Class JXG.Coords

↳ JXG.Coords

This is the Coordinates class. All members a coordinate has to provide are defined here.

Defined in: coords.js.

Class Summary
Constructor Attributes	Constructor Name and Description
	JXG.Coords(method, coordinates, board, emitter) Constructs a new Coordinates object.

Field Summary
Field Attributes	Field Name and Description
	board Stores the board the object is used on.
	emitter If true, this coordinates object will emit update events every time the coordinates are set.
	eventHandlers Holds the registered event handlers.
	scrCoords Stores coordinates for screen view as homogeneous coordinates.
	usrCoords Stores coordinates for user view as homogeneous coordinates.

Method Summary
Method Attributes	Method Name and Description
	distance(coord_type, coordinates) Calculate distance of one point to another.
<private>	normalizeUsrCoords() Normalize homogeneous coordinates
	off(event, handler) Unregister an event handler.
	on(event, handler, context) Register a new event handler.
<private>	screen2usr() Compute user coordinates out of given screen coordinates.
	setCoordinates(coord_type, coordinates, doRound, noevent) Set coordinates by either user coordinates or screen coordinates and recalculate the other one.
	triggerEventHandlers(event, args) Triggers all event handlers of this element for a given event.
<private>	usr2screen(doRound) Compute screen coordinates out of given user coordinates.

Event Summary
Event Attributes	Event Name and Description
	update(ou, os) Triggered whenever the coordinates change.

Class Detail

JXG.Coords(method, coordinates, board, emitter)

Constructs a new Coordinates object.

Parameters:
{Number} method: The type of coordinates given by the user. Accepted values are COORDS_BY_SCREEN and COORDS_BY_USER.
{Array} coordinates: An array of affine coordinates.
{JXG.Board} board: A reference to a board.
emitter

Field Detail

{JXG.Board} board

Stores the board the object is used on.

emitter

If true, this coordinates object will emit update events every time the coordinates are set.

Default Value:: true

{Object} eventHandlers

Holds the registered event handlers.
Defined in: event.js.

{Array} scrCoords

Stores coordinates for screen view as homogeneous coordinates.

{Array} usrCoords

Stores coordinates for user view as homogeneous coordinates.

Method Detail

{Number} distance(coord_type, coordinates)

Calculate distance of one point to another.

Parameters:
{Number} coord_type: The type of coordinates used here. Possible values are JXG.COORDS_BY_USER and JXG.COORDS_BY_SCREEN.
{JXG.Coords} coordinates: The Coords object to which the distance is calculated.

Returns:: {Number} The distance

<private> normalizeUsrCoords()

Normalize homogeneous coordinates

off(event, handler)

Unregister an event handler.
Defined in: event.js.

Parameters:
{String} event
{Function} handler Optional

Returns:: Reference to the object.

on(event, handler, context)

Register a new event handler. For a list of possible events see documentation of the elements and objects implementing the EventEmitter interface.
Defined in: event.js.

Parameters:
{String} event
{Function} handler
{Object} context Optional: The context the handler will be called in, default is the element itself.

Returns:: Reference to the object.

<private> screen2usr()

Compute user coordinates out of given screen coordinates.

{JXG.Coords} setCoordinates(coord_type, coordinates, doRound, noevent)

Set coordinates by either user coordinates or screen coordinates and recalculate the other one.

Parameters:
{Number} coord_type: The type of coordinates used here. Possible values are COORDS_BY_USER and COORDS_BY_SCREEN.
{Array} coordinates: An array of affine coordinates the Coords object is set to.
{Boolean} doRound Optional, Default: true: flag If true or null round the coordinates in usr2screen. This is used in smooth curve plotting. The IE needs rounded coordinates. Id doRound==false we have to round in updatePathString.
{Boolean} noevent Optional, Default: false

Returns:: {JXG.Coords} Reference to the coords object.

triggerEventHandlers(event, args)

Triggers all event handlers of this element for a given event.
Defined in: event.js.

Parameters:
{Array} event
{Array} args: The arguments passed onto the event handler

Returns:: Reference to the object.

<private> usr2screen(doRound)

Compute screen coordinates out of given user coordinates.

Parameters:
doRound

Event Detail

update(ou, os)

Triggered whenever the coordinates change.

Parameters:
{Array} ou: Old user coordinates
{Array} os: Old screen coordinates

JSXGraph Reference

JavaScript must be enabled in order for you to use JSXGraph and JSXGraph reference. However, it seems JavaScript is either disabled or not supported by your browser.

Elements

Classes

Class JXG.Coords