vb.net如何实现确定两点位置以后,用一条直线自动连接二点 。求大神指导 。。dim myGraphics as new
System.Drawing .Graphics
Dim myStartPoint As New Point(4, 2)
Dim myEndPoint As New Point(12, 6)
myGraphics.DrawLine(myPen, myStartPoint, myEndPoint)
VB.net 中如何判断一个圆和一个矩形相交建立新窗体,新建timer控件,间隔随意,运行即可,输入以下代码,可以充分看到你要的效果
Dim yuanxin As New Point(50, 50) '圆心
Dim zhijing As Long = 100 '直径,其实里面用的多的是半径,但你说是直径,我就用直径
【vb.net两线相交 visio2010两线相交凸起】Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles Me.Paint
e.Graphics.Clear(Color.Beige) '刷除底色
Dim myRect As New RectangleF(150, 80, 100, 100) '建立矩形
e.Graphics.DrawRectangle(Pens.Red, Rectangle.Round(myRect)) '画出矩形
Dim p As System.Drawing.Drawing2D.GraphicsPath = New System.Drawing.Drawing2D.GraphicsPath() '新建路径
p.AddEllipse(yuanxin.X - zhijing \ 2, yuanxin.Y - zhijing \ 2, zhijing, zhijing) '向当前路径增加椭圆,里面的运算是把圆心转换为圆形外切矩形的左上角坐标以及这个矩形的宽和高,在本例中宽高即为圆形的直径
e.Graphics.DrawPath(Pens.Black, p) '在窗体上画出椭圆(本例中是圆形)
Dim myRegion As New [Region](p) '根据椭圆建立区域
Dim contained As Boolean = myRegion.IsVisible(myRect) '判断区域是否相交
Dim myFont As New Font("Arial", 8)
Dim myBrush As New SolidBrush(Color.Black)
e.Graphics.DrawString("相交 = "contained.ToString(), myFont, myBrush, New PointF(20, 260)) '输出结果
End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
yuanxin.X= 1
Me.Refresh()
End Sub
VB.NET我要用鼠标轨迹画一个矩形框 然后选中控件 。就像星际和魔兽争霸里对部队单位的选中一样~等大神回答这个类继承自Panel , 把它加到你的项目里面,先运行一下 , 然后从工具箱里把它拖到窗体上,然后再向里面添加其它控件就可以了,支持Shift加选,Alt减选
Imports System.Linq
Imports System.Collections
Public Class MyPanel
Inherits Panel
' 选择模式,相交还是包含
Enum SelectMode
Intersects
Contains
End Enum
Dim down As New Point(-1, -1)
Dim rect As Rectangle
Dim selected As New List(Of Control)
Dim editting As IEnumerable(Of Control)
Dim mode As SelectMode = SelectMode.Contains
Dim shift, alt As Boolean
Public Sub New()
Me.DoubleBuffered = True
End Sub
Protected Overrides Sub OnMouseDown(e As MouseEventArgs)
MyBase.OnMouseDown(e)
down = e.Location
editting = selected.ToArray().ToList()
OnMouseMove(e)
End Sub
Protected Overrides Sub OnMouseMove(e As MouseEventArgs)
MyBase.OnMouseMove(e)
If e.Button = Windows.Forms.MouseButtons.Left Then
Dim loc As New Point(Math.Min(down.X, e.X), Math.Min(down.Y, e.Y))
Dim size As New Size(Math.Abs(down.X - e.X), Math.Abs(down.Y - e.Y))
rect = New Rectangle(loc, size)
Dim cs As New List(Of Control)
For Each c In Controls
cs.Add(c)
Next
Dim a = cs.Where(Function(n As Control) (mode = SelectMode.Contains And rect.Contains(n.Bounds)) Or (mode = SelectMode.Intersects And rect.IntersectsWith(n.Bounds)))
If shift Then editting = a.Union(selected) Else If alt Then editting = selected.Except(a) Else editting = a
Invalidate()
End If
End Sub
Protected Overrides Sub OnMouseUp(e As MouseEventArgs)
MyBase.OnMouseUp(e)
down = New Point(-1, -1)
selected = editting.ToList()
editting = Nothing
Invalidate()
End Sub
Protected Overrides Function ProcessKeyPreview(ByRef m As Message) As Boolean
Dim KeyCode As Keys = CInt(m.WParam) And CInt(Keys.KeyCode)
Dim d As Boolean
If m.Msg = H100 Or m.Msg = H104 Then d = True Else If m.Msg = H101 Or m.Msg = H105 Then d = False Else Return MyBase.ProcessKeyPreview(m)
If KeyCode = Keys.ShiftKey Then
shift = d
ElseIf KeyCode = Keys.Menu Then
alt = d
End If
Return MyBase.ProcessKeyPreview(m)
End Function
Protected Overrides Sub OnPaint(e As PaintEventArgs)
MyBase.OnPaint(e)
For Each c As Control In IIf(editting Is Nothing, selected, editting)
e.Graphics.DrawRectangle(New Pen(Color.Gray) With {.DashStyle = Drawing2D.DashStyle.DashDot}, c.Left - 1, c.Top - 1, c.Width1, c.Height1)
Next
If (down.X0) Then e.Graphics.DrawRectangle(New Pen(Color.Gray) With {.DashStyle = Drawing2D.DashStyle.DashDot}, rect)
End Sub
End Class
vb.net怎么画不同坐标的八叉直线[{"word":"VB.NET画直线方法\n该方法绘制一条连接由坐标对指定的两个点的线条,所以我们需要指定这两个点的坐标,如下所示、\nDrawL in e(pen,x1.y1,x2,y2)或者DrawL in e(pen,Po in t1,Poin t2)\n下面示例将在PictureBox控件表面绘制一条直线、\nDim g As\nGraphics=Me.PictureBox\n1.CreateGraphics\nDim mpen As New\nPen(Color.Red)g.DrawLin e(mpen,0,80,0,160)\n也可以使用如下代码来实现一样的甲\n__\n"}]
vb.net使用如密狗加密狗怎么使用,分为以下几个步骤 。
1、做加密软件之前先安装好客户端CodeMeterSDK 。打开客户端,进入CodeMeter功能导航界面 。
2、打开AxProtector自动加密工具 。打开加密工具界面后,选择您要加密的程序类型 , 根据开发者软件的特点进行选择 。
VB与VB.NET串口及以太网通迅关于串口通讯的问题vb.net两线相交:
很明显vb.net两线相交,你还不知道(不会、不习惯)使用事件驱动的方式接收数据 。
建议你仔细看看串口组件(无论VB6还是VB.net)的OnComm事件vb.net两线相交 , 你的问题很容易解决 。
关于以太网通讯vb.net两线相交:
在TCP通讯中端口确实可以重用vb.net两线相交 , 你百度一下“TCP端口重用”能查到很多示例 。
但绝大多数情况下不推荐端口重用 , 而应该采取服务器端建立连接池的方法 。
或者,干脆不用TCP , 用UDP解决也可以 。
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