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qgsdecorationnortharrow.cpp
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qgsdecorationnortharrow.cpp
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/***************************************************************************
plugin.cpp
Import tool for various worldmap analysis output files
Functions:
-------------------
begin : Jan 21, 2004
copyright : (C) 2004 by Tim Sutton
email : tim@linfiniti.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. *
* *
***************************************************************************/
// includes
#include "qgsdecorationnortharrow.h"
#include "qgsdecorationnortharrowdialog.h"
#include "qgisapp.h"
#include "qgsbearingutils.h"
#include "qgscoordinatetransform.h"
#include "qgscsexception.h"
#include "qgslogger.h"
#include "qgsmaplayer.h"
#include "qgsproject.h"
#include "qgssvgcache.h"
// qt includes
#include <QPainter>
#include <QMenu>
#include <QDir>
#include <QFile>
#include <QSvgRenderer>
//non qt includes
#include <cmath>
#include <cassert>
// const double QgsNorthArrowPlugin::DEG2RAD = 0.0174532925199433;
const double QgsDecorationNorthArrow::TOL = 1e-8;
/**
* Constructor for the plugin. The plugin is passed a pointer to the main app
* and an interface object that provides access to exposed functions in QGIS.
* @param qgis Pointer to the QGIS main window
* @param _qI Pointer to the QGIS interface object
*/
QgsDecorationNorthArrow::QgsDecorationNorthArrow( QObject *parent )
: QgsDecorationItem( parent )
, mRotationInt( 0 )
, mAutomatic( true )
, mMarginHorizontal( 0 )
, mMarginVertical( 0 )
{
mPlacement = BottomLeft;
mMarginUnit = QgsUnitTypes::RenderMillimeters;
setName( "North Arrow" );
projectRead();
}
QgsDecorationNorthArrow::~QgsDecorationNorthArrow()
{
}
void QgsDecorationNorthArrow::projectRead()
{
QgsDecorationItem::projectRead();
mRotationInt = QgsProject::instance()->readNumEntry( mNameConfig, QStringLiteral( "/Rotation" ), 0 );
mAutomatic = QgsProject::instance()->readBoolEntry( mNameConfig, QStringLiteral( "/Automatic" ), true );
mMarginHorizontal = QgsProject::instance()->readNumEntry( mNameConfig, QStringLiteral( "/MarginH" ), 0 );
mMarginVertical = QgsProject::instance()->readNumEntry( mNameConfig, QStringLiteral( "/MarginV" ), 0 );
}
void QgsDecorationNorthArrow::saveToProject()
{
QgsDecorationItem::saveToProject();
QgsProject::instance()->writeEntry( mNameConfig, QStringLiteral( "/Rotation" ), mRotationInt );
QgsProject::instance()->writeEntry( mNameConfig, QStringLiteral( "/Automatic" ), mAutomatic );
QgsProject::instance()->writeEntry( mNameConfig, QStringLiteral( "/MarginH" ), mMarginHorizontal );
QgsProject::instance()->writeEntry( mNameConfig, QStringLiteral( "/MarginV" ), mMarginVertical );
}
// Slot called when the buffer menu item is activated
void QgsDecorationNorthArrow::run()
{
QgsDecorationNorthArrowDialog dlg( *this, QgisApp::instance() );
dlg.exec();
}
void QgsDecorationNorthArrow::render( const QgsMapSettings &mapSettings, QgsRenderContext &context )
{
//Large IF statement controlled by enable check box
if ( enabled() )
{
QSize size( 64, 64 );
QSvgRenderer svg;
const QByteArray &svgContent = QgsApplication::svgCache()->svgContent( QStringLiteral( ":/images/north_arrows/default.svg" ), size.width(), QColor( "#000000" ), QColor( "#FFFFFF" ), 0.2, 1.0 );
svg.load( svgContent );
if ( svg.isValid() )
{
double centerXDouble = size.width() / 2.0;
double centerYDouble = size.width() / 2.0;
//save the current canvas rotation
context.painter()->save();
//
//work out how to shift the image so that it rotates
// properly about its center
//(x cos a + y sin a - x, -x sin a + y cos a - y)
//
// could move this call to somewhere else so that it is only
// called when the projection or map extent changes
if ( mAutomatic )
{
mRotationInt = QgsBearingUtils:: bearingTrueNorth( mapSettings.destinationCrs(), context.extent().center() );
mRotationInt += mapSettings.rotation();
}
double myRadiansDouble = mRotationInt * M_PI / 180.0;
int xShift = static_cast<int>( (
( centerXDouble * cos( myRadiansDouble ) ) +
( centerYDouble * sin( myRadiansDouble ) )
) - centerXDouble );
int yShift = static_cast<int>( (
( -centerXDouble * sin( myRadiansDouble ) ) +
( centerYDouble * cos( myRadiansDouble ) )
) - centerYDouble );
// need width/height of paint device
int myHeight = context.painter()->device()->height();
int myWidth = context.painter()->device()->width();
//QgsDebugMsg("Rendering north arrow at " + mPlacementLabels.at(mPlacementIndex));
// Set margin according to selected units
int myXOffset = 0;
int myYOffset = 0;
switch ( mMarginUnit )
{
case QgsUnitTypes::RenderMillimeters:
{
int myPixelsInchX = context.painter()->device()->logicalDpiX();
int myPixelsInchY = context.painter()->device()->logicalDpiY();
myXOffset = myPixelsInchX * INCHES_TO_MM * mMarginHorizontal;
myYOffset = myPixelsInchY * INCHES_TO_MM * mMarginVertical;
break;
}
case QgsUnitTypes::RenderPixels:
myXOffset = mMarginHorizontal - 5; // Minus 5 to shift tight into corner
myYOffset = mMarginVertical - 5;
break;
case QgsUnitTypes::RenderPercentage:
myXOffset = ( ( myWidth - size.width() ) / 100. ) * mMarginHorizontal;
myYOffset = ( ( myHeight - size.width() ) / 100. ) * mMarginVertical;
break;
default: // Use default of top left
break;
}
//Determine placement of label from form combo box
switch ( mPlacement )
{
case BottomLeft:
context.painter()->translate( myXOffset, myHeight - myYOffset - size.width() );
break;
case TopLeft:
context.painter()->translate( myXOffset, myYOffset );
break;
case TopRight:
context.painter()->translate( myWidth - myXOffset - size.width(), myYOffset );
break;
case BottomRight:
context.painter()->translate( myWidth - myXOffset - size.width(),
myHeight - myYOffset - size.width() );
break;
default:
{
//QgsDebugMsg("Unable to determine where to put north arrow so defaulting to top left");
}
}
//rotate the canvas by the north arrow rotation amount
context.painter()->rotate( mRotationInt );
//Now we can actually do the drawing, and draw a smooth north arrow even when rotated
context.painter()->translate( xShift, yShift );
svg.render( context.painter(), QRectF( 0, 0, size.width(), size.height() ) );
//unrotate the canvas again
context.painter()->restore();
}
else
{
QFont myQFont( QStringLiteral( "time" ), 12, QFont::Bold );
context.painter()->setFont( myQFont );
context.painter()->setPen( Qt::black );
context.painter()->drawText( 10, 20, tr( "North arrow pixmap not found" ) );
}
}
}