void MainWindow::addLayer()
{
QString myLayerPath = "../data";
QString myLayerBaseName = "test";
QString myProviderName = "ogr";
QgsVectorLayer * mypLayer = new QgsVectorLayer(myLayerPath, myLayerBaseName, myProviderName);
if (mypLayer->isValid())
{
qDebug("Layer is valid");
}
else
{
qDebug("Layer is NOT valid");
return;
}
//set up a renderer for the layer
QgsSingleSymbolRenderer *mypRenderer = new QgsSingleSymbolRenderer(mypLayer->geometryType());
QList<QgsMapCanvasLayer> myLayerSet;
mypLayer->setRenderer(mypRenderer);
//
//set up labelling for the layer
//
//get the label instance associated with the layer
QgsLabel * mypLabel;
mypLabel = mypLayer->label();
//and the label attributes associated with the label
QgsLabelAttributes * mypLabelAttributes;
mypLabelAttributes = mypLabel->layerAttributes();
//note in QGIS 1.4 and up you should use mypLabel->labelAttributes rather
//get the field list associated with the layer
//we'll print the names out to console for diagnostic purposes
QgsFieldMap myFields = mypLayer->dataProvider()->fields();
for (unsigned int i = 0; i < myFields.size(); i++ )
{
qDebug("Field Name: " + QString(myFields[i].name()).toLocal8Bit() );
}
//just use the last field's name in the fields list as the label field!
qDebug("set label field to " + QString(myFields[myFields.size()-1].name()).toLocal8Bit());
mypLabel->setLabelField( QgsLabel::Text, myFields.size()-1);
//set the colour of the label text
mypLabelAttributes->setColor(Qt::black);
//create a 'halo' effect around each label so it
//can still be read on dark backgrounds
mypLabelAttributes->setBufferEnabled(true);
mypLabelAttributes->setBufferColor(Qt::yellow);
int myType = QgsLabelAttributes::PointUnits;
mypLabelAttributes->setBufferSize(1,myType);
/*
* Here are a bunch of other things you can set based on values on a database field
* the second parameter in each case would be the field name from which the
* attribute can be retrieved.
mypLabel->setLabelField( QgsLabel::Family, "fontFamily" );
mypLabel->setLabelField( QgsLabel::Bold, "fontIsBold" );
mypLabel->setLabelField( QgsLabel::Italic, "fontIsItalic" );
mypLabel->setLabelField( QgsLabel::Underline, "fontIsUnderlined" );
mypLabel->setLabelField( QgsLabel::Size, "fontSize" );
mypLabel->setLabelField( QgsLabel::BufferSize,"fontBufferSize" );
mypLabel->setLabelField( QgsLabel::XCoordinate, "labelX" );
mypLabel->setLabelField( QgsLabel::YCoordinate, "labelY");
mypLabel->setLabelField( QgsLabel::XOffset, "labelXOffset");
mypLabel->setLabelField( QgsLabel::YOffset, "labelYOffset");
mypLabel->setLabelField( QgsLabel::Alignment, "labelAlignment" );
mypLabel->setLabelField( QgsLabel::Angle, "labelAngle");
*/
//lastly we enable labelling!
mypLayer->enableLabels(true);
// Add the Vector Layer to the Layer Registry
QgsMapLayerRegistry::instance()->addMapLayer(mypLayer, TRUE);
// Add the Layer to the Layer Set
myLayerSet.append(QgsMapCanvasLayer( mypLayer ) );
// set teh canvas to the extent of our layer
mpMapCanvas->setExtent(mypLayer->extent());
// Set the Map Canvas Layer Set
mpMapCanvas->setLayerSet(myLayerSet);
}
void QgsLabelDialog::apply()
{
QgsDebugMsg( "entering." );
//set the label props that are NOT bound to a field in the attributes tbl
//All of these are set in the labelAttributes member of the layer
QgsLabelAttributes * myLabelAttributes = mLabel->labelAttributes();
myLabelAttributes->setText( leDefaultLabel->text() );
myLabelAttributes->setFamily( mFont.family() );
int myTypeInt = cboFontSizeUnits->currentIndex() == 0 ? QgsLabelAttributes::PointUnits : QgsLabelAttributes::MapUnits;
myLabelAttributes->setSize( mFont.pointSizeF(), myTypeInt );
myLabelAttributes->setBold( mFont.bold() );
myLabelAttributes->setItalic( mFont.italic() );
myLabelAttributes->setUnderline( mFont.underline() );
myLabelAttributes->setStrikeOut( mFont.strikeOut() );
myLabelAttributes->setColor( mFontColor );
myTypeInt = cboOffsetUnits->currentIndex() == 0 ? QgsLabelAttributes::PointUnits : QgsLabelAttributes::MapUnits;
myLabelAttributes->setOffset( spinXOffset->value(), spinYOffset->value(), myTypeInt );
myLabelAttributes->setAutoAngle( spinAngle->value() == -1 );
myLabelAttributes->setAngle( spinAngle->value() );
//the values here may seem a bit counterintuitive - basically everything
//is the reverse of the way you think it should be...
