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QCPlot::QCPItemBracket Class Reference

A bracket for referencing/highlighting certain parts in the plot. More...

Inheritance diagram for QCPlot::QCPItemBracket:
QCPlot::QCPAbstractItem QCPlot::QCPLayerable

Public Types

enum  BracketStyle { bsSquare, bsRound, bsCurly, bsCalligraphic }
 

Public Member Functions

 QCPItemBracket (QCustomPlot *parentPlot)
 Creates a bracket item and sets default values. More...
 
QPen pen () const
 
QPen selectedPen () const
 
double length () const
 
BracketStyle style () const
 
void setPen (const QPen &pen)
 Sets the pen that will be used to draw the bracket. More...
 
void setSelectedPen (const QPen &pen)
 Sets the pen that will be used to draw the bracket when selected. More...
 
void setLength (double length)
 Sets the length in pixels how far the bracket extends in the direction towards the embraced span of the bracket (i.e. More...
 
void setStyle (BracketStyle style)
 Sets the style of the bracket, i.e. More...
 
virtual double selectTest (const QPointF &pos) const
 This function is used to decide whether a click hits an item or not. More...
 
- Public Member Functions inherited from QCPlot::QCPAbstractItem
 QCPAbstractItem (QCustomPlot *parentPlot)
 Base class constructor which initializes base class members.
 
bool clipToAxisRect () const
 
QCPAxisclipKeyAxis () const
 
QCPAxisclipValueAxis () const
 
bool selectable () const
 
bool selected () const
 
void setClipToAxisRect (bool clip)
 Sets whether the item shall be clipped to the axis rect or whether it shall be visible on the entire QCustomPlot. More...
 
void setClipAxes (QCPAxis *keyAxis, QCPAxis *valueAxis)
 Sets both clip axes. More...
 
void setClipKeyAxis (QCPAxis *axis)
 Sets the clip key axis. More...
 
void setClipValueAxis (QCPAxis *axis)
 Sets the clip value axis. More...
 
void setSelectable (bool selectable)
 Sets whether the user can (de-)select this item by clicking on the QCustomPlot surface. More...
 
void setSelected (bool selected)
 Sets whether this item is selected or not. More...
 
QList< QCPItemPosition * > positions () const
 Returns all positions of the item in a list. More...
 
QList< QCPItemAnchor * > anchors () const
 Returns all anchors of the item in a list. More...
 
QCPItemPositionposition (const QString &name) const
 Returns the QCPItemPosition with the specified name. More...
 
QCPItemAnchoranchor (const QString &name) const
 Returns the QCPItemAnchor with the specified name. More...
 
bool hasAnchor (const QString &name) const
 Returns whether this item has an anchor with the specified name. More...
 
- Public Member Functions inherited from QCPlot::QCPLayerable
 QCPLayerable (QCustomPlot *parentPlot)
 Creates a new QCPLayerable instance. More...
 
bool visible () const
 
QCustomPlotparentPlot () const
 
QCPLayerlayer () const
 
bool antialiased () const
 
void setVisible (bool on)
 Sets the visibility of this layerable object. More...
 
bool setLayer (QCPLayer *layer)
 Sets the layer of this layerable object. More...
 
bool setLayer (const QString &layerName)
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Sets the layer of this layerable object by name. More...
 
void setAntialiased (bool enabled)
 Sets whether this object will be drawn antialiased or not. More...
 

Public Attributes

QCPItemPosition *const left
 
QCPItemPosition *const right
 
QCPItemAnchor *const center
 

Protected Types

enum  AnchorIndex { aiCenter }
 

Protected Member Functions

virtual void draw (QCPPainter *painter)
 
virtual QPointF anchorPixelPoint (int anchorId) const
 
QPen mainPen () const
 
- Protected Member Functions inherited from QCPlot::QCPAbstractItem
virtual QRect clipRect () const
 
virtual void applyDefaultAntialiasingHint (QCPPainter *painter) const
 
double distSqrToLine (const QPointF &start, const QPointF &end, const QPointF &point) const
 
double rectSelectTest (const QRectF &rect, const QPointF &pos, bool filledRect) const
 
