Class JXG.GeometryElement

↳ JXG.GeometryElement

This is the basic class for geometry elements like points, circles and lines.

Defined in: element.js.

Class Summary
Constructor Attributes	Constructor Name and Description
	JXG.GeometryElement(board, attributes, type, oclass) Constructs a new GeometryElement object.

Attributes Summary
Field Attributes	Field Name and Description
	dash Determines the elements border-style.
	dashScale If true, the dash pattern is multiplied by strokeWidth / 2.
	draft If draft.draft: true the element will be drawn in grey scale colors (as default) to visualize that it's only a draft.
	dragToTopOfLayer If the element is dragged it will be moved on mousedown or touchstart to the top of its layer.
	fillColor The fill color of this geometry element.
	fillOpacity Opacity for fill color.
	fixed If true the element is fixed and can not be dragged around.
	frozen If true the element is fixed and can not be dragged around.
	gradient Gradient type.
	gradientAngle Angle (in radians) of the gradiant in case the gradient is of type 'linear'.
	gradientCX From the SVG specification: ‘cx’, ‘cy’ and ‘r’ define the largest (i.e.
	gradientCY From the SVG specification: ‘cx’, ‘cy’ and ‘r’ define the largest (i.e.
	gradientEndOffset The gradientEndOffset attribute is a number (ranging from 0 to 1) which indicates where the second gradient stop is placed, see the SVG specification for more information.
	gradientFR This attribute defines the radius of the start circle of the radial gradient.
	gradientFX ‘fx’ and ‘fy’ define the focal point for the radial gradient.
	gradientFY y-coordinate of the circle center for the second color in case of gradient 'radial'.
	gradientR From the SVG specification: ‘cx’, ‘cy’ and ‘r’ define the largest (i.e.
	gradientSecondColor Second color for gradient.
	gradientSecondOpacity Opacity of second gradient color.
	gradientStartOffset The gradientStartOffset attribute is a number (ranging from 0 to 1) which indicates where the first gradient stop is placed, see the SVG specification for more information.
	highlight
	highlightFillColor The fill color of the given geometry element when the mouse is pointed over it.
	highlightFillOpacity Opacity for fill color when the object is highlighted.
	highlightStrokeColor The stroke color of the given geometry element when the user moves the mouse over it.
	highlightStrokeOpacity Opacity for stroke color when the object is highlighted.
	highlightStrokeWidth Width of the element's stroke when the mouse is pointed over it.
<private>	isLabel
	layer Display layer which will contain the element.
	lineCap Line endings (linecap) of a stroke element, i.e.
	needsRegularUpdate If this is set to true, the element is updated in every update call of the board.
	nonnegativeOnly If some size of an element is controlled by a function, like the circle radius or segments of fixed length, this attribute controls what happens if the value is negative.
	precision Precision options for JSXGraph elements.
	priv A private element will be inaccessible in certain environments, e.g.
	rotatable Determines whether two-finger manipulation may rotate this object.
	scalable Determines whether two-finger manipulation of this object may change its size.
	shadow If enabled:true the (stroke) element will get a customized shadow.
	snapToGrid Snaps the element or its parents to the grid.
	strokeColor The stroke color of the given geometry element.
	strokeOpacity Opacity for element's stroke color.
	strokeWidth Width of the element's stroke.
	tabindex Controls if an element can get the focus with the tab key.
	trace If true the element will be traced, i.e.
	traceAttributes Extra visual properties for traces of an element
	transitionDuration Transition duration (in milliseconds) for certain cahnges of properties like color and opacity.
	transitionProperties Properties which change smoothly in the time set in transitionDuration.
	viewport Set individual viewport for an element.
	visible If false the element won't be visible on the board, otherwise it is shown.
	withLabel If true a label will display the element's name.

Field Summary
Field Attributes	Field Name and Description
<private> <constant>	_org_type Original type of the element at construction time.
<private>	_pos The position of this element inside the JXG.Board#objectsList.
	ancestors Elements on which this element depends on are stored here.
<private>	baseElement
	board Reference to the board associated with the element.
	childElements Stores all dependent objects to be updated when this point is moved.
	descendants Elements depending on this element are stored here.
	dump The element is saved with an explicit entry in the file (`true`) or implicitly via a composition.
<constant>	elementClass The element's class.
	elType The string used with JXG.Board#create
	hasLabel If element has a label subelement then this property will be set to true.
	highlighted True, if the element is currently highlighted.
	id Unique identifier for the element.
	inherits Inherits contains the subelements, which may have an attribute (in particular the attribute "visible") having value 'inherit'.
	isDraggable Controls if this element can be dragged.
	isReal If element is in two dimensional real space this is true, else false.
	lastDragTime Time stamp containing the last time this element has been dragged.
	methodMap The methodMap determines which methods can be called from within JessieCode and under which name it can be used.
	mouseover Is the mouse over this element?
	name Not necessarily unique name for the element.
	needsUpdate Controls if updates are necessary
	notExistingParents Stores all Intersection Objects which in this moment are not real and so hide this element.
	numTraces Counts the number of objects drawn as part of the trace of the element.
	parents Ids of elements on which this element depends directly are stored here.
	quadraticform Quadratic form representation of circles (and conics)
	rendNode Stores the SVG (or VML) rendering node for the element.
	stdform [c, b0, b1, a, k, r, q0, q1] See A.E.
	subs Subs contains the subelements, created during the create method.
	symbolic Stores variables for symbolic computations
	traces Keeps track of all objects drawn as part of the trace of the element.
	transformations Stores the transformations which are applied during update in an array
<constant>	type Type of the element.
	visProp An associative array containing all visual properties.
	visPropCalc An associative array containing visual properties which are calculated from the attribute values (i.e.

