如何使用 vb.net 在 windows 窗体上旋转图片框
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How to rotate a PictureBox on a windows form using vb.net
提问by user39035
I need to rotate a picture box 180 degrees when a condition in my if statement is met. Is this possible?
当满足 if 语句中的条件时，我需要将图片框旋转 180 度。这可能吗？
回答by Thomas
I'll assume that you want to rotate the image inside, because rotating the box itself doesn't make much sense (and is impossible anyway).
我假设你想旋转里面的图像，因为旋转盒子本身没有多大意义（无论如何都是不可能的）。
Try this:
尝试这个：
myPictureBox.Image.RotateFlip(RotateFlipType.Rotate180FlipNone);
回答by Ash
The System.Drawing.Image.RotateFlip() method allows you to rotate the actual image displayed in the picturebox. See this page
System.Drawing.Image.RotateFlip() 方法允许您旋转图片框中显示的实际图像。看这个页面
Dim bitmap1 As Bitmap
Private Sub InitializeBitmap()
Try
bitmap1 = CType(Bitmap.FromFile("C:\Documents and Settings\All Users\" _
& "Documents\My Music\music.bmp"), Bitmap)
PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize
PictureBox1.Image = bitmap1
Catch ex As System.IO.FileNotFoundException
MessageBox.Show("There was an error. Check the path to the bitmap.")
End Try
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
If bitmap1 IsNot Nothing Then
bitmap1.RotateFlip(RotateFlipType.Rotate180FlipY)
PictureBox1.Image = bitmap1
End If
End Sub
回答by Mustaf Mohammeed
PictureBox1.Image.RotateFlip(RotateFlipType.Rotate180FlipNone)
PictureBox1.Refresh()
When you try to rotate your image with:
当您尝试使用以下方法旋转图像时：
PictureBox1.Image.RotateFlip(RotateFlipType.Rotate180FlipNone)
nothing will happen until you close the form and open it again (not the project, just the form). If you want to rotate at once then you should use PictureBox1.Refresh().
在您关闭表单并再次打开它（不是项目，只是表单）之前，什么都不会发生。如果你想一次旋转，那么你应该使用PictureBox1.Refresh().
回答by lakshmanaraj
You grasp the concepts for C++ as given in http://www.codeproject.com/KB/cpp/rimage.aspxand may use for VB.net as given in http://www.eggheadcafe.com/community/aspnet/14/10053817/rotating-picturebox-contr.aspx
您掌握了http://www.codeproject.com/KB/cpp/rimage.aspx 中给出的 C++ 概念， 并且可以使用http://www.eggheadcafe.com/community/aspnet/ 中给出的 VB.net 14/10053817/rotating-picturebox-contr.aspx
