/
qgslabel.cpp
1416 lines (1243 loc) · 34.3 KB
/
qgslabel.cpp
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/***************************************************************************
qgslabel.cpp - render vector labels
-------------------
begin : August 2004
copyright : (C) 2004 by Radim Blazek
email : blazek@itc.it
***************************************************************************/
/***************************************************************************
* *
* 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 <cmath>
#include <limits>
#include <QString>
#include <QFont>
#include <QFontMetrics>
#include <QPainter>
#include <QDomNode>
#include <QDomElement>
#include "qgis.h"
#include "qgsfeature.h"
#include "qgsgeometry.h"
#include "qgsfield.h"
#include "qgslogger.h"
#include "qgsrectangle.h"
#include "qgsmaptopixel.h"
#include "qgscoordinatetransform.h"
#include "qgsrendercontext.h"
#include "qgslabelattributes.h"
#include "qgslabel.h"
// use M_PI define PI 3.141592654
#ifdef WIN32
#undef M_PI
#define M_PI 4*atan(1.0)
#endif
static const char * const ident_ =
"$Id$";
QgsLabel::QgsLabel( const QgsFieldMap & fields )
: mMinScale( 0 ),
mMaxScale( 100000000 ),
mScaleBasedVisibility( false )
{
mField = fields;
mLabelFieldIdx.resize( LabelFieldCount );
for ( int i = 0; i < LabelFieldCount; i++ )
{
mLabelFieldIdx[i] = -1;
}
mLabelAttributes = new QgsLabelAttributes( true );
}
QgsLabel::~QgsLabel()
{
delete mLabelAttributes;
}
QString QgsLabel::fieldValue( int attr, QgsFeature &feature )
{
if ( mLabelFieldIdx[attr] == -1 )
{
return QString();
}
const QgsAttributeMap& attrs = feature.attributeMap();
QgsAttributeMap::const_iterator it = attrs.find( mLabelFieldIdx[attr] );
if ( it != attrs.end() )
{
return it->toString();
}
else
{
return QString();
}
}
void QgsLabel::renderLabel( QgsRenderContext &renderContext,
QgsFeature &feature, bool selected,
QgsLabelAttributes *classAttributes )
{
if ( mLabelAttributes->selectedOnly() && !selected )
return;
QPen pen;
QFont font;
QString value;
QString text;
/* Calc scale (not nice) */
QgsPoint point;
point = renderContext.mapToPixel().transform( 0, 0 );
double x1 = point.x();
point = renderContext.mapToPixel().transform( 1000, 0 );
double x2 = point.x();
double scale = ( x2 - x1 ) * 0.001;
/* Text */
value = fieldValue( Text, feature );
if ( value.isEmpty() )
{
text = mLabelAttributes->text();
}
else
{
text = value;
}
/* Font */
value = fieldValue( Family, feature );
if ( value.isEmpty() )
{
font.setFamily( mLabelAttributes->family() );
}
else
{
font.setFamily( value );
}
double size;
value = fieldValue( Size, feature );
if ( value.isEmpty() )
{
size = mLabelAttributes->size();
}
else
{
size = value.toDouble();
}
int sizeType;
value = fieldValue( SizeType, feature );
if ( value.isEmpty() )
sizeType = mLabelAttributes->sizeType();
else
{
value = value.toLower();
if ( value.compare( "mapunits" ) == 0 )
sizeType = QgsLabelAttributes::MapUnits;
else
sizeType = QgsLabelAttributes::PointUnits;
}
if ( sizeType == QgsLabelAttributes::MapUnits )
{
size *= scale;
}
else //point units
{
double sizeMM = size * 0.3527;
size = sizeMM * renderContext.scaleFactor();
}
//Request font larger (multiplied by rasterScaleFactor) as a workaround for the Qt font bug
//and scale the painter down by rasterScaleFactor when drawing the label
