gmapnix/DrawMapCairo.cpp

/*
  Copyright (C) 2021 Nicole Faerber <nicole.faerber@dpin.de>
  based on:
  DrawMap - a demo program for libosmscout
  Copyright (C) 2009  Tim Teulings

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


#include <iostream>

#include <osmscout/Database.h>
#include <osmscout/MapService.h>
#include <osmscout/BasemapDatabase.h>
#include <osmscout/MapPainterCairo.h>

#include <DrawMapCairo.h>

/*
  Example for the nordrhein-westfalen.osm (to be executed in meson build directory):

  Demos/DrawMapCairo ../maps/nordrhein-westfalen ../stylesheets/standard.oss 800 480 51.51241 7.46525 70000 test.png
 */

static osmscout::DatabaseParameter databaseParameter;
static osmscout::DatabaseRef       database;
static osmscout::MapServiceRef     mapService;
static osmscout::StyleConfigRef    styleConfig;

static osmscout::BasemapDatabaseRef basemapDatabase;

static osmscout::MercatorProjection  projection;
static osmscout::MapParameter        drawParameter;
static osmscout::AreaSearchParameter searchParameter;
static osmscout::MapData             data;

static std::list<osmscout::TileRef> tiles;

static osmscout::MapPainterCairo     *cairoMapPainter{nullptr};


int DrawMapCairoInit(int argc, char* argv[])
{
  std::list<std::string> iconPaths;

  database=std::make_shared<osmscout::Database>(databaseParameter);
  if (!database->Open("data/nordrhein-westfalen-latest/")) {
    std::cerr << "Cannot open database" << std::endl;
    return -1;
  }

  mapService=std::make_shared<osmscout::MapService>(database);

  styleConfig = std::make_shared<osmscout::StyleConfig>(database->GetTypeConfig());
  if (!styleConfig->Load("data/standard.oss")) {
    std::cerr << "Cannot open style" << std::endl;
    return -1;
  }
  drawParameter.SetFontName("/usr/share/fonts/TTF/LiberationSans-Regular.ttf");
  drawParameter.SetFontSize(3.0);
  drawParameter.SetRenderSeaLand(true);
  drawParameter.SetRenderUnknowns(false);
  drawParameter.SetRenderBackground(false);
  drawParameter.SetRenderContourLines(false);
  drawParameter.SetRenderHillShading(false);

  drawParameter.SetIconMode(osmscout::MapParameter::IconMode::Scalable);
  iconPaths.push_back("data/icons/svg/standard/");
  drawParameter.SetIconPaths(iconPaths);
  drawParameter.SetPatternMode(osmscout::MapParameter::PatternMode::Scalable);
  drawParameter.SetPatternPaths(iconPaths);

  drawParameter.SetDebugData(false);
  drawParameter.SetDebugPerformance(false);

  drawParameter.SetLabelLineMinCharCount(15);
  drawParameter.SetLabelLineMaxCharCount(30);
  drawParameter.SetLabelLineFitToArea(true);

  //LoadBaseMapTiles(data.baseMapTiles);
  
  assert(database);
  assert(database->IsOpen());
  assert(mapService);
  assert(styleConfig);

  cairoMapPainter = new osmscout::MapPainterCairo(styleConfig);

  return 0;
}

int DrawMapCairo(cairo_surface_t *surface, double lat, double lon, unsigned int zoomlevel, double direction)
{
  osmscout::GeoCoord       center(lat, lon);
  osmscout::Magnification  zoom; /*{osmscout::Magnification::magClose};*/
  osmscout::GeoBox boundingBox;
  cairo_t *cairo=cairo_create(surface);

  assert(database);
  assert(database->IsOpen());
  assert(mapService);
  assert(styleConfig);

  zoom.SetMagnification(zoomlevel);
  projection.Set(center, direction, zoom, 96, 800, 600);
  projection.GetDimensions(boundingBox);
  mapService->GetGroundTiles(projection, data.groundTiles);
  mapService->LookupTiles(projection, tiles);
  mapService->LoadMissingTileData(searchParameter,*styleConfig, tiles);
  mapService->AddTileDataToMapData(tiles, data);

  if (!cairoMapPainter->DrawMap(projection, drawParameter, data, cairo))
      std::cerr << "Cannot paint" << std::endl;;

  cairo_destroy(cairo);

  return 0;
}