Luis, Find attached file which contains my code.
The methods that may help are: getImageByMapAgent() getImageUsingRenderService() The first method basically constructs a request to the cgi - I was playing around with dpi and display width and height to get the quality of image i wanted - I seem to remember 'loosing' data when i tried to produce a large image (for example I would try to create a large image using parcel boundary data and aerial photography and the rasters would not appear in the output - note the GetImageFromURL() method has code included to timeout (when producing a large image then you may want to comment this out). In the second method I had to use a round about way to get the extent of the map, i also tried to preserve selection in the map - if i remember correctly the RenderMap() method is overloaded and I tried a number of versions but wasn't quite getting the results i wanted which i why i looked at the direct route to MapAgent. Hope this helps S http://www.nabble.com/file/p14604759/OutputImage.aspx.cs OutputImage.aspx.cs lmbap wrote: > > I'm trying to use your code and the problem with the rendering service is > that the image is created empty. > With the size of the map displyed but without any contents inside. > Can you, as you said, look again to see what is happening? > ty > Luis > > > > simon hope wrote: >> >> Scott, >> >> I was looking at creating PDF's a couple of months back and I used a >> couple of methods - both the rendering service and the direct call to >> mapagent via http - i ended up using the direct call to mapagent as my >> preferred method - here is some sample code that i used (c#) >> >> Method 1 - rendering service >> >> //method for getting extent >> int dpi = map.GetDisplayDpi(); >> double metPerUnit = 100000; >> double metPerPxl = 0.0254 / dpi; >> double sesMapScale = map.GetViewScale(); >> int sesScrnW = map.GetDisplayWidth(); >> int sesScrnH = map.GetDisplayHeight(); >> double midX = map.GetViewCenter().GetCoordinate().GetX(); >> double midY = map.GetViewCenter().GetCoordinate().GetY(); >> >> double sesLLX = midX - ((sesMapScale * sesScrnW * metPerPxl) / >> metPerUnit) / 2; >> double sesURX = ((sesMapScale * sesScrnW * metPerPxl) / >> metPerUnit) / 2 + midX; >> double sesLLY = midY - ((sesMapScale * sesScrnH * metPerPxl) / >> metPerUnit) / 2; >> double sesURY = ((sesMapScale * sesScrnH * metPerPxl) / >> metPerUnit) / 2 + midY; >> >> >> //get the map envelope >> MgEnvelope env = new MgEnvelope(sesLLX, sesLLY, sesURX, sesURY); >> >> //set the selection >> MgSelection sel = new MgSelection(map); >> >> //set the rendering service >> MgRenderingService renderingSrvc = >> siteConnection.CreateService(MgServiceType.RenderingService) as >> MgRenderingService; >> >> //set the colour >> MgColor bgcolor = new MgColor(0, 0, 0, 0); >> >> MgByteReader byteReader = renderingSrvc.RenderMap(map, sel, env, >> sesScrnW, sesScrnH, bgcolor, "png"); >> MgGeometryFactory gFactory = new MgGeometryFactory(); >> MgCoordinate coord = >> gFactory.CreateCoordinateXY(map.GetViewCenter().GetCoordinate().GetX(), >> map.GetViewCenter().GetCoordinate().GetY()); >> >> long byteReaderSize = byteReader.GetLength(); >> //Create an MgByteSink and save to the file system >> MgByteSink byteSink = new MgByteSink(byteReader); >> string fileName = "c:\\temp\\RenderMap.png"; >> byteSink.ToFile(fileName); >> >> Method 2 - http request >> >> call..... >> >> System.Drawing.Image bmp = >> GetImageFromURL("http://localhost/mapguide/mapagent/mapagent.fcgi?OPERATION=GETMAPIMAGE&VERSION=1.0.0&SESSION="; >> + tbSessionID.Text + "&MAPNAME=" + tbMapName.Text + "&LOCALE=en&FORMAT=" >> + format + "&SETVIEWCENTERX=" + Convert.ToString(x) + "&SETVIEWCENTERY=" >> + Convert.ToString(y) + "&SETVIEWSCALE=" + Convert.ToString(scale) + >> "&SETDISPLAYDPI=" + strDpi + "&SETDISPLAYWIDTH=" + dispW + >> "&SETDISPLAYHEIGHT=" + dispH); >> >> method.... >> >> private System.Drawing.Image GetImageFromURL(string strURL) >> { >> >> System.Drawing.Image retVal = null; >> >> try >> { >> >> HttpWebRequest request = >> (HttpWebRequest)HttpWebRequest.Create(strURL); >> //request.Timeout = 15000; // 5 seconds in milliseconds >> //request.ReadWriteTimeout = 20000; // allow up to 20 >> seconds to elapse >> >> // execute the request >> HttpWebResponse response = >> (HttpWebResponse)request.GetResponse(); >> retVal = >> System.Drawing.Image.FromStream(response.GetResponseStream()); >> >> } >> >> catch (Exception) >> { >> retVal = null; >> } >> return retVal; >> >> } >> >> I can't remember quite where i was experiencing problems with the >> rendering service but could looki again if you need more help >> >> Cheers >> >> Simon >> >> >> >> Kenneth, GEOGRAF A/S wrote: >>> >>> I see your point. >>> The runtime map has a DisplayDPI property, but it is readonly. >>> I also assumed that the API had the same parameters as the actual >>> service call, but not in this case. >>> You can use the "SETDATAEXTENT" call to set the DPI, but it does change >>> current DPI. >>> >>> You should be able to save a copy of the runtime map though. >>> >>> Regards, Kenneth, GEOGRAF A/S >>> >>> >>> >>> Scott Hameister skrev: >>>> >>>> That is true...But that is using an FCGI call and not the Rendering >>>> Service API...The API has no mention of DPI...I would think the API >>>> would have all the same capabilities that an FCGI call has? >>>> >>>> >>>> >>>> I started using the FCGI calls...but it became annoying because >>>> changing the FCGI DPI...caused the Current maps DPI to change... >>>> >>>> If I created a new Session to call the FCGI on, then my selection XML >>>> from the original Sessions map didn't work in the New Session, because >>>> the Layer ID changed...etc. >>>> >>>> >>>> >>>> *From:* [EMAIL PROTECTED] >>>> [mailto:[EMAIL PROTECTED] *On Behalf Of >>>> *Kenneth, GEOGRAF A/S >>>> *Sent:* Monday, November 12, 2007 1:21 PM >>>> *To:* MapGuide Users Mail List >>>> *Subject:* Re: [mapguide-users] RenderingService and DPI (How to >>>> change DPI before rendering) >>>> >>>> >>>> >>>> I have no used the ColdFusion stuff that you are using, but the call >>>> to GetMapImage does have a DPI parameter, that you can use. >>>> I have no trouble getting the images as I want, although the PDF >>>> format usually reduces quality a bit. >>>> >>>> Try looking at the code in the viewer for "Printable Page", as it >>>> shows how to use the calls. >>>> >>>> >>>> Regards, Kenneth, GEOGRAF A/S >>>> >>>> >>>> >>>> Scott Hameister skrev: >>>> >>>> I can send anyone interested sample PDFs of the same map stream at >>>> different screen resolutions >>>> >>>> >>>> >>>> *From:* [EMAIL PROTECTED] >>>> <mailto:[EMAIL PROTECTED]> >>>> [mailto:[EMAIL PROTECTED] *On Behalf Of *Scott >>>> Hameister >>>> *Sent:* Monday, November 12, 2007 12:00 PM >>>> *To:* 'MapGuide Users Mail List' >>>> *Subject:* [mapguide-users] RenderingService and DPI (How to change >>>> DPI before rendering) >>>> >>>> >>>> >>>> How do I change the DPI that The Rendering Service Uses when Creating >>>> a map... >>>> >>>> The Streamed Image from the rendering service is being poured into a >>>> PDF file...the problem is that the quality of the PDF varies based on >>>> the Resolution my Screen is at when I render the Stream, instead of >>>> being consistent in the PDF. If I'm at 1024 x 768 the PDF map is >>>> grainier than if I'm at 1920x1200 resolution when I stream the image >>>> How can I address this to make the PDF quality the same for all users? >>>> >>>> >>>> >>>> <cfset newMap = >>>> renderingSrvc.rendermap(map,mgselection,realCenter,Javacast("DOUBLE",SesMapScale),Javacast >>>> >>>> ("INT",SesScrnW),Javacast("INT",SesScrnH),mapcolor,"PNG")> >>>> >>>> >>>> >>>> Above Is my Coldfusion call... >>>> >>>> >>>> >>>> >>>> ------------------------------------------------------------------------ >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> mapguide-users mailing list >>>> [email protected] <mailto:[email protected]> >>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users >>>> >>>> ------------------------------------------------------------------------ >>>> >>>> _______________________________________________ >>>> mapguide-users mailing list >>>> [email protected] >>>> http://lists.osgeo.org/mailman/listinfo/mapguide-users >>>> >>> >>> _______________________________________________ >>> mapguide-users mailing list >>> [email protected] >>> http://lists.osgeo.org/mailman/listinfo/mapguide-users >>> >>> >> >> > > -- View this message in context: http://www.nabble.com/RenderingService-and-DPI-%28How-to-change-DPI-before-rendering%29-tp13710681s16610p14604759.html Sent from the MapGuide Users mailing list archive at Nabble.com. _______________________________________________ mapguide-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapguide-users