size *= renderContext.rasterScaleFactor();
if (( int )size <= 0 )
// skip too small labels
return;
font.setPixelSize( size );
value = fieldValue( Color, feature );
if ( value.isEmpty() )
{
pen.setColor( mLabelAttributes->color() );
}
else
{
pen.setColor( QColor( value ) );
}
value = fieldValue( Bold, feature );
if ( value.isEmpty() )
{
font.setBold( mLabelAttributes->bold() );
}
else
{
font.setBold(( bool ) value.toInt() );
}
value = fieldValue( Italic, feature );
if ( value.isEmpty() )
{
font.setItalic( mLabelAttributes->italic() );
}
else
{
font.setItalic(( bool ) value.toInt() );
}
value = fieldValue( Underline, feature );
if ( value.isEmpty() )
{
font.setUnderline( mLabelAttributes->underline() );
}
else
{
font.setUnderline(( bool ) value.toInt() );
}
value = fieldValue( StrikeOut, feature );
if ( value.isEmpty() )
{
font.setStrikeOut( mLabelAttributes->strikeOut() );
}
else
{
font.setStrikeOut(( bool ) value.toInt() );
}
//
QgsPoint overridePoint;
bool useOverridePoint = false;
value = fieldValue( XCoordinate, feature );
if ( !value.isEmpty() )
{
overridePoint.setX( value.toDouble() );
useOverridePoint = true;
}
value = fieldValue( YCoordinate, feature );
if ( !value.isEmpty() )
{
overridePoint.setY( value.toDouble() );
useOverridePoint = true;
}
/* Alignment */
int alignment;
QFontMetrics fm( font );
int width, height;
if ( mLabelAttributes->multilineEnabled() )
{
QStringList texts = text.split( "\n" );
width = 0;
for ( int i = 0; i < texts.size(); i++ )
{
int w = fm.width( texts[i] );
if ( w > width )
width = w;
}
height = fm.height() * texts.size();
}
else
{
width = fm.width( text );
height = fm.height();
}
int dx = 0;
int dy = 0;
value = fieldValue( Alignment, feature );
if ( value.isEmpty() )
{
alignment = mLabelAttributes->alignment();
}
else
{
value = value.toLower();
alignment = 0;
if ( value.contains( "left" ) )
alignment |= Qt::AlignLeft;
else if ( value.contains( "right" ) )
alignment |= Qt::AlignRight;
else
alignment |= Qt::AlignHCenter;
if ( value.contains( "bottom" ) )
alignment |= Qt::AlignBottom;
else if ( value.contains( "top" ) )
alignment |= Qt::AlignTop;
else
alignment |= Qt::AlignVCenter;
}
if ( alignment & Qt::AlignLeft )
{
dx = 0;
}
else if ( alignment & Qt::AlignHCenter )
{
dx = -width / 2;
}
else if ( alignment & Qt::AlignRight )
{
dx = -width;
}
if ( alignment & Qt::AlignBottom )
{
dy = 0;
}
else if ( alignment & Qt::AlignVCenter )
{
dy = height / 2;
}
else if ( alignment & Qt::AlignTop )
{
dy = height;
}
// Offset
double xoffset, yoffset;
value = fieldValue( XOffset, feature );
if ( value.isEmpty() )
{
xoffset = mLabelAttributes->xOffset();
}
else
{
xoffset = value.toDouble();
}
value = fieldValue( YOffset, feature );
if ( value.isEmpty() )
{
yoffset = mLabelAttributes->yOffset();
}
else
{
yoffset = value.toDouble();
}
// recalc offset to pixels
if ( mLabelAttributes->offsetType() == QgsLabelAttributes::MapUnits )
{
xoffset *= scale;
yoffset *= scale;
}
else
{
xoffset = xoffset * 0.3527 * renderContext.scaleFactor();
yoffset = yoffset * 0.3527 * renderContext.scaleFactor();
}
// Angle
double ang;
value = fieldValue( Angle, feature );
if ( value.isEmpty() )
{
ang = mLabelAttributes->angle();
}
else
{
ang = value.toDouble();
}
// Work out a suitable position to put the label for the
// feature. For multi-geometries, put the same label on each
// part.
