QCPColorMap Class Reference

Inheritance diagram for QCPColorMap:

Signals
void	dataRangeChanged (const QCPRange &newRange)
void	dataScaleTypeChanged (QCPAxis::ScaleType scaleType)
void	gradientChanged (const QCPColorGradient &newGradient)
Signals inherited from QCPAbstractPlottable
void	selectableChanged (QCP::SelectionType selectable)
void	selectionChanged (bool selected)
void	selectionChanged (const QCPDataSelection &selection)
Signals inherited from QCPLayerable
void	layerChanged (QCPLayer *newLayer)

Public Member Functions
	QCPColorMap (QCPAxis *keyAxis, QCPAxis *valueAxis)
QCPColorScale *	colorScale () const
QCPColorMapData *	data () const
QCPRange	dataRange () const
QCPAxis::ScaleType	dataScaleType () const
virtual QCPRange	getKeyRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth) const override
virtual QCPRange	getValueRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth, const QCPRange &inKeyRange=QCPRange()) const override
QCPColorGradient	gradient () const
bool	interpolate () const
void	rescaleDataRange (bool recalculateDataBounds=false)
virtual double	selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=nullptr) const override
void	setColorScale (QCPColorScale *colorScale)
void	setData (QCPColorMapData *data, bool copy=false)
Q_SLOT void	setDataRange (const QCPRange &dataRange)
Q_SLOT void	setDataScaleType (QCPAxis::ScaleType scaleType)
Q_SLOT void	setGradient (const QCPColorGradient &gradient)
void	setInterpolate (bool enabled)
void	setTightBoundary (bool enabled)
bool	tightBoundary () const
Q_SLOT void	updateLegendIcon (Qt::TransformationMode transformMode=Qt::SmoothTransformation, const QSize &thumbSize=QSize(32, 18))
Public Member Functions inherited from QCPAbstractPlottable
	QCPAbstractPlottable (QCPAxis *keyAxis, QCPAxis *valueAxis)
bool	addToLegend ()
bool	addToLegend (QCPLegend *legend)
bool	antialiasedFill () const
bool	antialiasedScatters () const
QBrush	brush () const
const QPointF	coordsToPixels (double key, double value) const
void	coordsToPixels (double key, double value, double &x, double &y) const
virtual QCPPlottableInterface1D *	interface1D ()
QCPAxis *	keyAxis () const
QString	name () const
QPen	pen () const
void	pixelsToCoords (const QPointF &pixelPos, double &key, double &value) const
void	pixelsToCoords (double x, double y, double &key, double &value) const
bool	removeFromLegend () const
bool	removeFromLegend (QCPLegend *legend) const
void	rescaleAxes (bool onlyEnlarge=false) const
void	rescaleKeyAxis (bool onlyEnlarge=false) const
void	rescaleValueAxis (bool onlyEnlarge=false, bool inKeyRange=false) const
QCP::SelectionType	selectable () const
bool	selected () const
QCPDataSelection	selection () const
QCPSelectionDecorator *	selectionDecorator () const
void	setAntialiasedFill (bool enabled)
void	setAntialiasedScatters (bool enabled)
void	setBrush (const QBrush &brush)
void	setKeyAxis (QCPAxis *axis)
void	setName (const QString &name)
void	setPen (const QPen &pen)
Q_SLOT void	setSelectable (QCP::SelectionType selectable)
Q_SLOT void	setSelection (QCPDataSelection selection)
void	setSelectionDecorator (QCPSelectionDecorator *decorator)
void	setValueAxis (QCPAxis *axis)
QCPAxis *	valueAxis () const
Public Member Functions inherited from QCPLayerable
	QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=nullptr)
bool	antialiased () const
QCPLayer *	layer () const
QCPLayerable *	parentLayerable () const
QCustomPlot *	parentPlot () const
bool	realVisibility () const
void	setAntialiased (bool enabled)
bool	setLayer (const QString &layerName)
Q_SLOT bool	setLayer (QCPLayer *layer)
void	setVisible (bool on)
bool	visible () const
Public Member Functions inherited from QObject
	QObject (QObject *parent)
QBindable< QString >	bindableObjectName ()
bool	blockSignals (bool block)
const QObjectList &	children () const const
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
void	deleteLater ()
void	destroyed (QObject *obj)
bool	disconnect (const char *signal, const QObject *receiver, const char *method) const const
bool	disconnect (const QObject *receiver, const char *method) const const
void	dumpObjectInfo () const const
void	dumpObjectTree () const const
QList< QByteArray >	dynamicPropertyNames () const const
virtual bool	event (QEvent *e)
virtual bool	eventFilter (QObject *watched, QEvent *event)
T	findChild (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const
QList< T >	findChildren (Qt::FindChildOptions options) const const
bool	inherits (const char *className) const const
void	installEventFilter (QObject *filterObj)
bool	isQuickItemType () const const
bool	isWidgetType () const const
bool	isWindowType () const const
void	killTimer (int id)
virtual const QMetaObject *	metaObject () const const
void	moveToThread (QThread *targetThread)
QString	objectName () const const
void	objectNameChanged (const QString &objectName)
QObject *	parent () const const
QVariant	property (const char *name) const const
	Q_CLASSINFO (Name, Value)
	Q_EMIT Q_EMIT
	Q_ENUM (...)
	Q_ENUM_NS (...)
	Q_ENUMS (...)
	Q_FLAG (...)
	Q_FLAG_NS (...)
	Q_FLAGS (...)
	Q_GADGET Q_GADGET
	Q_GADGET_EXPORT (EXPORT_MACRO)
	Q_INTERFACES (...)
	Q_INVOKABLE Q_INVOKABLE
	Q_MOC_INCLUDE Q_MOC_INCLUDE
	Q_NAMESPACE Q_NAMESPACE
	Q_NAMESPACE_EXPORT (EXPORT_MACRO)
	Q_OBJECT Q_OBJECT
	Q_PROPERTY (...)
	Q_REVISION Q_REVISION
	Q_SET_OBJECT_NAME (Object)
	Q_SIGNAL Q_SIGNAL
	Q_SIGNALS Q_SIGNALS
	Q_SLOT Q_SLOT
	Q_SLOTS Q_SLOTS
T	qobject_cast (const QObject *object)
T	qobject_cast (QObject *object)
	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT
void	removeEventFilter (QObject *obj)
void	setObjectName (const QString &name)
void	setObjectName (QAnyStringView name)
void	setParent (QObject *parent)
bool	setProperty (const char *name, const QVariant &value)
bool	setProperty (const char *name, QVariant &&value)
bool	signalsBlocked () const const
int	startTimer (int interval, Qt::TimerType timerType)
int	startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType)
QThread *	thread () const const

