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Visual Basic Graphics Programming (2nd Edition)
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Visual Basic Graphics Programming 2nd Edition.iso
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Ch13
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Twist.cls
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1999-06-20
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820b
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35 lines
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "DistortTwist"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Option Explicit
Implements Distortion
' The center about which to twist.
Public cx As Single
Public cz As Single
Public period As Single
Public offset As Single
' Transform the point.
Private Sub Distortion_Transform(X As Single, Y As Single, Z As Single)
Dim theta As Single
theta = (offset - Y) * 3.14 / period
X = X * Cos(theta) - Z * Sin(theta)
Z = X * Sin(theta) + Z * Cos(theta)
End Sub