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

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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

VB.NET 获取当前鼠标点的RGB

Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown

Dim GetColor As Color = CType(PictureBox1.Image, Bitmap).GetPixel(e.X, e.Y)

TextBox3.Text = GetColor.B.ToString

TextBox2.Text = GetColor.G.ToString

TextBox1.Text = GetColor.R.ToString

End Sub

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 rgb函数设置颜色

比如设置窗体颜色，代码如下：

Private Sub Command1_Click()

Form1.BackColor = RGB(255, 222, 14)

End Sub

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