Protected Member Functions
virtual void	draw (QCPPainter *painter) override
virtual void	drawLegendIcon (QCPPainter *painter, const QRectF &rect) const override
virtual void	updateMapImage ()
Protected Member Functions inherited from QCPAbstractPlottable
void	applyDefaultAntialiasingHint (QCPPainter *painter) const override
void	applyFillAntialiasingHint (QCPPainter *painter) const
void	applyScattersAntialiasingHint (QCPPainter *painter) const
virtual QRect	clipRect () const override
virtual void	deselectEvent (bool *selectionStateChanged) override
virtual void	selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged) override
virtual QCP::Interaction	selectionCategory () const override
Protected Member Functions inherited from QCPLayerable
void	applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const
void	initializeParentPlot (QCustomPlot *parentPlot)
virtual void	mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details)
virtual void	mouseMoveEvent (QMouseEvent *event, const QPointF &startPos)
virtual void	mousePressEvent (QMouseEvent *event, const QVariant &details)
virtual void	mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos)
bool	moveToLayer (QCPLayer *layer, bool prepend)
virtual void	parentPlotInitialized (QCustomPlot *parentPlot)
void	setParentLayerable (QCPLayerable *parentLayerable)
virtual void	wheelEvent (QWheelEvent *event)
Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	customEvent (QEvent *event)
virtual void	disconnectNotify (const QMetaMethod &signal)
bool	isSignalConnected (const QMetaMethod &signal) const const
int	receivers (const char *signal) const const
QObject *	sender () const const
int	senderSignalIndex () const const
virtual void	timerEvent (QTimerEvent *event)

