Я не уверен, что вы подразумеваете под
увеличения и уменьшения изображения без кнопок исчезающие
Но вы можете использовать этот элемент управления, созданный Боб Пауэлл. Его сайт сейчас отключен, но я нашел этот код:
Imports System
Imports System.Collections
Imports System.ComponentModel
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Namespace bobpowell.net
'/ <summary>
'/ ZoomPicBox does what it says on the wrapper.
'/ </summary>
'/ <remarks>
'/ PictureBox doesn't lend itself well to overriding. Why not start with something basic and do the job properly?
'/ </remarks>
Public Class ZoomPicBox
Inherits ScrollableControl
Private _image As Image
<Category("Appearance"), Description("The image to be displayed")> _
Public Property Image() As Image
Get
Return _image
End Get
Set
_image = value
UpdateScaleFactor()
Invalidate()
End Set
End Property
Private _zoom As Single = 1F
<Category("Appearance"), Description("The zoom factor. Less than 1 to reduce. More than 1 to magnify.")> _
Public Property Zoom() As Single
Get
Return _zoom
End Get
Set
If value < 0 OrElse value < 1E-05 Then
value = 1E-05F
End If
_zoom = value
UpdateScaleFactor()
Invalidate()
End Set
End Property
Private Sub UpdateScaleFactor()
If _image Is Nothing Then
Me.AutoScrollMargin = Me.Size
Else
Me.AutoScrollMinSize = New Size(CInt(Me._image.Width * _zoom + 0.5F), CInt(Me._image.Height * _zoom + 0.5F))
End If
End Sub 'UpdateScaleFactor
Private _interpolationMode As InterpolationMode = InterpolationMode.High
<Category("Appearance"), Description("The interpolation mode used to smooth the drawing")> _
Public Property InterpolationMode() As InterpolationMode
Get
Return _interpolationMode
End Get
Set
_interpolationMode = value
End Set
End Property
Protected Overrides Sub OnPaintBackground(pevent As PaintEventArgs)
End Sub 'OnPaintBackground
' do nothing.
Protected Overrides Sub OnPaint(e As PaintEventArgs)
'if no image, don't bother
If _image Is Nothing Then
MyBase.OnPaintBackground(e)
Return
End If
'Set up a zoom matrix
Dim mx As New Matrix(_zoom, 0, 0, _zoom, 0, 0)
mx.Translate(Me.AutoScrollPosition.X/_zoom, Me.AutoScrollPosition.Y/_zoom)
e.Graphics.Transform = mx
e.Graphics.InterpolationMode = _interpolationMode
e.Graphics.DrawImage(_image, New Rectangle(0, 0, Me._image.Width, Me._image.Height), 0, 0, _image.Width, _image.Height, GraphicsUnit.Pixel)
MyBase.OnPaint(e)
End Sub 'OnPaint
Public Sub New()
'Double buffer the control
Me.SetStyle(ControlStyles.AllPaintingInWmPaint Or ControlStyles.UserPaint Or ControlStyles.ResizeRedraw Or ControlStyles.UserPaint Or ControlStyles.DoubleBuffer, True)
Me.AutoScroll = True
End Sub 'New
End Class 'ZoomPicBox
End Namespace 'bobpowell.net