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Picture Commands

by Michael L. Canejo (28 Submissions)
Category: VB function enhancement
Compatability: Visual Basic 3.0
Difficulty: Advanced
Date Added: Wed 3^rd February 2021
Rating: (1 Votes)

This includes the source code for Rotating a Picture 45 Degrees, Flipping a Picture Horizontally, and Flipping a Picture Vertically! Very usefull if your working on your own picture editing program.
Questions: [email protected]

Assumes
'Please follow these simple steps. DONT SKIP ANYTHING! '1.) Make a New Project in your 32bit Visual Basic '2.) Add a New Module(Module1.Bas) to the New Project '3.) Add a PictureBox to the Form(Picture1)and Insert a Picture in the 'PictureBox '4.) Add a PictureBox to the Form(Picture2)and keep it blank '5.) Add a CommandButton to the Form(Command1) '6.) Add a CommandButton to the Form(Command2) '7.) Add a CommandButton to the Form(Command3) 'Thats it, hope you followed EVERY step.
API Declarations
'Copy and Paste the following into the New Module(Module1.Bas)..not in the form!
Global Const SRCCOPY = &HCC0020
Global Const Pi = 3.14159265359
Declare Function SetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal crColor As Long) As Long
Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long
Declare Function StretchBlt Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long
Sub bmp_rotate(pic1 As PictureBox, pic2 As PictureBox, ByVal theta!)
'Rotate the image in a picture box.
'pic1 is the picture box with the bitmap to rotate
'pic2 is the picture box to receive the rotated bitmap
'theta is the angle of rotation

Dim c1x As Integer, c1y As Integer
Dim c2x As Integer, c2y As Integer
Dim a As Single
Dim p1x As Integer, p1y As Integer
Dim p2x As Integer, p2y As Integer
Dim n As Integer, r As Integer

c1x = pic1.ScaleWidth \ 2
c1y = pic1.ScaleHeight \ 2
c2x = pic2.ScaleWidth \ 2
c2y = pic2.ScaleHeight \ 2
If c2x < c2y Then n = c2y Else n = c2x
n = n - 1
pic1hDC% = pic1.hdc
pic2hDC% = pic2.hdc
For p2x = 0 To n
For p2y = 0 To n
If p2x = 0 Then a = Pi / 2 Else a = Atn(p2y / p2x)
r = Sqr(1& * p2x * p2x + 1& * p2y * p2y)
p1x = r * Cos(a + theta!)
p1y = r * Sin(a + theta!)
c0& = GetPixel(pic1hDC%, c1x + p1x, c1y + p1y)
c1& = GetPixel(pic1hDC%, c1x - p1x, c1y - p1y)
c2& = GetPixel(pic1hDC%, c1x + p1y, c1y - p1x)
c3& = GetPixel(pic1hDC%, c1x - p1y, c1y + p1x)
If c0& <> -1 Then xret& = SetPixel(pic2hDC%, c2x + p2x, c2y + p2y, c0&)
If c1& <> -1 Then xret& = SetPixel(pic2hDC%, c2x - p2x, c2y - p2y, c1&)
If c2& <> -1 Then xret& = SetPixel(pic2hDC%, c2x + p2y, c2y - p2x, c2&)
If c3& <> -1 Then xret& = SetPixel(pic2hDC%, c2x - p2y, c2y + p2x, c3&)
Next

t% = DoEvents()
Next
End Sub

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