Protected Attributes
QPointer< QCPColorScale >	mColorScale
QCPRange	mDataRange
QCPAxis::ScaleType	mDataScaleType
QCPColorGradient	mGradient
bool	mInterpolate
QPixmap	mLegendIcon
QCPColorMapData *	mMapData
QImage	mMapImage
bool	mMapImageInvalidated
bool	mTightBoundary
QImage	mUndersampledMapImage
Protected Attributes inherited from QCPAbstractPlottable
bool	mAntialiasedFill
bool	mAntialiasedScatters
QBrush	mBrush
QPointer< QCPAxis >	mKeyAxis
QString	mName
QPen	mPen
QCP::SelectionType	mSelectable
QCPDataSelection	mSelection
QCPSelectionDecorator *	mSelectionDecorator
QPointer< QCPAxis >	mValueAxis
Protected Attributes inherited from QCPLayerable
bool	mAntialiased
QCPLayer *	mLayer
QPointer< QCPLayerable >	mParentLayerable
QCustomPlot *	mParentPlot
bool	mVisible

Additional Inherited Members
Properties inherited from QObject
	objectName
Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type)
QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)
bool	disconnect (const QMetaObject::Connection &connection)
bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method)
bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method)
bool	disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method)
QString	tr (const char *sourceText, const char *disambiguation, int n)
Public Attributes inherited from QObject
typedef	QObjectList

Detailed Description

A plottable representing a two-dimensional color map in a plot.

The data is stored in the class QCPColorMapData, which can be accessed via the data() method.

A color map has three dimensions to represent a data point: The key dimension, the value dimension and the data dimension. As with other plottables such as graphs, key and value correspond to two orthogonal axes on the QCustomPlot surface that you specify in the QCPColorMap constructor. The data dimension however is encoded as the color of the point at (key, value).

Set the number of points (or cells) in the key/value dimension via QCPColorMapData::setSize. The plot coordinate range over which these points will be displayed is specified via QCPColorMapData::setRange. The first cell will be centered on the lower range boundary and the last cell will be centered on the upper range boundary. The data can be set by either accessing the cells directly with QCPColorMapData::setCell or by addressing the cells via their plot coordinates with QCPColorMapData::setData. If possible, you should prefer setCell, since it doesn't need to do any coordinate transformation and thus performs a bit better.

The cell with index (0, 0) is at the bottom left, if the color map uses normal (i.e. not reversed) key and value axes.

To show the user which colors correspond to which data values, a QCPColorScale is typically placed to the right of the axis rect. See the documentation there for details on how to add and use a color scale.

Changing the appearance

Most important to the appearance is the color gradient, which can be specified via setGradient. See the documentation of QCPColorGradient for details on configuring a color gradient.

The data range that is mapped to the colors of the gradient can be specified with setDataRange. To make the data range encompass the whole data set minimum to maximum, call rescaleDataRange. If your data may contain NaN values, use QCPColorGradient::setNanHandling to define how they are displayed.

Transparency

Transparency in color maps can be achieved by two mechanisms. On one hand, you can specify alpha values for color stops of the QCPColorGradient, via the regular QColor interface. This will cause the color map data which gets mapped to colors around those color stops to appear with the accordingly interpolated transparency.

On the other hand you can also directly apply an alpha value to each cell independent of its data, by using the alpha map feature of QCPColorMapData. The relevant methods are QCPColorMapData::setAlpha, QCPColorMapData::fillAlpha and QCPColorMapData::clearAlpha().

The two transparencies will be joined together in the plot and otherwise not interfere with each other. They are mixed in a multiplicative matter, so an alpha of e.g. 50% (128/255) in both modes simultaneously, will result in a total transparency of 25% (64/255).

