Computer Programming Concepts and Visual Basic David I. Schneider

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268 Computer Programming Concepts and Visual Basic 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(total() As Single) i As Integer ‘Draw lines connecting data and circle data points For i = 1 To numYears If i < numYears Then picEnroll.Line (i, total(i))-(i + 1, total(i + 1)) End If 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, total() As Single) Dim i As Integer ‘Assume the data have been placed in the file “ENROLL.TXT” ‘(First line of the file is “1960”,453) ‘Read data into arrays, find highest enrollment maxEnroll = 0 Open ”ENROLL.TXT” For Input As #1 For i = 1 To numYears Input #1, label(i), total(i) If total(i) > maxEnroll 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
Private Sub ShowTitle() ‘Display source and title Call Locate(-.5, -.1 * maxEnroll) picEnroll.Print “Source: Statistical Abstract of the United States” Call Locate(.5, 1.2 * maxEnroll) picEnroll.Print “Two-Year College Enrollments (in thousands)” End Sub FIGURE 9-9 Chart for Example 1 Remarks on the program in Example 1 1. The value of tickFactor in the Sub procedure ShowLabels was set to 2 percent of the scale determiners (numYears and maxEnroll) for the x and y axes. This percentage is appropriate for picture boxes that occupy 1/4th to 1/3rd of the screen. Smaller picture boxes might require a factor of 3 percent or 4 percent for good-looking tick marks. Picture boxes that almost fill the screen might have good results with a factor as small as 1 percent. 2. In the Sub procedure ShowLabels, the TextWidth and TextHeight methods were used to obtain the width and height of each label. These values were used together with the coordinates of the appropriate end of the tick mark to assign values to CurrentX and CurrentY for proper placement of the label relative to the graphics. 3. In the event procedure cmdDraw_Click, the number of data points (5) was assigned to the variable numYears, and then numYears was used as a parameter to all other Sub procedures. This feature makes it easy to add additional data to the line chart. For instance, if we decide to include the data for one additional year, we will only have to change the value of numYears and add one more line to the data file. ■ LINE STYLING Patterned, or “styled,” lines can be drawn between two points. Some available line styles are shown in Figure 9-10. Each line has an associated number identifying its style. If s is one of the numbers in the figure, then the statements picBox.DrawStyle = s picBox.Line (a, b)-(c, d) draw the line from (a, b) to (c, d) in the style corresponding to the number s. Line Charts 269
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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 295 and 296: 10.1 LIST BOXES AND COMBO BOXES The
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6. Voting Machine. The members of t
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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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