void QgsNorthArrowPlugin::setAutomatic( bool theBool )
{
mAutomatic = theBool;
QgsProject::instance()->writeEntry( "NorthArrow", "/Automatic", mAutomatic );
if ( mAutomatic )
calculateNorthDirection();
}
void QgsNorthArrowPlugin::renderNorthArrow( QPainter * theQPainter )
{
//Large IF statement controlled by enable check box
if ( mEnable )
{
if ( theQPainter->isActive() )
{
//QgsDebugMsg("Rendering north arrow on active painter");
}
else
{
//QgsDebugMsg("Rendering north arrow on INactive painter!!!");
}
QPixmap myQPixmap; //to store the north arrow image in
QString myFileNameQString = QDir::cleanPath( QgsApplication::pkgDataPath() +
"/images/north_arrows/default.png" );
//QgsDebugMsg("Trying to load " + myFileNameQString);
if ( myQPixmap.load( myFileNameQString ) )
{
double centerXDouble = myQPixmap.width() / 2;
double centerYDouble = myQPixmap.height() / 2;
//save the current canvas rotation
theQPainter->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 )
calculateNorthDirection();
double myRadiansDouble = mRotationInt * 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 = theQPainter->device()->height();
int myWidth = theQPainter->device()->width();
//QgsDebugMsg("Rendering north arrow at " + mPlacementLabels.at(mPlacementIndex));
//Determine placement of label from form combo box
switch ( mPlacementIndex )
{
case 0: // Bottom Left
theQPainter->translate( 0, myHeight - myQPixmap.height() );
break;
case 1: // Top Left
//no need to translate for TL corner because we're already at the origin
theQPainter->translate( 0, 0 );
break;
case 2: // Top Right
theQPainter->translate( myWidth - myQPixmap.width(), 0 );
break;
case 3: // Bottom Right
theQPainter->translate( myWidth - myQPixmap.width(),
myHeight - myQPixmap.height() );
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
theQPainter->rotate( mRotationInt );
//Now we can actually do the drawing, and draw a smooth north arrow even when rotated
theQPainter->setRenderHint( QPainter::SmoothPixmapTransform );
theQPainter->drawPixmap( xShift, yShift, myQPixmap );
//unrotate the canvas again
theQPainter->restore();
}
else
{
QFont myQFont( "time", 12, QFont::Bold );
theQPainter->setFont( myQFont );
theQPainter->setPen( Qt::black );
theQPainter->drawText( 10, 20, tr( "North arrow pixmap not found" ) );
}
}
}
void QgsDecorationNorthArrow::render( QPainter * theQPainter )
{
//Large IF statement controlled by enable check box
if ( enabled() )
{
QPixmap myQPixmap; //to store the north arrow image in
QString myFileNameQString = ":/images/north_arrows/default.png";
if ( myQPixmap.load( myFileNameQString ) )
{
double centerXDouble = myQPixmap.width() / 2.0;
double centerYDouble = myQPixmap.height() / 2.0;
//save the current canvas rotation
theQPainter->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 )
calculateNorthDirection();
double myRadiansDouble = mRotationInt * 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 = theQPainter->device()->height();
int myWidth = theQPainter->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 QgsSymbolV2::MM:
{
int myPixelsInchX = theQPainter->device()->logicalDpiX();
int myPixelsInchY = theQPainter->device()->logicalDpiY();
myXOffset = myPixelsInchX * INCHES_TO_MM * mMarginHorizontal;
myYOffset = myPixelsInchY * INCHES_TO_MM * mMarginVertical;
break;
}
case QgsSymbolV2::Pixel:
myXOffset = mMarginHorizontal - 5; // Minus 5 to shift tight into corner
myYOffset = mMarginVertical - 5;
break;
case QgsSymbolV2::Percentage:
myXOffset = (( myWidth - myQPixmap.width() ) / 100. ) * mMarginHorizontal;
myYOffset = (( myHeight - myQPixmap.height() ) / 100. ) * mMarginVertical;
break;
default: // Use default of top left
break;
}
//Determine placement of label from form combo box
switch ( mPlacement )
{
case BottomLeft:
theQPainter->translate( myXOffset, myHeight - myYOffset - myQPixmap.height() );
break;
case TopLeft:
theQPainter->translate( myXOffset, myYOffset );
break;
case TopRight:
theQPainter->translate( myWidth - myXOffset - myQPixmap.width(), myYOffset );
break;
case BottomRight:
theQPainter->translate( myWidth - myXOffset - myQPixmap.width(),
myHeight - myYOffset - myQPixmap.height() );
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
theQPainter->rotate( mRotationInt );
//Now we can actually do the drawing, and draw a smooth north arrow even when rotated
theQPainter->setRenderHint( QPainter::SmoothPixmapTransform );
theQPainter->drawPixmap( xShift, yShift, myQPixmap );
//unrotate the canvas again
theQPainter->restore();
}
else
{
QFont myQFont( "time", 12, QFont::Bold );
theQPainter->setFont( myQFont );
theQPainter->setPen( Qt::black );
theQPainter->drawText( 10, 20, tr( "North arrow pixmap not found" ) );
}
}
}