Usage

Like all data representing objects in QCustomPlot, the QCPColorMap is a plottable (QCPAbstractPlottable). So the plottable-interface of QCustomPlot applies (QCustomPlot::plottable, QCustomPlot::removePlottable, etc.)

Usually, you first create an instance:

which registers it with the QCustomPlot instance of the passed axes. Note that this QCustomPlot instance takes ownership of the plottable, so do not delete it manually but use QCustomPlot::removePlottable() instead. The newly created plottable can be modified, e.g.:

Note

The QCPColorMap always displays the data at equal key/value intervals, even if the key or value axis is set to a logarithmic scaling. If you want to use QCPColorMap with logarithmic axes, you shouldn't use the QCPColorMapData::setData method as it uses a linear transformation to determine the cell index. Rather directly access the cell index with QCPColorMapData::setCell.

Definition at line 6021 of file qcustomplot.h.

Constructor & Destructor Documentation

QCPColorMap()

QCPColorMap::QCPColorMap ( QCPAxis * keyAxis, QCPAxis * valueAxis )

explicit

Constructs a color map with the specified keyAxis and valueAxis.

The created QCPColorMap is automatically registered with the QCustomPlot instance inferred from keyAxis. This QCustomPlot instance takes ownership of the QCPColorMap, so do not delete it manually but use QCustomPlot::removePlottable() instead.

Definition at line 26423 of file qcustomplot.cpp.

~QCPColorMap()

QCPColorMap::~QCPColorMap ( )

overridevirtual

Definition at line 26434 of file qcustomplot.cpp.

Member Function Documentation

colorScale()

QCPColorScale * QCPColorMap::colorScale ( ) const

inline

Definition at line 6043 of file qcustomplot.h.

data()

QCPColorMapData * QCPColorMap::data ( ) const

inline

Returns a pointer to the internal data storage of type QCPColorMapData. Access this to modify data points (cells) and the color map key/value range.

See also

setData

Definition at line 6037 of file qcustomplot.h.

dataRange()

QCPRange QCPColorMap::dataRange ( ) const

inline

Definition at line 6038 of file qcustomplot.h.

dataRangeChanged

void QCPColorMap::dataRangeChanged ( const QCPRange & newRange )

signal

This signal is emitted when the data range changes.

See also

setDataRange

dataScaleType()

QCPAxis::ScaleType QCPColorMap::dataScaleType ( ) const

inline

Definition at line 6039 of file qcustomplot.h.

dataScaleTypeChanged

void QCPColorMap::dataScaleTypeChanged ( QCPAxis::ScaleType scaleType )

signal

This signal is emitted when the data scale type changes.

See also

setDataScaleType

draw()

void QCPColorMap::draw ( QCPPainter * painter )

overrideprotectedvirtual

This function draws the layerable with the specified painter. It is only called by QCustomPlot, if the layerable is visible (setVisible).

Before this function is called, the painter's antialiasing state is set via applyDefaultAntialiasingHint, see the documentation there. Further, the clipping rectangle was set to clipRect.

Implements QCPAbstractPlottable.

Definition at line 26814 of file qcustomplot.cpp.

drawLegendIcon()

void QCPColorMap::drawLegendIcon ( QCPPainter * painter, const QRectF & rect ) const

overrideprotectedvirtual

called by QCPLegend::draw (via QCPPlottableLegendItem::draw) to create a graphical representation of this plottable inside rect, next to the plottable name.

The passed painter has its cliprect set to rect, so painting outside of rect won't appear outside the legend icon border.

Implements QCPAbstractPlottable.

Definition at line 26883 of file qcustomplot.cpp.

getKeyRange()

QCPRange QCPColorMap::getKeyRange ( bool & foundRange, QCP::SignDomain inSignDomain = QCP::sdBoth ) const

overridevirtual

Returns the coordinate range that all data in this plottable span in the key axis dimension. For logarithmic plots, one can set inSignDomain to either QCP::sdNegative or QCP::sdPositive in order to restrict the returned range to that sign domain. E.g. when only negative range is wanted, set inSignDomain to QCP::sdNegative and all positive points will be ignored for range calculation. For no restriction, just set inSignDomain to QCP::sdBoth (default). foundRange is an output parameter that indicates whether a range could be found or not. If this is false, you shouldn't use the returned range (e.g. no points in data).

