A Rainbow Generator

Posted: 2002-06-01
By: ArchiveBot
Viewed: 151

Filed Under:

Visual Basic 6

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It is an extremly simple Rainbow Generator - the code which was always asked by the viewers. See how a rainbow is generated with the varaitions in the values of primary colors - Red, Green and Blue. No API's used. Interesting and Full of Fun! Easy even for beginners!

Original Author: K. O. Thaha Hussain

Code

'(C)2001 K. O. Thaha Hussain. India
' Analyst Programmer
' All Rights Reserved
' URL : www.bcity.com/thahahussain
' Company : www.induswareonline.com
Option Explicit
Private Sub Form_Load()
Me.AutoRedraw = True
Me.ScaleMode = vbTwips
Me.Caption = "Rainbow Generator by " & _
   "K. O. Thaha Hussain"
MsgBox "Resize the window to resize the Rainbow", , _
  "Thaha Hussain's Rainbow Generator"
End Sub
Private Sub Form_Resize()
Call Rainbow
End Sub
Private Sub Rainbow()
On Error Resume Next
Dim Position As Integer, Red As Integer, Green As _
    Integer, Blue As Integer
Dim ScaleFactor As Double, Length As Integer
ScaleFactor = Me.ScaleWidth / (255 * 6)
Length = Int(ScaleFactor * 255)
Position = 0
Red = 255
Blue = 1
'Purposfully avoided nested loops
'------------- 1
For Green = 1 To Length
Me.Line (Position, 0)-(Position, Me.ScaleHeight), _
   RGB(Red, Green ScaleFactor, Blue)
Position = Position + 1
Next Green
'--------------- 2
For Red = Length To 1 Step -1
Me.Line (Position, 0)-(Position, Me.ScaleHeight), _
   RGB(Red ScaleFactor, Green, Blue)
Position = Position + 1
Next Red
'---------------- 3
For Blue = 0 To Length
Me.Line (Position, 0)-(Position, Me.ScaleHeight), _
   RGB(Red, Green, Blue ScaleFactor)
Position = Position + 1
Next Blue

'----------------- 4
For Green = Length To 1 Step -1
Me.Line (Position, 0)-(Position, Me.ScaleHeight), _
   RGB(Red, Green ScaleFactor, Blue)
Position = Position + 1
Next Green

'------------------ 5
For Red = 1 To Length
Me.Line (Position, 0)-(Position, Me.ScaleHeight), _
   RGB(Red ScaleFactor, Green, Blue)
Position = Position + 1
Next Red
'------------------- 6
For Blue = Length To 1 Step -1
Me.Line (Position, 0)-(Position, Me.ScaleHeight), _
   RGB(Red, Green, Blue ScaleFactor)
Position = Position + 1
Next Blue
End Sub


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