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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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from capabilities import WMSCapabilities |
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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): |
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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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self.capabilities = None |
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|
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# Change the cursor to demonstrate that we're busy but working |
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wxBeginBusyCursor() |
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self.capabilities = WMSCapabilities(url) |
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wxEndBusyCursor() |
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|
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# name of the top layer of the remote map |
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foo = self.capabilities.getLayers() |
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if len(foo) == 0: |
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self.error_msg = _('No layers found in remote resource:\n'\ |
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'%s') % url |
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return |
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top_layer = foo[0] |
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self.layer_name = top_layer |
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|
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# first projection of the top layer |
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foo = self.capabilities.getLayerSRS(top_layer) |
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if len(foo) == 0: |
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self.error_msg = _('No LatLonBoundingBox found for top layer %s')\ |
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% top_layer |
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return |
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top_srs = foo[0] |
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|
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# BoundingBox of the top layer |
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bbox = self.capabilities.getLayerBBox(top_layer, top_srs) |
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if len(bbox) == 0: |
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self.error_msg = _('No BoundingBox found for layer %s and EPSG:')\ |
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% (top_layer, top_srs) |
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return |
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self.bbox = (float(bbox['minx']), |
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float(bbox['miny']), |
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float(bbox['maxx']), |
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float(bbox['maxy'])) |
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|
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# LatLonBox of the top layer |
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bbox = self.capabilities.getLayerLatLonBBox(top_layer) |
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self.latlonbbox = (float(bbox['minx']), |
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float(bbox['miny']), |
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float(bbox['maxx']), |
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float(bbox['maxy'])) |
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|
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# get projection |
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p = epsg_code_to_projection(top_srs) |
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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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# pre-determine the used format |
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self.wmsformat, self.format = \ |
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self.calcFormat(self.capabilities.getFormats()) |
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if self.wmsformat is None: |
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self.error_msg = \ |
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_('No supported image format found in remote resource') |
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return |
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|
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# get and set the title |
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self.SetTitle(self.capabilities.getTitle().encode('latin1', 'replace')) |
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|
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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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|
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def getFormat(self, format): |
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""" |
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Return the image format for the render engine |
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|
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format -- format as returned by the WMS server |
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|
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If no mapping was found, None is returned |
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|
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An exception rule is implemented in order to not accept |
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image/wbmp or WBMP which refers to WAP bitmap format and is |
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not supported by the included render engine. |
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""" |
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fmap = {'png' : "PNG", |
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'jpeg': "JPEG", |
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'jpg' : "JPEG", |
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'tif' : "TIFF", |
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'gif' : "GIF", |
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'wbmp': None, |
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'bmp' : "BMP"} |
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|
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for f in fmap.keys(): |
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if format.lower().find(f) > -1: |
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return fmap[f] |
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return None |
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|
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|
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def calcFormat(self, formats): |
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""" |
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Calculate the preferred image format |
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|
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formats -- list of formates as returned by the WMS server |
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|
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The following priority is used: |
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- PNG |
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- JPEG |
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- TIFF |
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- GIF |
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- BMP |
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|
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If no matching format was found, None, None will be returned. |
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|
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An exception rule is implemented in order to not accept |
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image/wbmp or WBMP which refers to WAP bitmap format and is |
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not supported by the included render engine. |
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""" |
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prio = ['png', 'jpeg', 'jpg', 'tif', 'gif', 'bmp'] |
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for p in prio: |
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for f in formats: |
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if f.lower().find(p) > -1: |
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if f.lower().find('wbmp') == -1: |
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return f, self.getFormat(f) |
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return None, None |
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|
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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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|
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# Change the cursor to demonstrate that we're busy but working |
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wxBeginBusyCursor() |
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|
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wmsclient = WMSClient() |
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|
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epsg_id = int(self.GetProjection().EPSGCode()) |
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|
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wms_response = wmsclient.getMap(self.url, self.wmsformat, width, height, |
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epsg_id, bbox_dict, |
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[self.layer_name], version = self.capabilities.getVersion()) |
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wxEndBusyCursor() |
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return wms_response, self.format |
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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, format = layer.GetMapImg(width, height, (xmin, ymin, xmax, ymax)) |
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renderer.draw_raster_data(img, format) |
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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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