[英]Pick color from a Picturebox with SizeMode ZOOM
如何從縮放圖片框中獲取點的顏色(鼠標光標的位置)?
我當前的代碼不起作用
Private Sub pickColor(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles picBox.MouseClick
Dim TempBitmap As New Bitmap(picBox.Image)
Dim MyColor As Color
MyColor = TempBitmap.GetPixel(e.X, e.Y)
End Sub
您可以嘗試如下操作:
Private Sub pickColor(ByVal sender As Object, ByVal e As MouseEventArgs) _
Handles picBox.MouseClick
Using bmp As New Bitmap(picBox.ClientSize.Width, _
picBox.ClientSize.Height)
picBox.DrawToBitmap(bmp, picBox.ClientRectangle)
MessageBox.Show(bmp.GetPixel(e.X, e.Y).ToString())
End Using
End Sub
我不知道有一種叫做DrawToBitmap
方法。 @LatsTech比我的要好得多。 我的解決方案只是嘗試重新創建Picturebox在Bitmap中的內容。
Private Sub PictureBox1_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseClick
Dim bits As New Bitmap(PictureBox1.Width, PictureBox1.Height)
Dim context As Graphics = Graphics.FromImage(bits)
'' Create picturebox background
context.FillRectangle(New SolidBrush(PictureBox1.BackColor), _
0, 0, bits.Width, bits.Height)
'' Try to reproduce zoomed image thumbnail
Dim ratio As Double = 1.0
Dim imageWidth As Integer = PictureBox1.Image.Width
Dim imageHeight As Integer = PictureBox1.Image.Height
If imageWidth > bits.Width Then
ratio = bits.Width / imageWidth
imageWidth = bits.Width
imageHeight *= ratio
End If
If imageHeight > bits.Height Then
ratio = bits.Height / imageHeight
imageHeight = bits.Height
imageWidth *= ratio
End If
context.DrawImage(PictureBox1.Image, _
New Rectangle((bits.Width - imageWidth) / 2, _
(bits.Height - imageHeight) / 2, _
imageWidth, imageHeight), _
New Rectangle(0, 0, PictureBox1.Image.Width, _
PictureBox1.Image.Height), _
GraphicsUnit.Pixel)
MsgBox(bits.GetPixel(e.X, e.Y).ToString)
End Sub
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