Method Summary
Method Attributes	Method Name and Description
<private>	_set(key, value) Sets the value of attribute `key` to `value`.
	addChild(obj) Add an element as a child to the current element.
<private>	addDescendants(obj)
<static>	JXG.GeometryElement.addEvent() Alias of JXG.EventEmitter.on.
	addParents(parents) Adds ids of elements to the array this.parents.
<private>	addParentsFromJCFunctions(function_array) Add dependence on elements in JessieCode functions.
	addRotation(angle) Rotate texts or images by a given degree.
	addTicks(ticks) Adds ticks to this line or curve.
	addTransform(transform) Add transformations to this element.
	animate(hash, time, options) Animates properties for that object like stroke or fill color, opacity and maybe even more later.
	bounds() Dimensions of the smallest rectangle enclosing the element.
	clearTrace() Removes all objects generated by the trace function.
	cloneToBackground() Copy the element to background.
<private>	countChildren() Counts the direct children of an object without counting labels.
<private>	createGradient() Creates a gradient nodes in the renderer.
	createLabel() Creates a label element for this geometry element.
<private>	draggable() Decides whether an element can be dragged.
	formatNumberLocale(value, digits) Format a number according to the locale set in the attribute "intl".
<private>	fullUpdate(visible) Run through the full update chain of an element.
	generatePolynomial() Array of strings containing the polynomials defining the element.
	getAttribute(key) Get the value of the property `key`.
	getAttributes() Retrieve a copy of the current visProp.
	getLabelAnchor() Returns the coords object where the label of the element shall be drawn.
	getName() Returns the elements name.
	getParents() List of the element ids resp.
<deprecated>	getProperty() Deprecated alias for JXG.GeometryElement#getAttribute.
<private>	getSnapSizes() Determine values of snapSizeX and snapSizeY.
	getTextAnchor() Returns the coords object where a text that is bound to the element shall be drawn.
	getType() The type of the element as used in JXG.Board#create.
	handleSnapToGrid(force, fromParent) Move an element to its nearest grid point.
	hasPoint(x, y) Checks whether (x,y) is near the element.
	hide() Hide the element.
	hideElement() Hide the element.
	noHighlight() Uses the "normal" properties of the element.
<private>	normalize() Normalize the element's standard form.
<private>	prepareUpdate() Notify all child elements for updates.
	remove() Removes the element from the construction.
	removeAllTicks() Removes all ticks from a line or curve.
	removeChild(obj) Remove an element as a child from the current element.
<private>	removeDescendants(obj) Removes the given object from the descendants list of this object and all its child objects.
<static>	JXG.GeometryElement.removeEvent() Alias of JXG.EventEmitter.off.
	removeTicks(tick) Removes ticks identified by parameter named tick from this line or curve.
<private>	resolveShortcuts(attributes) Resolves attribute shortcuts like `color` and expands them, e.g.
	setArrow(firstArrow, lastArrow) Determines whether the element has arrows at start or end of the arc.
	setAttribute(attributes) Sets an arbitrary number of attributes.
<private>	setDash(dash) Set the dash style of an object.
<private>	setDisplayRendNode(val) Show the element or hide it.
	setLabel(str) Sets a label and its text If label doesn't exist, it creates one
	setLabelText(str) Updates the element's label text, strips all html.
	setName(str) Updates the element's label text and the element's attribute "name", strips all html.
	setParents(parents) Sets ids of elements to the array this.parents.
	setPosition(method, coords) Translates the object by `(x, y)`.
	setPositionDirectly(method, coords, oldcoords) Moves an element by the difference of two coordinates.
<deprecated>	setProperty() Deprecated alias for JXG.GeometryElement#setAttribute.
	show() Make the element visible.
	showElement() Make the element visible.
<private>	snapToPoints() Snaps the element to points.
	update() General update method.
<private>	updateRenderer() Provide updateRenderer method.
<private>	updateVisibility(parent_val) Set the visibility of an element.
	useLocale() Checks if locale is enabled in the attribute.

