/[thuban]/branches/WIP-pyshapelib-bramz/Extensions/wms/wms.py
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revision 2171 by joey, Tue Apr 13 17:31:01 2004 UTC revision 2203 by jan, Tue May 11 22:34:49 2004 UTC
# Line 13  It just demonstrates how to add a specia Line 13  It just demonstrates how to add a specia
13  layer into Thuban via an extension.  layer into Thuban via an extension.
14  Some things are not wired, so be prepared for Exceptions  Some things are not wired, so be prepared for Exceptions
15  everywhere.  everywhere.
   
 You will need PyOGCLib 0.1.0, see  
   http://pyogclib.sourceforge.net/  
 Set the PYTHONPATH to the PyOGCLib directory before  
 starting Thuban.  
16  """  """
17    
18  __version__ = "$Revision$"  __version__ = "$Revision$"
19    # $Source$
20    # $Id$
21    
22  import os, sys  import os, sys
23  import xml.dom.minidom  import xml.dom.minidom
# Line 28  import tempfile Line 25  import tempfile
25    
26  from wxPython.wx import *  from wxPython.wx import *
27    
 from ogclib.WMSClient import WMSClient  
   
 from Thuban.Model.layer import BaseLayer  
28  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
29  from Thuban.Model.extension import Extension  from Thuban.Model.extension import Extension
 from Thuban.Model.resource import get_system_proj_file, EPSG_PROJ_FILE, \  
      EPSG_DEPRECATED_PROJ_FILE  
30  from Thuban.UI.command import registry, Command  from Thuban.UI.command import registry, Command
31  import Thuban.UI.mainwindow  from Thuban.UI.mainwindow import main_menu
 from Thuban.UI.common import ThubanBeginBusyCursor, ThubanEndBusyCursor  
32  from Thuban import _  from Thuban import _
33  import Thuban.UI.baserenderer  import Thuban.UI.baserenderer
34    
35  from capabilities import WMSCapabilities  from layer import WMSLayer
   
 def epsg_code_to_projection(epsg):  
     """Find the projection for the given epsg code.  
   
     epsg -- EPSG code as string  
     """  
     proj_file, warnings = get_system_proj_file(EPSG_PROJ_FILE)  
36    
     for proj in proj_file.GetProjections():  
         if proj.EPSGCode() == epsg:  
             return proj  
     proj_file, warnings = get_system_proj_file(EPSG_DEPRECATED_PROJ_FILE)  
     for proj in proj_file.GetProjections():  
         if proj.EPSGCode() == epsg:  
             return proj  
     return None  
37    
38  class WMSExtension(Extension):  class WMSExtension(Extension):
39      def TreeInfo(self):      def TreeInfo(self):
40          return (_("Extension: %s") % self.title,          return (_("Extension: %s") % self.title,
41                  [ object.TreeInfo() for object in self.objects ])                  [ object.TreeInfo() for object in self.objects ])
42    
 class WMSLayer(BaseLayer):  
   
     def __init__(self, title, url):  
         """Initializes the WMSLayer.  
   
         title -- Title of this layer.  
         url -- URL of the WMS-Server wich must contain '?'  
   
         If an error occured, self.error_msg is a string describing  
         the problem(s). Else, self.error_msg is None.  
         """  
         BaseLayer.__init__(self, title, visible = True, projection = None)  
         self.url = url  
         self.bbox = None  
         self.latlonbbox = None  
         self.error_msg = None  
         self.layer_name = None  
         self.capabilities = None  
   
         # Change the cursor to demonstrate that we're busy but working  
         ThubanBeginBusyCursor()  
         self.capabilities = WMSCapabilities(url)  
         ThubanEndBusyCursor()  
   
         # name of the top layer of the remote map  
         foo = self.capabilities.getLayers()  
         if len(foo) == 0:  
             self.error_msg = _('No layers found in remote resource:\n'\  
                                '%s') % url  
             return  
         top_layer = foo[0]  
         self.layer_name = top_layer  
   
         # first projection of the top layer  
         foo = self.capabilities.getLayerSRS(top_layer)  
         if len(foo) == 0:  
             self.error_msg = _('No LatLonBoundingBox found for top layer %s')\  
                              % top_layer  
             return  
         top_srs = foo[0]  
   
         # BoundingBox of the top layer  
         bbox = self.capabilities.getLayerBBox(top_layer, top_srs)  
         if len(bbox) == 0:  
             self.error_msg = _('No BoundingBox found for layer %s and EPSG:')\  
                              % (top_layer, top_srs)  
             return  
         self.bbox = (float(bbox['minx']),  
                      float(bbox['miny']),  
                      float(bbox['maxx']),  
                      float(bbox['maxy']))  
   