Note that foundRange is not the same as QCPRange::validRange, since the range returned by this function may have size zero (e.g. when there is only one data point). In this case foundRange would return true, but the returned range is not a valid range in terms of QCPRange::validRange.

See also

rescaleAxes, getValueRange

Implements QCPAbstractPlottable.

Definition at line 26670 of file qcustomplot.cpp.

getValueRange()

QCPRange QCPColorMap::getValueRange ( bool & foundRange, QCP::SignDomain inSignDomain = QCP::sdBoth, const QCPRange & inKeyRange = QCPRange() ) const

overridevirtual

Returns the coordinate range that the data points in the specified key range (inKeyRange) span in the value axis dimension. For logarithmic plots, one can set inSignDomain to either QCP::sdNegative or QCP::sdPositive in order to restrict the returned range to that sign domain. E.g. when only negative range is wanted, set inSignDomain to QCP::sdNegative and all positive points will be ignored for range calculation. For no restriction, just set inSignDomain to QCP::sdBoth (default). foundRange is an output parameter that indicates whether a range could be found or not. If this is false, you shouldn't use the returned range (e.g. no points in data).

If inKeyRange has both lower and upper bound set to zero (is equal to QCPRange()), all data points are considered, without any restriction on the keys.

Note that foundRange is not the same as QCPRange::validRange, since the range returned by this function may have size zero (e.g. when there is only one data point). In this case foundRange would return true, but the returned range is not a valid range in terms of QCPRange::validRange.

See also

rescaleAxes, getKeyRange

Implements QCPAbstractPlottable.

Definition at line 26692 of file qcustomplot.cpp.

gradient()

QCPColorGradient QCPColorMap::gradient ( ) const

inline

Definition at line 6042 of file qcustomplot.h.

gradientChanged

void QCPColorMap::gradientChanged ( const QCPColorGradient & newGradient )

signal

This signal is emitted when the gradient changes.

See also

setGradient

interpolate()

bool QCPColorMap::interpolate ( ) const

inline

Definition at line 6040 of file qcustomplot.h.

rescaleDataRange()

void QCPColorMap::rescaleDataRange

(

bool

recalculateDataBounds = false

)

Sets the data range (setDataRange) to span the minimum and maximum values that occur in the current data set. This corresponds to the rescaleKeyAxis or rescaleValueAxis methods, only for the third data dimension of the color map.

The minimum and maximum values of the data set are buffered in the internal QCPColorMapData instance (data). As data is updated via its QCPColorMapData::setCell or QCPColorMapData::setData, the buffered minimum and maximum values are updated, too. For performance reasons, however, they are only updated in an expanding fashion. So the buffered maximum can only increase and the buffered minimum can only decrease. In consequence, changes to the data that actually lower the maximum of the data set (by overwriting the cell holding the current maximum with a smaller value), aren't recognized and the buffered maximum overestimates the true maximum of the data set. The same happens for the buffered minimum. To recalculate the true minimum and maximum by explicitly looking at each cell, the method QCPColorMapData::recalculateDataBounds can be used. For convenience, setting the parameter recalculateDataBounds calls this method before setting the data range to the buffered minimum and maximum.

See also

setDataRange

Definition at line 26612 of file qcustomplot.cpp.

selectTest()

double QCPColorMap::selectTest ( const QPointF & pos, bool onlySelectable, QVariant * details = nullptr ) const

overridevirtual

This function is used to decide whether a click hits a layerable object or not.

pos is a point in pixel coordinates on the QCustomPlot surface. This function returns the shortest pixel distance of this point to the object. If the object is either invisible or the distance couldn't be determined, -1.0 is returned. Further, if onlySelectable is true and the object is not selectable, -1.0 is returned, too.

