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class WMSLayer: |
class WMSLayer: |
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__init__() |
__init__() |
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LatLongBoundingBox() |
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BoundingBox() |
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getFormat(format) |
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calcFormat(formats) |
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getFormats() |
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getLayers() |
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getLayerTitle() |
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getWMSFormat() |
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setWMSFormat(format) |
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GetMapImg(width, height, bbox) |
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Requirements: |
Requirements: |
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- PyOGCLib <http://www.sourceforge.net/projects/pyogclib> |
- PyOGCLib <http://www.sourceforge.net/projects/pyogclib> |
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class WMSLayer(BaseLayer): |
class WMSLayer(BaseLayer): |
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""" |
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WMS Layer |
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This layer incorporates all methods from the Thuban BaseLayer and |
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adds specific methods for operating with a WMS server. |
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""" |
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def __init__(self, title, url): |
def __init__(self, title, url): |
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"""Initializes the WMSLayer. |
"""Initializes the WMSLayer. |
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def LatLongBoundingBox(self): |
def LatLongBoundingBox(self): |
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"""Return the layer's bounding box in lat-lon. |
""" |
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Return the layer's bounding box in lat-lon |
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""" |
""" |
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return self.latlonbbox |
return self.latlonbbox |
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def BoundingBox(self): |
def BoundingBox(self): |
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"""Return the layer's bounding box in the intrinsic coordinate system. |
""" |
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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 |
return self.bbox |
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format -- format as returned by the WMS server |
format -- format as returned by the WMS server |
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If no mapping was found, None is returned |
If no mapping was found, None is returned. |
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This routine uses a simple heuristic in order to find the |
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broken down image format to be used with the internal render |
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engine. |
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An exception rule is implemented in order to not accept |
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 |
image/wbmp or WBMP which refers to WAP bitmap format and is |
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return None, None |
return None, None |
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def getFormats(self): |
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""" |
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Return the list of supported image formats by the WMS server |
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These formats may be used in the WMS GetMap request. Data is |
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retrieved from the included WMSCapabilities object. |
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The called method from WMSCapabilities will default to |
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'image/jpeg' if no format is recognised in XML Capabilities, |
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assuming that JPEG will always be supported on the server side |
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with this encoding. |
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""" |
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return self.capabilities.getFormats() |
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def getLayers(self): |
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""" |
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Return the list of layer names supported by the WMS server |
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Data is retrieved from the included WMSCapabilities object. |
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Only named layers will be returned, since a layer may have a |
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title but doesn't have to have a name associated to it as |
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well. If no layers were found, an empty list is returned. |
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""" |
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return self.capabilities.getLayers() |
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def getLayerTitle(self, layer): |
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""" |
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Return the title of the named layer |
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Data is retrieved from the included WMSCapabilities object. |
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If no such title or no such layer exists, an empty string is |
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returned. |
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""" |
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return self.capabilities.getLayerTitle(layer) |
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def getWMSFormat(self): |
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""" |
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Return the image format that is used for WMS GetMap requests |
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""" |
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return self.wmsformat |
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def setWMSFormat(self, format): |
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""" |
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Set the image format that is used for WMS GetMap requests |
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format -- format, one of getFormats() |
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""" |
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self.wmsformat = format |
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def GetMapImg(self, width, height, bbox): |
def GetMapImg(self, width, height, bbox): |
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""" |
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Retrieve a new map from the WMS server and return it |
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width -- width in pixel of the desired image |
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height -- height in pixel of the desired image |
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bbox -- array of min(x,y) max(x,y) in the given SRS |
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SRS and used image format will be retrieved from within the |
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layer itself. |
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""" |
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bbox_dict = { 'minx': bbox[0], 'miny': bbox[1], |
bbox_dict = { 'minx': bbox[0], 'miny': bbox[1], |
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'maxx': bbox[2], 'maxy': bbox[3] } |
'maxx': bbox[2], 'maxy': bbox[3] } |
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