Event Summary
Event Attributes	Event Name and Description
	attribute(o, el) Notify every time an attribute is changed.
	attribute:key(val, nval, el) This is a generic event handler.
	down(e) Whenever the user starts to touch or click an element.
	drag(e) This event is fired whenever the user drags an element.
	keydrag(e) This event is fired whenever the user drags the element by pressing arrow keys on the keyboard.
	mousedown(e) Whenever the user starts to click an element.
	mousedrag(e) This event is fired whenever the user drags the element with a mouse.
	mousemove(e) This event is fired whenever the user is moving the mouse over an element.
	mouseout(e) This event is fired whenever the user puts the mouse away from an element.
	mouseover(e) This event is fired whenever the user puts the mouse over an element.
	mouseup(e) Whenever the user releases the mousebutton over an element.
	move(e) This event is fired whenever the user is moving over an element.
	out(e) This event is fired whenever the user is leaving an element.
	over(e) This event is fired whenever the user is hovering over an element.
	pendown(e) Whenever the user taps an element with the pen.
	pendrag(e) This event is fired whenever the user drags the element with a pen.
	penup(e) Whenever the user lifts the pen over an element.
	touchdown(e) Whenever the user starts to touch an element.
	touchdrag(e) This event is fired whenever the user drags the element on a touch device.
	touchup(e) Whenever the user stops touching an element.
	up(e) Whenever the user stops to touch or click an element.

Class Detail

JXG.GeometryElement(board, attributes, type, oclass)

Constructs a new GeometryElement object.

Parameters:
{JXG.Board} board: Reference to the board the element is constructed on.
{Object} attributes: Hash of attributes and their values.
{Number} type: Element type (a JXG.OBJECT_TYPE_ value).
{Number} oclass: The element's class (a JXG.OBJECT_CLASS_ value).

Attribute Detail

{Number} dash

Determines the elements border-style. Possible values are:

0 for a solid line
1 for a dotted line
2 for a line with small dashes
3 for a line with medium dashes
4 for a line with big dashes
5 for a line with alternating medium and big dashes and large gaps
6 for a line with alternating medium and big dashes and small gaps
7 for a dotted line. Needs JXG.GeometryElement#linecap set to "round" for round dots.

The dash patterns are defined in JXG.AbstractRenderer#dashArray.
Defined in: options.js.

See:: JXG.GeometryElement#lineCap; JXG.AbstractRenderer#dashArray

Default Value:: 0

{Boolean} dashScale

If true, the dash pattern is multiplied by strokeWidth / 2.
Defined in: options.js.

See:: JXG.GeometryElement#dash; JXG.AbstractRenderer#dashArray

Default Value:: false

{Object} draft

If draft.draft: true the element will be drawn in grey scale colors (as default) to visualize that it's only a draft.
Defined in: options.js.

Default Value:: JXG.Options.elements.draft#draft

{Boolean} dragToTopOfLayer

If the element is dragged it will be moved on mousedown or touchstart to the top of its layer. Works only for SVG renderer and for simple elements consisting of one SVG node.
Defined in: options.js.

var li1 = board.create('line', [1, 1, 1], {strokeWidth: 20, dragToTopOfLayer: true});
var li2 = board.create('line', [1, -1, 1], {strokeWidth: 20, strokeColor: 'red'});

Default Value:: false

{String} fillColor

The fill color of this geometry element.
Defined in: options.js.

See:: JXG.GeometryElement#highlightFillColor; JXG.GeometryElement#fillOpacity; JXG.GeometryElement#highlightFillOpacity

Default Value:: JXG.palette.red

{Number} fillOpacity

Opacity for fill color.
Defined in: options.js.

See:: JXG.GeometryElement#fillColor; JXG.GeometryElement#highlightFillColor; JXG.GeometryElement#highlightFillOpacity

Default Value:: 1

{Boolean} fixed

If true the element is fixed and can not be dragged around. The element will be repositioned on zoom and moveOrigin events.
Defined in: options.js.