If the object is represented not by single lines but by an area like a QCPItemText or the bars of a QCPBars plottable, a click inside the area should also be considered a hit. In these cases this function thus returns a constant value greater zero but still below the parent plot's selection tolerance. (typically the selectionTolerance multiplied by 0.99).

Providing a constant value for area objects allows selecting line objects even when they are obscured by such area objects, by clicking close to the lines (i.e. closer than 0.99*selectionTolerance).

The actual setting of the selection state is not done by this function. This is handled by the parent QCustomPlot when the mouseReleaseEvent occurs, and the finally selected object is notified via the selectEvent/ deselectEvent methods.

details is an optional output parameter. Every layerable subclass may place any information in details. This information will be passed to selectEvent when the parent QCustomPlot decides on the basis of this selectTest call, that the object was successfully selected. The subsequent call to selectEvent will carry the details. This is useful for multi-part objects (like QCPAxis). This way, a possibly complex calculation to decide which part was clicked is only done once in selectTest. The result (i.e. the actually clicked part) can then be placed in details. So in the subsequent selectEvent, the decision which part was selected doesn't have to be done a second time for a single selection operation.

In the case of 1D Plottables (QCPAbstractPlottable1D, like QCPGraph or QCPBars) details will be set to a QCPDataSelection, describing the closest data point to pos.

You may pass nullptr as details to indicate that you are not interested in those selection details.

See also

selectEvent, deselectEvent, mousePressEvent, wheelEvent, QCustomPlot::setInteractions, QCPAbstractPlottable1D::selectTestRect

Implements QCPAbstractPlottable.

Definition at line 26647 of file qcustomplot.cpp.

setColorScale()

void QCPColorMap::setColorScale

(

QCPColorScale *

colorScale

)

Associates the color scale colorScale with this color map.

This means that both the color scale and the color map synchronize their gradient, data range and data scale type (setGradient, setDataRange, setDataScaleType). Multiple color maps can be associated with one single color scale. This causes the color maps to also synchronize those properties, via the mutual color scale.

This function causes the color map to adopt the current color gradient, data range and data scale type of colorScale. After this call, you may change these properties at either the color map or the color scale, and the setting will be applied to both.

Pass nullptr as colorScale to disconnect the color scale from this color map again.

Definition at line 26566 of file qcustomplot.cpp.

setData()

void QCPColorMap::setData	(	QCPColorMapData *	data,
		bool	copy = false )

Replaces the current data with the provided data.

If copy is set to true, the data object will only be copied. if false, the color map takes ownership of the passed data and replaces the internal data pointer with it. This is significantly faster than copying for large datasets.

Definition at line 26446 of file qcustomplot.cpp.

setDataRange()

void QCPColorMap::setDataRange

(

const QCPRange &

dataRange

)

Sets the data range of this color map to dataRange. The data range defines which data values are mapped to the color gradient.

To make the data range span the full range of the data set, use rescaleDataRange.

See also

QCPColorScale::setDataRange

Definition at line 26472 of file qcustomplot.cpp.

setDataScaleType()

void QCPColorMap::setDataScaleType

(

QCPAxis::ScaleType

scaleType

)

Sets whether the data is correlated with the color gradient linearly or logarithmically.

See also

QCPColorScale::setDataScaleType

Definition at line 26491 of file qcustomplot.cpp.

setGradient()

void QCPColorMap::setGradient

(

const QCPColorGradient &

gradient

)

Sets the color gradient that is used to represent the data. For more details on how to create an own gradient or use one of the preset gradients, see QCPColorGradient.

The colors defined by the gradient will be used to represent data values in the currently set data range, see setDataRange. Data points that are outside this data range will either be colored uniformly with the respective gradient boundary color, or the gradient will repeat, depending on QCPColorGradient::setPeriodic.

See also

QCPColorScale::setGradient

Definition at line 26514 of file qcustomplot.cpp.

setInterpolate()

void QCPColorMap::setInterpolate

(

bool

enabled

)

Sets whether the color map image shall use bicubic interpolation when displaying the color map shrinked or expanded, and not at a 1:1 pixel-to-data scale.

