QCPBars Class Reference

A plottable representing a bar chart in a plot. More...

Inheritance diagram for QCPBars:

## Public Member Functions

| QCPBars (QCPAxis *keyAxis, QCPAxis *valueAxis)
double | width () const
QCPBars * | barBelow () const
QCPBars * | barAbove () const
QCPBarDataMap * | data () const
void | setWidth (double width)
void | setData (QCPBarDataMap *data, bool copy=false)
void | setData (const QVector< double > &key, const QVector< double > &value)
void | moveBelow (QCPBars *bars)
void | moveAbove (QCPBars *bars)
void | addData (const QCPBarDataMap &dataMap)
void | addData (const QCPBarData &data)
void | addData (double key, double value)
void | addData (const QVector< double > &keys, const QVector< double > &values)
void | removeDataBefore (double key)
void | removeDataAfter (double key)
void | removeData (double fromKey, double toKey)
void | removeData (double key)
virtual void | clearData ()
virtual double | selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const
Public Member Functions inherited from QCPAbstractPlottable
| QCPAbstractPlottable (QCPAxis *keyAxis, QCPAxis *valueAxis)
QString | name () const
bool | antialiasedFill () const
bool | antialiasedScatters () const
bool | antialiasedErrorBars () const
QPen | pen () const
QPen | selectedPen () const
QBrush | brush () const
QBrush | selectedBrush () const
QCPAxis * | keyAxis () const
QCPAxis * | valueAxis () const
bool | selectable () const
bool | selected () const
void | setName (const QString &name)
void | setAntialiasedFill (bool enabled)
void | setAntialiasedScatters (bool enabled)
void | setAntialiasedErrorBars (bool enabled)
void | setPen (const QPen &pen)
void | setSelectedPen (const QPen &pen)
void | setBrush (const QBrush &brush)
void | setSelectedBrush (const QBrush &brush)
void | setKeyAxis (QCPAxis *axis)
void | setValueAxis (QCPAxis *axis)
Q_SLOT void | setSelectable (bool selectable)
Q_SLOT void | setSelected (bool selected)
virtual bool | addToLegend ()
virtual bool | removeFromLegend () const
void | rescaleAxes (bool onlyEnlarge=false) const
void | rescaleKeyAxis (bool onlyEnlarge=false) const
void | rescaleValueAxis (bool onlyEnlarge=false) const
Public Member Functions inherited from QCPLayerable
| QCPLayerable (QCustomPlot *plot, QString targetLayer="", QCPLayerable *parentLayerable=0)
bool | visible () const
QCustomPlot * | parentPlot () const
QCPLayerable * | parentLayerable () const
QCPLayer * | layer () const
bool | antialiased () const
void | setVisible (bool on)
bool | setLayer (QCPLayer *layer)
bool | setLayer (const QString &layerName)
void | setAntialiased (bool enabled)
bool | realVisibility () const

## Protected Member Functions

virtual void | draw (QCPPainter *painter)
virtual void | drawLegendIcon (QCPPainter *painter, const QRectF &rect) const
virtual QCPRange | getKeyRange (bool &validRange, SignDomain inSignDomain=sdBoth) const
virtual QCPRange | getValueRange (bool &validRange, SignDomain inSignDomain=sdBoth) const
QPolygonF | getBarPolygon (double key, double value) const
double | getBaseValue (double key, bool positive) const
Protected Member Functions inherited from QCPAbstractPlottable
virtual QRect | clipRect () const
virtual QCP::Interaction | selectionCategory () const
void | applyDefaultAntialiasingHint (QCPPainter *painter) const
virtual void | selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged)
virtual void | deselectEvent (bool *selectionStateChanged)
void | coordsToPixels (double key, double value, double &x, double &y) const
const QPointF | coordsToPixels (double key, double value) const
void | pixelsToCoords (double x, double y, double &key, double &value) const
void | pixelsToCoords (const QPointF &pixelPos, double &key, double &value) const
QPen | mainPen () const
QBrush | mainBrush () const
void | applyFillAntialiasingHint (QCPPainter *painter) const
void | applyScattersAntialiasingHint (QCPPainter *painter) const
void | applyErrorBarsAntialiasingHint (QCPPainter *painter) const
double | distSqrToLine (const QPointF &start, const QPointF &end, const QPointF &point) const
Protected Member Functions inherited from QCPLayerable
virtual void | parentPlotInitialized (QCustomPlot *parentPlot)
void | initializeParentPlot (QCustomPlot *parentPlot)
void | setParentLayerable (QCPLayerable *parentLayerable)
bool | moveToLayer (QCPLayer *layer, bool prepend)
void | applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const

## Static Protected Member Functions

static void | connectBars (QCPBars *lower, QCPBars *upper)

## Protected Attributes

QCPBarDataMap * | mData
double | mWidth
QPointer< QCPBars > | mBarBelow
QPointer< QCPBars > | mBarAbove
Protected Attributes inherited from QCPAbstractPlottable
QString | mName
bool | mAntialiasedFill
bool | mAntialiasedScatters
bool | mAntialiasedErrorBars
QPen | mPen
QPen | mSelectedPen
QBrush | mBrush
QBrush | mSelectedBrush
QPointer< QCPAxis > | mKeyAxis
QPointer< QCPAxis > | mValueAxis
bool | mSelectable
bool | mSelected
Protected Attributes inherited from QCPLayerable
bool | mVisible
QCustomPlot * | mParentPlot
QPointer< QCPLayerable > | mParentLayerable
QCPLayer * | mLayer
bool | mAntialiased

## Friends

class | QCustomPlot
class | QCPLegend

## Additional Inherited Members

Signals inherited from QCPAbstractPlottable
void | selectionChanged (bool selected)
Protected Types inherited from QCPAbstractPlottable
enum | SignDomain { sdNegative, sdBoth, sdPositive }

## Detailed Description

A plottable representing a bar chart in a plot.

