view-textgraphic.asmx
<%@ WebService Language="vb" Class="TextGraphic" %>
2
3 Imports System
4 Imports System.Web.Services
5 Imports System.IO
6 Imports System.Drawing
7 Imports System.Drawing.Imaging
8 Imports System.Drawing.Drawing2D
9
10
11 <WebService(Namespace:="http://www.ASPalliance.com/chrisg/services")> _
12 Public Class TextGraphic
13
14
15 <WebMethod> Public Function DrawText( _
16 text as String, _
17 fontName as String, _
18 fontSize as Integer, _
19 fontColor as String, _
20 alignment as String, _
21 backcolor as String, _
22 width as Integer, _
23 height as Integer _
24 ) as Byte()
25
26 ' create output stream
27 dim outStream as System.IO.MemoryStream
28 outStream = New System.IO.MemoryStream()
29
30
31 ' create a New bitmap image
32 dim b as Bitmap = New Bitmap(width, height, pixelformat.format24bpprgb)
33 dim g as Graphics
34 g = Graphics.FromImage(b)
35 dim fBrush as SolidBrush
36 fBrush = New SolidBrush(ColorTranslator.FromHTML(fontColor))
37
38 dim salign as New StringFormat
39 dim coords as pointF
40
41 if alignment.ToUpper = "LEFT" then
42 salign.alignment = stringalignment.near
43 coords = New pointF(0,0)
44 elseif alignment.ToUpper = "RIGHT" then
45 salign.alignment = stringalignment.far
46 coords = New pointF(0,0)
47 else
48 salign.alignment = stringalignment.center
49 coords = New pointF(width/2,0)
50 end if
51
52 ' blank the bitmap
53 g.Clear(ColorTranslator.FromHTML(backcolor))
54
55 ' antialias
56 g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias
57 g.smoothingMode = smoothingMode.antiAlias
58
59 g.drawString(text, New font(fontName,fontSize),fBrush,coords,salign)
60
61
62 ' serve the image to the client
63 b.Save(outStream, ImageFormat.Gif)
64
65 return outStream.ToArray()
66
67 ' clear up
68 b.Dispose()
69 g.Dispose()
70
71
72
73 End Function
74
75 End Class
testtextgraphic.ASPx
<%@ Page Language="vb" Debug="True" %>
2 <%@ import namespace="System.Drawing" %>
3 <%@ import namespace="System.IO" %>
4 <%
5
6 ' initialise objects
7 dim gText as New TextGraphic
8 dim b as Bitmap
9 dim bytes as Byte()
10 dim inStream as System.IO.MemoryStream
11
12 ' get image data
13 bytes = gText.DrawText("test2","tahoma",36, "#0000ff", "center", "#ffffff", 100,100)
14 inStream = New System.IO.MemoryStream(bytes)
15
16 ' create a New image from stream
17 b = New Bitmap(inStream)
18
19 ' Set the content type
20 response.contenttype="image/gif"
21
22 ' send the image to the viewer
23 b.save(response.outputstream, b.rawformat)
24
25 ' tidy up
26 b.dispose()
27
28 %>
