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# Copyright (C) 2003, 2004 by Intevation GmbH |
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# Authors: |
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# Jan-Oliver Wagner <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with Thuban for details. |
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|
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""" |
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Provide layers via OGC WMS. |
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|
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This extension is in a very experimental stage! |
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It just demonstrates how to add a special |
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layer into Thuban via an extension. |
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Some things are not wired, so be prepared for Exceptions |
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everywhere. |
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|
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You will need PyOGCLib 0.1.0, see |
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http://pyogclib.sourceforge.net/ |
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Set the PYTHONPATH to the PyOGCLib directory before |
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starting Thuban. |
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""" |
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|
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__version__ = "$Revision$" |
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|
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import os, sys |
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import xml.dom.minidom |
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import tempfile |
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|
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from wxPython.wx import * |
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|
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from ogclib.WMSClient import WMSClient |
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|
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from Thuban.Model.layer import BaseLayer |
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from Thuban.Model.proj import Projection |
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from Thuban.Model.extension import Extension |
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from Thuban.Model.resource import get_system_proj_file, EPSG_PROJ_FILE, \ |
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EPSG_DEPRECATED_PROJ_FILE |
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from Thuban.UI.command import registry, Command |
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import Thuban.UI.mainwindow |
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from Thuban import _ |
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import Thuban.UI.baserenderer |
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|
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|
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def epsg_code_to_projection(epsg): |
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"""Find the projection for the given epsg code. |
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|
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epsg -- EPSG code as string |
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""" |
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proj_file, warnings = get_system_proj_file(EPSG_PROJ_FILE) |
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|
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for proj in proj_file.GetProjections(): |
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if proj.EPSGCode() == epsg: |
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return proj |
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proj_file, warnings = get_system_proj_file(EPSG_DEPRECATED_PROJ_FILE) |
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for proj in proj_file.GetProjections(): |
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if proj.EPSGCode() == epsg: |
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return proj |
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return None |
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|
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class WMSExtension(Extension): |
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def TreeInfo(self): |
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return (_("Extension: %s") % self.title, |
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[ object.TreeInfo() for object in self.objects ]) |
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|
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class WMSLayer(BaseLayer, WMSClient): |
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|
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def __init__(self, title, url): |
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"""Initializes the WMSLayer. |
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|
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title -- Title of this layer. |
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url -- URL of the WMS-Server wich must contain '?' |
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|
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If an error occured, self.error_msg is a string describing |
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the problem(s). Else, self.error_msg is None. |
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""" |
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BaseLayer.__init__(self, title, visible = True, projection = None) |
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self.url = url |
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self.bbox = None |
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self.latlonbbox = None |
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self.error_msg = None |
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self.layer_name = None |
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|
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wms_response = self.getCapabilities(self.url, '1.0') |
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self._capa_dom = xml.dom.minidom.parseString(wms_response) |
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|
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root = self._capa_dom.documentElement |
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cap = root.getElementsByTagName('Capability')[0] |
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layer = cap.getElementsByTagName('Layer')[0] |
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|
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# get projected bounding box and latlon bounding box |
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for node in layer.childNodes: |
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if node.nodeName == 'BoundingBox': |
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minx = node.attributes.get('minx').nodeValue |
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miny = node.attributes.get('miny').nodeValue |
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maxx = node.attributes.get('maxx').nodeValue |
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maxy = node.attributes.get('maxy').nodeValue |
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self.bbox = (float(minx), float(miny), float(maxx), float(maxy)) |
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bbox = layer.getElementsByTagName('LatLonBoundingBox')[0] |
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self.layer_name = layer.getElementsByTagName('Name')[0].childNodes[0].data |
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minx = bbox.attributes.get('minx').nodeValue |
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miny = bbox.attributes.get('miny').nodeValue |
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maxx = bbox.attributes.get('maxx').nodeValue |
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maxy = bbox.attributes.get('maxy').nodeValue |
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self.latlonbbox = (float(minx), float(miny), float(maxx), float(maxy)) |
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|
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# get projection |
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srs = layer.getElementsByTagName('SRS')[0].childNodes[0].data |
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if len(srs.split(':')) == 1: |
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epsg_id = srs |
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else: |
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epsg_id = srs.split(':')[1] |
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|
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p = epsg_code_to_projection(epsg_id) |
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self.SetProjection(p) |
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|
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if p is None: |
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self.error_msg = _('EPSG projection code %s not found!\n'\ |
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'Setting projection to "None".\n'\ |
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'Please set an appropriate projection yourself.'\ |
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% epsg_id) |
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|
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# get title |
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title = layer.getElementsByTagName('Title')[0].childNodes[0].data |
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self.SetTitle(title.encode('latin1', 'replace')) |
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|
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self._capa_dom.unlink() |
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|
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def LatLongBoundingBox(self): |
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"""Return the layer's bounding box in lat-lon. |
