Computer Programming Concepts and Visual Basic David I. Schneider

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374 Computer Programming Concepts and Visual Basic when a member variable of class A has class B as its type. Inheritance is a process by which one class (the child class), inherits the properties, methods, and events of another class (the parent class). Visual Basic does not support the strict academic definition of inheritance. In this section, we present programs that illustrate “use” (Example 1) and “containment” (Example 2). In this section we will be setting variables to existing objects. In that case, the proper statement is Set objVar = existingObject EXAMPLE 1 Write a program to create and control two airplane objects (referred to as a bomber and a plane) and a bomb object. The airplane object should keep track of its location (that is, the number of twips from the left side and the top side of the form), be capable of moving in a direction (Right, Up, or Down) specified by the user from a combo box, and should be able to drop a bomb when so commanded. The last task will be carried out by the bomb object. In the event that a bomb dropped from the bomber hits the plane, the plane should disappear. The airplanes and the bomb will have physical representations as pictures inside image controls. By their locations we mean the upperleft corners of their respective image controls.The picture files AIRPLANE.BMP and BOMB.BMP can be found in the Pictures directory of the CD accompanying this textbook. SOLUTION: Object Property Setting frmPlanes BackColor (white) BorderStyle 0-None WindowState 2-Maximized imgBomberPic Picture AIRPLANE.BMP Stretch True imgPlanePic Picture AIRPLANE.BMP Stretch True imgBombPic Picture BOMB.BMP Stretch True Visible False cboDirection List Right Up Down cmdMove Caption Move Bomber cmdDropBomb Caption Drop Bomb cmdQuit Caption Quit ‘Class module for CPlane Private m_imgPlane As Image ‘image control associated with plane Property Let imagePlane(newPlane As Image) Set m_imgPlane = newPlane End Property Public Function Present() As Boolean ‘Determine if the plane is visible ‘Will be needed by the bomb object. If m_imgPlane.Visible Then Present = True Else Present = False End If End Function
Public Function X() As Integer X = m_imgPlane.Left End Function Public Function Y() As Integer Y = m_imgPlane.Top End Function Public Function W() As Integer W = m_imgPlane.Width End Function Public Function H() As Integer H = m_imgPlane.Height End Function Public Sub Fly(ByVal dir As String, ByVal Height As Integer, ByVal Width As Integer) m_imgPlane.Visible = True ‘Meanings of variables ‘dir Direction of airplane (Right, Up, or Down) ‘Height Height of form ‘Width Width of form If dir = “Up” Then ‘Prevent airplane from rising off the screen. If (m_imgPlane.Top - 500)>= 0 Then m_imgPlane.Top = m_imgPlane.Top - 500 End If ElseIf dir = “Down” Then ‘Prevent airplane from falling off the screen. If (m_imgPlane.Top + m_imgPlane.Height + 500)
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Computer Programming Concepts and V
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CONTENTS SECTION 1: PROBLEM SOLVING
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13.3 WEB PAGE PROGRAMMING WITH VBSC
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S E C T I O N 1 PROBLEM SOLVING
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4 Computer Programming Concepts and
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10 Computer Programming Concepts an
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S E C T I O N 2 FUNDAMENTALS OF PRO
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3.1 SUB PROCEDURES, PART I Structur
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The second task performed by the ad
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‘The density (number of people pe
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"Hawaii", 1184000, 6471 "Alaska", 6
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dure by just using the variable in
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Call CalculateSum(x, y, s) Call Dis
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■ FORM-LEVEL VARIABLES Visual Bas
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3. In Appendix D, the section “St
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Private Sub cmdDetermine_Click() Di
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Private Sub cmdCompute_Click() Dim
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preceded with the word ByVal. Built
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It is clear from the hierarchy char
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The meaningful procedure names, alo
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FIGURE 3-9 Sample Run for Programmi
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4.1 RELATIONAL AND LOGICAL OPERATOR
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(a) (2 < n) And (n < 6) (b) (2 < n)
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SOLUTION: In the following program,
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The Else part of an If block can be
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picTax.Cls picTax.Print “Your FIC
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Case 4, 5 picOutcome.Print “You a
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EXAMPLE 3 The following program use
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Case Else picResult.Print “The st
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4. The items in the value list must
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The hierarchy chart in Figure 4-4 s
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‘Program to compute employees’
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Private Function TaxMarried(adjPay
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and tells us whether the food meets
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S E C T I O N 5 REPETITION
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132 Computer Programming Concepts a
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S E C T I O N 6 ARRAYS
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S E C T I O N 7 SEQUENTIAL FILES
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S E C T I O N 8 RANDOM-ACCESS FILES
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S E C T I O N 9 THE GRAPHICAL DISPL
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10.1 LIST BOXES AND COMBO BOXES The
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Private Sub cmdAdd_Click() Dim item
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either typing in information or jus
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Private Sub cmdDisplay_Click() picF
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clicks on the square to toggle betw
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circle and the button is said to be
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hsbBar.Value changes accordingly. T
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THE SHAPE CONTROL The shape control
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FIGURE 10-9 A Picture Created with
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Rows 9 ScrollBars 0 - flexScrollBar
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Private Sub cmdQuit_Click() End End
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Here, the menu bar contains two men
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Clipboard.Clear deletes the content
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cedures that are available to all f
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The Flags property influences certa
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13. Additional forms serve as new w
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6. Voting Machine. The members of t
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Page 413: A P P E N D I C E S
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CANCEL The Cancel property provides
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COLS and ROWS The Cols and Rows pro
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DEFINT, DEFLNG, DEFSNG, DEFDBL, DEF
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ENVIRON Visual Basic has an environ
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FONT.ITALIC or FONTITALIC These pro
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yields “1234.”, Format(1234000,
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the length of the string currently
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ISNUMERIC The value of the function
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Unlock statement is used to remove
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Focus Default Default Number First
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OR (Logical Operator) The logical e
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the same as in the original Dimensi
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SECOND The function Second extracts
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STRETCH When the Stretch property o
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UNLOCK The Unlock command is intend
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[COLOR]: Numbers written in base 16
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Appendix D 457
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466 Technology of the Internet D Da
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468 Technology of the Internet Rela
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470 Technology of the Internet 2. D
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SYSTEM REQUIREMENTS CD-ROM INSTRUCT
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Computer Programming Concepts and Visual Basic David I. Schneider

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