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Elements
Classes

Element Point

JXG.CoordsElement,JXG.GeometryElement
   ↳ JXG.Point
         ↳ Point

This element is used to provide a constructor for a general point. A free point is created if the given parent elements are all numbers and the property fixed is not set or set to false. If one or more parent elements is not a number but a string containing a GEONExT constraint or a function the point will be considered as constrained). That means that the user won't be able to change the point's position directly.

Defined in: point.js.
Extends JXG.Point.

Element Summary
Constructor Attributes Constructor Name and Description
 
Point
Attributes Summary
Field Attributes Field Name and Description
 
attractorDistance
If the distance of the point to one of its attractors is less than this number the point will be a glider on this attracting element.
 
attractors
List of attractor elements.
 
attractorUnit
Unit for attractorDistance and snatchDistance, used for magnetized points and for snapToPoints.
 
attractToGrid
If set to true, the point will only snap to (possibly invisibly) grid points when within Point#attractorDistance of such a grid point.
 
face
There are different point styles which differ in appearance.
 
ignoredSnapToPoints
List of elements which are ignored by snapToPoints.
 
infoboxDigits
Truncating rule for the digits in the infobox.
 
showInfobox
If true, the infobox is shown on mouse/pen over, if false not.
 
size
Size of a point, either in pixel or user coordinates.
 
sizeUnit
Unit for size.
 
snapSizeX
Defines together with Point#snapSizeY the grid the point snaps on to.
 
snapSizeY
Defines together with Point#snapSizeX the grid the point snaps on to.
 
snapToGrid
If set to true, the point will snap to a grid of integer multiples of Point#snapSizeX and Point#snapSizeY (in user coordinates).
 
snapToPoints
If set to true, the point will snap to the nearest point in distance of Point#attractorDistance.
 
snatchDistance
If the distance of the point to one of its attractors is at least this number the point will be released from being a glider on the attracting element.
 
style
This attribute was used to determined the point layout.
 
zoom
If true, the point size changes on zoom events.
Methods borrowed from class JXG.Point:
hasPoint, isOn, makeIntersection, normalizeFace, setStyle, update, updateRenderer, updateTransform
Methods borrowed from class JXG.GeometryElement:
_set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, addTransform, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, eval, evalVisProp, formatNumberLocale, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hide, hideElement, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setPositionDirectly, setProperty, show, showElement, updateVisibility, useLocale
Methods borrowed from class JXG.CoordsElement:
_anim, addAnchor, addConstraint, Coords, Dist, findClosestSnapValue, free, handleAttractors, handleSnapToPoints, makeGlider, moveAlong, moveTo, popSlideObject, setGliderPosition, setPositionByTransform, updateConstraint, updateCoords, updateGlider, updateGliderFromParent, visit, X, XEval, Y, YEval, Z, ZEval
Events borrowed from class JXG.GeometryElement:
attribute, attribute:key, down, drag, keydrag, mousedown, mousedrag, mousemove, mouseout, mouseover, mouseup, move, out, over, pendown, pendrag, penup, touchdown, touchdrag, touchup, up
Element Detail
Point
This element has no direct constructor. To create an instance of this element you have to call JXG.Board#create with type "point".

Possible parent array combinations are:
{Number|string|function} z   Optional
{Number|string|function} x
{Number|string|function} y

Parent elements can be two or three elements of type number, a string containing a GEONExT constraint, or a function which takes no parameter and returns a number. Every parent element determines one coordinate. If a coordinate is given by a number, the number determines the initial position of a free point. If given by a string or a function that coordinate will be constrained that means the user won't be able to change the point's position directly by mouse because it will be calculated automatically depending on the string or the function's return value. If two parent elements are given the coordinates will be interpreted as 2D affine Euclidean coordinates, if three such parent elements are given they will be interpreted as homogeneous coordinates.



A point can also be created providing a transformation or an array of transformations. The resulting point is a clone of the base point transformed by the given Transformation. {@see JXG.Transformation}.


