor = CommonDialog1.Color
End If
End Sub
'清除Picture1中的图形
Private Sub Command2_Click()
Picture1.Cls
End Sub
'设置线宽
Private Sub Option1_Click()
Picture1.DrawWidth = 1
End Sub
Private Sub Option2_Click()
Picture1.DrawWidth = 2
End Sub
Private Sub Option3_Click()
Picture1.DrawWidth = 4
End Sub
Private Sub Option4_Click()
Picture1.DrawWidth = 8
End Sub
Private Sub Form_Load()
Picture1.Scale (0, 0)-(400, 400)
flag = False
End Sub
Private Sub Picture1_MouseDown(Button As Integer, Shift As Integer, _X As Single, Y As Single)
'当按下鼠标按键时绘图开始并记录最初的起点
flag = True
x1 = X
y1 = Y
End Sub
Private Sub Picture1_MouseMove(Button As Integer, Shift As Integer, _X As Single, Y As Single)
'如果不是处在绘图状态则退出该过程
'如果处在绘图状态则从起点到目前鼠标所在点绘制直线
'然后将当前鼠标所在点作为新的起点
If flag = False Then
Exit Sub
End If
If flag = True Then
x2 = X
y2 = Y
Picture1.Line (x1, y1)-(x2, y2)
x1 = x2
y1 = y2
End If
End Sub
Private Sub Picture1_MouseUp(Button As Integer, Shift As Integer, _X As Single, Y As Single)
'当释放鼠标按键时绘图结束
flag = False
End Sub
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程序中备有较为详细的注释，相信读者不难理解，读者可以根据自己的喜好对该程序进行修改，使之更加完善！
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