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qgstiles.cpp
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qgstiles.cpp
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/***************************************************************************
qgstiles.cpp
--------------------------------------
Date : March 2020
Copyright : (C) 2020 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "qgstiles.h"
#include "qgslogger.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsrendercontext.h"
#include "qgsunittypes.h"
QgsTileMatrix QgsTileMatrix::fromWebMercator( int zoomLevel )
{
constexpr double z0xMin = -20037508.3427892;
constexpr double z0yMax = 20037508.3427892;
return fromCustomDef( zoomLevel, QgsCoordinateReferenceSystem( QStringLiteral( "EPSG:3857" ) ), QgsPointXY( z0xMin, z0yMax ), 2 * z0yMax );
}
QgsTileMatrix QgsTileMatrix::fromCustomDef( int zoomLevel, const QgsCoordinateReferenceSystem &crs,
const QgsPointXY &z0TopLeftPoint, double z0Dimension, int z0MatrixWidth, int z0MatrixHeight )
{
// Square extent calculation
double z0xMin = z0TopLeftPoint.x();
double z0yMax = z0TopLeftPoint.y();
double z0xMax = z0xMin + z0MatrixWidth * z0Dimension;
double z0yMin = z0yMax - z0MatrixHeight * z0Dimension;
// Constant for scale denominator calculation
constexpr double TILE_SIZE = 256.0;
constexpr double PIXELS_TO_M = 2.8 / 10000.0; // WMS/WMTS define "standardized rendering pixel size" as 0.28mm
const double unitToMeters = QgsUnitTypes::fromUnitToUnitFactor( crs.mapUnits(), Qgis::DistanceUnit::Meters );
// Scale denominator calculation
const double scaleDenom0 = ( z0Dimension / TILE_SIZE ) * ( unitToMeters / PIXELS_TO_M );
int numTiles = static_cast<int>( pow( 2, zoomLevel ) ); // assuming we won't ever go over 30 zoom levels
QgsTileMatrix tm;
tm.mCrs = crs;
tm.mZoomLevel = zoomLevel;
tm.mMatrixWidth = z0MatrixWidth * numTiles;
tm.mMatrixHeight = z0MatrixHeight * numTiles;
tm.mTileXSpan = ( z0xMax - z0xMin ) / tm.mMatrixWidth;
tm.mTileYSpan = ( z0yMax - z0yMin ) / tm.mMatrixHeight;
tm.mExtent = QgsRectangle( z0xMin, z0yMin, z0xMax, z0yMax );
tm.mScaleDenom = scaleDenom0 / pow( 2, zoomLevel );
return tm;
}
QgsTileMatrix QgsTileMatrix::fromTileMatrix( const int zoomLevel, const QgsTileMatrix &tileMatrix )
{
QgsTileMatrix tm;
int numTiles = static_cast<int>( pow( 2, zoomLevel ) ); // assuming we won't ever go over 30 zoom levels
int aZoomLevel = tileMatrix.zoomLevel();
int aNumTiles = static_cast<int>( pow( 2, aZoomLevel ) );
int aMatrixWidth = tileMatrix.matrixWidth();
int aMatrixHeight = tileMatrix.matrixHeight();
QgsRectangle aExtent = tileMatrix.extent();
tm.mCrs = tileMatrix.crs();
tm.mZoomLevel = zoomLevel;
tm.mMatrixWidth = aMatrixWidth * numTiles / aNumTiles;
tm.mMatrixHeight = aMatrixHeight * numTiles / aNumTiles;
tm.mTileXSpan = aExtent.width() / tm.mMatrixWidth;
tm.mTileYSpan = aExtent.height() / tm.mMatrixHeight;
tm.mExtent = aExtent;
tm.mScaleDenom = tileMatrix.scale() * pow( 2, aZoomLevel ) / pow( 2, zoomLevel );
return tm;
}
QgsRectangle QgsTileMatrix::tileExtent( QgsTileXYZ id ) const
{
double xMin = mExtent.xMinimum() + mTileXSpan * id.column();
double xMax = xMin + mTileXSpan;
double yMax = mExtent.yMaximum() - mTileYSpan * id.row();
double yMin = yMax - mTileYSpan;
return QgsRectangle( xMin, yMin, xMax, yMax );
}
QgsPointXY QgsTileMatrix::tileCenter( QgsTileXYZ id ) const
{
double x = mExtent.xMinimum() + mTileXSpan * id.column() + mTileXSpan / 2;
double y = mExtent.yMaximum() - mTileYSpan * id.row() - mTileYSpan / 2;
return QgsPointXY( x, y );
}
QgsTileRange QgsTileMatrix::tileRangeFromExtent( const QgsRectangle &r ) const
{
double x0 = std::clamp( r.xMinimum(), mExtent.xMinimum(), mExtent.xMaximum() );
double y0 = std::clamp( r.yMinimum(), mExtent.yMinimum(), mExtent.yMaximum() );
