Computer Programming Concepts and Visual Basic David I. Schneider

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282 Computer Programming Concepts and Visual Basic Private Sub ShowTitle(radius As Single) Dim lbl As String, lblWid As Single ‘Display title right below circle lbl = “Browser Market Share, July 1998” lblWid = picShare.TextWidth(lbl) Call Locate(-lblWid / 2, -(radius + .05)) picShare.Print lbl End Sub FIGURE 9-23 Display from Example 5 SUMMARY 1. Data can be vividly displayed in line, bar, clustered bar, and pie charts. 2. The programmer can select his or her own coordinate system with the Scale method. 3. The Line method draws lines, rectangles, and solid rectangles. Styled lines can be drawn by assigning appropriate values to the DrawStyle property. 4. The Circle method is used to draw circles, radius lines, and sectors. Each radius line is specified by a number between 0 and 1. The number 2 * π(or 6.283185) is used by the Circle method when drawing radii and sectors. 5. The PSet method turns on a single point and is useful in graphing functions. 6. The FillStyle property allows circles, sectors, and rectangles to be filled with one of eight patterns, and the FillColor property allows them to appear in assorted colors. PROGRAMMING PROJECTS 1. Look in magazines and newspapers for four sets of data, one suited to each type of chart discussed in this chapter. Write programs to display the data in chart form.
2. Figure 9-24 is called a horizontal bar chart. Write a program to produce this chart. FIGURE 9-24 Horizontal Bar Chart 3. Figure 9-25 is called a segmented bar chart. Write a program to construct this chart. FIGURE 9-25 Segmented Bar Chart 4. Figure 9-26 is called a range chart. Using the data in Table 9.3, write a program to produce this chart. FIGURE 9-26 Range Chart Programming Projects 283
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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 240 and 241: 232 Computer Programming Concepts a
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
Page 297 and 298: Private Sub cmdAdd_Click() Dim item
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Page 307 and 308: hsbBar.Value changes accordingly. T
Page 309 and 310: THE SHAPE CONTROL The shape control
Page 311 and 312: FIGURE 10-9 A Picture Created with
Page 313 and 314: Rows 9 ScrollBars 0 - flexScrollBar
Page 315 and 316: Private Sub cmdQuit_Click() End End
Page 317 and 318: Here, the menu bar contains two men
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Page 331 and 332: 11.1 AN INTRODUCTION TO DATABASES T
Page 333 and 334: 9. Click on the down arrow to the r
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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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