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""" |
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return self.latlonbbox |
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|
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def BoundingBox(self): |
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"""Return the layer's bounding box in the intrinsic coordinate system. |
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""" |
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return self.bbox |
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|
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def GetMapImg(self, width, height, bbox): |
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bbox_dict = { 'minx': bbox[0], 'miny': bbox[1], |
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'maxx': bbox[2], 'maxy': bbox[3] } |
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epsg_id = int(self.GetProjection().EPSGCode()) |
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wms_response = self.getMap(self.url, 'JPEG', width, height, |
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epsg_id, bbox_dict, |
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[self.layer_name], version = '1.0') |
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return wms_response |
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|
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|
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|
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def render_wms_layer(renderer, layer): |
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offx, offy = renderer.offset |
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width, height = renderer.dc.GetSizeTuple() |
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|
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scale = renderer.scale |
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xmin = (0 - offx) / scale |
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ymin = (offy - height) / scale |
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xmax = (width - offx) / scale |
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ymax = (offy - 0) / scale |
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|
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img = layer.GetMapImg(width, height, (xmin, ymin, xmax, ymax)) |
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renderer.draw_raster_data(img, "JPEG") |
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|
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return () |
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|
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Thuban.UI.baserenderer.add_renderer_extension(WMSLayer, render_wms_layer) |
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|
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|
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class SelectWMSServer(wxDialog): |
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|
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ID_COMBOVALUE = 4003 |
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|
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def __init__(self, parent): |
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wxDialog.__init__(self, parent, -1, _("Select WMS Server"), |
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style = wxDEFAULT_DIALOG_STYLE |
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| wxSYSTEM_MENU |
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| wxRESIZE_BORDER) |
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|
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self.combo_value = wxComboBox(self, self.ID_COMBOVALUE, size=(500,-1)) |
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self.combo_value.Append("") |
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self.combo_value.Append('http://frida.intevation.org/cgi-bin/frida_wms?') |
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#self.combo_value.Append('http://wms.jpl.nasa.gov/wms.cgi?') |
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#self.combo_value.Append('http://eukrante.hq:9089/cgi-bin/wms_shg?') |
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#self.combo_value.Append('http://131.220.106.112:8080/deegree0.7/wms?') |
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#self.combo_value.Append('http://demo.cubewerx.com/demo/cubeserv/cubeserv.cgi?CONFIG=gita&') |
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self.combo_value.SetSelection(0) |
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|
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button_ok = wxButton(self, wxID_OK, _("OK")) |
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button_ok.SetDefault() |
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button_close = wxButton(self, wxID_CANCEL, _("Close")) |
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|
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vbox = wxBoxSizer(wxVERTICAL) |
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vbox.Add(self.combo_value, 1, wxEXPAND|wxALL|wxCB_SORT, 10) |
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hbox = wxBoxSizer(wxHORIZONTAL) |
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hbox.Add(button_ok, 0, wxALL, 10) |
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hbox.Add(button_close, 0, wxALL, 10) |
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vbox.Add(hbox, 0, 10) |
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|
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self.SetAutoLayout(True) |
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self.SetSizer(vbox) |
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vbox.Fit(self) |
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vbox.SetSizeHints(self) |
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self.Layout() |
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|
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EVT_BUTTON(self, wxID_OK, self.OnOK) |
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EVT_BUTTON(self, wxID_CANCEL, self.OnCancel) |
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|
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def OnOK(self, event): |
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self.url = self.combo_value.GetValue() |
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self.EndModal(wxID_OK) |
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|
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def OnCancel(self, event): |
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self.EndModal(wxID_CANCEL) |
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|
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def wms_dialog(context): |
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"""Request URL from user and add WMS Layer. |
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|
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context -- The Thuban context. |
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""" |
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dialog = SelectWMSServer(context.mainwindow) |
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|
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if dialog.ShowModal() == wxID_OK: |
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url = dialog.url |
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else: |
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url = None |
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dialog.Destroy() |
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|
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if url is None: |
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return |
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|
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wms_layer = WMSLayer('A WMS Layer', url) |
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if wms_layer.error_msg is not None: |
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context.mainwindow.RunMessageBox(_('WMS'), wms_layer.error_msg) |
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|
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map = context.mainwindow.canvas.Map() |
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if map.projection is None: |
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map.SetProjection(wms_layer.projection) |
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has_layers = map.HasLayers() |
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map.AddLayer(wms_layer) |
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if not has_layers: |
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# if we're adding a layer to an empty map, fit the |
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# new map to the window |
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context.mainwindow.canvas.FitMapToWindow() |
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|
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wxInitAllImageHandlers() |
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wms_extension = WMSExtension('WMS') |
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|
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# register the new command |
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registry.Add(Command('wms', _('Add WMS layer ...'), wms_dialog, |
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helptext = _('Add a WMS Layer'))) |
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|
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# find the experimental menu (create it anew if not found) |
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main_menu = Thuban.UI.mainwindow.main_menu |
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experimental_menu = main_menu.find_menu('experimental') |
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if experimental_menu is None: |
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experimental_menu = main_menu.InsertMenu('experimental', _('Experimenta&l')) |
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|
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# finally add the new entry to the experimental menu |
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experimental_menu.InsertItem('wms') |
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