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qgstilescalewidget.cpp
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qgstilescalewidget.cpp
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/***************************************************************************
qgstilescalewidget.cpp - slider to choose wms-c resolutions
-------------------
begin : 28 Mar 2010
copyright: (C) 2010 Juergen E. Fischer < jef at norbit dot de >
***************************************************************************/
/***************************************************************************
* *
* 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 "qgstilescalewidget.h"
#include "qgsmapcanvas.h"
#include "qgsrasterlayer.h"
#include "qgsmessagelog.h"
#include "qgslogger.h"
#include <QDockWidget>
#include <QMainWindow>
#include <QMenu>
#include <QGraphicsView>
QgsTileScaleWidget::QgsTileScaleWidget( QgsMapCanvas * mapCanvas, QWidget * parent, Qt::WindowFlags f )
: QWidget( parent, f )
, mMapCanvas( mapCanvas )
{
setupUi( this );
connect( mMapCanvas, SIGNAL( scaleChanged( double ) ), this, SLOT( scaleChanged( double ) ) );
layerChanged( mMapCanvas->currentLayer() );
}
QgsTileScaleWidget::~QgsTileScaleWidget()
{
}
void QgsTileScaleWidget::layerChanged( QgsMapLayer *layer )
{
mSlider->setDisabled( true );
QgsRasterLayer *rl = qobject_cast<QgsRasterLayer *>( layer );
if ( !rl || rl->providerType() != "wms" || !rl->dataProvider() )
return;
QVariant res = rl->dataProvider()->property( "resolutions" );
mResolutions.clear();
foreach ( QVariant r, res.toList() )
{
QgsDebugMsg( QString( "found resolution: %1" ).arg( r.toDouble() ) );
mResolutions << r.toDouble();
}
if ( mResolutions.size() == 0 )
return;
mSlider->setRange( 0, mResolutions.size() - 1 );
mSlider->setTickInterval( 1 );
mSlider->setInvertedAppearance( true );
mSlider->setPageStep( 1 );
mSlider->setTracking( false );
scaleChanged( mMapCanvas->scale() );
mSlider->setEnabled( true );
show();
}
void QgsTileScaleWidget::scaleChanged( double scale )
{
Q_UNUSED( scale );
if ( mResolutions.size() == 0 )
return;
double mupp = mMapCanvas->mapUnitsPerPixel();
QgsDebugMsg( QString( "resolution changed to %1" ).arg( mupp ) );
int i;
for ( i = 0; i < mResolutions.size() && mResolutions[i] < mupp; i++ )
QgsDebugMsg( QString( "test resolution %1: %2 d:%3" ).arg( i ).arg( mResolutions[i] ).arg( mupp - mResolutions[i] ) );
if ( i == mResolutions.size() ||
( i > 0 && mResolutions[i] - mupp > mupp - mResolutions[i-1] ) )
{
QgsDebugMsg( "previous resolution" );
i--;
}
QgsDebugMsg( QString( "selected resolution %1: %2" ).arg( i ).arg( mResolutions[i] ) );
mSlider->blockSignals( true );
mSlider->setValue( i );
mSlider->blockSignals( false );
}
void QgsTileScaleWidget::on_mSlider_valueChanged( int value )
{
Q_UNUSED( value );
QgsDebugMsg( QString( "slider released at %1: %2" ).arg( mSlider->value() ).arg( mResolutions[mSlider->value()] ) );
mMapCanvas->zoomByFactor( mResolutions[mSlider->value()] / mMapCanvas->mapUnitsPerPixel() );
}
void QgsTileScaleWidget::showTileScale( QMainWindow *mainWindow )
{
QDockWidget *dock = mainWindow->findChild<QDockWidget *>( "theTileScaleDock" );
if ( dock )
{
dock->setVisible( dock->isHidden() );
return;
}
QgsMapCanvas *canvas = mainWindow->findChild<QgsMapCanvas *>( "theMapCanvas" );
QgsDebugMsg( QString( "canvas:%1 [%2]" ).arg(( ulong ) canvas, 0, 16 ).arg( canvas ? canvas->objectName() : "" ) );
if ( !canvas )
{
QgsDebugMsg( "map canvas theMapCanvas not found" );
return;
}
QgsTileScaleWidget *tws = new QgsTileScaleWidget( canvas );
tws->setObjectName( "theTileScaleWidget" );
QObject *legend = mainWindow->findChild<QObject*>( "theLayerTreeView" );
if ( legend )
{
connect( legend, SIGNAL( currentLayerChanged( QgsMapLayer* ) ),
tws, SLOT( layerChanged( QgsMapLayer* ) ) );
}
else
{
QgsDebugMsg( "legend not found" );
}
//create the dock widget
dock = new QDockWidget( tr( "Tile Scale Panel" ), mainWindow );
dock->setObjectName( "theTileScaleDock" );
dock->setAllowedAreas( Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea );
mainWindow->addDockWidget( Qt::RightDockWidgetArea, dock );
// add to the Panel submenu
QMenu *panelMenu = mainWindow->findChild<QMenu *>( "mPanelMenu" );
if ( panelMenu )
{
// add to the Panel submenu
panelMenu->addAction( dock->toggleViewAction() );
}
else
{
QgsDebugMsg( "panel menu not found" );
}
dock->setWidget( tws );
connect( dock, SIGNAL( visibilityChanged( bool ) ), tws, SLOT( scaleEnabled( bool ) ) );
QSettings settings;
dock->setVisible( settings.value( "/UI/tileScaleEnabled", false ).toBool() );
}
void QgsTileScaleWidget::scaleEnabled( bool enabled )
{
QSettings settings;
settings.setValue( "/UI/tileScaleEnabled", enabled );
}