A 10*10 color map, with interpolation and without interpolation enabled

Definition at line 26530 of file qcustomplot.cpp.

setTightBoundary()

void QCPColorMap::setTightBoundary

(

bool

enabled

)

Sets whether the outer most data rows and columns are clipped to the specified key and value range (see QCPColorMapData::setKeyRange, QCPColorMapData::setValueRange).

if enabled is set to false, the data points at the border of the color map are drawn with the same width and height as all other data points. Since the data points are represented by rectangles of one color centered on the data coordinate, this means that the shown color map extends by half a data point over the specified key/value range in each direction.

A color map, with tight boundary enabled and disabled

Definition at line 26547 of file qcustomplot.cpp.

tightBoundary()

bool QCPColorMap::tightBoundary ( ) const

inline

Definition at line 6041 of file qcustomplot.h.

updateLegendIcon()

void QCPColorMap::updateLegendIcon	(	Qt::TransformationMode	transformMode = Qt::SmoothTransformation,
		const QSize &	thumbSize = QSize(32, 18) )

Takes the current appearance of the color map and updates the legend icon, which is used to represent this color map in the legend (see QCPLegend).

The transformMode specifies whether the rescaling is done by a faster, low quality image scaling algorithm (Qt::FastTransformation) or by a slower, higher quality algorithm (Qt::SmoothTransformation).

The current color map appearance is scaled down to thumbSize. Ideally, this should be equal to the size of the legend icon (see QCPLegend::setIconSize). If it isn't exactly the configured legend icon size, the thumb will be rescaled during drawing of the legend item.

See also

setDataRange

Definition at line 26633 of file qcustomplot.cpp.

updateMapImage()

void QCPColorMap::updateMapImage ( )

protectedvirtual

Updates the internal map image buffer by going through the internal QCPColorMapData and turning the data values into color pixels with QCPColorGradient::colorize.

This method is called by QCPColorMap::draw if either the data has been modified or the map image has been invalidated for a different reason (e.g. a change of the data range with setDataRange).

If the map cell count is low, the image created will be oversampled in order to avoid a QPainter::drawImage bug which makes inner pixel boundaries jitter when stretch-drawing images without smooth transform enabled. Accordingly, oversampling isn't performed if setInterpolate is true.

Definition at line 26736 of file qcustomplot.cpp.

Member Data Documentation

mColorScale

QPointer<QCPColorScale> QCPColorMap::mColorScale

protected

Definition at line 6076 of file qcustomplot.h.

mDataRange

QCPRange QCPColorMap::mDataRange

protected

Definition at line 6070 of file qcustomplot.h.

mDataScaleType

QCPAxis::ScaleType QCPColorMap::mDataScaleType

protected

Definition at line 6071 of file qcustomplot.h.

mGradient

QCPColorGradient QCPColorMap::mGradient

protected

Definition at line 6073 of file qcustomplot.h.

mInterpolate

bool QCPColorMap::mInterpolate

protected

Definition at line 6074 of file qcustomplot.h.

mLegendIcon

QPixmap QCPColorMap::mLegendIcon

protected

Definition at line 6080 of file qcustomplot.h.

mMapData

QCPColorMapData* QCPColorMap::mMapData

protected

Definition at line 6072 of file qcustomplot.h.

mMapImage

QImage QCPColorMap::mMapImage

protected

Definition at line 6079 of file qcustomplot.h.

mMapImageInvalidated

bool QCPColorMap::mMapImageInvalidated

protected

Definition at line 6081 of file qcustomplot.h.

mTightBoundary

bool QCPColorMap::mTightBoundary

protected

Definition at line 6075 of file qcustomplot.h.

mUndersampledMapImage

QImage QCPColorMap::mUndersampledMapImage

protected

Definition at line 6079 of file qcustomplot.h.

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The documentation for this class was generated from the following files:

• qcustomplot.h
• qcustomplot.cpp