有一个名称为Fom1的窗体,上面没有控件,设有以下程序(其中方法PSet(X,Y)的功能是在坐标X,Y处画一个点): Dim cmdmave As Boolean Private Sub Form_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single) cmdmave=True End Sub Private Sub Form_MouseMove(Button AS Integer,Shift As Integer,X AS Single,Y As Single) If cmdmave Then Forml.PSet(X,Y) End lf End Sub Private Sub Form_MouseUp(Button As Integer,Shift As Integer,X As Single,Y As Single) cmdmave=False End Sub 此程序的功能是。 A.每按下鼠标键一次,在鼠标所指位置画一个点 B.按下鼠标键,则在鼠标所指位置画一个点;放开鼠标键,则此点消失 C.不按鼠标键而拖动鼠标,则沿鼠标拖动的轨迹画一条线 D.按下鼠标键并拖动鼠标,则沿鼠标拖动的轨迹画一条线,放开鼠标键则结束画线

有一个名称为Fom1的窗体,上面没有控件,设有以下程序(其中方法PSet(X,Y)的功能是在坐标X,Y处画一个点): Dim cmdmave As Boolean Private Sub Form_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single) cmdmave=True End Sub Private Sub Form_MouseMove(Button AS Integer,Shift As Integer,X AS Single,Y As Single) If cmdmave Then Forml.PSet(X,Y) End lf End Sub Private Sub Form_MouseUp(Button As Integer,Shift As Integer,X As Single,Y As Single) cmdmave=False End Sub 此程序的功能是。 A.每按下鼠标键一次,在鼠标所指位置画一个点 B.按下鼠标键,则在鼠标所指位置画一个点;放开鼠标键,则此点消失 C.不按鼠标键而拖动鼠标,则沿鼠标拖动的轨迹画一条线 D.按下鼠标键并拖动鼠标,则沿鼠标拖动的轨迹画一条线,放开鼠标键则结束画线


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( 33 )有一个名称为 Form1 的窗体,上面没有控件,设有以下程序(其中方法 Pset(X,Y) 的功能是在坐标X , Y 处画一个点):Dim cmdmave As BooleanPrivate Sub Form_MouseDown(Button As Integer,Shift As Integer, X As Single,Y As Single)cmdmave = TrueEnd SubPrivate Sub Form_MouseMove(Button As Integer,Shift As Integer, X As Single, Y As Single)If cmdmave ThenForm1.Pset(X,Y)End IfEnd SubPrivate Sub Form_MouseUp(Button As Integer, Shift As Integer, X As Single,Y As Single)cmdmave = FalseEnd Sub此程序的功能是A )每按下鼠标键一次,在鼠标所指位置画一个点B )按下鼠标键,则在鼠标所指位置画一个点;放开鼠标键,则此点消失C )不按鼠标键而拖动鼠标,则沿鼠标拖动的轨迹画一条线D )按下鼠标键并拖动鼠标,则沿鼠标拖动的轨迹画一条线,放开鼠标键则结束画线

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