//TODO investigate in QgsLabel why this needs to be the case
if ( radioAboveLeft->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignRight | Qt::AlignBottom );
if ( radioBelowLeft->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignRight | Qt::AlignTop );
if ( radioAboveRight->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignLeft | Qt::AlignBottom );
if ( radioBelowRight->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignLeft | Qt::AlignTop );
if ( radioLeft->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignRight | Qt::AlignVCenter );
if ( radioRight->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignLeft | Qt::AlignVCenter );
if ( radioAbove->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignBottom | Qt::AlignHCenter );
if ( radioBelow->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignTop | Qt::AlignHCenter );
if ( radioOver->isChecked() ) myLabelAttributes->setAlignment( Qt::AlignCenter );
myLabelAttributes->setMultilineEnabled( chkUseMultiline->isChecked() );
myLabelAttributes->setSelectedOnly( chkSelectedOnly->isChecked() );
myLabelAttributes->setBufferEnabled( chkUseBuffer->isChecked() );
myLabelAttributes->setBufferColor( mBufferColor );
myTypeInt = cboBufferSizeUnits->currentIndex() == 0 ? QgsLabelAttributes::PointUnits : QgsLabelAttributes::MapUnits;
myLabelAttributes->setBufferSize( spinBufferSize->value(), myTypeInt );
//TODO - transparency attributes for buffers
//set the label props that are data bound to a field in the attributes tbl
mLabel->setLabelField( QgsLabel::Text, fieldIndexFromName( cboLabelField->currentText() ) );
mLabel->setLabelField( QgsLabel::Family, fieldIndexFromName( cboFontField->currentText() ) );
mLabel->setLabelField( QgsLabel::Bold, fieldIndexFromName( cboBoldField->currentText() ) );
mLabel->setLabelField( QgsLabel::Italic, fieldIndexFromName( cboItalicField->currentText() ) );
mLabel->setLabelField( QgsLabel::Underline, fieldIndexFromName( cboUnderlineField->currentText() ) );
mLabel->setLabelField( QgsLabel::StrikeOut, fieldIndexFromName( cboStrikeOutField->currentText() ) );
mLabel->setLabelField( QgsLabel::Size, fieldIndexFromName( cboFontSizeField->currentText() ) );
mLabel->setLabelField( QgsLabel::SizeType, fieldIndexFromName( cboFontSizeTypeField->currentText() ) );
mLabel->setLabelField( QgsLabel::Color, fieldIndexFromName( cboFontColorField->currentText() ) );
mLabel->setLabelField( QgsLabel::BufferSize, fieldIndexFromName( cboBufferSizeField->currentText() ) );
//mLabel->setLabelField( QgsLabel::BufferTransparency, cboBufferTransparencyField->currentText() );
mLabel->setLabelField( QgsLabel::XCoordinate, fieldIndexFromName( cboXCoordinateField->currentText() ) );
mLabel->setLabelField( QgsLabel::YCoordinate, fieldIndexFromName( cboYCoordinateField->currentText() ) );
mLabel->setLabelField( QgsLabel::XOffset, fieldIndexFromName( cboXOffsetField->currentText() ) );
mLabel->setLabelField( QgsLabel::YOffset, fieldIndexFromName( cboYOffsetField->currentText() ) );
mLabel->setLabelField( QgsLabel::Alignment, fieldIndexFromName( cboAlignmentField->currentText() ) );
mLabel->setLabelField( QgsLabel::Angle, fieldIndexFromName( cboAngleField->currentText() ) );
// set up the scale based layer visibility stuff....
mLabel->setScaleBasedVisibility( chkUseScaleDependentRendering->isChecked() );
mLabel->setMinScale( leMinimumScale->text().toFloat() );
mLabel->setMaxScale( leMaximumScale->text().toFloat() );
}