给图片添加版权信息

fan0217 · 发表于 2008-3-9 22:33:08

Public Sub AddTextToImg(ByVal file As String, ByVal newFile As String, ByVal text As String)
If Not System.IO.File.Exists(file) Then
Throw New System.IO.FileNotFoundException("文件不存在。")
End If
If text = String.Empty Then
Return
End If
'还需要判断文件类型是否为图像类型，这里就不赘述了
Dim image As System.Drawing.Image = System.Drawing.Image.FromFile(file)
Dim bitmap As New System.Drawing.Bitmap(image, image.Width, image.Height)
Dim g As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(bitmap)
Dim fontSize As Single = 12.0F '字体大小
Dim textWidth As Single = text.Length * fontSize '文本的长度
'下面定义一个矩形区域，以后在这个矩形里画上白底黑字
Dim rectX As Single = 0
Dim rectY As Single = 0
Dim rectWidth As Single = text.Length * (fontSize + 8)
Dim rectHeight As Single = fontSize + 8
'声明矩形域
Dim textArea As New System.Drawing.RectangleF(rectX, rectY, rectWidth, rectHeight)
Dim font As New System.Drawing.Font("宋体", fontSize) '定义字体
Dim whiteBrush As New System.Drawing.SolidBrush(Color.White) '白笔刷，画文字用
Dim blackBrush As New System.Drawing.SolidBrush(Color.Black) '黑笔刷，画背景用
g.FillRectangle(blackBrush, rectX, rectY, rectWidth, rectHeight)
g.DrawString(text, font, whiteBrush, textArea)
'保存为Jpg类型
bitmap.Save(newFile, System.Drawing.Imaging.ImageFormat.Jpeg)
g.Dispose()
bitmap.Dispose()
image.Dispose()
End Sub