if ( useOverridePoint )
{
renderLabel( renderContext, overridePoint, text, font, pen, dx, dy,
xoffset, yoffset, ang, width, height, alignment );
}
else
{
std::vector<labelpoint> points;
labelPoint( points, feature );
for ( uint i = 0; i < points.size(); ++i )
{
renderLabel( renderContext, points[i].p, text, font, pen, dx, dy,
xoffset, yoffset, mLabelAttributes->angleIsAuto() ? points[i].angle : ang, width, height, alignment );
}
}
}
void QgsLabel::renderLabel( QgsRenderContext &renderContext,
QgsPoint point,
QString text, QFont font, QPen pen,
int dx, int dy,
double xoffset, double yoffset,
double ang,
int width, int height, int alignment )
{
QPainter *painter = renderContext.painter();
// Convert point to projected units
if ( renderContext.coordinateTransform() )
{
try
{
point = renderContext.coordinateTransform()->transform( point );
}
catch ( QgsCsException &cse )
{
Q_UNUSED( cse ); // unused otherwise
QgsDebugMsg( "Caught transform error. Skipping rendering this label" );
return;
}
}
// and then to canvas units
renderContext.mapToPixel().transform( &point );
double x = point.x();
double y = point.y();
double rad = ang * M_PI / 180;
x = x + xoffset * cos( rad ) - yoffset * sin( rad );
y = y - xoffset * sin( rad ) - yoffset * cos( rad );
painter->save();
painter->setFont( font );
painter->translate( x, y );
//correct oversampled font size back by scaling painter down
painter->scale( 1.0 / renderContext.rasterScaleFactor(), 1.0 / renderContext.rasterScaleFactor() );
painter->rotate( -ang );
//
// Draw a buffer behind the text if one is desired
//
if ( mLabelAttributes->bufferSizeIsSet() && mLabelAttributes->bufferEnabled() )
{
double myBufferSize = mLabelAttributes->bufferSize() * 0.3527 * renderContext.scaleFactor() * renderContext.rasterScaleFactor();
QPen bufferPen;
if ( mLabelAttributes->bufferColorIsSet() )
{
bufferPen.setColor( mLabelAttributes->bufferColor() );
}
else //default to a white buffer
{
bufferPen.setColor( Qt::white );
}
painter->setPen( bufferPen );
double bufferStepSize; //hack to distinguish pixel devices from logical devices
if (( renderContext.scaleFactor() - 1 ) > 1.5 )
{
bufferStepSize = 1;
}
else //draw more dense in case of logical devices
{
bufferStepSize = 1 / renderContext.rasterScaleFactor();
}
for ( double i = dx - myBufferSize; i <= dx + myBufferSize; i += bufferStepSize )
{
for ( double j = dy - myBufferSize; j <= dy + myBufferSize; j += bufferStepSize )
{
if ( mLabelAttributes->multilineEnabled() )
painter->drawText( QRectF( i, j - height, width, height ), alignment, text );
else
painter->drawText( QPointF( i, j ), text );
}
}
}
painter->setPen( pen );
if ( mLabelAttributes->multilineEnabled() )
painter->drawText( dx, dy - height, width, height, alignment, text );
else
painter->drawText( dx, dy, text );
painter->restore();
}
void QgsLabel::addRequiredFields( QgsAttributeList& fields ) const
{
for ( uint i = 0; i < LabelFieldCount; i++ )
{
if ( mLabelFieldIdx[i] == -1 )
continue;
bool found = false;
for ( QgsAttributeList::iterator it = fields.begin(); it != fields.end(); ++it )
{
if ( *it == mLabelFieldIdx[i] )
{
found = true;
break;
}
}
if ( !found )
{
fields.append( mLabelFieldIdx[i] );
}
}
}
void QgsLabel::setFields( const QgsFieldMap & fields )
{
mField = fields;
}
QgsFieldMap & QgsLabel::fields( void )
{
return mField;
}
void QgsLabel::setLabelField( int attr, int fieldIndex )
