Computer Programming Concepts and Visual Basic David I. Schneider

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270 Computer Programming Concepts and Visual Basic FIGURE 9-10 Line Patterns Styling is useful when displaying several line charts on the same coordinate system. EXAMPLE 2 Alter the program in Example 1 so that it will draw line charts displaying the male, female, and total enrollments of 2-year colleges. SOLUTION: The data file must be changed to contain the enrollment figures for males and females, and arrays must be created to hold this information. The totals can be computed from the other numbers. The styled lines for male and female enrollments must be drawn. Finally, legends must be given to identify the different line charts. Figure 9-11 shows the picture box that results from the modified program. ‘In (Declarations) section of (General) Dim numYears As Integer, maxEnroll As Single Private Sub cmdDraw_Click() ‘Line Charts of Two-Year College Enrollments numYears = 5 ReDim label(1 To numYears) As String ReDim male(1 To numYears) As Single ReDim female(1 To numYears) As Single ReDim total(1 To numYears) As Single Call ReadData(label(),male(),female(),total()) Call DrawAxes Call DrawData(male(), female(), total()) Call ShowTitle Call ShowLabels(label()) Call ShowLegend End Sub Private Sub DrawAxes() ‘Draw axes picEnroll.Scale (-1, 1.2 * maxEnroll) - (numYears + 1, -.2 * maxEnroll) picEnroll.Line (-1, 0)-(numYears + 1, 0) picEnroll.Line (0, -.1 * maxEnroll)-(0, 1.1 * maxEnroll) End Sub Private Sub DrawData(male() As Single, female() As Single, total() As Single) Dim i As Integer For i = 1 To numYears If i < numYears Then ‘Draw lines connecting data points picEnroll.DrawStyle = 2 picEnroll.Line (i, male(i))-(i + 1, male(i + 1)) picEnroll.DrawStyle = 1
picEnroll.Line (i, female(i))-(i + 1, female(i + 1)) picEnroll.DrawStyle = 0 picEnroll.Line (i, total(i))-(i + 1, total(i + 1)) End If ‘Draw small circles around data points picEnroll.Circle (i, male(i)), .01 * numYears picEnroll.Circle (i, female(i)), .01 * numYears picEnroll.Circle (i, total(i)), .01 * numYears Next i End Sub Private Sub Locate(x As Single, y As Single) picEnroll.CurrentX = x picEnroll.CurrentY = y End Sub Private Sub ReadData(label() As String, male() As Single, _ female() As Single, total() As Single) ‘The two lines above should be enter as one line Dim i As Integer ‘Assume the data has been placed in the file “ENROLLMF.TXT” ‘as Year, male, female ‘(First line of file is “1960”,283,170) ‘Read data into arrays, find highest enrollment Open ”ENROLLMF.TXT” For Input As #1 maxEnroll = 0 For i = 1 To numYears Input #1, label(i), male(i), female(i) total(i) = male(i) + female(i) If maxEnroll < total(i) Then maxEnroll = total(i) End If Next i Close #1 End Sub Private Sub ShowLabels(label() As String) Dim i As Integer, lbl As String, lblWid As Single Dim lblHght As Single, tickFactor As Single ‘Draw tick marks and label them For i = 1 To numYears lbl = Right(label(i), 2) lblWid = picEnroll.TextWidth(lbl) tickFactor = .02 * maxEnroll picEnroll.Line (i, -tickFactor)-(i, tickFactor) Call Locate(i - lblWid / 2, -tickFactor) picEnroll.Print lbl Next i lbl = Str(maxEnroll) lblWid = picEnroll.TextWidth(lbl) lblHght = picEnroll.TextHeight(lbl) tickFactor = .02 * numYears picEnroll.Line (-tickFactor, maxEnroll)-(tickFactor, maxEnroll) Call Locate(-tickFactor - lblWid, maxEnroll - lblHght / 2) picEnroll.Print lbl End Sub Line Charts 271
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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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Page 251: S E C T I O N 8 RANDOM-ACCESS FILES
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Page 295 and 296: 10.1 LIST BOXES AND COMBO BOXES The
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Page 309 and 310: THE SHAPE CONTROL The shape control
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Page 315 and 316: Private Sub cmdQuit_Click() End End
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11.1 AN INTRODUCTION TO DATABASES T
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9. Click on the down arrow to the r
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clicked or a Move, Update, Delete,
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Do While (Not foundFlag) And (Not d
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mary key. Databases of student enro
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question mark stands for a single c
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1995 populations. When the second c
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If a Find method does not locate a
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place an x in the check box next to
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population (in descending order). W
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Creating and Designing Databases 34
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9. When all fields have been specif
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Creating and Designing Databases 34
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TABLE 11.5(B) TABLE 11.5(C) course
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(a) Update the quantity field of th
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12.1 CLASSES AND OBJECTS noun A wor
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Task Statement Assign a value to a
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EXAMPLE 1 and then an instance of t
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[Run, enter the data for a student
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SOLUTION: Object Property Setting f
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4. Methods can be either Function o
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‘Student Class (CStudent) Private
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txtFinal.Text = “” picGrades.Pr
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■ EVENTS In the previous section
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frmCircles.ForeColor = vbRed ‘Mak
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Public Function X() As Integer X =
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End Sub Private Sub cmdDropBomb_Cli
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Next i End Sub Public Function Read
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Remove method. The number of object
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S E C T I O N 13 COMMUNICATING WITH
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A P P E N D I C E S
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APPENDIX C VISUAL BASIC STATEMENTS,
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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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