Default Value:: false

{Boolean} frozen

If true the element is fixed and can not be dragged around. The element will even stay at its position on zoom and moveOrigin events. Only free elements like points, texts, images, curves can be frozen. For slider elements, the subobjects point1 and point2 have to be "frozen".
Defined in: options.js.

var txt = board.create('text', [1, 2, 'Hello'], {frozen: true, fontSize: 24});
var sli = board.create('slider', [[-4, 4], [-1.5, 4], [-10, 1, 10]], {
    name:'a',
    point1: {frozen: true},
    point2: {frozen: true}
});

Default Value:: false

{String} gradient

Gradient type. Possible values are 'linear'. 'radial' or null.
Defined in: options.js.

    var a = board.create('slider', [[0, -0.2], [3.5, -0.2], [0, 0, 2 * Math.PI]], {name: 'angle'});
    var b = board.create('slider', [[0, -0.4], [3.5, -0.4], [0, 0, 1]], {name: 'offset1'});
    var c = board.create('slider', [[0, -0.6], [3.5, -0.6], [0, 1, 1]], {name: 'offset2'});

    var pol = board.create('polygon', [[0, 0], [4, 0], [4,4], [0,4]], {
                fillOpacity: 1,
                fillColor: 'yellow',
                gradient: 'linear',
                gradientSecondColor: 'blue',
                gradientAngle: function() { return a.Value(); },
                gradientStartOffset: function() { return b.Value(); },
                gradientEndOffset: function() { return c.Value(); },
                hasInnerPoints: true
        });

    var cx = board.create('slider', [[0, -.2], [3.5, -.2], [0, 0.5, 1]], {name: 'cx, cy'});
    var fx = board.create('slider', [[0, -.4], [3.5, -.4], [0, 0.5, 1]], {name: 'fx, fy'});
    var o1 = board.create('slider', [[0, -.6], [3.5, -.6], [0, 0.0, 1]], {name: 'offset1'});
    var o2 = board.create('slider', [[0, -.8], [3.5, -.8], [0, 1, 1]], {name: 'offset2'});
    var r = board.create('slider', [[0, -1], [3.5, -1], [0, 0.5, 1]], {name: 'r'});
    var fr = board.create('slider', [[0, -1.2], [3.5, -1.2], [0, 0, 1]], {name: 'fr'});

    var pol = board.create('polygon', [[0, 0], [4, 0], [4,4], [0,4]], {
                fillOpacity: 1,
                fillColor: 'yellow',
                gradient: 'radial',
                gradientSecondColor: 'blue',
                gradientCX: function() { return cx.Value(); },
                gradientCY: function() { return cx.Value(); },
                gradientR: function() { return r.Value(); },
                gradientFX: function() { return fx.Value(); },
                gradientFY: function() { return fx.Value(); },
                gradientFR: function() { return fr.Value(); },
                gradientStartOffset: function() { return o1.Value(); },
                gradientEndOffset: function() { return o2.Value(); },
                hasInnerPoints: true
    });

See:: JXG.GeometryElement#gradientSecondColor; JXG.GeometryElement#gradientSecondOpacity

Default Value:: null

{Number} gradientAngle

Angle (in radians) of the gradiant in case the gradient is of type 'linear'. If the angle is 0, the first color is on the left and the second color is on the right. If the angle is π/2 the first color is on top and the second color at the bottom.
Defined in: options.js.

See:: JXG.GeometryElement#gradient

Default Value:: 0

{Number} gradientCX

From the SVG specification: ‘cx’, ‘cy’ and ‘r’ define the largest (i.e., outermost) circle for the radial gradient. The gradient will be drawn such that the 100% gradient stop is mapped to the perimeter of this largest (i.e., outermost) circle. For radial gradients in canvas this is the value 'x1'. Takes a value between 0 and 1.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientCY; JXG.GeometryElement#gradientR

Default Value:: 0.5

{Number} gradientCY

From the SVG specification: ‘cx’, ‘cy’ and ‘r’ define the largest (i.e., outermost) circle for the radial gradient. The gradient will be drawn such that the 100% gradient stop is mapped to the perimeter of this largest (i.e., outermost) circle. For radial gradients in canvas this is the value 'y1'. Takes a value between 0 and 1.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientCX; JXG.GeometryElement#gradientR

Default Value:: 0.5

{Number} gradientEndOffset

The gradientEndOffset attribute is a number (ranging from 0 to 1) which indicates where the second gradient stop is placed, see the SVG specification for more information. For linear gradients, this attribute represents a location along the gradient vector. For radial gradients, it represents a percentage distance from (fx,fy) to the edge of the outermost/largest circle.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientStartOffset

Default Value:: 1.0

{Number} gradientFR

This attribute defines the radius of the start circle of the radial gradient. The gradient will be drawn such that the 0% <stop> is mapped to the perimeter of the start circle. For radial gradients in canvas this is the value 'r0'. Takes a value between 0 and 1.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientFX; JXG.GeometryElement#gradientFY

Default Value:: 0.0

{Number} gradientFX

‘fx’ and ‘fy’ define the focal point for the radial gradient. The gradient will be drawn such that the 0% gradient stop is mapped to (fx, fy). For radial gradients in canvas this is the value 'x0'. Takes a value between 0 and 1.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientFY; JXG.GeometryElement#gradientFR

