QGIS API Documentation  3.8.0-Zanzibar (11aff65)
qgswmsgetmap.cpp
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1 /***************************************************************************
2  qgswmsgetmap.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 "qgswmsgetmap.h"
23 #include "qgswmsrenderer.h"
24 #include "qgswmsserviceexception.h"
25 
26 #include <QImage>
27 
28 namespace QgsWms
29 {
30 
31  void writeGetMap( QgsServerInterface *serverIface, const QgsProject *project,
32  const QString &, const QgsServerRequest &request,
33  QgsServerResponse &response )
34  {
35  // get wms parameters from query
36  const QgsWmsParameters parameters( QUrlQuery( request.url() ) );
37 
38  // prepare render context
39  QgsWmsRenderContext context( project, serverIface );
47  context.setParameters( parameters );
48 
49  // rendering
50  QgsRenderer renderer( context );
51  std::unique_ptr<QImage> result( renderer.getMap() );
52 
53  if ( result )
54  {
55  const QString format = request.parameters().value( QStringLiteral( "FORMAT" ), QStringLiteral( "PNG" ) );
56  writeImage( response, *result, format, context.imageQuality() );
57  }
58  else
59  {
60  throw QgsException( QStringLiteral( "Failed to compute GetMap image" ) );
61  }
62  }
63 } // namespace QgsWms
void writeGetMap(QgsServerInterface *serverIface, const QgsProject *project, const QString &, const QgsServerRequest &request, QgsServerResponse &response)
Output GetMap response in DXF format.
int imageQuality() const
Returns the image quality to use for rendering according to the current configuration.
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.
QImage * getMap()
Returns the map as an image (or nullptr in case of error).
void writeImage(QgsServerResponse &response, QImage &img, const QString &formatStr, int imageQuality)
Write image response.
QgsServerRequest::Parameters parameters() const
Returns a map of query parameters with keys converted to uppercase.
Provides an interface to retrieve and manipulate WMS parameters received from the client...
Reads and writes project states.
Definition: qgsproject.h:89
Median cut implementation.
QgsServerRequest Class defining request interface passed to services QgsService::executeRequest() met...
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...
Defines a QGIS exception class.
Definition: qgsexception.h:34