/[thuban]/branches/WIP-pyshapelib-bramz/Extensions/wms/wms.py
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revision 2086 by bh, Fri Feb 20 20:09:25 2004 UTC revision 2405 by jan, Sat Nov 20 21:26:35 2004 UTC
# Line 1  Line 1 
1  # Copyright (C) 2003, 2004 by Intevation GmbH  # Copyright (C) 2003, 2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jan-Oliver Wagner <[email protected]>  # Jan-Oliver Wagner <[email protected]> (2003, 2004)
4    # Bernhard Herzog <[email protected]> (2004)
5    # Martin Schulze <[email protected]> (2004)
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 13  It just demonstrates how to add a specia Line 15  It just demonstrates how to add a specia
15  layer into Thuban via an extension.  layer into Thuban via an extension.
16  Some things are not wired, so be prepared for Exceptions  Some things are not wired, so be prepared for Exceptions
17  everywhere.  everywhere.
   
 You will need PyOGCLib 0.1.0, see  
   http://pyogclib.sourceforge.net/  
 Set the PYTHONPATH to the PyOGCLib directory before  
 starting Thuban.  
18  """  """
19    
20  __version__ = "$Revision$"  __version__ = "$Revision$"
21    # $Source$
22    # $Id$
23    
24  import os, sys  import os, sys
25  import xml.dom.minidom  import xml.dom.minidom
# Line 28  import tempfile Line 27  import tempfile
27    
28  from wxPython.wx import *  from wxPython.wx import *
29    
 from ogclib.WMSClient import WMSClient  
   
 from Thuban.Model.layer import BaseLayer  
30  from Thuban.Model.proj import Projection  from Thuban.Model.proj import Projection
31  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  
32  from Thuban.UI.command import registry, Command  from Thuban.UI.command import registry, Command
33  import Thuban.UI.mainwindow  from Thuban.UI.mainwindow import main_menu, layer_properties_dialogs
34  from Thuban import _  from Thuban import _
35  import Thuban.UI.baserenderer  import Thuban.UI.baserenderer
36    
37    from layer import WMSLayer
38    
 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)  
   
     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  
39    
40  class WMSExtension(Extension):  class WMSExtension(Extension):
41      def TreeInfo(self):      def TreeInfo(self):
42          return (_("Extension: %s") % self.title,          return (_("Extension: %s") % self.title,
43                  [ object.TreeInfo() for object in self.objects ])                  [ object.TreeInfo() for object in self.objects ])
44    
 class WMSLayer(BaseLayer, WMSClient):  
   
     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  
   
         wms_response = self.getCapabilities(self.url, '1.0')  
         self._capa_dom = xml.dom.minidom.parseString(wms_response)  
   
         root = self._capa_dom.documentElement  
         cap = root.getElementsByTagName('Capability')[0]  
         layer = cap.getElementsByTagName('Layer')[0]  
   
         # get projected bounding box and latlon bounding box  
         for node in layer.childNodes:  
             if node.nodeName == 'BoundingBox':  
                 minx = node.attributes.get('minx').nodeValue  
                 miny = node.attributes.get('miny').nodeValue  
                 maxx = node.attributes.get('maxx').nodeValue  
                 maxy = node.attributes.get('maxy').nodeValue  
                 self.bbox = (float(minx), float(miny), float(maxx), float(maxy))  
         bbox = layer.getElementsByTagName('LatLonBoundingBox')[0]  
         self.layer_name = layer.getElementsByTagName('Name')[0].childNodes[0].data  
         minx = bbox.attributes.get('minx').nodeValue  
         miny = bbox.attributes.get('miny').nodeValue  
         maxx = bbox.attributes.get('maxx').nodeValue  
         maxy = bbox.attributes.get('maxy').nodeValue  
         self.latlonbbox = (float(minx), float(miny), float(maxx), float(maxy))  
   
         # get projection  
         srs = layer.getElementsByTagName('SRS')[0].childNodes[0].data  
         if len(srs.split(':')) == 1:  
             epsg_id = srs  
         else:  
             epsg_id = srs.split(':')[1]  
   
         p = epsg_code_to_projection(epsg_id)  
         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.'\  
                                % epsg_id)  
   
         # get title  
         title = layer.getElementsByTagName('Title')[0].childNodes[0].data  
         self.SetTitle(title.encode('latin1', 'replace'))  
   
         self._capa_dom.unlink()  
   
     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 GetMapImg(self, width, height, bbox):  
         bbox_dict = { 'minx': bbox[0], 'miny': bbox[1],  
                       'maxx': bbox[2], 'maxy': bbox[3] }  
         epsg_id = int(self.GetProjection().EPSGCode())  
         wms_response = self.getMap(self.url, 'JPEG', width, height,  
                                    epsg_id, bbox_dict,  
                                    [self.layer_name], version = '1.0')  
         return wms_response  
   
   
45    
46  def render_wms_layer(renderer, layer):  def render_wms_layer(renderer, layer):
47      offx, offy = renderer.offset      offx, offy = renderer.offset
# Line 156  def render_wms_layer(renderer, layer): Line 53  def render_wms_layer(renderer, layer):
53      xmax = (width - offx) / scale      xmax = (width - offx) / scale
54      ymax = (offy - 0) / scale      ymax = (offy - 0) / scale
55    
56      img = layer.GetMapImg(width, height, (xmin, ymin, xmax, ymax))      img, format = layer.GetMapImg(width, height, (xmin, ymin, xmax, ymax))
57      renderer.draw_raster_data(img, "JPEG")      renderer.draw_raster_data(img, format)
58    
59      return ()      return ()
60    
61  Thuban.UI.baserenderer.add_renderer_extension(WMSLayer, render_wms_layer)  Thuban.UI.baserenderer.add_renderer_extension(WMSLayer, render_wms_layer)
62    from properties import wmsProperties
63    layer_properties_dialogs.add(WMSLayer, wmsProperties)
64    
65    
66  class SelectWMSServer(wxDialog):  class SelectWMSServer(wxDialog):
# Line 219  def wms_dialog(context): Line 118  def wms_dialog(context):
118    
119      if dialog.ShowModal() == wxID_OK:      if dialog.ShowModal() == wxID_OK:
120          url = dialog.url          url = dialog.url
121            if len(url) == 0:
122                url = None
123      else:      else:
124          url = None          url = None
125      dialog.Destroy()      dialog.Destroy()
# Line 248  registry.Add(Command('wms', _('Add WMS l Line 149  registry.Add(Command('wms', _('Add WMS l
149                           helptext = _('Add a WMS Layer')))                           helptext = _('Add a WMS Layer')))
150    
151  # find the experimental menu (create it anew if not found)  # find the experimental menu (create it anew if not found)
152  main_menu = Thuban.UI.mainwindow.main_menu  experimental_menu = main_menu.FindOrInsertMenu('experimental',
153  experimental_menu = main_menu.find_menu('experimental')                                                 _('Experimenta&l'))
 if experimental_menu is None:  
     experimental_menu = main_menu.InsertMenu('experimental', _('Experimenta&l'))  
154    
155  # finally add the new entry to the experimental menu  # finally add the new entry to the experimental menu
156  experimental_menu.InsertItem('wms')  experimental_menu.InsertItem('wms')
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