vb.net后台取色 vbnet backgroundworker

VBNET怎么获取控件颜色的RGB值,又怎么用RGB将颜色赋给控件颜色 。R/G/B值最小是0最大是255属Byte值类型
Dim cr As Color = 控件.BackColor '获取控件背景色
Dim alpha As Byte = cr.A '透明度
Dim R As Byte = cr.R 'R值
Dim G As Byte = cr.G 'G值
Dim B As Byte = cr.B 'B值
Dim outAcr As Color = Color.FromArgb(alpha, R, G, B) '创建带有透明通道的ARGB颜色
Dim outcr As Color = Color.FromArgb(R, G, B) '创建不透明的RGB颜色
VB.NET:绘图后,如何才能取得所绘图形的颜色值?加入一个TextBox控件,一个Command控件
代码:
Private Declare Function GetPixel Lib "gdi32" (ByVal hDC As Long, ByVal X As Long, ByVal Y As Long) As Long
Private Declare Function GetWindowDC Lib "user32" (ByVal hWnd As Long) As Long
Private Sub Command1_Click()
Dim Color As Long
WindowDC = GetWindowDC(0) '获取屏幕的设备场景
Color = GetPixel(WindowDC, 500, 100) '获指定点的颜色
'分解RGB颜色值
R = (Color Mod 256) '红色
b = (Int(Color \ 65536)) '蓝色
G = ((Color - (b * 65536) - R) \ 256) '绿色
Text1.BackColor = RGB(R, G, b)
End Sub
在vb.net中,如何获取Graphics中某一指定点(像素)的颜色值?(VB语言)要使用GetPixel函数来取得像素的颜色值,代码如下:
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【vb.net后台取色 vbnet backgroundworker】4
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private void button1_Click(object sender, EventArgs e)
{
Color color = new Bitmap(pictureBox1.Image).GetPixel(10, 10);
MessageBox.Show(color.ToString());
vb.net拾色器设计,要求:能获取图片任意位置的颜色VB可使用Point方法来获取图片指定点的颜色 。
Point 方法
按照长整数,返回在 Form 或 PictureBox 上所指定磅的红-绿-蓝 (RGB) 颜色 。
语法
object.Point(x, y)
'窗体判色代码:
Private Sub Form1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
Text1 = X
Text2 = Y
Text3 = Point(X, Y)
Text4 = (Val(Text3) Mod 65536) Mod 256 'Red
Text5 = (Val(Text3) Mod 65536) \ 256 'Green
Text6 = Val(Text3) \ 65536 'Blue
Shape1.FillColor = RGB(Val(Text4), Val(Text5), Val(Text6))
End Sub
'PictureBox判色代码:
Private Sub Picture1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
Text1 = X
Text2 = Y
Text3 = Picture1.Point(X, Y)
Text4 = (Val(Text3) Mod 65536) Mod 256 'Red
Text5 = (Val(Text3) Mod 65536) \ 256 'Green
Text6 = Val(Text3) \ 65536 'Blue
Shape1.FillColor = RGB(Val(Text4), Val(Text5), Val(Text6))
End Sub
vb.net 对固定坐标取色Using b As New Bitmap(1, 1)
Using g As Graphics = Graphics.FromImage(b)
g.CopyFromScreen(New Point(300, 300), New Point, New Size(1, 1))
PictureBox1.BackColor = b.GetPixel(0, 0)
End Using
End Using
复制当前屏幕左上角位置(300,300)的一个点,取其颜色
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