vb.net绘制到屏幕 vbs编写图形窗口

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)

VB.net 界面无法出现在屏幕中央

要么在属性栏设置,要么在 new 事件里 写这句代码

load事件无用

Public Sub New()

InitializeComponent()

Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen

End Sub

vb.net桌面中bitmap类如何直接绘制到屏幕?

可以直接显示的。你看下面的示例,使用vb.net画的齿轮:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

b = New Bitmap(PictureBox1.Width, PictureBox1.Height)

g = Graphics.FromImage(b)

'g.RotateTransform(90)

g.Clear(Color.White)

g.TranslateTransform(PictureBox1.Width / 2, PictureBox1.Height / 2)

g.ScaleTransform(1, -1)

'g.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias

g.SmoothingMode = Drawing2D.SmoothingMode.HighQuality

DrawCL(g, New PointF(Val(TextBox1.Text), Val(TextBox2.Text)), Val(TextBox3.Text), Val(TextBox4.Text), Val(TextBox5.Text), Val(TextBox6.Text), Val(TextBox7.Text), Val(TextBox8.Text), Val(TextBox9.Text))

DrawCL(g, New PointF(Val(TextBox18.Text), Val(TextBox17.Text)), Val(TextBox16.Text), Val(TextBox15.Text), Val(TextBox14.Text), Val(TextBox13.Text), Val(TextBox12.Text), Val(TextBox11.Text), Val(TextBox10.Text))

PictureBox1.Image = b

End Sub

VB.NET怎么在屏幕上画一个逐渐变大的空心圈?

在窗体上拉一个Timer控件,enabled设为true,Interval设为20。完整代码如下: Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)

Dim formGraphics As System.Drawing.Graphics

Dim num As Integer = 1

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

Me.Refresh() '清屏

formGraphics = Me.CreateGraphics()

formGraphics.DrawEllipse(myPen, New Rectangle(100, 100, num, num)) '在坐标(100,100)的位置画圆

If num 200 Then '如果大于200则停止画圆

myPen.Dispose()

formGraphics.Dispose()

Timer1.Enabled = False

Else

num = num + 1

End If

End Sub


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