DataPointPicker Class Reference

Let the user pick single data points from a plot. More...

#include <DataPointPicker.h>

List of all members.

Public Member Functions
	DataPointPicker (Graph *g, ApplicationWindow *app)
	Constructor.
QPointF	pick ()
	Let the user pick a single data point and return its coordinates.
	~DataPointPicker ()
	Destructor (exits the event loop).

Protected Slots
void	pointSelected (QwtPlotCurve *curve, int pointIndex)
	Handle selection of a point by the user.

Private Attributes
ApplicationWindow *	m_app
Graph *	m_graph
QEventLoop	m_picking_loop
QPointF	m_result

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Detailed Description

Let the user pick single data points from a plot.

While DataPickerTool does the actual selection work, DataPointPicker provides the framework necessary for script-driven usage. In particular, the event-oriented interface of DataPickerTool doesn't fit very well into the typical imparative structure of simple scripts. DataPointPicker bridges this gap by starting a new event loop (see QEventLoop) which allows the user to pick a data point while the script is still running within the main event loop. The inner event loop exits when the user has selected a data point, pick() returns its coordinates and control flows back to the caller.

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Constructor & Destructor Documentation

DataPointPicker::DataPointPicker	(	Graph *	g,
		ApplicationWindow *	app
	)

Constructor.

DataPointPicker::~DataPointPicker

(

)

Destructor (exits the event loop).

References m_picking_loop.

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Member Function Documentation

QPointF DataPointPicker::pick

(

)

Let the user pick a single data point and return its coordinates.

Starts a new event loop, which runs until either the user has selected a point or the DataPointPicker is destructed.

References DataPickerTool::Display, Graph::isPiePlot(), m_app, m_graph, m_picking_loop, m_result, pointSelected(), Graph::setActiveTool(), and Graph::validCurvesDataSize().

void DataPointPicker::pointSelected ( QwtPlotCurve *  curve, int  pointIndex  )

protectedslot

Handle selection of a point by the user.

References m_picking_loop, and m_result.

Referenced by pick().

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Member Data Documentation

ApplicationWindow* DataPointPicker::m_app

private

Referenced by pick().

Graph* DataPointPicker::m_graph

private

Referenced by pick().

QEventLoop DataPointPicker::m_picking_loop

private

Referenced by pick(), pointSelected(), and ~DataPointPicker().

QPointF DataPointPicker::m_result

private

Referenced by pick(), and pointSelected().

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

• scidavis/src/DataPointPicker.h
• scidavis/src/DataPointPicker.cpp