Default Value:: 0.5

{Number} gradientFY

y-coordinate of the circle center for the second color in case of gradient 'radial'. (The attribute fy in SVG) For radial gradients in canvas this is the value 'y0'. Takes a value between 0 and 1.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientFX; JXG.GeometryElement#gradientFR

Default Value:: 0.5

{Number} gradientR

From the SVG specification: ‘cx’, ‘cy’ and ‘r’ define the largest (i.e., outermost) circle for the radial gradient. The gradient will be drawn such that the 100% gradient stop is mapped to the perimeter of this largest (i.e., outermost) circle. For radial gradients in canvas this is the value 'r1'. Takes a value between 0 and 1.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientCX; JXG.GeometryElement#gradientCY

Default Value:: 0.5

{String} gradientSecondColor

Second color for gradient.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientSecondOpacity

Default Value:: '#ffffff'

{Number} gradientSecondOpacity

Opacity of second gradient color. Takes a value between 0 and 1.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientSecondColor

Default Value:: 1

{Number} gradientStartOffset

The gradientStartOffset attribute is a number (ranging from 0 to 1) which indicates where the first gradient stop is placed, see the SVG specification for more information. For linear gradients, this attribute represents a location along the gradient vector. For radial gradients, it represents a percentage distance from (fx,fy) to the edge of the outermost/largest circle.
Defined in: options.js.

See:: JXG.GeometryElement#gradient; JXG.GeometryElement#gradientEndOffset

Default Value:: 0.0

{Boolean} highlight

Defined in: options.js.

Default Value:: true

{String} highlightFillColor

The fill color of the given geometry element when the mouse is pointed over it.
Defined in: options.js.

See:: JXG.GeometryElement#fillColor; JXG.GeometryElement#fillOpacity; JXG.GeometryElement#highlightFillOpacity

Default Value:: 'none'

{Number} highlightFillOpacity

Opacity for fill color when the object is highlighted.
Defined in: options.js.

See:: JXG.GeometryElement#fillColor; JXG.GeometryElement#highlightFillColor; JXG.GeometryElement#fillOpacity

Default Value:: 1

{String} highlightStrokeColor

The stroke color of the given geometry element when the user moves the mouse over it.
Defined in: options.js.

See:: JXG.GeometryElement#strokeColor; JXG.GeometryElement#strokeWidth; JXG.GeometryElement#strokeOpacity; JXG.GeometryElement#highlightStrokeOpacity

Default Value:: '#c3d9ff'

{Number} highlightStrokeOpacity

Opacity for stroke color when the object is highlighted.
Defined in: options.js.

See:: JXG.GeometryElement#strokeColor; JXG.GeometryElement#highlightStrokeColor; JXG.GeometryElement#strokeWidth; JXG.GeometryElement#strokeOpacity

Default Value:: 1

{Number} highlightStrokeWidth

Width of the element's stroke when the mouse is pointed over it.
Defined in: options.js.

See:: JXG.GeometryElement#strokeColor; JXG.GeometryElement#highlightStrokeColor; JXG.GeometryElement#strokeOpacity; JXG.GeometryElement#highlightStrokeOpacity; JXG.GeometryElement#highlightFillColor

Default Value:: 2

<private> isLabel

Defined in: options.js.

Default Value:: false

layer

Display layer which will contain the element.
Defined in: options.js.

See:: JXG.Options#layer

Default Value:: See JXG.Options#layer

{String} lineCap

Line endings (linecap) of a stroke element, i.e. line, circle, curve. Possible values are:

'butt',
'round',
'square'.

Not available for VML renderer.
Defined in: options.js.

Default Value:: 'butt'

{Boolean} needsRegularUpdate

If this is set to true, the element is updated in every update call of the board. If set to false, the element is updated only after zoom events or more generally, when the bounding box has been changed. Examples for the latter behavior should be axes.
Defined in: options.js.

See:: JXG.GeometryElement#needsRegularUpdate

Default Value:: true

{Boolean} nonnegativeOnly

If some size of an element is controlled by a function, like the circle radius or segments of fixed length, this attribute controls what happens if the value is negative. By default, the absolute value is taken. If true, the maximum of 0 and the value is used.
Defined in: options.js.

var slider = board.create('slider', [[4, -3], [4, 3], [-4, 1, 4]], { name: 'a'});
var circle = board.create('circle', [[-1, 0], 1], {
    nonnegativeOnly: true
});
circle.setRadius('a');         // Use JessieCode
var seg = board.create('segment', [[-4, 3], [0, 3], () => slider.Value()], {
    point1: {visible: true},
    point2: {visible: true},
    nonnegativeOnly: true
});

Default Value:: false

precision

Precision options for JSXGraph elements. This attributes takes either the value 'inherit' or an object of the form:

precision: {
     touch: 30,
     mouse: 4,
     pen: 4
}

In the first case, the global, JSXGraph-wide values of JXGraph.Options.precision are taken.
Defined in: options.js.

