main.frm

来自「很好的教程原代码！」· FRM 代码 · 共 57 行

VERSION 5.00
Begin VB.Form Main 
   Caption         =   "用鼠标点选直线"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
End
Attribute VB_Name = "Main"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub Command1_Click()
    LineDDA 100, 100, 105, 105, AddressOf LineDDAProc, 0
End Sub

Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    Dim i As Integer, selected As Boolean
    ' 判断第一条线
    nPoints = 0
    LineDDA 20, 20, 200, 200, AddressOf LineDDAProc, 0
    For i = 0 To nPoints - 1
        If ((pX(i) - X) ^ 2 + (pY(i) - Y) ^ 2) ^ 0.5 < 3 Then
            MsgBox "您点选的是 (20, 20) - (200, 200) 线段!"
            selected = True
            Exit For
        End If
    Next
    ' 判断第二条线
    nPoints = 0
    LineDDA 20, 150, 200, 50, AddressOf LineDDAProc, 0
    For i = 0 To nPoints - 1
        If ((pX(i) - X) ^ 2 + (pY(i) - Y) ^ 2) ^ 0.5 < 3 Then
            MsgBox "您点选的是 (20, 150) - (200, 50) 线段!"
            selected = True
            Exit For
        End If
    Next
    If Not selected Then
        MsgBox "您没有点选到任何线段!"
    End If
End Sub

Private Sub Form_Paint()
    Me.ScaleMode = vbPixels
    Line (20, 20)-(200, 200)
    Line (20, 150)-(200, 50)
End Sub