double x1 = std::clamp( r.xMaximum(), mExtent.xMinimum(), mExtent.xMaximum() );
double y1 = std::clamp( r.yMaximum(), mExtent.yMinimum(), mExtent.yMaximum() );
if ( x0 >= x1 || y0 >= y1 )
return QgsTileRange(); // nothing to display
double tileX1 = ( x0 - mExtent.xMinimum() ) / mTileXSpan;
double tileX2 = ( x1 - mExtent.xMinimum() ) / mTileXSpan;
double tileY1 = ( mExtent.yMaximum() - y1 ) / mTileYSpan;
double tileY2 = ( mExtent.yMaximum() - y0 ) / mTileYSpan;
QgsDebugMsgLevel( QStringLiteral( "Tile range of edges [%1,%2] - [%3,%4]" ).arg( tileX1 ).arg( tileY1 ).arg( tileX2 ).arg( tileY2 ), 2 );
// figure out tile range from zoom
int startColumn = std::clamp( static_cast<int>( floor( tileX1 ) ), 0, mMatrixWidth - 1 );
int endColumn = std::clamp( static_cast<int>( floor( tileX2 ) ), 0, mMatrixWidth - 1 );
int startRow = std::clamp( static_cast<int>( floor( tileY1 ) ), 0, mMatrixHeight - 1 );
int endRow = std::clamp( static_cast<int>( floor( tileY2 ) ), 0, mMatrixHeight - 1 );
return QgsTileRange( startColumn, endColumn, startRow, endRow );
}
QPointF QgsTileMatrix::mapToTileCoordinates( const QgsPointXY &mapPoint ) const
{
double dx = mapPoint.x() - mExtent.xMinimum();
double dy = mExtent.yMaximum() - mapPoint.y();
return QPointF( dx / mTileXSpan, dy / mTileYSpan );
}
//
// QgsTileMatrixSet
//
QgsTileMatrixSet::QgsTileMatrixSet()
{
mTileAvailabilityFunction = []( QgsTileXYZ ) { return Qgis::TileAvailability::Available; };
mTileReplacementFunction = []( QgsTileXYZ id, QgsTileXYZ & replacement ) { replacement = id; return Qgis::TileAvailability::Available; };
}
bool QgsTileMatrixSet::isEmpty() const
{
return mTileMatrices.isEmpty();
}
void QgsTileMatrixSet::addGoogleCrs84QuadTiles( int minimumZoom, int maximumZoom )
{
if ( maximumZoom < minimumZoom )
std::swap( minimumZoom, maximumZoom );
for ( int zoom = minimumZoom; zoom <= maximumZoom; ++zoom )
{
addMatrix( QgsTileMatrix::fromWebMercator( zoom ) );
}
mRootMatrix = QgsTileMatrix::fromWebMercator( 0 );
}
QgsTileMatrix QgsTileMatrixSet::tileMatrix( int zoom ) const
{
return mTileMatrices.value( zoom );
}
QgsTileMatrix QgsTileMatrixSet::rootMatrix() const
{
return mRootMatrix;
}
void QgsTileMatrixSet::setRootMatrix( const QgsTileMatrix &matrix )
{
mRootMatrix = matrix;
}
void QgsTileMatrixSet::addMatrix( const QgsTileMatrix &matrix )
{
mTileMatrices.insert( matrix.zoomLevel(), matrix );
}
int QgsTileMatrixSet::minimumZoom() const
{
int res = -1;
for ( auto it = mTileMatrices.constBegin(); it != mTileMatrices.constEnd(); ++it )
{
if ( res == -1 || it->zoomLevel() < res )
res = it->zoomLevel();
}
return res;
}
int QgsTileMatrixSet::maximumZoom() const
{
int res = -1;
for ( auto it = mTileMatrices.constBegin(); it != mTileMatrices.constEnd(); ++it )
{
if ( res == -1 || it->zoomLevel() > res )
res = it->zoomLevel();
}
return res;
}
void QgsTileMatrixSet::dropMatricesOutsideZoomRange( int minimumZoom, int maximumZoom )
{
for ( auto it = mTileMatrices.begin(); it != mTileMatrices.end(); )
{
if ( it->zoomLevel() < minimumZoom || it->zoomLevel() > maximumZoom )
{
it = mTileMatrices.erase( it );
}
else
{
++it;
}
}
}
Qgis::TileAvailability QgsTileMatrixSet::tileAvailability( QgsTileXYZ id ) const
{
return mTileAvailabilityFunction( id );
}
QgsCoordinateReferenceSystem QgsTileMatrixSet::crs() const
{
if ( mTileMatrices.empty() )
return QgsCoordinateReferenceSystem();
return mTileMatrices.value( minimumZoom() ).crs();
}
double QgsTileMatrixSet::scaleToZoom( double scale ) const
{
int zoomUnder = -1;
int zoomOver = -1;
double scaleUnder = 0;
double scaleOver = 0;
switch ( mScaleToTileZoomMethod )
{
case Qgis::ScaleToTileZoomLevelMethod::MapBox:
{
// TODO: it seems that map scale is double (is that because of high-dpi screen?)
