vb.net 如何在 Visual Basic 2010 中获取图片框控件中像素的颜色
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How do i get the colour of a pixel in a picturebox control in visual basic 2010
提问by Dean
Does anyone know a way to get the colour value of a pixel in a picturebox control when it is clicked in visual basic 2010?
有没有人知道在visual basic 2010中单击时获取图片框控件中像素颜色值的方法？
I have created a small paint application which im using in a kiddies game but I do not want the children to colour over the outline of the image they are colouring in. So to do so I need to check if the currently clicked pixel in the picturebox is not black.
我创建了一个小型绘画应用程序，我在儿童游戏中使用它，但我不希望孩子们在他们正在着色的图像的轮廓上着色。因此，我需要检查图片框中当前单击的像素不是黑色的。
e.g. in pseudo code
例如在伪代码中
if colour not black then
Allow pixel to be changed to current colour
else
Do nothing
end if
回答by
This is one way you can get a pixel from PictureBox:
这是您可以从 PictureBox 获取像素的一种方法：
Private Function GetColor(pic As PictureBox, X As Integer, Y As Integer) As Color
If pic Is Nothing Then Return Nothing
Using tmp As New Bitmap(pic.ClientSize.Width, pic.ClientSize.Height)
Dim r As New Rectangle(0, 0, tmp.Width, tmp.Height)
Using g As Graphics = Graphics.FromImage(tmp)
g.DrawImage(pic.Image, r, r, GraphicsUnit.Pixel)
End Using
Return tmp.GetPixel(X, Y)
End Using
End Function
Just call it like this:
就这样称呼它：
Dim col As Color = GetColor(PictureBox1, someX, someY)