         # LatLonBox of the top layer  
         bbox = self.capabilities.getLayerLatLonBBox(top_layer)  
         self.latlonbbox = (float(bbox['minx']),  
                            float(bbox['miny']),  
                            float(bbox['maxx']),  
                            float(bbox['maxy']))  
   
         # get projection  
         p = epsg_code_to_projection(top_srs)  
         self.SetProjection(p)  
   
         if p is None:  
             self.error_msg = _('EPSG projection code %s not found!\n'\  
                                'Setting projection to "None".\n'\  
                                'Please set an appropriate projection yourself.'\  
                                % top_srs)  
   
         # pre-determine the used format  
         self.wmsformat, self.format = \  
             self.calcFormat(self.capabilities.getFormats())  
         if self.wmsformat is None:  
             self.error_msg = \  
                 _('No supported image format found in remote resource')  
             return  
   
         # get and set the title  
         self.SetTitle(self.capabilities.getTitle().encode('latin1', 'replace'))  
   
   
     def LatLongBoundingBox(self):  
         """Return the layer's bounding box in lat-lon.  
         """  
         return self.latlonbbox  
   
     def BoundingBox(self):  
         """Return the layer's bounding box in the intrinsic coordinate system.  
         """  
         return self.bbox  
   
   
     def getFormat(self, format):  
         """  
         Return the image format for the render engine  
   
         format -- format as returned by the WMS server  
   
         If no mapping was found, None is returned  
   
         An exception rule is implemented in order to not accept  
         image/wbmp or WBMP which refers to WAP bitmap format and is  
         not supported by the included render engine.  
         """  
         fmap = {'png' : "PNG",  
                 'jpeg': "JPEG",  
                 'jpg' : "JPEG",  
                 'tif' : "TIFF",  
                 'gif' : "GIF",  
                 'wbmp': None,  
                 'bmp' : "BMP"}  
   
         for f in fmap.keys():  
             if format.lower().find(f) > -1:  
                     return fmap[f]  
         return None  
   
           
     def calcFormat(self, formats):  
         """  
         Calculate the preferred image format  
   
         formats -- list of formates as returned by the WMS server  
   
         The following priority is used:  
         - PNG  
         - JPEG  
         - TIFF  
         - GIF  
         - BMP  
   
         If no matching format was found, None, None will be returned.  
   
         An exception rule is implemented in order to not accept  
         image/wbmp or WBMP which refers to WAP bitmap format and is  
         not supported by the included render engine.  
         """  
         prio = ['jpeg', 'bmp']  
         for p in prio:  
             for f in formats:  
                 if f.lower().find(p) > -1:  
                     if f.lower().find('wbmp') == -1:  
                         return f, self.getFormat(f)  
         return None, None  
           
   
     def GetMapImg(self, width, height, bbox):  
         bbox_dict = { 'minx': bbox[0], 'miny': bbox[1],  
                       'maxx': bbox[2], 'maxy': bbox[3] }  
   
         # Change the cursor to demonstrate that we're busy but working  
         ThubanBeginBusyCursor()  
   
         wmsclient = WMSClient()  
   
         epsg_id = int(self.GetProjection().EPSGCode())  
   
         wms_response = wmsclient.getMap(self.url, self.wmsformat, width, height,  
                                    epsg_id, bbox_dict,  
                                    [self.layer_name], version = self.capabilities.getVersion())  
         ThubanEndBusyCursor()  
         return wms_response, self.format  
   
43    
44  def render_wms_layer(renderer, layer):  def render_wms_layer(renderer, layer):
45      offx, offy = renderer.offset      offx, offy = renderer.offset
# Line 301  def wms_dialog(context): Line 114  def wms_dialog(context):
114    
115      if dialog.ShowModal() == wxID_OK:      if dialog.ShowModal() == wxID_OK:
116          url = dialog.url          url = dialog.url
117            if len(url) == 0:
118                url = None
119      else:      else:
120          url = None          url = None
121      dialog.Destroy()      dialog.Destroy()
# Line 330  registry.Add(Command('wms', _('Add WMS l Line 145  registry.Add(Command('wms', _('Add WMS l
145                           helptext = _('Add a WMS Layer')))                           helptext = _('Add a WMS Layer')))
146    
147  # find the experimental menu (create it anew if not found)  # find the experimental menu (create it anew if not found)
148  main_menu = Thuban.UI.mainwindow.main_menu  experimental_menu = main_menu.FindOrInsertMenu('experimental',
149  experimental_menu = main_menu.find_menu('experimental')                                                 _('Experimenta&l'))
 if experimental_menu is None:  
     experimental_menu = main_menu.InsertMenu('experimental', _('Experimenta&l'))  
150    
151  # finally add the new entry to the experimental menu  # finally add the new entry to the experimental menu
152  experimental_menu.InsertItem('wms')  experimental_menu.InsertItem('wms')
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