16 #include <QRegularExpression> 34 values.reserve( classes.count() );
35 for (
int i = 0 ; i < classes.count(); i++ )
36 values << classes.at( i ).upperBound();
41 : mFlags( properties )
42 , mCodeComplexity( codeComplexity )
43 , mLabelFormat( QStringLiteral(
"%1 - %2" ) )
49 qDeleteAll( mParameters );
63 const QString methodId = element.attribute( QStringLiteral(
"id" ) );
67 QDomElement symmetricModeElem = element.firstChildElement( QStringLiteral(
"symmetricMode" ) );
68 if ( !symmetricModeElem.isNull() )
70 bool symmetricEnabled = symmetricModeElem.attribute( QStringLiteral(
"enabled" ) ).toInt() == 1;
71 double symmetricPoint = symmetricModeElem.attribute( QStringLiteral(
"symmetrypoint" ) ).toDouble();
72 bool astride = symmetricModeElem.attribute( QStringLiteral(
"astride" ) ).toInt() == 1;
77 QDomElement labelFormatElem = element.firstChildElement( QStringLiteral(
"labelformat" ) );
78 if ( !labelFormatElem.isNull() )
80 QString format = labelFormatElem.attribute( QStringLiteral(
"format" ),
"%1" + QStringLiteral(
" - " ) +
"%2" );
81 int precision = labelFormatElem.attribute( QStringLiteral(
"labelprecision" ), QStringLiteral(
"4" ) ).toInt();
82 bool trimTrailingZeroes = labelFormatElem.attribute( QStringLiteral(
"trimtrailingzeroes" ), QStringLiteral(
"false" ) ) == QLatin1String(
"true" );
89 QDomElement parametersElem = element.firstChildElement( QStringLiteral(
"parameters" ) );
94 QDomElement extraElem = element.firstChildElement( QStringLiteral(
"extraInformation" ) );
95 if ( !extraElem.isNull() )
96 method->
readXml( extraElem, context );
103 QDomElement methodElem = doc.createElement( QStringLiteral(
"classificationMethod" ) );
105 methodElem.setAttribute( QStringLiteral(
"id" ),
id() );
108 QDomElement symmetricModeElem = doc.createElement( QStringLiteral(
"symmetricMode" ) );
110 symmetricModeElem.setAttribute( QStringLiteral(
"symmetrypoint" ),
symmetryPoint() );
111 symmetricModeElem.setAttribute( QStringLiteral(
"astride" ), mSymmetryAstride ? 1 : 0 );
112 methodElem.appendChild( symmetricModeElem );
115 QDomElement labelFormatElem = doc.createElement( QStringLiteral(
"labelFormat" ) );
116 labelFormatElem.setAttribute( QStringLiteral(
"format" ),
labelFormat() );
117 labelFormatElem.setAttribute( QStringLiteral(
"labelprecision" ),
labelPrecision() );
119 methodElem.appendChild( labelFormatElem );
122 QDomElement parametersElem = doc.createElement( QStringLiteral(
"parameters" ) );
124 methodElem.appendChild( parametersElem );
127 QDomElement extraElem = doc.createElement( QStringLiteral(
"extraInformation" ) );
129 methodElem.appendChild( extraElem );
137 mSymmetricEnabled = enabled;
139 mSymmetryAstride = astride;
147 mLabelNumberScale = 1.0;
148 mLabelNumberSuffix.clear();
149 while ( precision < 0 )
152 mLabelNumberScale /= 10.0;
153 mLabelNumberSuffix.append(
'0' );
159 static const QRegularExpression RE_TRAILING_ZEROES = QRegularExpression(
"[.,]?0*$" );
160 static const QRegularExpression RE_NEGATIVE_ZERO = QRegularExpression(
"^\\-0(?:[.,]0*)?$" );
161 if ( mLabelPrecision > 0 )
163 QString valueStr = QLocale().toString( value,
'f', mLabelPrecision );
164 if ( mLabelTrimTrailingZeroes )
165 valueStr = valueStr.remove( RE_TRAILING_ZEROES );
166 if ( RE_NEGATIVE_ZERO.match( valueStr ).hasMatch() )
167 valueStr = valueStr.mid( 1 );
172 QString valueStr = QLocale().toString( value * mLabelNumberScale,
'f', 0 );
173 if ( valueStr == QLatin1String(
"-0" ) )
175 if ( valueStr != QLatin1String(
"0" ) )
176 valueStr = valueStr + mLabelNumberSuffix;
