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一个VB.NET写的简单图片缩放处理组件源代码,支持添加半透明效果小图标

王朝c#·作者佚名  2006-12-17
窄屏简体版  字體: |||超大  

VB.NET写的一个图片处理组件,用于在ASP中处理图片,缩放图片,成比例缩放,有固定比例背景的缩放,加半透明LOGO小图标等功能.

dImage.vb

Imports System

Imports System.Drawing

<ComClass(dImage.ClassId, dImage.InterfaceId, dImage.EventsId)> _

Public Class dImage

#Region "COM GUIDs"

' 这些 GUID 提供该类的 COM 标识及其 COM 接口。

' 如果您更改它们,现有的客户端将再也无法

' 访问该类。

Public Const ClassId As String = "29641F37-8FA4-4ED9-9118-9DA8EFA306B9"

Public Const InterfaceId As String = "06E4B037-2461-4F83-96BE-2A5D1CAAB0CE"

Public Const EventsId As String = "802EBB14-2D4D-416E-BA26-E8ADCD480E26"

#End Region

' 可创建的 COM 类必须具有不带参数的

' Public Sub New(),否则,该类将不会注册到 COM 注册表中,

' 而且不能通过 CreateObject

' 来创建。

Private myImage As Drawing.Bitmap

Private syimg As Drawing.Bitmap

Private syok As Boolean = False

Private myok As Boolean = False

Public Sub New()

MyBase.New()

End Sub

Public WriteOnly Property bigImage() As String

Set(ByVal Value As String)

Try

myImage = New Bitmap(Value)

myok = True

Catch e As IO.IOException

myok = False

End Try

End Set

End Property

Public WriteOnly Property LogoImage() As String

Set(ByVal Value As String)

Try

syimg = New Bitmap(Value)

syok = True

Catch ex As Exception

syok = False

End Try

End Set

End Property

Public Function SaveAs(ByVal ToFile As String, ByVal nWidth As Integer, ByVal nHeight As Integer, ByVal nLogo As Boolean) As String

Try

If myok = False Then

Return "err0"

Exit Function

End If

Dim newbmp As Bitmap = New Bitmap(nWidth, nHeight, Imaging.PixelFormat.Format16bppArgb1555)

Dim iX As Integer

Dim iY As Integer

Dim xMax As Integer

Dim yMax As Integer

For iX = 0 To nWidth - 1

For iY = 0 To nHeight - 1

newbmp.SetPixel(iX, iY, Color.White)

Next

Next

If nWidth < myImage.Width Or nHeight < myImage.Height Then

If myImage.Width / myImage.Height > nWidth / nHeight Then

xMax = nWidth

yMax = myImage.Height * nWidth \ myImage.Width

Else

yMax = nHeight

xMax = myImage.Width * nHeight \ myImage.Height

End If

Else

xMax = myImage.Width

yMax = myImage.Height

End If

Dim tembmp As Bitmap = New Bitmap(myImage, xMax, yMax)

xMax = (newbmp.Width - tembmp.Width) \ 2

yMax = (newbmp.Height - tembmp.Height) \ 2

For iX = 0 To tembmp.Width - 1

For iY = 0 To tembmp.Height - 1

newbmp.SetPixel(iX + xMax, iY + yMax, tembmp.GetPixel(iX, iY))

Next

Next

If syok And nLogo Then

Dim cob As Color

Dim coc As Color

xMax = newbmp.Width - syimg.Width - 4

yMax = newbmp.Height - syimg.Height - 3

For iX = 0 To syimg.Width - 1

For iY = 0 To syimg.Height - 1

cob = syimg.GetPixel(iX, iY)

coc = newbmp.GetPixel(iX + xMax, iY + yMax)

newbmp.SetPixel(iX + xMax, iY + yMax, getnewco(cob, coc))

Next

Next

End If

newbmp.Save(ToFile, Imaging.ImageFormat.Jpeg)

newbmp.Dispose()

tembmp.Dispose()

newbmp = Nothing

tembmp = Nothing

Return "OK"

Catch ex As Exception

Return ex.ToString

End Try

End Function

Public ReadOnly Property Width() As Integer

Get

Return myImage.Width

End Get

End Property

Public ReadOnly Property Height() As Integer

Get

Return myImage.Height

End Get

End Property

Public Sub Close()

myImage.Dispose()

syimg.Dispose()

myImage = Nothing

syimg = Nothing

End Sub

Private Function getnewco(ByVal c1 As Color, ByVal c2 As Color) As Color

Dim a1 As Integer = c1.A

Dim r1 As Integer = c1.R

Dim g1 As Integer = c1.G

Dim b1 As Integer = c1.B

Dim a2 As Integer = c2.A

Dim r2 As Integer = c2.R

Dim g2 As Integer = c2.G

Dim b2 As Integer = c2.B

a2 = 255 - a1

r1 = CInt((r1 * a1 / 255) + (r2 * a2 / 255))

g1 = CInt((g1 * a1 / 255) + (g2 * a2 / 255))

b1 = CInt((b1 * a1 / 255) + (b2 * a2 / 255))

Return Color.FromArgb(a1, r1, g1, b1)

End Function

End Class

 
 
 
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