VB 版 (精华区)
发信人: student (earth), 信区: VB
标 题: 源码：从数据库中读取数据放入图形中，mschart的应用
发信站: 哈工大紫丁香 (2001年06月15日18:29:34 星期五), 站内信件
VERSION 4.00
Begin VB.Form Form1
Caption = "Form1"
ClientHeight = 4020
ClientLeft = 1140
ClientTop = 1515
ClientWidth = 8055
Height = 4425
Left = 1080
LinkTopic = "Form1"
ScaleHeight = 4020
ScaleWidth = 8055
Top = 1170
Width = 8175
Begin VB.PictureBox picScore
AutoRedraw = -1 'True
Height = 3615
Left = 4080
ScaleHeight = 3555
ScaleWidth = 3915
TabIndex = 1
Top = 0
Width = 3975
End
Begin VB.PictureBox picAge
AutoRedraw = -1 'True
Height = 3615
Left = 0
ScaleHeight = 3555
ScaleWidth = 3915
TabIndex = 0
Top = 0
Width = 3975
End
Begin VB.Label Label1
Alignment = 2 'Center
Caption = "Test Scores"
BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851}
Name = "Times New Roman"
Size = 15.75
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 375
Index = 1
Left = 4080
TabIndex = 3
Top = 3600
Width = 3975
End
Begin VB.Label Label1
Alignment = 2 'Center
Caption = "Ages"
BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851}
Name = "Times New Roman"
Size = 15.75
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
Height = 375
Index = 0
Left = 0
TabIndex = 2
Top = 3600
Width = 3975
End
End
Attribute VB_Name = "Form1"
Attribute VB_Creatable = False
Attribute VB_Exposed = False
Option Explicit
#Const DEBUG_MSGS = 0
Private Const NUM_TESTS = 5
' A record for a student.
Private Type StudentRecord
LastName As String
FirstName As String
Age As Integer
StudentID As Integer
Score(1 To NUM_TESTS) As Integer
End Type
Private NumStudents As Integer
Private Students() As StudentRecord
' Graph the age data.
Private Sub GraphAges()
Dim student As Integer
Dim lft As Single
Dim i As Integer
Dim the_age As Integer
Dim txt As String
Dim font_hgt As Single
' Make a convenient scale.
lft = -NumStudents / 10
picAge.Scale (lft, 21)-(NumStudents + 0.25, -4)
font_hgt = 1.2 * picAge.TextHeight("X")
' Draw the axes.
picAge.Line (0, 20)-(0, 0)
picAge.Line -(NumStudents, 0)
For i = 1 To 19
picAge.Line (-lft / 6, i)-Step(lft / 3, 0)
Next i
For student = 1 To NumStudents
' Draw the student's histogram.
the_age = Students(student).Age
FillColor = QBColor(student Mod 8)
picAge.Line (student - 1, 0)- _
(student, the_age), _
QBColor(student Mod 8), BF
picAge.Line (student - 1, 0)- _
(student, the_age), _
vbBlack, B
' Draw the student's age.
txt = Format$(the_age)
picAge.CurrentX = student - 0.5 - _
picAge.TextWidth(txt) / 2
picAge.CurrentY = the_age - font_hgt
picAge.Print txt
' Draw the student's name.
txt = Students(student).FirstName
picAge.CurrentX = student - 0.5 - _
picAge.TextWidth(txt) / 2
picAge.CurrentY = font_hgt * 0.5
picAge.Print txt
txt = Students(student).LastName
picAge.CurrentX = student - 0.5 - _
picAge.TextWidth(txt) / 2
picAge.CurrentY = font_hgt * 1.5
picAge.Print txt
Next student
End Sub
' Graph the test score data.
Private Sub GraphScores()
Dim test As Integer
Dim lft As Single
Dim i As Integer
Dim the_score As Integer
Dim txt As String
Dim font_hgt As Single
Dim student As Integer
' Make a convenient scale.
lft = -NUM_TESTS / 10
picScore.Scale (1 + lft, 110)-(NUM_TESTS + 0.25, -10)
font_hgt = picScore.TextHeight("X")
' Draw the axes.
picScore.Line (1, 100)-(1, 0)
picScore.Line -(NUM_TESTS, 0)
For i = 10 To 100 Step 10
picScore.Line (1 - lft / 6, i)-Step(lft / 3, 0)
txt = Format$(i)
picScore.CurrentX = 1 + lft / 4 - picScore.TextWidth(txt)
picScore.CurrentY = i - font_hgt / 2
picScore.Print txt
Next i
font_hgt = font_hgt * 1.2
picScore.DrawStyle = vbDot
For test = 1 To NUM_TESTS
picScore.Line (test, 0)-(test, 100)
txt = Format$(test)
picScore.CurrentX = test - picScore.TextWidth(txt) / 2
picScore.CurrentY = font_hgt / 3
picScore.Print txt
Next test
picScore.DrawStyle = vbSolid
' Graph the scores.
For student = 1 To NumStudents
' Use a different color.
picScore.ForeColor = QBColor(student Mod 8)
the_score = Students(student).Score(1)
picScore.CurrentX = 1
picScore.CurrentY = the_score
For test = 2 To NUM_TESTS
the_score = Students(student).Score(test)
picScore.Line -(test, the_score)
Next test
Next student
End Sub
' Load the data from the database.
Private Sub LoadData()
Dim ws As Workspace
Dim db As Database
Dim student_rs As Recordset
Dim score_rs As Recordset
Dim query As String
' Use the default workspace.
Set ws = DBEngine.Workspaces(0)
' Open the database.
Set db = ws.OpenDatabase(App.Path & "\graphdb.mdb")
' Create a Recordset to read name,
' ID, and age information.
query = _
"SELECT FirstName, LastName, " & _
"StudentID, Age FROM Students " & _
"ORDER BY StudentID"
Set student_rs = _
db.OpenRecordset(query, dbOpenSnapshot)
' Read the name, ID, and age information.
With student_rs
Do While Not .EOF
NumStudents = NumStudents + 1
ReDim Preserve Students(1 To NumStudents)
Students(NumStudents).LastName = !LastName
Students(NumStudents).FirstName = !FirstName
Students(NumStudents).Age = !Age
Students(NumStudents).StudentID = !StudentID
#If DEBUG_MSGS = 1 Then
Debug.Print _
Students(NumStudents).FirstName & " " & _
Students(NumStudents).LastName & ", Age: " & _
Students(NumStudents).Age & ", ID: " & _
Students(NumStudents).StudentID
#End If
' Get this student's test scores.
query = _
"SELECT TestNumber, Score FROM " & _
"TestScores WHERE StudentID=" & _
!StudentID & _
" ORDER BY TestNumber"
Set score_rs = _
db.OpenRecordset(query, dbOpenSnapshot)
Do While Not score_rs.EOF
Students(NumStudents).Score( _
score_rs!TestNumber) = _
score_rs!Score
#If DEBUG_MSGS = 1 Then
Debug.Print _
" Score(" & _
Format$(score_rs!TestNumber) & ") = " & _
Students(NumStudents).Score( _
score_rs!TestNumber)
#End If
score_rs.MoveNext
Loop
score_rs.Close
' Go get the next student record.
.MoveNext
Loop
End With
student_rs.Close
' Close the workspace.
ws.Close
End Sub
Private Sub Form_Load()
' Load the data.
LoadData
' Graph the age data.
GraphAges
' Graph the test score data.
GraphScores
End Sub
--
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