{
if ( attr >= LabelFieldCount )
return;
mLabelFieldIdx[attr] = fieldIndex;
}
QString QgsLabel::labelField( int attr ) const
{
if ( attr > LabelFieldCount )
return QString();
int fieldIndex = mLabelFieldIdx[attr];
return mField[fieldIndex].name();
}
QgsLabelAttributes *QgsLabel::labelAttributes( void )
{
return mLabelAttributes;
}
// @note this will be deprecated use attributes rather
QgsLabelAttributes *QgsLabel::layerAttributes( void )
{
return mLabelAttributes;
}
void QgsLabel::labelPoint( std::vector<labelpoint>& points, QgsFeature & feature )
{
QgsGeometry *geometry = feature.geometry();
unsigned char *geom = geometry->asWkb();
size_t geomlen = geometry->wkbSize();
QGis::WkbType wkbType = geometry->wkbType();
labelpoint point;
switch ( wkbType )
{
case QGis::WKBPoint25D:
case QGis::WKBPoint:
case QGis::WKBLineString25D:
case QGis::WKBLineString:
case QGis::WKBPolygon25D:
case QGis::WKBPolygon:
{
labelPoint( point, geom, geomlen );
points.push_back( point );
}
break;
case QGis::WKBMultiPoint25D:
case QGis::WKBMultiPoint:
case QGis::WKBMultiLineString25D:
case QGis::WKBMultiLineString:
case QGis::WKBMultiPolygon25D:
case QGis::WKBMultiPolygon:
// Return a position for each individual in the multi-feature
{
Q_ASSERT( 1 + sizeof( wkbType ) + sizeof( int ) <= geomlen );
geom += 1 + sizeof( wkbType );
int nFeatures = *( unsigned int * )geom;
geom += sizeof( int );
unsigned char *feature = geom;
for ( int i = 0; i < nFeatures && feature; ++i )
{
feature = labelPoint( point, feature, geom + geomlen - feature );
points.push_back( point );
}
}
break;
default:
QgsDebugMsg( "Unknown geometry type of " + QString::number( wkbType ) );
}
}
unsigned char* QgsLabel::labelPoint( labelpoint& point, unsigned char *geom, size_t geomlen )
{
// verify that local types match sizes as WKB spec
Q_ASSERT( sizeof( int ) == 4 );
Q_ASSERT( sizeof( QGis::WkbType ) == 4 );
Q_ASSERT( sizeof( double ) == 8 );
if ( geom == NULL )
{
QgsDebugMsg( "empty wkb" );
return NULL;
}
QGis::WkbType wkbType;
#ifndef QT_NO_DEBUG
unsigned char *geomend = geom + geomlen;
#endif
Q_ASSERT( geom + 1 + sizeof( wkbType ) <= geomend );
geom++; // skip endianness
memcpy( &wkbType, geom, sizeof( wkbType ) );
geom += sizeof( wkbType );
int dims = 2;
switch ( wkbType )
{
case QGis::WKBPoint25D:
case QGis::WKBPoint:
{
Q_ASSERT( geom + 2*sizeof( double ) <= geomend );
double *pts = ( double * )geom;
point.p.set( pts[0], pts[1] );
point.angle = 0.0;
geom += 2 * sizeof( double );
}
break;
case QGis::WKBLineString25D:
dims = 3;
case QGis::WKBLineString: // Line center
{
Q_ASSERT( geom + sizeof( int ) <= geomend );
int nPoints = *( unsigned int * )geom;
geom += sizeof( int );
Q_ASSERT( geom + nPoints*sizeof( double )*dims <= geomend );
// get line center
double *pts = ( double * )geom;
double tl = 0.0;
for ( int i = 1; i < nPoints; i++ )
{
double dx = pts[dims*i] - pts[dims*( i-1 )];
double dy = pts[dims*i+1] - pts[dims*( i-1 )+1];
tl += sqrt( dx * dx + dy * dy );
}
tl /= 2.0;
// find line center
double l = 0.0;
for ( int i = 1; i < nPoints; i++ )
{
double dx = pts[dims*i] - pts[dims*( i-1 )];
double dy = pts[dims*i+1] - pts[dims*( i-1 )+1];
double dl = sqrt( dx * dx + dy * dy );
if ( l + dl > tl )
{
double k = ( tl - l ) / dl;
point.p.set( pts[dims*( i-1 )] + k * dx,
pts[dims*( i-1 )+1] + k * dy );
point.angle = atan2( dy, dx ) * 180.0 * M_1_PI;
break;
}