183 mParameters.append( definition );
190 if ( def->name() == parameterName )
199 mParameterValues = values;
200 for (
auto it = mParameterValues.constBegin(); it != mParameterValues.constEnd(); ++it )
211 if ( expression.isEmpty() )
212 return QList<QgsClassificationRange>();
217 QList<double> values;
228 if ( !ok || values.isEmpty() )
229 return QList<QgsClassificationRange>();
231 auto result = std::minmax_element( values.begin(), values.end() );
232 minimum = *result.first;
233 maximum = *result.second;
242 QList<double> breaks = calculateBreaks( minimum, maximum, values, nclasses );
243 breaks.insert( 0, minimum );
245 return breaksToClasses( breaks );
250 auto result = std::minmax_element( values.begin(), values.end() );
251 double minimum = *result.first;
252 double maximum = *result.second;
255 QList<double> breaks = calculateBreaks( minimum, maximum, values, nclasses );
256 breaks.insert( 0, minimum );
258 return breaksToClasses( breaks );
265 QgsDebugMsg( QStringLiteral(
"The classification method %1 tries to calculate classes without values while they are required." ).arg(
name() ) );
269 QList<double> breaks = calculateBreaks( minimum, maximum, QList<double>(), nclasses );
270 breaks.insert( 0, minimum );
272 return breaksToClasses( breaks );
275 QList<QgsClassificationRange> QgsClassificationMethod::breaksToClasses(
const QList<double> &breaks )
const 277 QList<QgsClassificationRange>
classes;
279 for (
int i = 1; i < breaks.count(); i++ )
282 const double lowerValue = breaks.at( i - 1 );
283 const double upperValue = breaks.at( i );
288 else if ( i == breaks.count() - 1 )
291 QString label =
labelForRange( lowerValue, upperValue, pos );
305 if ( breaks.count() < 2 )
308 std::sort( breaks.begin(), breaks.end() );
310 double distBelowSymmetricValue = std::fabs( breaks[0] - symmetryPoint );
311 double distAboveSymmetricValue = std::fabs( breaks[ breaks.size() - 2 ] -
symmetryPoint ) ;
312 double absMin = std::min( distAboveSymmetricValue, distBelowSymmetricValue );
315 for (
int i = 0; i <= breaks.size() - 2; ++i )
318 if ( std::fabs( breaks.at( i ) -
symmetryPoint ) >= ( absMin - std::fabs( breaks[0] - breaks[1] ) / 100. ) )
320 breaks.removeAt( i );
327 breaks.removeAt( breaks.indexOf( symmetryPoint ) );
340 const QString lowerLabel = valueToLabel( lowerValue );
341 const QString upperLabel = valueToLabel( upperValue );
343 return labelFormat().arg( lowerLabel ).arg( upperLabel );
QgsClassificationMethod * method(const QString &id)
Returns a new instance of the method for the given id.
The class is used as a container of context for various read/write operations on other objects...
virtual QString labelForRange(double lowerValue, double upperValue, ClassPosition position=Inner) const
Returns the label for a range.
QList< QgsClassificationRange > classes(const QgsVectorLayer *layer, const QString &expression, int nclasses)
This will calculate the classes for a given layer to define the classes.
QString formatNumber(double value) const
Format the number according to label properties.
const QgsProcessingParameterDefinition * parameterDefinition(const QString ¶meterName) const
Returns the parameter from its name.
static QList< double > getDoubleValues(const QgsVectorLayer *layer, const QString &fieldOrExpression, bool &ok, bool selectedOnly=false, int *nullCount=nullptr, QgsFeedback *feedback=nullptr)
Fetches all double values from a specified field name or expression.
int codeComplexity() const
Code complexity as the exponent in Big O notation.