See:: JXG.Options#precision

Default Value:: 'inherit'

{Boolean} priv

A private element will be inaccessible in certain environments, e.g. a graphical user interface.
Defined in: options.js.

Default Value:: false

{Boolean} rotatable

Determines whether two-finger manipulation may rotate this object. If set to false, the object can only be scaled and translated.

In case the element is a polygon or line and it has the attribute "rotatable:false", moving the element with two fingers results in a rotation or translation.

If an element is set to be neither scalable nor rotatable, it can only be translated.

In case of a polygon, scaling is only possible if no vertex has snapToGrid or snapToPoints enabled and no vertex is fixed by some other constraint. Also, the polygon itself has to have snapToGrid disabled.
Defined in: options.js.

See:: JXG.GeometryElement#scalable

Default Value:: true

{Boolean} scalable

Determines whether two-finger manipulation of this object may change its size. If set to false, the object is only rotated and translated.

In case the element is a horizontal or vertical line having ticks, "scalable:true" enables zooming of the board by dragging ticks lines. This feature is enabled, for the ticks element of the line element the attribute "fixed" has to be false and the line element's scalable attribute has to be true.

In case the element is a polygon or line and it has the attribute "scalable:false", moving the element with two fingers results in a rotation or translation.

If an element is set to be neither scalable nor rotatable, it can only be translated.

See:: JXG.Ticks#fixed; JXG.GeometryElement#rotatable

Default Value:: true

{Object} shadow

If enabled:true the (stroke) element will get a customized shadow.

Customize color and opacity: If the object's RGB stroke color is [r,g,b] and its opacity is op, and the shadow parameters color is given as [r', g', b'] and opacity as op' the shadow will receive the RGB color

[blend*r + r', blend*g + g', blend*b + b']and its opacity will be equal to op * op'. Further, the parameters blur and offset can be adjusted. This attribute is only available with SVG, not with canvas. Defined in: options.js.