// (this TODO was taken straight from QgsVectorTileUtils::scaleToZoom!)
scale *= 2;
break;
}
case Qgis::ScaleToTileZoomLevelMethod::Esri:
break;
}
for ( auto it = mTileMatrices.constBegin(); it != mTileMatrices.constEnd(); ++it )
{
if ( it->scale() > scale && ( zoomUnder == -1 || zoomUnder < it->zoomLevel() ) )
{
zoomUnder = it->zoomLevel();
scaleUnder = it->scale();
}
if ( it->scale() < scale && ( zoomOver == -1 || zoomOver > it->zoomLevel() ) )
{
zoomOver = it->zoomLevel();
scaleOver = it->scale();
}
}
if ( zoomUnder < 0 )
return zoomOver;
if ( zoomOver < 0 )
return zoomUnder;
else
return ( scaleUnder - scale ) / ( scaleUnder - scaleOver ) * ( zoomOver - zoomUnder ) + zoomUnder;
}
int QgsTileMatrixSet::scaleToZoomLevel( double scale ) const
{
int tileZoom = 0;
switch ( mScaleToTileZoomMethod )
{
case Qgis::ScaleToTileZoomLevelMethod::MapBox:
tileZoom = static_cast<int>( round( scaleToZoom( scale ) ) );
break;
case Qgis::ScaleToTileZoomLevelMethod::Esri:
tileZoom = static_cast<int>( floor( scaleToZoom( scale ) ) );
break;
}
return std::clamp( tileZoom, minimumZoom(), maximumZoom() );
}
double QgsTileMatrixSet::scaleForRenderContext( const QgsRenderContext &context ) const
{
return calculateTileScaleForMap( context.rendererScale(),
context.coordinateTransform().destinationCrs(),
context.mapExtent(),
context.outputSize(),
context.painter()->device()->logicalDpiX() );
}
double QgsTileMatrixSet::calculateTileScaleForMap( double actualMapScale, const QgsCoordinateReferenceSystem &mapCrs, const QgsRectangle &mapExtent, const QSize mapSize, const double mapDpi ) const
{
switch ( mScaleToTileZoomMethod )
// cppcheck-suppress missingReturn
{
case Qgis::ScaleToTileZoomLevelMethod::MapBox:
return actualMapScale;
case Qgis::ScaleToTileZoomLevelMethod::Esri:
if ( mapCrs.isGeographic() )
{
// ESRI calculates the scale for geographic CRS ***ALWAYS*** at the equator, regardless of map extent!
// see https://support.esri.com/en/technical-article/000007211, https://gis.stackexchange.com/questions/33270/how-does-arcmap-calculate-scalebar-inside-a-wgs84-layout
constexpr double METERS_PER_DEGREE = M_PI / 180.0 * 6378137;
constexpr double INCHES_PER_METER = 39.370078;
const double mapWidthInches = mapExtent.width() * METERS_PER_DEGREE * INCHES_PER_METER;
double scale = mapWidthInches * mapDpi / static_cast< double >( mapSize.width() );
// Note: I **think** there's also some magic which ESRI applies when rendering tiles ON SCREEN,
// which may be something like adjusting the scale based on the ratio between the map DPI and 96 DPI,
// e.g. scale *= mapDpi / 96.0;
// BUT the same adjustment isn't applied when exporting maps. This needs further investigation!