l += dl;
}
geom += nPoints * sizeof( double ) * dims;
}
break;
case QGis::WKBPolygon25D:
dims = 3;
case QGis::WKBPolygon: // centroid of outer ring
{
Q_ASSERT( geom + sizeof( int ) <= geomend );
int nRings = *( unsigned int * )geom;
geom += sizeof( int );
for ( int i = 0; i < nRings; ++i )
{
Q_ASSERT( geom + sizeof( int ) <= geomend );
int nPoints = *( unsigned int * )geom;
geom += sizeof( int );
Q_ASSERT( geom + nPoints*sizeof( double )*dims <= geomend );
if ( i == 0 )
{
double sx = 0.0, sy = 0.0;
double *pts = ( double* ) geom;
for ( int j = 0; j < nPoints - 1; j++ )
{
sx += pts[dims*j];
sy += pts[dims*j+1];
}
point.p.set( sx / ( nPoints - 1 ),
sy / ( nPoints - 1 ) );
point.angle = 0.0;
}
geom += nPoints * sizeof( double ) * dims;
}
}
break;
default:
// To get here is a bug because our caller should be filtering
// on wkb type.
QgsDebugMsg( "unsupported wkb type" );
return NULL;
}
return geom;
}
bool QgsLabel::readLabelField( QDomElement &el, int attr, QString prefix = "field" )
{
QString name = prefix + "name";
if ( el.hasAttribute( name ) )
{
name = el.attribute( name );
QgsFieldMap::const_iterator field_it = mField.constBegin();
for ( ; field_it != mField.constEnd(); ++field_it )
{
if ( field_it.value().name() == name )
{
break;
}
}
if ( field_it != mField.constEnd() )
{
mLabelFieldIdx[attr] = field_it.key();
return true;
}
}
else if ( el.hasAttribute( prefix ) )
{
QString value = el.attribute( prefix );
mLabelFieldIdx[attr] = value.isEmpty() ? -1 : value.toInt();
return true;
}
mLabelFieldIdx[attr] = -1;
return false;
}
void QgsLabel::readXML( const QDomNode& node )
{
QgsDebugMsg( " called for layer label properties, got node " + node.nodeName() );
QDomNode scratchNode; // Dom node re-used to get current QgsLabel attribute
QDomElement el;
int red, green, blue;
int type;
/* Text */
scratchNode = node.namedItem( "label" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``label'' attribute" );
}
else
{
el = scratchNode.toElement();
mLabelAttributes->setText( el.attribute( "text", "" ) );
readLabelField( el, Text );
}
/* Family */
scratchNode = node.namedItem( "family" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``family'' attribute" );
}
else
{
el = scratchNode.toElement();
mLabelAttributes->setFamily( el.attribute( "name", "" ) );
readLabelField( el, Family );
}
/* Size */
scratchNode = node.namedItem( "size" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``size'' attribute" );
}
else
{
el = scratchNode.toElement();
if ( !el.hasAttribute( "unitfield" ) && !el.hasAttribute( "unitfieldname" ) )
{
type = QgsLabelAttributes::unitsCode( el.attribute( "units", "" ) );
mLabelAttributes->setSize( el.attribute( "value", "0.0" ).toDouble(), type );
}
else
{
readLabelField( el, SizeType, "unitfield" );
}
readLabelField( el, Size );
}
/* Bold */
scratchNode = node.namedItem( "bold" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``bold'' attribute" );
}
else
{
el = scratchNode.toElement();
mLabelAttributes->setBold(( bool )el.attribute( "on", "0" ).toInt() );
readLabelField( el, Bold );
}
/* Italic */
scratchNode = node.namedItem( "italic" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``italic'' attribute" );
}
else
{
el = scratchNode.toElement();
mLabelAttributes->setItalic(( bool )el.attribute( "on", "0" ).toInt() );
readLabelField( el, Italic );
}
/* Underline */
