A curved line from one point to another. More...
Public Functions | |
| QCPItemCurve (QCustomPlot *parentPlot) | |
| QPen | pen () const |
| QPen | selectedPen () const |
| QCPLineEnding | head () const |
| QCPLineEnding | tail () const |
| void | setPen (const QPen &pen) |
| void | setSelectedPen (const QPen &pen) |
| void | setHead (const QCPLineEnding &head) |
| void | setTail (const QCPLineEnding &tail) |
| virtual double | selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const |
 Public Functions inherited from QCPAbstractItem | |
| QCPAbstractItem (QCustomPlot *parentPlot) | |
| bool | clipToAxisRect () const |
| QCPAxisRect * | clipAxisRect () const |
| bool | selectable () const |
| bool | selected () const |
| void | setClipToAxisRect (bool clip) |
| void | setClipAxisRect (QCPAxisRect *rect) |
| Q_SLOT void | setSelectable (bool selectable) |
| Q_SLOT void | setSelected (bool selected) |
| QList< QCPItemPosition * > | positions () const |
| QList< QCPItemAnchor * > | anchors () const |
| QCPItemPosition * | position (const QString &name) const |
| QCPItemAnchor * | anchor (const QString &name) const |
| bool | hasAnchor (const QString &name) const |
| Public Functions inherited from QCPLayerable | |
| QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=0) | |
| bool | visible () const |
| QCustomPlot * | parentPlot () const |
| QCPLayerable * | parentLayerable () const |
| QCPLayer * | layer () const |
| bool | antialiased () const |
| void | setVisible (bool on) |
| Q_SLOT bool | setLayer (QCPLayer *layer) |
| bool | setLayer (const QString &layerName) |
| void | setAntialiased (bool enabled) |
| bool | realVisibility () const |
Public Members | |
| QCPItemPosition *const | start |
| QCPItemPosition *const | startDir |
| QCPItemPosition *const | endDir |
| QCPItemPosition *const | end |
Protected Functions | |
| virtual void | draw (QCPPainter *painter) |
| QPen | mainPen () const |
| Protected Functions inherited from QCPAbstractItem | |
| virtual QCP::Interaction | selectionCategory () const |
| virtual QRect | clipRect () const |
| virtual void | applyDefaultAntialiasingHint (QCPPainter *painter) const |
| virtual void | selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged) |
| virtual void | deselectEvent (bool *selectionStateChanged) |
| virtual QPointF | anchorPixelPoint (int anchorId) const |
| double | distSqrToLine (const QPointF &start, const QPointF &end, const QPointF &point) const |
| double | rectSelectTest (const QRectF &rect, const QPointF &pos, bool filledRect) const |
| QCPItemPosition * | createPosition (const QString &name) |
| QCPItemAnchor * | createAnchor (const QString &name, int anchorId) |
| Protected 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 |
Additional Inherited Members | |
| Signals inherited from QCPAbstractItem | |
| void | selectionChanged (bool selected) |
| void | selectableChanged (bool selectable) |
| Signals inherited from QCPLayerable | |
| void | layerChanged (QCPLayer *newLayer) |
Detailed Description
A curved line from one point to another.
It has four positions, start and end, which define the end points of the line, and two control points which define the direction the line exits from the start and the direction from which it approaches the end: startDir and endDir.
With setHead and setTail you may set different line ending styles, e.g. to create an arrow.
Often it is desirable for the control points to stay at fixed relative positions to the start/end point. This can be achieved by setting the parent anchor e.g. of startDir simply to start, and then specify the desired pixel offset with QCPItemPosition::setCoords on startDir.
Constructor & Destructor Documentation
| QCPItemCurve::QCPItemCurve | ( | QCustomPlot * | parentPlot | ) |
Creates a curve item and sets default values.
The constructed item can be added to the plot with QCustomPlot::addItem.
Member Function Documentation
| void QCPItemCurve::setPen | ( | const QPen & | pen | ) |
Sets the pen that will be used to draw the line
- See Also
- setSelectedPen
| void QCPItemCurve::setSelectedPen | ( | const QPen & | pen | ) |
Sets the pen that will be used to draw the line when selected
- See Also
- setPen, setSelected
| void QCPItemCurve::setHead | ( | const QCPLineEnding & | head | ) |
Sets the line ending style of the head. The head corresponds to the end position.
Note that due to the overloaded QCPLineEnding constructor, you may directly specify a QCPLineEnding::EndingStyle here, e.g.
- See Also
- setTail
| void QCPItemCurve::setTail | ( | const QCPLineEnding & | tail | ) |
Sets the line ending style of the tail. The tail corresponds to the start position.
Note that due to the overloaded QCPLineEnding constructor, you may directly specify a QCPLineEnding::EndingStyle here, e.g.
- See Also
- setHead
|
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 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.
You may pass 0 as details to indicate that you are not interested in those selection details.
Implements QCPAbstractItem.
|
protectedvirtual |
Draws this item with the provided painter.
The cliprect of the provided painter is set to the rect returned by clipRect before this function is called. The clipRect depends on the clipping settings defined by setClipToAxisRect and setClipAxisRect.
Implements QCPAbstractItem.
|
protected |
Returns the pen that should be used for drawing lines. Returns mPen when the item is not selected and mSelectedPen when it is.
The documentation for this class was generated from the following files:
- src/items/item-curve.h
- src/items/item-curve.cpp