vb.net随机取颜色 VB随机颜色

在vb中，字体随机颜色是怎么用代码实现的？

创建一个Time控件、Label1控件，代码如下：

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Private Sub Form_Load()

Timer1.Interval = 500

End Sub

Private Sub Timer1_Timer()

a = Int(Rnd * 256)

b = Int(Rnd * 256)

c = Int(Rnd * 256)

Label1.ForeColor = RGB(a, b, c)

End Sub

就可以实现Label1控件的字体随机颜色变换。

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)

VB怎么随机限定颜色呢（如红黄蓝绿）

写一个函数 如 随机颜色

随机1-4 int(rnd*4) 赋值给一个变量如a

然后 select case a

case 1 红

case 2 黄

case 3 蓝

case 4 绿

把这个函数返回值设置为颜色的 整数形式

最后在你使用的地方，某某.color=随机颜色()

VB如何实现颜色随机选择

Private Sub Form_Click()

Randomize Timer

BackColor = RGB(Rnd * 256, Rnd * 256, Rnd * 256)

End Sub

'这是改变窗体背景颜色的过程代码。

Vb.net2010字体颜色问题?

这个问题的本质就是随机二字，无论c/s还是b/s里面的label1 ，只要随机设置字体颜色属性即可。而相关属性我相信您肯定知道，关键是怎样随机。vb.net里面有一个随机函数，只要利用该随机函数，随机生成相应的颜色即可，然后把随机颜色赋值给label的属性

VB.NET当鼠标停在屏幕任意地方，得到该点的颜色

我有个笨办法，先用API抓图到内存里，然后再在根据你点鼠标的屏幕工作区坐标，去那图里取色。

-----------------------

'抓图所需的API

Private Declare Function CreateCompatibleDC Lib "GDI32" (ByVal hDC As Integer) As Integer

Private Declare Function CreateCompatibleBitmap Lib "GDI32" (ByVal hDC As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer) As Integer

Private Declare Function SelectObject Lib "GDI32" (ByVal hDC As Integer, ByVal hObject As Integer) As Integer

Private Declare Function BitBlt Lib "GDI32" (ByVal srchDC As Integer, ByVal srcX As Integer, ByVal srcY As Integer, ByVal srcW As Integer, ByVal srcH As Integer, ByVal desthDC As Integer, ByVal destX As Integer, ByVal destY As Integer, ByVal op As Integer) As Integer

Private Declare Function DeleteDC Lib "GDI32" (ByVal hDC As Integer) As Integer

Private Declare Function DeleteObject Lib "GDI32" (ByVal hObj As Integer) As Integer

Declare Function GetDC Lib "user32" Alias "GetDC" (ByVal hwnd As Integer) As Integer

Const SRCCOPY As Integer = HCC0020

'抓图的部分

Dim hDC, hMDC As Integer

Dim hBMP, hBMPOld As Integer

Dim sw, sh As Integer

hDC = GetDC(0)

hMDC = CreateCompatibleDC(hDC)

sw = Screen.PrimaryScreen.Bounds.Width

sh = Screen.PrimaryScreen.Bounds.Height

hBMP = CreateCompatibleBitmap(hDC, sw, sh)

hBMPOld = SelectObject(hMDC, hBMP)

BitBlt(hMDC, 0, 0, sw, sh, hDC, 0, 0, SRCCOPY)

hBMP = SelectObject(hMDC, hBMPOld)

Dim bmp As Bitmap = Image.FromHbitmap(New IntPtr(hBMP))

DeleteDC(hDC)

DeleteDC(hMDC)

DeleteObject(hBMP)

......

'取点的颜色

bmp.GetPixel(e.X, e.Y)

----------------------------

关键就是这些你自己组合吧，你分给的太少了，很麻烦，恕我不帮你改全了。如果要仔细帮你改，请另开高分贴，不要用新马甲来

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