QGIS API Documentation  3.8.0-Zanzibar (11aff65)
qgswmsgetfeatureinfo.cpp
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1 /***************************************************************************
2  qgswmsgetfeatureinfo.cpp
3  -------------------------
4  begin : December 20 , 2016
5  copyright : (C) 2007 by Marco Hugentobler (original code)
6  (C) 2014 by Alessandro Pasotti (original code)
7  (C) 2016 by David Marteau
8  email : marco dot hugentobler at karto dot baug dot ethz dot ch
9  a dot pasotti at itopen dot it
10  david dot marteau at 3liz dot com
11  ***************************************************************************/
12 
13 /***************************************************************************
14  * *
15  * This program is free software; you can redistribute it and/or modify *
16  * it under the terms of the GNU General Public License as published by *
17  * the Free Software Foundation; either version 2 of the License, or *
18  * (at your option) any later version. *
19  * *
20  ***************************************************************************/
21 #include "qgswmsutils.h"
22 #include "qgswmsgetfeatureinfo.h"
23 #include "qgswmsrenderer.h"
24 
25 namespace QgsWms
26 {
27  void writeGetFeatureInfo( QgsServerInterface *serverIface, const QgsProject *project,
28  const QString &version, const QgsServerRequest &request,
29  QgsServerResponse &response )
30  {
31  // get wms parameters from query
32  QgsWmsParameters parameters( QUrlQuery( request.url() ) );
33 
34  // WIDTH and HEIGHT are not mandatory, but we need to set a default size
35  if ( ( parameters.widthAsInt() <= 0
36  || parameters.heightAsInt() <= 0 )
37  && ! parameters.infoFormatIsImage() )
38  {
39  QSize size( 10, 10 );
40 
41  if ( ! parameters.filterGeom().isEmpty() )
42  {
43  const QgsRectangle bbox = QgsGeometry::fromWkt( parameters.filterGeom() ).boundingBox();
44  const int defaultWidth = 800;
45  size.setWidth( defaultWidth );
46  size.setHeight( defaultWidth * bbox.height() / bbox.width() );
47  }
48 
49  parameters.set( QgsWmsParameter::WIDTH, size.width() );
50  parameters.set( QgsWmsParameter::HEIGHT, size.height() );
51  }
52 
53  // prepare render context
54  QgsWmsRenderContext context( project, serverIface );
59  context.setParameters( parameters );
60 
61  const QString infoFormat = request.parameters().value( QStringLiteral( "INFO_FORMAT" ), QStringLiteral( "text/plain" ) );
62  response.setHeader( QStringLiteral( "Content-Type" ), infoFormat + QStringLiteral( "; charset=utf-8" ) );
63 
64  QgsRenderer renderer( context );
65  response.write( renderer.getFeatureInfo( version ) );
66  }
67 } // namespace QgsWms
QByteArray getFeatureInfo(const QString &version="1.3.0")
Creates an xml document that describes the result of the getFeatureInfo request.
virtual void setHeader(const QString &key, const QString &value)=0
Set Header entry Add Header entry to the response Note that it is usually an error to set Header afte...
A rectangle specified with double values.
Definition: qgsrectangle.h:41
int widthAsInt() const
Returns WIDTH parameter as an int or its default value if not defined.
void writeGetFeatureInfo(QgsServerInterface *serverIface, const QgsProject *project, const QString &version, const QgsServerRequest &request, QgsServerResponse &response)
Output GetFeatureInfo response.
virtual void write(const QString &data)
Write string This is a convenient method that will write directly to the underlying I/O device...
void setFlag(Flag flag, bool on=true)
Sets or unsets a rendering flag according to the on value.
void setParameters(const QgsWmsParameters &parameters)
Sets WMS parameters.
QString filterGeom() const
Returns the filter geometry found in FILTER_GEOM parameter.
QgsServerRequest::Parameters parameters() const
Returns a map of query parameters with keys converted to uppercase.
double width() const
Returns the width of the rectangle.
Definition: qgsrectangle.h:202
Provides an interface to retrieve and manipulate WMS parameters received from the client...
Reads and writes project states.
Definition: qgsproject.h:89
void set(QgsWmsParameter::Name name, const QVariant &value)
Sets a parameter value thanks to its name.
Median cut implementation.
QgsServerRequest Class defining request interface passed to services QgsService::executeRequest() met...
int heightAsInt() const
Returns HEIGHT parameter as an int or its default value if not defined.
static QgsGeometry fromWkt(const QString &wkt)
Creates a new geometry from a WKT string.
QgsServerInterface Class defining interfaces exposed by QGIS Server and made available to plugins...
Map renderer for WMS requests.
Rendering context for the WMS renderer.
QgsServerResponse Class defining response interface passed to services QgsService::executeRequest() m...
bool infoFormatIsImage() const
Checks if INFO_FORMAT parameter is one of the image formats (PNG, JPG).
double height() const
Returns the height of the rectangle.
Definition: qgsrectangle.h:209