To plot data, assign it with the setData or addData functions.

# Changing the appearance

The appearance of the bars is determined by the pen and the brush (setPen, setBrush).

Bar charts are stackable. This means, Two QCPBars plottables can be placed on top of each other (see QCPBars::moveAbove). Then, when two bars are at the same key position, they will appear stacked.

# Usage

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

Usually, you first create an instance:

QCPBars *newBars = new QCPBars(customPlot->xAxis, customPlot->yAxis);

add it to the customPlot with QCustomPlot::addPlottable:

customPlot->addPlottable(newBars);

and then modify the properties of the newly created plottable, e.g.:

newBars->setName("Country population");
newBars->setData(xData, yData);

## Constructor & Destructor Documentation

QCPBars::QCPBars | ( | QCPAxis * | keyAxis,
|  | QCPAxis * | valueAxis
| ) |  |

explicit

Constructs a bar chart which uses keyAxis as its key axis ("x") and valueAxis as its value axis ("y"). keyAxis and valueAxis must reside in the same QCustomPlot instance and not have the same orientation. If either of these restrictions is violated, a corresponding message is printed to the debug output (qDebug), the construction is not aborted, though.

The constructed QCPBars can be added to the plot with QCustomPlot::addPlottable, QCustomPlot then takes ownership of the bar chart.

## Member Function Documentation

void QCPBars::addData | ( | const QCPBarDataMap & | dataMap | ) |

Adds the provided data points in dataMap to the current data.

See also
  removeData

void QCPBars::addData | ( | const QCPBarData & | data | ) |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Adds the provided single data point in data to the current data.

See also
  removeData

void QCPBars::addData | ( | double | key,
|  | double | value
| ) |  |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Adds the provided single data point as key and value tuple to the current data

See also
  removeData

void QCPBars::addData | ( | const QVector< double > & | keys,
|  | const QVector< double > & | values
| ) |  |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Adds the provided data points as key and value tuples to the current data.

See also
  removeData

QCPBars * QCPBars::barAbove | ( |  | ) | const

inline

Returns the bars plottable that is directly above this bars plottable. If there is no such plottable, returns 0.

See also
  barBelow, moveBelow, moveAbove

QCPBars * QCPBars::barBelow | ( |  | ) | const

inline

Returns the bars plottable that is directly below this bars plottable. If there is no such plottable, returns 0.

See also
  barAbove, moveBelow, moveAbove

void QCPBars::clearData | ( |  | ) |

virtual

Removes all data points.

See also
  removeData, removeDataAfter, removeDataBefore

Implements QCPAbstractPlottable.

void QCPBars::moveAbove | ( | QCPBars * | bars | ) |

Moves this bars plottable above bars. In other words, the bars of this plottable will appear above the bars of bars. The move target bars must use the same key and value axis as this plottable.

Inserting into and removing from existing bar stacking is handled gracefully. If bars already has a bars object below itself, this bars object is inserted between the two. If this bars object is already between two other bars, the two other bars will be stacked on top of each other after the operation.

To remove this bars plottable from any stacking, set bars to 0.

See also
  moveBelow, barBelow, barAbove

void QCPBars::moveBelow | ( | QCPBars * | bars | ) |

Moves this bars plottable below bars. In other words, the bars of this plottable will appear below the bars of bars. The move target bars must use the same key and value axis as this plottable.

Inserting into and removing from existing bar stacking is handled gracefully. If bars already has a bars object below itself, this bars object is inserted between the two. If this bars object is already between two other bars, the two other bars will be stacked on top of each other after the operation.

To remove this bars plottable from any stacking, set bars to 0.

See also
  moveBelow, barAbove, barBelow

void QCPBars::removeData | ( | double | fromKey,
|  | double | toKey
| ) |  |

Removes all data points with key between fromKey and toKey. if fromKey is greater or equal to toKey, the function does nothing. To remove a single data point with known key, use removeData(double key).

See also
  addData, clearData

void QCPBars::removeData | ( | double | key | ) |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Removes a single data point at key. If the position is not known with absolute precision, consider using removeData(double fromKey, double toKey) with a small fuzziness interval around the suspected position, depeding on the precision with which the key is known.

See also
  addData, clearData

void QCPBars::removeDataAfter | ( | double | key | ) |

Removes all data points with key greater than key.

See also
  addData, clearData

void QCPBars::removeDataBefore | ( | double | key | ) |

Removes all data points with key smaller than key.

See also
  addData, clearData

double QCPBars::selectTest | ( | const QPointF & | pos,
|  | bool | onlySelectable,
|  | QVariant * | details = `0`
| ) |  | const

virtual

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 item is represented not by single lines but by an area like QCPItemRect or QCPItemText, a click inside the area returns a constant value greater zero (typically the selectionTolerance of the parent QCustomPlot multiplied by 0.99). If the click lies outside the area, this function returns -1.0.

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.

You may pass 0 as details to indicate that you are not interested in those selection details.

See also
  selectEvent, deselectEvent, QCustomPlot::setInteractions

Implements QCPAbstractPlottable.

void QCPBars::setData | ( | QCPBarDataMap * | data,
|  | bool | copy = `false`
| ) |  |

Replaces the current data with the provided data.

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

void QCPBars::setData | ( | const QVector< double > & | key,
|  | const QVector< double > & | value
| ) |  |

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Replaces the current data with the provided points in key and value tuples. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

void QCPBars::setWidth | ( | double | width | ) |

Sets the width of the bars in plot (key) coordinates.

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

- qcustomplot.h
- qcustomplot.cpp