QCPItemPositioncreatePosition (const QString &name)
 
QCPItemAnchorcreateAnchor (const QString &name, int anchorId)
 
- Protected Member Functions inherited from QCPlot::QCPLayerable
bool moveToLayer (QCPLayer *layer, bool prepend)
 
void applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const
 

Protected Attributes

QPen mPen
 
QPen mSelectedPen
 
double mLength
 
BracketStyle mStyle
 
- Protected Attributes inherited from QCPlot::QCPAbstractItem
bool mClipToAxisRect
 
QCPAxismClipKeyAxis
 
QCPAxismClipValueAxis
 
bool mSelectable
 
bool mSelected
 
QList< QCPItemPosition * > mPositions
 
QList< QCPItemAnchor * > mAnchors
 
- Protected Attributes inherited from QCPlot::QCPLayerable
bool mVisible
 
QCustomPlotmParentPlot
 
QCPLayermLayer
 
bool mAntialiased
 

Additional Inherited Members

- Signals inherited from QCPlot::QCPAbstractItem
void selectionChanged (bool selected)
 This signal is emitted when the selection state of this item has changed, either by user interaction or by a direct call to setSelected.
 

Detailed Description

A bracket for referencing/highlighting certain parts in the plot.

QCPItemBracket.png
Bracket example. Blue dotted circles are anchors, solid blue discs are positions.

It has two positions, left and right, which define the span of the bracket. If left is actually farther to the left than right, the bracket is opened to the bottom, as shown in the example image.

The bracket supports multiple styles via setStyle. The length, i.e. how far the bracket stretches away from the embraced span, can be controlled with setLength.

QCPItemBracket-length.png
Demonstrating the effect of different values for setLength, for styles bsCalligraphic and bsSquare. Anchors and positions are displayed for reference.

It provides an anchor center, to allow connection of other items, e.g. an arrow (QCPItemLine or QCPItemCurve) or a text label (QCPItemText), to the bracket.

Member Enumeration Documentation

Enumerator
bsSquare 

A brace with angled edges.

bsRound 

A brace with round edges.

bsCurly 

A curly brace.

bsCalligraphic 

A curly brace with varying stroke width giving a calligraphic impression.

Constructor & Destructor Documentation

QCPlot::QCPItemBracket::QCPItemBracket ( QCustomPlot parentPlot)

Creates a bracket item and sets default values.

The constructed item can be added to the plot with QCustomPlot::addItem.

Member Function Documentation

double QCPlot::QCPItemBracket::selectTest ( const QPointF &  pos) const
virtual

This function is used to decide whether a click hits an item 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 item. If the item is either invisible or the distance couldn't be determined, -1.0 is returned. setSelectable has no influence on the return value of this function.

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 99% of the selectionTolerance of the parent QCustomPlot). 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.

See Also
setSelected, QCustomPlot::setInteractions

Implements QCPlot::QCPAbstractItem.

void QCPlot::QCPItemBracket::setLength ( double  length)

Sets the length in pixels how far the bracket extends in the direction towards the embraced span of the bracket (i.e.

perpendicular to the left-right-direction)

QCPItemBracket-length.png
Demonstrating the effect of different values for setLength, for styles bsCalligraphic and bsSquare. Anchors and positions are displayed for reference.
void QCPlot::QCPItemBracket::setPen ( const QPen &  pen)

Sets the pen that will be used to draw the bracket.

Note that when the style is bsCalligraphic, only the color will be taken from the pen, the stroke and width are ignored. To change the apparent stroke width of a calligraphic bracket, use setLength, which has a similar effect.

See Also
setSelectedPen
void QCPlot::QCPItemBracket::setSelectedPen ( const QPen &  pen)

Sets the pen that will be used to draw the bracket when selected.

See Also
setPen, setSelected
void QCPlot::QCPItemBracket::setStyle ( QCPItemBracket::BracketStyle  style)

Sets the style of the bracket, i.e.

the shape/visual appearance.

See Also
setPen

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