Implementation of a Polygon. More...

#include <DSPoly.h>

Inheritance diagram for casa::DSPoly:

Public Member Functions
	DSPoly ()
	Constructors and destructor.
	DSPoly (const DSPoly &other)
	DSPoly (const Matrix< Float > &points, const Bool &handles=False, const Bool &drawHandles=False)
virtual	~DSPoly ()
virtual void	draw (PixelCanvas *pc)
	General DisplayShape functions.
virtual void	rotate (const Float &angle)
	Rotate the shape about its center by a set angle (angle in degrees).
virtual Bool	inObject (const Float &xPos, const Float &yPos)
	Is the supplied point within the DisplayShape?
virtual void	scale (const Float &scale)
	Scale the shape about its center by the scaleFactor.
virtual void	move (const Float &dX, const Float &dY)
virtual void	changePoint (const Vector< Float > &newLocation)
	Changes the closest point to the supplied location to that location.
virtual void	changePoint (const Vector< Float > &newLocation, const Int point)
	Changes the nth point making up the DisplayShape ot the specified location.
virtual void	setCenter (const Float &xPos, const Float &yPos)
	Sets the center of the DisplayShape.
virtual Vector< Float >	getCenter ()
	Returns the center of the DisplayShape (x,y).
virtual void	rotateAbout (const Float &angle, const Float &aboutX, const Float &aboutY)
virtual void	addPoint (const Vector< Float > &newPoint)
	Polygon specific functions, add, delete and set points, all in pixels.
virtual void	deletePoint (const Vector< Float > &removePoint)
virtual void	deletePoint (const Int nPoint)
virtual void	setPoints (const Matrix< Float > &newPoints)
virtual Record	getOptions ()
	Get and set options.
virtual Bool	setOptions (const Record &settings)
Protected Member Functions
virtual Matrix< Float >	getPoints ()
Private Member Functions
virtual void	setDefaultOptions ()

virtual Float	getArea ()
Private Attributes
Matrix< Float >	itsPoints

Vector< Float >	itsPolyCenter
Bool	itsValidPoints
Bool	itsValidCenter

Detailed Description

Implementation of a Polygon.

Prerequisite

Etymology

DSPoly is a method of managing the drawing of a polygon onto a PixelCanvas.

Synopsis

DSPoly allows for the management of a polygon, including the addition and deletion of points.

There are generally two ways to make DisplayShape(s); To create them in "one hit" by providing arguments to the constructor, or by using the default constructor and then the "setOptions" method. A simple interface for all classes inheriting from the DisplayShape class is provided by DisplayShapeInterface .

Motivation

To enable display of circles onto a pixel canvas.

Example

Definition at line 73 of file DSPoly.h.

Constructor & Destructor Documentation

casa::DSPoly::DSPoly ( )

Constructors and destructor.

casa::DSPoly::DSPoly ( const DSPoly & other )

casa::DSPoly::DSPoly	(	const Matrix< Float > &	points,
		const Bool &	handles = `False`,
		const Bool &	drawHandles = `False`
	)

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

Member Function Documentation

virtual void casa::DSPoly::addPoint ( const Vector< Float > & newPoint ) [virtual]

Polygon specific functions, add, delete and set points, all in pixels.

Add point decides the best place in the array to insert the new point. Similarly, deletePoints(const Vector<Float>& remove) deletes the point closest to that provided.

Reimplemented from casa::DisplayShape.

Reimplemented in casa::DSRectangle, casa::DSWorldPoly, and casa::DSScreenPoly.

virtual void casa::DSPoly::changePoint ( const Vector< Float > & newPos ) [virtual]