scratchNode = node.namedItem( "underline" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``underline'' attribute" );
}
else
{
el = scratchNode.toElement();
mLabelAttributes->setUnderline(( bool )el.attribute( "on", "0" ).toInt() );
readLabelField( el, Underline );
}
/* Strikeout */
scratchNode = node.namedItem( "strikeout" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``strikeout'' attribute" );
}
else
{
el = scratchNode.toElement();
mLabelAttributes->setStrikeOut(( bool )el.attribute( "on", "0" ).toInt() );
readLabelField( el, StrikeOut );
}
/* Color */
scratchNode = node.namedItem( "color" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``color'' attribute" );
}
else
{
el = scratchNode.toElement();
red = el.attribute( "red", "0" ).toInt();
green = el.attribute( "green", "0" ).toInt();
blue = el.attribute( "blue", "0" ).toInt();
mLabelAttributes->setColor( QColor( red, green, blue ) );
readLabelField( el, Color );
}
/* X */
scratchNode = node.namedItem( "x" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``x'' attribute" );
}
else
{
el = scratchNode.toElement();
readLabelField( el, XCoordinate );
}
/* Y */
scratchNode = node.namedItem( "y" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``y'' attribute" );
}
else
{
el = scratchNode.toElement();
readLabelField( el, YCoordinate );
}
/* X,Y offset */
scratchNode = node.namedItem( "offset" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``offset'' attribute" );
}
else
{
double xoffset, yoffset;
el = scratchNode.toElement();
type = QgsLabelAttributes::unitsCode( el.attribute( "units", "" ) );
xoffset = el.attribute( "x", "0.0" ).toDouble();
yoffset = el.attribute( "y", "0.0" ).toDouble();
mLabelAttributes->setOffset( xoffset, yoffset, type );
readLabelField( el, XOffset, "xfield" );
readLabelField( el, YOffset, "yfield" );
}
/* Angle */
scratchNode = node.namedItem( "angle" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``angle'' attribute" );
}
else
{
el = scratchNode.toElement();
mLabelAttributes->setAngle( el.attribute( "value", "0.0" ).toDouble() );
readLabelField( el, Angle );
mLabelAttributes->setAutoAngle( el.attribute( "auto", "0" ) == "1" );
}
/* Alignment */
scratchNode = node.namedItem( "alignment" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``alignment'' attribute" );
}
else
{
el = scratchNode.toElement();
mLabelAttributes->setAlignment( QgsLabelAttributes::alignmentCode( el.attribute( "value", "" ) ) );
readLabelField( el, Alignment );
}
// Buffer
scratchNode = node.namedItem( "buffercolor" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``buffercolor'' attribute" );
}
else
{
el = scratchNode.toElement();
red = el.attribute( "red", "0" ).toInt();
green = el.attribute( "green", "0" ).toInt();
blue = el.attribute( "blue", "0" ).toInt();
mLabelAttributes->setBufferColor( QColor( red, green, blue ) );
readLabelField( el, BufferColor );
}
scratchNode = node.namedItem( "buffersize" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``bffersize'' attribute" );
}
else
{
el = scratchNode.toElement();
type = QgsLabelAttributes::unitsCode( el.attribute( "units", "" ) );
mLabelAttributes->setBufferSize( el.attribute( "value", "0.0" ).toDouble(), type );
readLabelField( el, BufferSize );
}
scratchNode = node.namedItem( "bufferenabled" );
if ( scratchNode.isNull() )
{
QgsDebugMsg( "couldn't find QgsLabel ``bufferenabled'' attribute" );
}
else