从上到下的出图效果.frm

Windows API函数,希望大伙有用哦

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3090
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4440
   LinkTopic       =   "Form1"
   ScaleHeight     =   206
   ScaleMode       =   3  'Pixel
   ScaleWidth      =   296
   StartUpPosition =   3  '窗口缺省
   Begin VB.PictureBox Picture2 
      BorderStyle     =   0  'None
      Height          =   4500
      Left            =   0
      ScaleHeight     =   4500
      ScaleWidth      =   4485
      TabIndex        =   1
      Top             =   0
      Width           =   4485
      Begin VB.Timer Timer1 
         Enabled         =   0   'False
         Interval        =   10
         Left            =   720
         Top             =   3210
      End
   End
   Begin VB.PictureBox Picture1 
      AutoRedraw      =   -1  'True
      BorderStyle     =   0  'None
      Height          =   4500
      Left            =   0
      Picture         =   "从上到下的出图效果.frx":0000
      ScaleHeight     =   300
      ScaleMode       =   3  'Pixel
      ScaleWidth      =   299
      TabIndex        =   0
      Top             =   0
      Visible         =   0   'False
      Width           =   4485
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Private Sub Form_Paint()
  Dim P1 As Single, P2 As Single, P3 As Single
  Dim I As Integer, J As Single, T As Integer
   Picture2.Cls
    T = 3
    P2 = T
    P1 = Picture1.Width
    For I = 0 To Picture1.Height Step T
      P3 = I
      BitBlt Form1.Picture2.hDC, 0, P3, P1, P2, Form1.Picture1.hDC, 0, P3, &HCC0020
  ' 延时20 ms
    Sleep 20
    Next I
End Sub