form1.frm

好用啊

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "画图"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  'Windows Default
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim sngDrawWidth As Single                ' 模块级变量，保存线条宽度
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, _
X As Single, Y As Single)
    If Button = 1 Then                                  ' 如果按下左键
         CurrentX = X: CurrentY = Y                     ' 设置画线起点
         sngDrawWidth = 1                               ' 设置线条初始宽度
         DrawWidth = sngDrawWidth
    End If
End Sub

Private Sub Form_MouseMove(Button As Integer, Shift As Integer, _
X As Single, Y As Single)
    Dim lngDrawColor As Long
    If Button = 1 Then                           ' 使用不同颜色
        If Shift = 1 Then
            lngDrawColor = RGB(255, 0, 0)
        ElseIf Shift = 2 Then
            lngDrawColor = vbGreen
        ElseIf Shift = 4 Then
            lngDrawColor = &HFF0000
        End If
        sngDrawWidth = sngDrawWidth + 0.1                  ' 加宽线条
        DrawWidth = sngDrawWidth
        Line -(X, Y), lngDrawColor                          ' 画线
    End If
End Sub