Base class for handling WorldCanvas position events. More...

#include <WCPositionEH.h>

Inheritance diagram for casa::WCPositionEH:

Public Member Functions
	WCPositionEH ()
	Default Constructor Required. More...

virtual void	operator() (const WCPositionEvent &ev)=0
	Default just prints the event to cout. More...

virtual	~WCPositionEH ()
	Destructor. More...

Detailed Description

Base class for handling WorldCanvas position events.

Prerequisite

WCPositionEvent
Understanding of Display library event-handling methodology

Etymology

WCPositionEH : WorldCanvas Position Event-Handler

Synopsis

WCPositionEH is a base class. Its operator() function is called by mechanisms within the Display Library when a keyboard key or mouse button is pressed while within the area of the world canvas.

Users must derive from this class and override the op () function to catch key and button presses. Positions in world, linear, and pixel coordinates are returned.

This base class does have a concrete implementation, namely to report to stdout events it receives. To effect this behaviour, create an instance this class and register it as an event-handler on a WorldCanvas.

Motivation

Provide the user with an object-oriented approach to event handling and include world-coordinate position information.

Example

see the test programs in Display/test.

Definition at line 75 of file WCPositionEH.h.

Constructor & Destructor Documentation

casa::WCPositionEH::WCPositionEH ( )

Default Constructor Required.

virtual casa::WCPositionEH::~WCPositionEH ( )

virtual

Destructor.

Member Function Documentation

virtual void casa::WCPositionEH::operator() ( const WCPositionEvent & ev )

pure virtual

Default just prints the event to cout.

Implemented in casa::WorldCanvasHolder, casa::Profile2dDD, casa::MultiWCTool, casa::DDDObject, casa::DDDEllipse, casa::DDDPolygon, casa::DDDRectangle, casa::SliceEH, casa::viewer::RegionToolManager, casa::AniPosEH, and casa::WCToolPosEH.

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

casa/code/display/DisplayEvents/WCPositionEH.h

Public Member Functions