Computer Programming Concepts and Visual Basic David I. Schneider

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272 Computer Programming Concepts and Visual Basic Private Sub ShowLegend() ‘Show legend picEnroll.DrawStyle = 2 picEnroll.Line (.1, 1.05 * maxEnroll)-(.9, 1.05 * maxEnroll) Call Locate(1, 1.1 * maxEnroll) picEnroll.Print “Male” picEnroll.DrawStyle = 1 picEnroll.Line (.1, .95 * maxEnroll)-(.9, .95 * maxEnroll) Call Locate(1, maxEnroll) picEnroll.Print “Female” picEnroll.DrawStyle = 0 picEnroll.Line (.1, .85 * maxEnroll)-(.9, .85 * maxEnroll) Call Locate(1, .9 * maxEnroll) picEnroll.Print “Total” 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 9-11 Chart for Example 2 COMMENT 1. The line charts drawn in Examples 1 and 2 can be printed on the printer instead of displayed in a picture box. Just replace each occurrence of picOutput with Printer, and add Printer.EndDoc as the last statement of the cmdDraw_Click event procedure. Also, the charts will look best in landscape orientation which is invoked with the statement Printer.Orientation = 2
placed before the Scale method is executed. 9.3 BAR CHARTS Drawing bar charts requires a variation of the line statement. If (x1, y1) and (x2, y2) are two points on the screen, then the statement picBox.Line (x1, y1) - (x2, y2), , B draws a rectangle with the two points as opposite corners. If B is replaced by BF, a solid rectangle will be drawn (see Figure 9-12). FIGURE 9-12 Line Method with B and BF Options EXAMPLE 1 The 1998 populations of California and New York are 32 and 18 million, respectively. Draw a bar chart to compare the populations. SOLUTION: The following program produces the chart shown in Figure 9-13. The first five lines are the same as those of a line chart with two pieces of data. The base of the rectangle for California is centered above the point (1, 0) on the x axis and extends .3 unit to the left and right. (The number .3 was chosen arbitrarily; it had to be less than .5 so that the rectangles would not touch.) Therefore, the upper-left corner of the rectangle has coordinates (.7, 32) and the lower-right corner has coordinates (1.3, 0). Figure 9-14 shows the coordinates of the principal points of the rectangles. FIGURE 9-13 Bar Chart for Example 1 Private Sub cmdDisplayPop_Click() ‘Populations of California and New York picPop.Scale (-1, 40)-(3, -5) ‘Specify coordinates picPop.Line (-1, 0)-(3, 0) ‘ Draw x-axis picPop.Line (0, -5)-(0, 40) ‘ Draw y-axis picPop.Line (.7, 32)-(1.3, 0),,BF ‘Draw solid rectangle for CA picPop.Line (1.7, 18)-(2.3, 0),,BF ‘Draw solid rectangle for NY picPop.CurrentY = -1 ‘Vertical position of labels Bar Charts 273
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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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