VB绘画圆形时钟

'在窗体中添加一个Timer控件，将Interval设为1000。
Option Explicit

Const PI = 3.1415926
Dim BaseX As Integer, BaseY As Integer, R As Integer
Dim r1 As Integer, r2 As Integer, r3 As Integer

Private Sub Form_Load()
Me.ScaleMode = 3
Me.AutoRedraw = True
If Me.Width < 3000 Then Me.Width = 3000
If Me.Height < 3000 Then Me.Height = 3000
End Sub

Private Sub Init() '绘制钟盘
Dim i As Integer
BaseX = Me.ScaleWidth / 2
BaseY = Me.ScaleHeight / 2
R = IIf(BaseX > BaseY, BaseY * 0.8, BaseY * 0.8)
r1 = R * 0.2
r2 = R * 0.1
r3 = R * 0.05
For i = 0 To 360 Step 6
If i Mod 30 = 0 Then '时
Me.DrawWidth = 5
DrawLine BaseX + (R - 3) * Sin(i * PI / 180), BaseY - (R - 3) * Cos(i * PI / 180), BaseX + (R - 8) * Sin(i * PI / 180), BaseY - (R - 8) * Cos(i * PI / 180), 3
Else '分
Me.DrawWidth = 2
Me.PSet (BaseX + (R - 3) * Sin(i * PI / 180), BaseY - (R - 3) * Cos(i * PI / 180))
End If
Next
Me.DrawWidth = 1
Me.Circle (BaseX, BaseY), R '绘制圆形
Call DrawClock '调用绘制指针
End Sub

'绘制指针
Private Sub DrawClock()
Dim Second As Integer
Dim Minute As Integer
Dim Hours As Integer
Second = DatePart(“s”, Time)
Minute = DatePart(“n”, Time)
Hours = DatePart(“h”, Time)
If Hours > 12 Then
Hours = Hours - 12
End If
Me.DrawWidth = 1
Me.Circle (BaseX, BaseY), 8
DrawLine BaseX - r1 * Sin(Second * PI / 30), BaseY + r1 * Cos(Second * PI / 30), BaseX + (R - 10) * Sin(Second * PI / 30), BaseY - (R - 10) * Cos(Second * PI / 30), 0
DrawLine BaseX - r2 * Sin(Minute * PI / 30), BaseY + r2 * Cos(Minute * PI / 30), BaseX + R * 0.8 * Sin(Minute * PI / 30), BaseY - R * 0.8 * Cos(Minute * PI / 30), 1
DrawLine BaseX - r3 * Sin((Hours + Minute / 60) * PI / 6), BaseY + r3 * Cos((Hours + Minute / 60) * PI / 6), BaseX + R * 0.6 * Sin((Hours + Minute / 60) * PI / 6), BaseY - R * 0.6 * Cos((Hours + Minute / 60) * PI / 6), 2
End Sub

'画线函数
Private Sub DrawLine(x1 As Integer, y1 As Integer, x2 As Integer, y2 As Integer, Flag As Integer)
Static OldSX1 As Integer, OldSX2 As Integer, OldSY1 As Integer, OldSY2 As Integer
Static OldMX1 As Integer, OldMX2 As Integer, OldMY1 As Integer, OldMY2 As Integer
Static OldHX1 As Integer, OldHX2 As Integer, OldHY1 As Integer, OldHY2 As Integer

Select Case Flag
Case 0
Me.DrawWidth = 1
Me.Line (OldSX1, OldSY1)-(OldSX2, OldSY2), Me.BackColor
Me.Line (x1, y1)-(x2, y2)
OldSX1 = x1
OldSX2 = x2
OldSY1 = y1
OldSY2 = y2
Case 1
Me.DrawWidth = 2
Me.Line (OldMX1, OldMY1)-(OldMX2, OldMY2), Me.BackColor
Me.Line (x1, y1)-(x2, y2)
OldMX1 = x1
OldMX2 = x2
OldMY1 = y1
OldMY2 = y2
Case 2
Me.DrawWidth = 3
Me.Line (OldHX1, OldHY1)-(OldHX2, OldHY2), Me.BackColor
Me.Line (x1, y1)-(x2, y2)
OldHX1 = x1
OldHX2 = x2
OldHY1 = y1
OldHY2 = y2
Case Else
Me.Line (x1, y1)-(x2, y2)
End Select
End Sub

Private Sub Form_Resize()
Me.Cls: Call Init
End Sub

Private Sub Timer1_Timer()
Call DrawClock '调用绘制指针
End Sub