void QgsMapRenderer::adjustExtentToSize()
{
double myHeight = mSize.height();
double myWidth = mSize.width();
QgsMapToPixel newCoordXForm;
if ( !myWidth || !myHeight )
{
mScale = 1;
newCoordXForm.setParameters( 0, 0, 0, 0 );
return;
}
// calculate the translation and scaling parameters
// mapUnitsPerPixel = map units per pixel
double mapUnitsPerPixelY = mExtent.height() / myHeight;
double mapUnitsPerPixelX = mExtent.width() / myWidth;
mMapUnitsPerPixel = mapUnitsPerPixelY > mapUnitsPerPixelX ? mapUnitsPerPixelY : mapUnitsPerPixelX;
// calculate the actual extent of the mapCanvas
double dxmin, dxmax, dymin, dymax, whitespace;
if ( mapUnitsPerPixelY > mapUnitsPerPixelX )
{
dymin = mExtent.yMinimum();
dymax = mExtent.yMaximum();
whitespace = (( myWidth * mMapUnitsPerPixel ) - mExtent.width() ) * 0.5;
dxmin = mExtent.xMinimum() - whitespace;
dxmax = mExtent.xMaximum() + whitespace;
}
else
{
dxmin = mExtent.xMinimum();
dxmax = mExtent.xMaximum();
whitespace = (( myHeight * mMapUnitsPerPixel ) - mExtent.height() ) * 0.5;
dymin = mExtent.yMinimum() - whitespace;
dymax = mExtent.yMaximum() + whitespace;
}
QgsDebugMsg( QString( "Map units per pixel (x,y) : %1, %2\n" ).arg( mapUnitsPerPixelX ).arg( mapUnitsPerPixelY ) );
QgsDebugMsg( QString( "Pixmap dimensions (x,y) : %1, %2\n" ).arg( myWidth ).arg( myHeight ) );
QgsDebugMsg( QString( "Extent dimensions (x,y) : %1, %2\n" ).arg( mExtent.width() ).arg( mExtent.height() ) );
QgsDebugMsg( mExtent.toString() );
// update extent
mExtent.setXMinimum( dxmin );
mExtent.setXMaximum( dxmax );
mExtent.setYMinimum( dymin );
mExtent.setYMaximum( dymax );
// update the scale
updateScale();
QgsDebugMsg( QString( "Scale (assuming meters as map units) = 1:%1" ).arg( mScale ) );
newCoordXForm.setParameters( mMapUnitsPerPixel, dxmin, dymin, myHeight );
mRenderContext.setMapToPixel( newCoordXForm );
mRenderContext.setExtent( mExtent );
}
QgsLabelPreview::QgsLabelPreview( QWidget* parent )
: QLabel( parent )
{
mTmpLyr = new QgsPalLayerSettings();
// construct a device-based render context
QgsMapToPixel newCoordXForm;
newCoordXForm.setParameters( 0, 0, 0, 0 );
mContext = new QgsRenderContext();
mContext->setMapToPixel( newCoordXForm );
}
QPixmap QgsFontButton::createDragIcon( QSize size, const QgsTextFormat *tempFormat, const QFont *tempFont ) const
{
if ( !tempFormat )
tempFormat = &mFormat;
if ( !tempFont )
tempFont = &mFont;
//create an icon pixmap
QPixmap pixmap( size.width(), size.height() );
pixmap.fill( Qt::transparent );
QPainter p;
p.begin( &pixmap );
p.setRenderHint( QPainter::Antialiasing );
QRect rect( 0, 0, size.width(), size.height() );
if ( mMode == ModeQFont || tempFormat->color().lightnessF() < 0.7 )
{
p.setBrush( QBrush( QColor( 255, 255, 255 ) ) );
p.setPen( QPen( QColor( 150, 150, 150 ), 0 ) );
}
else
{
p.setBrush( QBrush( QColor( 0, 0, 0 ) ) );
p.setPen( QPen( QColor( 100, 100, 100 ), 0 ) );
}
p.drawRect( rect );
p.setBrush( Qt::NoBrush );
p.setPen( Qt::NoPen );
switch ( mMode )
{
case ModeTextRenderer:
{
QgsRenderContext context;
QgsMapToPixel newCoordXForm;
newCoordXForm.setParameters( 1, 0, 0, 0, 0, 0 );
context.setMapToPixel( newCoordXForm );
context.setScaleFactor( QgsApplication::desktop()->logicalDpiX() / 25.4 );
context.setUseAdvancedEffects( true );
context.setPainter( &p );
// slightly inset text to account for buffer/background
double xtrans = 0;
if ( tempFormat->buffer().enabled() )
xtrans = context.convertToPainterUnits( tempFormat->buffer().size(), tempFormat->buffer().sizeUnit(), tempFormat->buffer().sizeMapUnitScale() );
if ( tempFormat->background().enabled() && tempFormat->background().sizeType() != QgsTextBackgroundSettings::SizeFixed )
xtrans = std::max( xtrans, context.convertToPainterUnits( tempFormat->background().size().width(), tempFormat->background().sizeUnit(), tempFormat->background().sizeMapUnitScale() ) );
double ytrans = 0.0;
if ( tempFormat->buffer().enabled() )
ytrans = std::max( ytrans, context.convertToPainterUnits( tempFormat->buffer().size(), tempFormat->buffer().sizeUnit(), tempFormat->buffer().sizeMapUnitScale() ) );
if ( tempFormat->background().enabled() )
ytrans = std::max( ytrans, context.convertToPainterUnits( tempFormat->background().size().height(), tempFormat->background().sizeUnit(), tempFormat->background().sizeMapUnitScale() ) );
QRectF textRect = rect;
textRect.setLeft( xtrans );
textRect.setWidth( textRect.width() - xtrans );
textRect.setTop( ytrans );
if ( textRect.height() > 300 )
textRect.setHeight( 300 );
if ( textRect.width() > 2000 )
textRect.setWidth( 2000 );
QgsTextRenderer::drawText( textRect, 0, QgsTextRenderer::AlignCenter, QStringList() << tr( "Aa" ),
context, *tempFormat );
break;
}
case ModeQFont:
{
p.setBrush( Qt::NoBrush );
p.setPen( QColor( 0, 0, 0 ) );
p.setFont( *tempFont );
QRectF textRect = rect;
textRect.setLeft( 2 );
p.drawText( textRect, Qt::AlignVCenter, tr( "Aa" ) );
break;
}
}
p.end();
return pixmap;
}