Multi WorldCanvas event-based zoomer. More...

#include <MWCRTZoomer.h>

Inheritance diagram for casa::MWCRTZoomer:

Public Member Functions
	MWCRTZoomer (Display::KeySym keysym=Display::K_Pointer_Button1)
	Constructor.
virtual	~MWCRTZoomer ()
	Destructor.
virtual void	unzoom ()
	This function resets the zoom.
virtual void	zoom (const Vector< Double > &linBlc, const Vector< Double > &linTrc)
	This function zooms with a given blc,trc.
virtual void	zoomIn (Double factor=2.)
	zoom in/out by given factor
virtual void	zoomOut (Double factor=2.)
Protected Member Functions
virtual void	doubleInside ()

virtual void	doubleOutside ()
virtual void	zoomed (const Vector< Double > &linBlc, const Vector< Double > &linTrc)
	This function is called when a zoom occurs.
Private Member Functions
void	getLinearCoords (Vector< Double > &blc, Vector< Double > &trc)
	get the linear coords of the current zoom box

Detailed Description

Multi WorldCanvas event-based zoomer.

Intended use:

Public interface

Review Status

<prerequisites> WCRectTool </prerequisites>

Etymology

MWCRTZoomer stands for WorldCanvas Rectangling Tool Zoomer

Synopsis

This class finalises the functionality in WCRectTool to implement event-based zooming on a WorldCanvas. Double clicking inside the constructed rectangle results in zooming in; double clicking outside the rectangle gives zooming out.

Example

Motivation

Zooming is an essential tool for interacting with data displays.

To Do

Nothing known

Definition at line 72 of file MWCRTZoomer.h.

Constructor & Destructor Documentation

casa::MWCRTZoomer::MWCRTZoomer ( Display::KeySym keysym = Display::K_Pointer_Button1 )

Constructor.

virtual casa::MWCRTZoomer::~MWCRTZoomer ( ) [virtual]

Destructor.

Member Function Documentation

virtual void casa::MWCRTZoomer::doubleInside ( ) [protected, virtual]

Handle double-click inside or outside the rectangle; called by the base class when these events occur. They execute zoom-in/zoom-out on the tool's active WC's (which should all have indentical linear coordinates for their draw areas--they certainly will have, after a zoom). Then the routines invoke the zoomed() callback, below.

Reimplemented from casa::MWCRectTool.

virtual void casa::MWCRTZoomer::doubleOutside ( ) [protected, virtual]

Reimplemented from casa::MWCRectTool.

void casa::MWCRTZoomer::getLinearCoords	(	Vector< Double > &	blc,
		Vector< Double > &	trc
	)		`[private]`

get the linear coords of the current zoom box

virtual void casa::MWCRTZoomer::unzoom ( ) [virtual]

This function resets the zoom.

Referenced by casa::QtDisplayPanel::unzoom().

virtual void casa::MWCRTZoomer::zoom	(	const Vector< Double > &	linBlc,
		const Vector< Double > &	linTrc
	)		`[virtual]`

This function zooms with a given blc,trc.

Referenced by casa::QtDisplayPanel::zoom().

virtual void casa::MWCRTZoomer::zoomed	(	const Vector< Double > &	linBlc,
		const Vector< Double > &	linTrc
	)		`[protected, virtual]`

This function is called when a zoom occurs.

It is supplied with the linear coords of the new zoom box, and thus can be implemented to do further actions, such as reporting the new zoom box to the application

virtual void casa::MWCRTZoomer::zoomIn ( Double factor = 2. ) [virtual]

zoom in/out by given factor

Referenced by casa::QtDisplayPanel::zoomIn().

virtual void casa::MWCRTZoomer::zoomOut ( Double factor = 2. ) [virtual]

Referenced by casa::QtDisplayPanel::zoomOut().

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

code/display/DisplayEvents/MWCRTZoomer.h

Public Member Functions

Protected Member Functions

Private Member Functions