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使用Line方法，向Form，PictureBox这些控件都支持这个方法。
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语法:
object.Line [Step] (x1, 1) [Step] (x2, y2), [color], [B][F]
如：
Me.Line (100,100)-(600,600), vbred, bf
加B这个参数就是矩形，加F就是用就边框颜色填充
补充：
Color参数就是边框颜色，如果省略，就用对象的ForeColor（前景色，就是字体的颜色） 属性值
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.Width + 1, c.Height + 1)
Next
If (down.X 0) Then e.Graphics.DrawRectangle(New Pen(Color.Gray) With {.DashStyle = Drawing2D.DashStyle.DashDot}, rect)
End Sub
End Class
g = Me.picDisplay.CreateGraphics
Dim mybrush As Brush = New SolidBrush(Map_Empty_Color)
Dim rect2 As System.Drawing.Rectangle = New System.Drawing.Rectangle(0, 0, Map_Width, Map_Height)
g.FillRectangle(mybrush, rect2)
Dim canvas As New ShapeContainer
' To draw anoval, substitute
' OvalShapefor RectangleShape.
DimtheShape As NewRectangleShape
' Set theform as the parent of the ShapeContainer.
canvas.Parent = Me
' Set theShapeContainer as the parent of the Shape.
theShape.Parent = canvas
' Set thesize of the shape.
theShape.Size = New System.Drawing.Size(200,300)
' Set thelocation of the shape.
theShape.Location = New System.Drawing.Point(100,100)
' To draw arounded rectangle, add the following code:
theShape.CornerRadius = 12
theShape.FillStyle = FillStyle.Solid
theShape.FillColor = Color.Red
使用Line 方法
在对象上画直线和矩形。
语法
object.Line [Step] (x1, 1) [Step] (x2, y2), [color], [B][F]
Line 方法的语法有以下对象限定符和部分：
部分 描述
object 可选的。 对象表达式，其值为“应用于”列表中的对象。如果object 省略，具有焦点的窗体作为object。
Step 可选的。关键字，指定起点坐标，它们相对于由 CurrentX 和 CurrentY 属性提供的当前图形位置。
(x1, y1) 可选的。Single （单精度浮点数），直线或矩形的起点坐标。ScaleMode 属性决定了使用的度量单位。如果省略，线起始于由 CurrentX 和 CurrentY 指示的位置。
Step 可选的。关键字，指定相对于线的起点的终点坐标。
(x2, y2) 必需的。Single （单精度浮点数），直线或矩形的终点坐标。
color 可选的。Long （长整型数），画线时用的 RGB 颜色。如果它被省略，则使用 ForeColor 属性值。可用 RGB 函数或 QBColor 函数指定颜色。
B 可选的。如果包括，则利用对角坐标画出矩形。
F 可选的。如果使用了 B 选项，则 F 选项规定矩形以矩形边框的颜色填充。不能不用 B 而用 F。如果不用 F 光用 B，则矩形用当前的 FillColor 和 FillStyle 填充。FillStyle 的缺省值为 transparent。
例：
Private Sub Form_Load()
Me.AutoRedraw = True
Line (100, 100)-(2100, 2100), vbBlue, BF
End Sub