vb.net筛选颜色 vba筛选变量

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

相关问答

Q1: 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

Q2: vb.net 随机颜色 可追加分数！！！

Dim c As Color '新生成的颜色

Dim r As Byte 'RED

Dim g As Byte 'Green

Dim b As Byte 'Blue

Dim a As Byte 'Alpha 分量值

a = Button1.BackColor.A

r = Button1.BackColor.R

g = Button1.BackColor.G

b = Button1.BackColor.B

Dim rnd As New Random '生成随机数

Dim i As Integer

i = rnd.Next(-10, 10)

r = r + IIf(r + i 255, -i, i)

i = rnd.Next(-10, 10)

g = g + IIf(g + i 255, -i, i)

i = rnd.Next(-10, 10)

b = b + IIf(b + i 255, -i, i)

c = Color.FromArgb(a, r, g, b)

Q3: 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

关于vb.net筛选颜色和vba筛选变量的介绍到此就结束了，不知道你从中找到你需要的信息了吗 ？如果你还想了解更多这方面的信息，记得收藏关注本站。