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 如何对图片实现颜色识别

没明白你意思,看看是这样么?Dim PGet As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(picture)for i=1 to picture.heightfor j=1 to picture.widthPGet .GetPixel(j, i)nextnext

vb 快速找图找色

FOR不会用多少时间,只是比较的话你只要算法OK,速度是很快的,比较不需要运算,不会耗时太多,几十毫秒就行了

如何 用 VB 在规定的范围 找图,找色..源码

'下面是屏幕找色实例，请根据实际情况进行验证。

Option Explicit

'定义一个POINTAPI

Private Type POINTAPI

x As Long

y As Long

End Type

'定义一个找色区域

Private Type RECT

Left As Long '区域坐标x

Top As Long '区域坐标y

Right As Long '区域宽

Bottom As Long '区域高

End Type

'Windows API 声明

Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long

Private Declare Function GetDC Lib "user32" (ByVal hWnd As Long) As Long

Private Declare Function GetPixel Lib "gdi32" (ByVal hDC As Long, ByVal x As Long, ByVal y As Long) As Long

'测试颜色函数,给定屏幕任意找色区域值,返回坐标位置

Private Function ifColor(x As RECT, ByVal color As Long) As POINTAPI

On Error Resume Next

Dim nTmpColor As Long, i As Long, j As Long

For i = x.Left To x.Left + x.Right

For j = x.Top To x.Top + x.Bottom

nTmpColor = GetPixel(GetDC(0), i, j)

If color = nTmpColor Then

ifColor.x = i

ifColor.y = j

Exit Function

End If

DoEvents

Next

Next

End Function

Private Sub Command1_Click() '全屏幕找色，时间花费较长

Dim t As POINTAPI, m As RECT

With m

.Top = 0

.Left = 0

.Bottom = Screen.Height / Screen.TwipsPerPixelY

.Right = Screen.Width / Screen.TwipsPerPixelX

End With

t = ifColor(m, 1447073)

Debug.Print t.x, t.y

End Sub

Private Sub Command2_Click() '某区域找色，时间花费少

Dim t As POINTAPI, m As RECT

With m

.Top = 300

.Left = 300

.Bottom = 100

.Right = 100

End With

t = ifColor(m, RGB(0, 125, 125))

Debug.Print t.x, t.y

End Sub

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

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