VB6 - Bubble Sort "paper trail"

[Spoo]

This bit of code will display a "paper trail" of (ahem) sorts,
showing the processing of a basic bubble sort algo.

An image of this "paper trail" is attached (below)

On your form you'll need:

• CommandButton named cbSort
• MSHFlexGrid named FG1

Private Sub cbSORT_Click()
    '
    txt0 = "1,11,6,3,8,5,9,10"  ' orignal string
    txt1 = ""                   ' sorted string
    '
    xtr0 = Split(txt0, ",")     ' "temp" array for split (values are strings)
    nn = UBound(xtr0)
    ' 0. populate "real" array with values
    Dim aXTR()
    ReDim aXTR(nn)
    For ii = 0 To nn
        aXTR(ii) = Val(xtr0(ii))
    Next ii
    ns = 0
    ' 1. do bubble sort
    For ii = nn To 0 Step -1
        didswap = 0
        For jj = 0 To ii - 1
            If aXTR(jj) > aXTR(jj + 1) Then
                swap = aXTR(jj)
                aXTR(jj) = aXTR(jj + 1)
                aXTR(jj + 1) = swap
                didswap = 1
                ns = ns + 1
            End If
        Next jj
        If didswap = 0 Then
            Exit For
        End If
    Next ii
    ' 2. create "sorted" txt string
    For ii = 0 To nn
        txt1 = txt1 + Trim(aXTR(ii)) + IIf(ii = nn, "", ",")
    Next ii
    ' 3. set up FG for display purposes
    With FG1
        .Top = 5000
        .Left = 5000
        .Clear
        .Height = (ns + 1) * 240
        .Visible = True
        .Cols = nn + 2
        .Rows = ns + 1
        .FixedCols = 1
        .FixedRows = 1
        tw = 0
        cw = 450
        For ii = 0 To nn + 1
            .ColWidth(ii) = cw
            tw = tw + cw
        Next ii
        .Width = tw
        .TextMatrix(0, 0) = "Pass"
        ' pass 0
        .Row = 0
        For cc = 1 To nn + 1
            .TextMatrix(0, cc) = xtr0(cc - 1)
            .Col = cc
            .CellAlignment = 3
        Next cc
    End With
    ' 4. redo for display purposes
    For ii = 0 To nn
        aXTR(ii) = Val(xtr0(ii))
    Next ii
    ns = 0
    For ii = nn To 0 Step -1
        didswap = 0
        For jj = 0 To ii - 1
            If aXTR(jj) > aXTR(jj + 1) Then
                swap = aXTR(jj)
                aXTR(jj) = aXTR(jj + 1)
                aXTR(jj + 1) = swap
                didswap = 1
                ns = ns + 1
                ' display "paper trail" of what we just did
                With FG1
                    .Row = ns
                    .Col = 0
                    .Text = ns
                    .CellAlignment = 3
                    For cc = 1 To nn + 1
                        .Col = cc
                        .Text = aXTR(cc - 1)
                        .CellAlignment = 3
                        If cc = jj + 1 _
                        Or cc = jj + 2 Then
                            .CellBackColor = RGB(200, 255, 255)
                        End If
                    Next cc
                End With
            End If
        Next jj
        If didswap = 0 Then
            Exit For
        End If
    Next ii
End Sub

... where

• txt0 = "1,11,6,3,8,5,9,10"
• txt1 = "1,3,5,6,8,9,10,11"

Credit to Ellis Dee

• here's his comprehensive sort algos tutorial http://www.vbforums.com/showthread.p...ht=bubble+sort
• here's his bubble sort tutorial http://www.vbforums.com/showpost.php...45&postcount=3

In the image below,

• top row shows original sequence
• each row represents a Pass, and shows the current "swap event"
• the 2 values that were swapped are shown with a cyan backcolor
• bottom row shows fully sorted sequence

Spoo

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