vb.net怎么画点,vb画点用什么方法

vb.net 怎么在屏幕打点

画点：

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在PictureBox的Paint事件里面：

dim myGraphics=e.Graphics

Dim myPointArray As Point() = {New Point(0, 0), New Point(50, 30), New Point(30, 60)}

myGraphics.DrawPolygon(myPen, myPointArray)

画圆：

Dim g As Graphics

g = PictureBox1.CreateGraphics

g.FillEllipse(Brushes.Red, x, y, 10, 10)

求问VB.NET中（注不是VB6.0)没有画点吗，急！！求高手帮忙

Dim b As New Bitmap(320, 200)'定义图像宽高

Dim clrs As Color=Color.Black

for y as int32=1 to 199

for x as int32=1 to 319

if x=y then

clrs = Color.White'假设是对角线，x=y时使用白色

else

clrs = Color.Black'平时使用黑色

endif

b.SetPixel(x, y, clrs)'画点

next

next

b.Save("test.tif", System.Drawing.Imaging.ImageFormat.Tiff)'保存到图片文件

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原创例子，祝进步！！

vb.net里如何画点？请写出代码。

Call Pset(x,y,RGB(Red,Green,Blue))

x,y是坐标

RGB是颜色

可以随时调用!!!

哦，对不起，没看清。

我没用过VB.Net，代码是没办法给你了

但我有办法：

用API函数SetPixel，SetPixelv(后者快一点)

语法参见

vb.net 真的没法画点吗？

.NET确实没有提供画一个像素点得方法

你可以试一下用FillEllipse填充一个宽1像素，高2像素的椭圆

原理就是FillEllipse的时候，最左边那一列一般都会多出一个一像素的点；高至少要2，少了就什么都画不出来

怎样在VB.net中画一个点呢？

画点：

在PictureBox的Paint事件里面：

dim myGraphics=e.Graphics

Dim myPointArray As Point() = {New Point(0, 0), New Point(50, 30), New Point(30, 60)}

myGraphics.DrawPolygon(myPen, myPointArray)

画圆：

Dim g As Graphics

g = PictureBox1.CreateGraphics

g.FillEllipse(Brushes.Red, x, y, 10, 10)

VB画点和直线

先在桌面新建一个文本文档，输入20个点坐标

Dim x As Integer

Dim y As Integer

Dim z As Single

Dim i As Integer

Private Sub Command1_Click()

Form1.Picture1.Scale (0, 0)-(100, 100)

Open "c:\1.txt" For Input As #1

i = 0

Do While Not EOF(1)

i = i + 1

Input #1, x(i), y(i), z(i)

Form1.Picture1.PSet (x(i), y(i))

Loop

Close #1

End Sub

Private Sub Command2_Click()

For n = 1 To i - 1

For j = n + 1 To i - 1

If x(n) x(j) Then

t = x(n)

x(n) = x(j)

x(j) = t

k = y(n)

y(n) = y(j)

y(j) = k

End If

Next j

Next n

For n = 1 To i - 2

Form1.Picture1.Line (x(n), y(n))-(x(n + 1), y(n + 1))

Next n

End Sub

Private Sub Command3_Click()

Form1.Picture2.Scale (0, 0)-(100, 100)

Open "c:\1.txt" For Input As #1

i = 1

Do While Not EOF(1)

Input #1, x(i), y(i), z(i)

Form1.Picture2.PSet (x(i), y(i))

i = i + 1

Loop

Close #1

End Sub

Private Sub Command4_Click()

For n = 1 To i - 1

Form1.Picture2.Line (x(n) - z(n), y(n))-(x(n) + z(n), y(n))

Form1.Picture2.Line (x(n), y(n) + z(n))-(x(n), y(n) - z(n))

Next n

End Sub