return scale;
}
else
{
return actualMapScale;
}
}
BUILTIN_UNREACHABLE
}
bool QgsTileMatrixSet::readXml( const QDomElement &element, QgsReadWriteContext & )
{
mTileMatrices.clear();
mScaleToTileZoomMethod = qgsEnumKeyToValue( element.attribute( QStringLiteral( "scaleToZoomMethod" ) ), Qgis::ScaleToTileZoomLevelMethod::MapBox );
auto readMatrixFromElement = []( const QDomElement & matrixElement )->QgsTileMatrix
{
QgsTileMatrix matrix;
matrix.mZoomLevel = matrixElement.attribute( QStringLiteral( "zoomLevel" ) ).toInt();
matrix.mMatrixWidth = matrixElement.attribute( QStringLiteral( "matrixWidth" ) ).toInt();
matrix.mMatrixHeight = matrixElement.attribute( QStringLiteral( "matrixHeight" ) ).toInt();
matrix.mExtent = QgsRectangle(
matrixElement.attribute( QStringLiteral( "xMin" ) ).toDouble(),
matrixElement.attribute( QStringLiteral( "yMin" ) ).toDouble(),
matrixElement.attribute( QStringLiteral( "xMax" ) ).toDouble(),
matrixElement.attribute( QStringLiteral( "yMax" ) ).toDouble()
);
matrix.mScaleDenom = matrixElement.attribute( QStringLiteral( "scale" ) ).toDouble();
matrix.mTileXSpan = matrixElement.attribute( QStringLiteral( "tileXSpan" ) ).toDouble();
matrix.mTileYSpan = matrixElement.attribute( QStringLiteral( "tileYSpan" ) ).toDouble();
matrix.mCrs.readXml( matrixElement );
return matrix;
};
const QDomNodeList children = element.childNodes();
for ( int i = 0; i < children.size(); i++ )
{
const QDomElement matrixElement = children.at( i ).toElement();
if ( matrixElement.tagName() == QLatin1String( "rootMatrix" ) )
continue;
QgsTileMatrix matrix = readMatrixFromElement( matrixElement );
if ( matrix.zoomLevel() == 0 ) // old project compatibility
mRootMatrix = matrix;
addMatrix( matrix );
}
const QDomElement rootElement = element.firstChildElement( QStringLiteral( "rootMatrix" ) );
if ( !rootElement.isNull() )
{
mRootMatrix = readMatrixFromElement( rootElement );
}
return true;
}
QDomElement QgsTileMatrixSet::writeXml( QDomDocument &document, const QgsReadWriteContext & ) const
{
QDomElement setElement = document.createElement( QStringLiteral( "matrixSet" ) );
setElement.setAttribute( QStringLiteral( "scaleToZoomMethod" ), qgsEnumValueToKey( mScaleToTileZoomMethod ) );
auto writeMatrixToElement = [&document]( const QgsTileMatrix & matrix, QDomElement & matrixElement )
{
matrixElement.setAttribute( QStringLiteral( "zoomLevel" ), matrix.zoomLevel() );
matrixElement.setAttribute( QStringLiteral( "matrixWidth" ), matrix.matrixWidth() );
matrixElement.setAttribute( QStringLiteral( "matrixHeight" ), matrix.matrixHeight() );
matrixElement.setAttribute( QStringLiteral( "xMin" ), qgsDoubleToString( matrix.mExtent.xMinimum() ) );
matrixElement.setAttribute( QStringLiteral( "xMax" ), qgsDoubleToString( matrix.mExtent.xMaximum() ) );
matrixElement.setAttribute( QStringLiteral( "yMin" ), qgsDoubleToString( matrix.mExtent.yMinimum() ) );
matrixElement.setAttribute( QStringLiteral( "yMax" ), qgsDoubleToString( matrix.mExtent.yMaximum() ) );
matrixElement.setAttribute( QStringLiteral( "scale" ), qgsDoubleToString( matrix.scale() ) );
matrixElement.setAttribute( QStringLiteral( "tileXSpan" ), qgsDoubleToString( matrix.mTileXSpan ) );
matrixElement.setAttribute( QStringLiteral( "tileYSpan" ), qgsDoubleToString( matrix.mTileYSpan ) );
matrix.crs().writeXml( matrixElement, document );
};
for ( auto it = mTileMatrices.constBegin(); it != mTileMatrices.constEnd(); ++it )
{
QDomElement matrixElement = document.createElement( QStringLiteral( "matrix" ) );
writeMatrixToElement( *it, matrixElement );
setElement.appendChild( matrixElement );
}
QDomElement rootElement = document.createElement( QStringLiteral( "rootMatrix" ) );
writeMatrixToElement( mRootMatrix, rootElement );
setElement.appendChild( rootElement );
return setElement;
}
QVector<QgsTileXYZ> QgsTileMatrixSet::tilesInRange( QgsTileRange range, int zoomLevel ) const
{
QVector<QgsTileXYZ> tiles;
tiles.reserve( ( range.endColumn() - range.startColumn() + 1 ) * ( range.endRow() - range.startRow() + 1 ) );
for ( int tileRow = range.startRow(); tileRow <= range.endRow(); ++tileRow )
{
for ( int tileColumn = range.startColumn(); tileColumn <= range.endColumn(); ++tileColumn )
{
QgsTileXYZ tile( tileColumn, tileRow, zoomLevel );
QgsTileXYZ replacement;
switch ( mTileReplacementFunction( tile, replacement ) )
{
case Qgis::TileAvailability::NotAvailable:
break;
case Qgis::TileAvailability::Available:
case Qgis::TileAvailability::AvailableNoChildren:
case Qgis::TileAvailability::UseLowerZoomLevelTile:
if ( !tiles.contains( replacement ) )
tiles.append( replacement );
break;
}
}
}
return tiles;
}