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| virtual void | draw (QCPPainter *painter) Q_DECL_OVERRIDE |
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| QPen | mainPen () const |
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| QBrush | mainBrush () const |
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| virtual QCP::Interaction | selectionCategory () const Q_DECL_OVERRIDE |
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| virtual QRect | clipRect () const Q_DECL_OVERRIDE |
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| virtual void | applyDefaultAntialiasingHint (QCPPainter *painter) const Q_DECL_OVERRIDE |
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| virtual void | selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged) Q_DECL_OVERRIDE |
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| virtual void | deselectEvent (bool *selectionStateChanged) Q_DECL_OVERRIDE |
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| virtual QPointF | anchorPixelPosition (int anchorId) const |
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| double | rectDistance (const QRectF &rect, const QPointF &pos, bool filledRect) const |
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| QCPItemPosition * | createPosition (const QString &name) |
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| QCPItemAnchor * | createAnchor (const QString &name, int anchorId) |
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| virtual void | parentPlotInitialized (QCustomPlot *parentPlot) |
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| virtual void | mousePressEvent (QMouseEvent *event, const QVariant &details) |
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| virtual void | mouseMoveEvent (QMouseEvent *event, const QPointF &startPos) |
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| virtual void | mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos) |
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| virtual void | mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details) |
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| virtual void | wheelEvent (QWheelEvent *event) |
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| void | initializeParentPlot (QCustomPlot *parentPlot) |
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| void | setParentLayerable (QCPLayerable *parentLayerable) |
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| bool | moveToLayer (QCPLayer *layer, bool prepend) |
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| void | applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const |
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Item that sticks to QCPGraph data points.
Tracer example. Blue dotted circles are anchors, solid blue discs are positions.
The tracer can be connected with a QCPGraph via setGraph. Then it will automatically adopt the coordinate axes of the graph and update its position to be on the graph's data. This means the key stays controllable via setGraphKey, but the value will follow the graph data. If a QCPGraph is connected, note that setting the coordinates of the tracer item directly via position will have no effect because they will be overriden in the next redraw (this is when the coordinate update happens).
If the specified key in setGraphKey is outside the key bounds of the graph, the tracer will stay at the corresponding end of the graph.
With setInterpolating you may specify whether the tracer may only stay exactly on data points or whether it interpolates data points linearly, if given a key that lies between two data points of the graph.
The tracer has different visual styles, see setStyle. It is also possible to make the tracer have no own visual appearance (set the style to tsNone), and just connect other item positions to the tracer position (used as an anchor) via QCPItemPosition::setParentAnchor.
- Note
- The tracer position is only automatically updated upon redraws. So when the data of the graph changes and immediately afterwards (without a redraw) the position coordinates of the tracer are retrieved, they will not reflect the updated data of the graph. In this case updatePosition must be called manually, prior to reading the tracer coordinates.
| double QCPItemTracer::selectTest |
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const QPointF & |
pos, |
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bool |
onlySelectable, |
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QVariant * |
details = 0 |
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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.
- See also
- selectEvent, deselectEvent, mousePressEvent, wheelEvent, QCustomPlot::setInteractions
Implements QCPAbstractItem.
| void QCPItemTracer::setInterpolating |
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bool |
enabled | ) |
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Sets whether the value of the graph's data points shall be interpolated, when positioning the tracer.
If enabled is set to false and a key is given with setGraphKey, the tracer is placed on the data point of the graph which is closest to the key, but which is not necessarily exactly there. If enabled is true, the tracer will be positioned exactly at the specified key, and the appropriate value will be interpolated from the graph's data points linearly.
- See also
- setGraph, setGraphKey
| void QCPItemTracer::updatePosition |
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If the tracer is connected with a graph (setGraph), this function updates the tracer's position to reside on the graph data, depending on the configured key (setGraphKey).
It is called automatically on every redraw and normally doesn't need to be called manually. One exception is when you want to read the tracer coordinates via position and are not sure that the graph's data (or the tracer key with setGraphKey) hasn't changed since the last redraw. In that situation, call this function before accessing position, to make sure you don't get out-of-date coordinates.
If there is no graph set on this tracer, this function does nothing.
Public Member Functions inherited from QCPAbstractItem
1.8.15