Throws:
{Exception}
If the element cannot be constructed with the given parent objects an exception is thrown.
See:
Glider for a non-free point that is attached to another geometric element.
Examples:
// Create a free point using affine Euclidean coordinates
var p1 = board.create('point', [3.5, 2.0]);


				
				
// Create a constrained point using anonymous function
var p2 = board.create('point', [3.5, function () { return p1.X(); }]);




				
				
// Create a point using transformations
var trans = board.create('transform', [2, 0.5], {type:'scale'});
var p3 = board.create('point', [p2, trans]);




				
                

				


			

			


			
				

    				 Attribute Detail
				

				
					 
					


					{Number}
					attractorDistance

					

					

						If the distance of the point to one of its attractors is less
than this number the point will be a glider on this
attracting element.
If set to zero nothing happens.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						
							

							
Default Value:

							

								0.0
							

							

						

					

				
					 
					


					{Array}
					attractors

					

					

						List of attractor elements. If the distance of the point is less than
attractorDistance the point is made to glider of this element.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						
							

							
Default Value:

							

								empty
							

							

						

					

				
					 
					


					{String}
					attractorUnit

					

					

						Unit for attractorDistance and snatchDistance, used for magnetized points and for snapToPoints.
Possible values are 'screen' and 'user'.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Point#attractorDistance

							
							
Point#snatchDistance

							
							
Point#snapToPoints

							
							
Point#attractors

							
							

						
						
							

							
Default Value:

							

								'user'
							

							

						

					

				
					 
					


					{Boolean}
					attractToGrid

					

					

						If set to true, the point will only snap to (possibly invisibly) grid points
when within Point#attractorDistance of such a grid point.


The coordinates of the grid points are either integer multiples of snapSizeX and snapSizeY
(given in user coordinates, not pixels) or are the intersection points
of the major ticks of the boards default axes in case that snapSizeX, snapSizeY are negative.
						
							

							Defined in:  options.js.
						
						
					


					
					
					
board.create('point', [3, 3], { attractToGrid: true, attractorDistance: 10, attractorunit: 'screen' });





					
					

						
						
						
							

							
See:

							
							
Point#attractorDistance

							
							
Point#attractorUnit

							
							
Point#snapToGrid

							
							
Point#snapSizeX

							
							
Point#snapSizeY

							
							

						
						
							

							
Default Value:

							

								false
							

							

						

					

				
					 
					


					{String}
					face

					

					

						There are different point styles which differ in appearance.
Posssible values are



InputOutput


crossx


circleo


square, [][]


plus+


minus-


divide|


diamond<>


diamond2<> (bigger)


triangleup^, a, A


triangledownv


triangleleft<


triangleright>



						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
JXG.Point#setStyle

							
							

						
						
							

							
Default Value:

							

								circle
							

							

						

					

				
					 
					


					{Array}
					ignoredSnapToPoints

					

					

						List of elements which are ignored by snapToPoints.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						
							

							
Default Value:

							

								empty
							

							

						

					

				
					 
					


					{String| Number}
					infoboxDigits

					

					

						Truncating rule for the digits in the infobox.

						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
JXG#autoDigits

							
							
JXG#toFixed

							
							

						
						
							

							
Default Value:

							

								'auto'
							

							

						

					

				
					 
					


					{Boolean|String}
					showInfobox

					

					

						If true, the infobox is shown on mouse/pen over, if false not.
If the value is 'inherit', the value of
JXG.Board#showInfobox is taken.
true | false | 'inherit'
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
JXG.Board#showInfobox

							
							

						
						
							

							
Default Value:

							

								true
							

							

						

					

				
					 
					


					{Number}
					size

					

					

						Size of a point, either in pixel or user coordinates.
Means radius resp. half the width of a point (depending on the face).
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Point#face

							
							
JXG.Point#setStyle

							
							
Point#sizeUnit

							
							

						
						
							

							
Default Value:

							

								3
							

							

						

					

				
					 
					


					{String}
					sizeUnit

					

					

						Unit for size.
Possible values are 'screen' and 'user.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Point#size

							
							

						
						
							

							
Default Value:

							

								'screen'
							

							

						

					

				
					 
					


					{Number}
					snapSizeX

					

					

						Defines together with Point#snapSizeY the grid the point snaps on to.
It is given in user coordinates, not in pixels.
The point will only snap on integer multiples to snapSizeX in x and snapSizeY in y direction.
If this value is equal to or less than 0, it will use the grid displayed by the major ticks
of the default ticks of the default x axes of the board.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Point#snapToGrid

							
							
Point#snapSizeY

							
							
JXG.Board#defaultAxes

							
							

						
						
							

							
Default Value:

							

								1
							

							

						

					

				
					 
					


					{Number}
					snapSizeY

					

					

						Defines together with Point#snapSizeX the grid the point snaps on to.
It is given in user coordinates, not in pixels.
The point will only snap on integer multiples to snapSizeX in x and snapSizeY in y direction.
If this value is equal to or less than 0, it will use the grid displayed by the major ticks
of the default ticks of the default y axes of the board.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Point#snapToGrid

							
							
Point#snapSizeX

							
							
JXG.Board#defaultAxes

							
							

						
						
							

							
Default Value:

							

								1
							

							

						

					

				
					 
					


					{Boolean}
					snapToGrid

					

					

						If set to true, the point will snap to a grid of integer multiples of
Point#snapSizeX and Point#snapSizeY (in user coordinates).