QgsClassificationRange contains the information about a classification range.
virtual bool valuesRequired() const
Returns if the method requires values to calculate the classes If not, bounds are sufficient...
virtual void writeXml(QDomElement &element, const QgsReadWriteContext &context) const
Writes extra information about the method.
The class is not at a bound.
static const int MAX_PRECISION
QDomElement save(QDomDocument &doc, const QgsReadWriteContext &context) const
Saves the method to a DOM element and return it.
As part of the API refactoring and improvements which landed in the Processing API was substantially reworked from the x version This was done in order to allow much of the underlying Processing framework to be ported into c
double lowerValue() const
The class is at the upper bound.
void addParameter(QgsProcessingParameterDefinition *definition)
Add a parameter to the method.
void setSymmetricMode(bool enabled, double symmetryPoint=0, bool symmetryAstride=false)
Defines if the symmetric mode is enables and configures its parameters.
The class is at the lower bound.
int indexFromName(const QString &fieldName) const
Gets the field index from the field name.
static QVariant readVariant(const QDomElement &element)
Read a QVariant from a QDomElement.
QgsFields fields() const FINAL
Returns the list of fields of this layer.
double symmetryPoint() const
Returns the symmetry point for symmetric mode.
int labelPrecision() const
Returns the precision for the formatting of the labels.
static void logMessage(const QString &message, const QString &tag=QString(), Qgis::MessageLevel level=Qgis::Warning, bool notifyUser=true)
Adds a message to the log instance (and creates it if necessary).
void setLabelFormat(const QString &format)
Defines the format of the labels for the classes, using %1 and %2 for the bounds. ...
bool labelTrimTrailingZeroes() const
Returns if the trailing 0 are trimmed in the label.
QVariant minimumValue(int index) const FINAL
Returns the minimum value for an attribute column or an invalid variant in case of error...
void setLabelPrecision(int labelPrecision)
Defines the precision for the formatting of the labels.
void copyBase(QgsClassificationMethod *c) const
Copy the parameters (shall be used in clone implementation)
static const int MIN_PRECISION
bool symmetricModeEnabled() const
Returns if the symmetric mode is enabled.
virtual void readXml(const QDomElement &element, const QgsReadWriteContext &context)
Reads extra information to apply it to the method.
QString labelFormat() const
Returns the format of the label for the classes.
QgsClassificationMethod(MethodProperties properties=NoFlag, int codeComplexity=1)
Creates a classification method.
static QgsClassificationMethodRegistry * classificationMethodRegistry()
Returns the application's classification methods registry, used in graduated renderer.
static QList< double > rangesToBreaks(const QList< QgsClassificationRange > &classes)
Transforms a list of classes to a list of breaks.
Base class for the definition of processing parameters.
QVariantMap parameterValues() const
Returns the values of the processing parameters.
double upperValue() const
ClassPosition
Defines the class position.
static void makeBreaksSymmetric(QList< double > &breaks, double symmetryPoint, bool astride)
Remove the breaks that are above the existing opposite sign classes to keep colors symmetrically bala...
void setLabelTrimTrailingZeroes(bool trimTrailingZeroes)
Defines if the trailing 0 are trimmed in the label.
void setParameterValues(const QVariantMap &values)
Defines the values of the additional parameters.
QVariant maximumValue(int index) const FINAL
Returns the maximum value for an attribute column or an invalid variant in case of error...
Represents a vector layer which manages a vector based data sets.
QgsClassificationMethod is an abstract class for implementations of classification methods...
static QDomElement writeVariant(const QVariant &value, QDomDocument &doc)
Write a QVariant to a QDomElement.
virtual QString name() const =0
The readable and translate name of the method.
virtual ~QgsClassificationMethod()
static QgsClassificationMethod * create(const QDomElement &element, const QgsReadWriteContext &context)
Reads the DOM element and return a new classification method from it.