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Public Class Form1
Dim valTextbox1 As Integer
Dim valTextbox2 As Integer
Dim valTextbox3 As Integer
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
valTextbox3 = valTextbox1 + 135
TextBox3.Text = valTextbox3.ToString
End Sub
Private Sub Rotation(ByVal Angle As Double)
Dim bm_in As New Bitmap(Me.PictureBox1.BackgroundImage)
' Make an array of points defining the image's corners.
Dim wid As Single = bm_in.Width
Dim hgt As Single = bm_in.Height
Dim corners As Point() = { _
New Point(0, 0), _
New Point(wid, 0), _
New Point(0, hgt), _
New Point(wid, hgt)}
' Translate to center the bounding box at the origin.
Dim cx As Single = wid / 2
Dim cy As Single = hgt / 2
Dim i As Long
For i = 0 To 3
corners(i).X -= cx
corners(i).Y -= cy
Next i
' Rotate.
Dim theta As Single = Single.Parse(Angle) * PI / 180.0
Dim sin_theta As Single = Sin(theta)
Dim cos_theta As Single = Cos(theta)
Dim X As Single
Dim Y As Single
For i = 0 To 3
X = corners(i).X
Y = corners(i).Y
corners(i).X = X * cos_theta + Y * sin_theta
corners(i).Y = -X * sin_theta + Y * cos_theta
Next i
' Translate so X >= 0 and Y >=0 for all corners.
Dim xmin As Single = corners(0).X
Dim ymin As Single = corners(0).Y
For i = 1 To 3
If xmin > corners(i).X Then xmin = corners(i).X
If ymin > corners(i).Y Then ymin = corners(i).Y
Next i
For i = 0 To 3
corners(i).X -= xmin
corners(i).Y -= ymin
Next i
' Create an output Bitmap and Graphics object.
Dim bm_out As New Bitmap(CInt(-2 * xmin), CInt(-2 * ymin))
Dim gr_out As Graphics = Graphics.FromImage(bm_out)
' Drop the last corner lest we confuse DrawImage,
' which expects an array of three corners.
ReDim Preserve corners(2)
' Draw the result onto the output Bitmap.
gr_out.DrawImage(bm_in, corners)
' Display the result.
Me.PictureBox1.Image = bm_out
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'affichage de l'image adequate
If CDbl(TextBox1.Text) <= 250 AndAlso CDbl(TextBox2.Text) < 800 Then
Me.PictureBox1.BackgroundImage = My.Resources.img2
ElseIf CDbl(TextBox1.Text) > 250 AndAlso CDbl(TextBox2.Text) > 800 Then
Me.PictureBox1.BackgroundImage = My.Resources.img3
End If
'rotation de l'image
Dim Angle As Double = Me.TextBox3.Text
Rotation(Angle)
End Sub
End Class |
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