The coordinates of the grid points are either integer multiples of snapSizeX and snapSizeY
(given in user coordinates, not pixels) or are the intersection points
of the major ticks of the boards default axes in case that snapSizeX, snapSizeY are negative.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Point#snapSizeX

							
							
Point#snapSizeY

							
							

						
						
							

							
Default Value:

							

								false
							

							

						

					

				
					 
					


					{Boolean}
					snapToPoints

					

					

						If set to true, the point will snap to the nearest point in distance of
Point#attractorDistance.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Point#attractorDistance

							
							

						
						
							

							
Default Value:

							

								false
							

							

						

					

				
					 
					


					{Number}
					snatchDistance

					

					

						If the distance of the point to one of its attractors is at least
this number the point will be released from being a glider on the
attracting element.
If set to zero nothing happens.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						
							

							
Default Value:

							

								0.0
							

							

						

					

				
					 
					


					{Number}
					style

					

					

						This attribute was used to determined the point layout. It was derived from GEONExT and was
replaced by Point#face and Point#size.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Point#face

							
							
Point#size

							
							

						
						
							

							
Default Value:

							

								5
							

							

						

					

				
					 
					


					{Boolean}
					zoom

					

					

						If true, the point size changes on zoom events.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						
							

							
Default Value:

							

								false
							

							

						

					
				
			


			


			


			

			


			
                
                

                    Attributes borrowed from other Elements
                


                

                
Attributes borrowed from class JXG.GeometryElement: 
aria, cssClass, dash, dashScale, draft, dragToTopOfLayer, element3D, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, highlight, highlightCssClass, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, isLabel, layer, lineCap, needsRegularUpdate, nonnegativeOnly, precision, priv, rotatable, scalable, shadow, strokeColor, strokeOpacity, strokeWidth, tabindex, trace, traceAttributes, transitionDuration, transitionProperties, visible, withLabel

                

                

                


				
				

					Fields borrowed from other Elements
				


				

				
Fields borrowed from class JXG.GeometryElement: 
_org_type, _pos, ancestors, baseElement, board, childElements, descendants, dump, elementClass, elType, hasLabel, highlighted, id, inherits, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsUpdate, notExistingParents, numTraces, parents, quadraticform, rendNode, stdform, subs, symbolic, traces, transformations, type, visProp, visPropCalc
Fields borrowed from class JXG.CoordsElement: 
coords, groups, isConstrained, needsUpdateFromParent, onPolygon, position, slideObject, slideObjects

				

				

				

				
				

					Methods borrowed from other Elements
				

				

				
Methods borrowed from class JXG.Point: 
hasPoint, isOn, makeIntersection, normalizeFace, setStyle, update, updateRenderer, updateTransform
Methods borrowed from class JXG.GeometryElement: 
_set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, addTransform, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, eval, evalVisProp, formatNumberLocale, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hide, hideElement, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setPositionDirectly, setProperty, show, showElement, updateVisibility, useLocale
Methods borrowed from class JXG.CoordsElement: 
_anim, addAnchor, addConstraint, Coords, Dist, findClosestSnapValue, free, handleAttractors, handleSnapToPoints, makeGlider, moveAlong, moveTo, popSlideObject, setGliderPosition, setPositionByTransform, updateConstraint, updateCoords, updateGlider, updateGliderFromParent, visit, X, XEval, Y, YEval, Z, ZEval

				

				

                

                
   				

    				Events borrowed from other Elements
                

                

                
Events borrowed from class JXG.GeometryElement: 
attribute, attribute:key, down, drag, keydrag, mousedown, mousedrag, mousemove, mouseout, mouseover, mouseup, move, out, over, pendown, pendrag, penup, touchdown, touchdrag, touchup, up

                

                

            

		




		

			
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