board.options.line.strokeWidth = 2 // No shadow var li1 = board.create('line', [[-2, 5], [2, 6]], {strokeColor: 'red', shadow: false}); // Default shadow var li2 = board.create('line', [[-2, 3], [2, 4]], {strokeColor: 'red', shadow: true}); // No shadow var li3 = board.create('line', [[-2, 1], [2, 2]], {strokeColor: 'blue', shadow: {enabled: false}}); // Shadow uses same color as line var li4 = board.create('line', [[-2, -1], [2, 0]], {strokeColor: 'blue', shadow: {enabled: true, color: '#000000', blend: 1} }); // Shadow color as a mixture between black and the line color, additionally set opacity var li5 = board.create('line', [[-2, -3], [2, -2]], {strokeColor: 'blue', shadow: {enabled: true, color: '#000000', blend: 0.5, opacity: 0.5} }); // Use different value for blur and offset [dx, dy] var li6 = board.create('line', [[-2, -5], [2, -4]], {strokeColor: 'blue', shadow: {enabled: true, offset:[0, 25], blur: 6} }); Default Value: shadow: { enabled: false, color: [0, 0, 0], opacity: 1, blur: 3, blend: 0.1, offset: [5, 5] } {Boolean} snapToGrid Snaps the element or its parents to the grid. Currently only relevant for points, circles, and lines. Points are snapped to grid directly, on circles and lines it's only the parent points that are snapped Defined in: options.js. Default Value: false {String} strokeColor The stroke color of the given geometry element. Defined in: options.js. See: JXG.GeometryElement#highlightStrokeColor JXG.GeometryElement#strokeWidth JXG.GeometryElement#strokeOpacity JXG.GeometryElement#highlightStrokeOpacity Default Value: JXG.palette.blue {Number} strokeOpacity Opacity for element's stroke color. Defined in: options.js. See: JXG.GeometryElement#strokeColor JXG.GeometryElement#highlightStrokeColor JXG.GeometryElement#strokeWidth JXG.GeometryElement#highlightStrokeOpacity Default Value: 1 {Number} strokeWidth Width of the element's stroke. Defined in: options.js. See: JXG.GeometryElement#strokeColor JXG.GeometryElement#highlightStrokeColor JXG.GeometryElement#strokeOpacity JXG.GeometryElement#highlightStrokeOpacity Default Value: 2 {Number} tabindex Controls if an element can get the focus with the tab key. tabindex corresponds to the HTML attribute of the same name. See description at MDN. The additional value "null" completely disables focus of an element. The value will be ignored if keyboard control of the board is not enabled or the element is fixed or not visible. Defined in: options.js. See: JXG.Board#keyboard JXG.GeometryElement#fixed JXG.GeometryElement#visible Default Value: 0 {Boolean|String} trace If true the element will be traced, i.e. on every movement the element will be copied to the background. Use JXG.GeometryElement#clearTrace to delete the trace elements. The calling of element.setAttribute({trace:false}) additionally deletes all traces of this element. By calling element.setAttribute({trace:'pause'}) the removal of already existing traces can be prevented. The visual appearance of the trace can be influenced by JXG.GeometryElement#traceAttributes. Defined in: options.js. See: JXG.GeometryElement#clearTrace JXG.GeometryElement#traces JXG.GeometryElement#numTraces JXG.GeometryElement#traceAttributes Default Value: false {Object} traceAttributes Extra visual properties for traces of an element Defined in: options.js. JXG.Options.elements.traceAttributes = { size: 2 }; const board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-4, 4, 4, -4], keepaspectratio: true }); var p = board.create('point', [0.0, 2.0], { trace: true, size: 10, traceAttributes: { color: 'black', face: 'x' } }); See: JXG.GeometryElement#trace Default Value: {} {Number} transitionDuration Transition duration (in milliseconds) for certain cahnges of properties like color and opacity. The properties can be set in the attribute transitionProperties Works in SVG renderer, only. Defined in: options.js. See: JXG.GeometryElement#transitionProperties JXG.GeometryElement#strokeColor JXG.GeometryElement#highlightStrokeColor JXG.GeometryElement#strokeOpacity JXG.GeometryElement#highlightStrokeOpacity JXG.GeometryElement#fillColor JXG.GeometryElement#highlightFillColor JXG.GeometryElement#fillOpacity JXG.GeometryElement#highlightFillOpacity Default Value: 100 JXG.Options.elements#transitionDuration {Array} transitionProperties Properties which change smoothly in the time set in transitionDuration. Possible values are ['fill', 'fill-opacity', 'stroke', 'stroke-opacity', 'stroke-width', 'width', 'height', 'rx', 'ry'] (and maybe more) for geometry elements and ['color', 'opacity', 'all'] for HTML texts. Defined in: options.js. var p1 = board.create("point", [0, 2], { name: "A", highlightStrokeWidth: 10, transitionDuration: 1000, transitionProperties: ['width', 'height', 'stroke-width', 'fill', 'fill-opacity', 'rx', 'ry', 'stroke', 'stroke-opacity'] }); See: JXG.GeometryElement#transitionDuration viewport Set individual viewport for an element. If not set to 'inherit', to use the board-wide viewport, an array of the form '[left, top, right, bottom]' has to be given. Defined in: options.js. See: JXG.Board#viewport Default Value: 'inherit' {Boolean} visible If false the element won't be visible on the board, otherwise it is shown. Defined in: options.js. See: JXG.GeometryElement#hideElement JXG.GeometryElement#showElement Default Value: true {Boolean} withLabel If true a label will display the element's name. Using this to suppress labels is more efficient than visible:false. Defined in: options.js. Default Value: false Field Detail <private> <constant> {Number} _org_type Original type of the element at construction time. Used for removing glider property. <private> {Number} _pos The position of this element inside the JXG.Board#objectsList. Default Value: -1 {Object} ancestors Elements on which this element depends on are stored here. <private> {JXG.GeometryElement} baseElement Default Value: null {JXG.Board} board Reference to the board associated with the element. {Object} childElements Stores all dependent objects to be updated when this point is moved. {Object} descendants Elements depending on this element are stored here. {Boolean} dump The element is saved with an explicit entry in the file (true) or implicitly via a composition. Default Value: true <constant> {Number} elementClass The element's class. {String} elType The string used with JXG.Board#create {Boolean} hasLabel If element has a label subelement then this property will be set to true. Default Value: false {Boolean} highlighted True, if the element is currently highlighted. Default Value: false {String} id Unique identifier for the element. Equivalent to id-attribute of renderer element. {Object} inherits Inherits contains the subelements, which may have an attribute (in particular the attribute "visible") having value 'inherit'. {Boolean} isDraggable Controls if this element can be dragged. In GEONExT only free points and gliders can be dragged. Default Value: false {Boolean} isReal If element is in two dimensional real space this is true, else false. Default Value: true {Date} lastDragTime Time stamp containing the last time this element has been dragged. Default Value: creation time {Object} methodMap The methodMap determines which methods can be called from within JessieCode and under which name it can be used. The map is saved in an object, the name of a property is the name of the method used in JessieCode, the value of a property is the name of the method in JavaScript. {Boolean} mouseover Is the mouse over this element? Default Value: false {String} name Not necessarily unique name for the element. See: JXG.Board#generateName Default Value: Name generated by JXG.Board#generateName. {Boolean} needsUpdate Controls if updates are necessary Default Value: true {Object} notExistingParents Stores all Intersection Objects which in this moment are not real and so hide this element. {Number} numTraces Counts the number of objects drawn as part of the trace of the element. See: JXG.GeometryElement#clearTrace JXG.GeometryElement#traces {Object} parents Ids of elements on which this element depends directly are stored here. {Array} quadraticform Quadratic form representation of circles (and conics) Default Value: [[1,0,0],[0,1,0],[0,0,1]] {Object} rendNode Stores the SVG (or VML) rendering node for the element. This enables low-level access to SVG nodes. The properties of such an SVG node can then be changed by calling setAttribute(). Note that there are a few elements which consist of more than one SVG nodes: Elements with arrow tail or head: rendNodeTriangleStart, rendNodeTriangleEnd SVG (or VML) texts: rendNodeText Button: rendNodeForm, rendNodeButton, rendNodeTag Checkbox: rendNodeForm, rendNodeCheckbox, rendNodeLabel, rendNodeTag Input: rendNodeForm, rendNodeInput, rendNodeLabel, rendNodeTag Here is are two examples: The first example shows how to access the SVG node, the second example demonstrates how to change SVG attributes. var p1 = board.create('point', [0, 0]); console.log(p1.rendNode); // returns the full SVG node details of the point p1, something like: // <ellipse id='box_jxgBoard1P6' stroke='#ff0000' stroke-opacity='1' stroke-width='2px' // fill='#ff0000' fill-opacity='1' cx='250' cy='250' rx='4' ry='4' // style='position: absolute;'> // </ellipse> var s = board.create('segment', [p1, p2], {strokeWidth: 60}); s.rendNode.setAttribute('stroke-linecap', 'round'); {Array} stdform [c, b0, b1, a, k, r, q0, q1] See A.E. Middleditch, T.W. Stacey, and S.B. Tor: "Intersection Algorithms for Lines and Circles", ACM Transactions on Graphics, Vol. 8, 1, 1989, pp 25-40. The meaning of the parameters is: Circle: points p=[p0, p1] on the circle fulfill a<p, p> + <b, p> + c = 0 For convenience we also store r: radius k: discriminant = sqrt(<b,b>-4ac) q=[q0, q1] center Points have radius = 0. Lines have radius = infinity. b: normalized vector, representing the direction of the line. Should be put into Coords, when all elements possess Coords. Default Value: [1, 0, 0, 0, 1, 1, 0, 0] {Object} subs Subs contains the subelements, created during the create method. {Object} symbolic Stores variables for symbolic computations {Object} traces Keeps track of all objects drawn as part of the trace of the element. See: JXG.GeometryElement#clearTrace JXG.GeometryElement#numTraces {Array} transformations Stores the transformations which are applied during update in an array See: JXG.Transformation <constant> {Number} type Type of the element. {Object} visProp An associative array containing all visual properties. Default Value: empty object {Object} visPropCalc An associative array containing visual properties which are calculated from the attribute values (i.e. visProp) and from other constraints. An example: if an intersection point does not have real coordinates, visPropCalc.visible is set to false. Additionally, the user can control visibility with the attribute "visible", even by supplying a functions as value. Default Value: empty object Method Detail <private> _set(key, value) Sets the value of attribute key to value. Parameters: {String} key The attribute's name. value The new value addChild(obj) Add an element as a child to the current element. Can be used to model dependencies between geometry elements. Parameters: {JXG.GeometryElement} obj The dependent object. <private> addDescendants(obj) Parameters: {JXG.GeometryElement} obj The element that is to be added to the descendants list. Returns: this <static> JXG.GeometryElement.addEvent() Alias of JXG.EventEmitter.on. {JXG.Object} addParents(parents) Adds ids of elements to the array this.parents. This method needs to be called if some dependencies can not be detected automatically by JSXGraph. For example if a function graph is given by a function which refers to coordinates of a point, calling addParents() is necessary. Parameters: {Array} parents Array of elements or ids of elements. Alternatively, one can give a list of objects as parameters. Returns: {JXG.Object} reference to the object itself. Examples: // Movable function graph var A = board.create('point', [1, 0], {name:'A'}), B = board.create('point', [3, 1], {name:'B'}), f = board.create('functiongraph', function(x) { var ax = A.X(), ay = A.Y(), bx = B.X(), by = B.Y(), a = (by - ay) / ( (bx - ax) * (bx - ax) ); return a * (x - ax) * (x - ax) + ay; }, {fixed: false}); f.addParents([A, B]); <private> {JXG.Object} addParentsFromJCFunctions(function_array) Add dependence on elements in JessieCode functions. Parameters: {Array} function_array Array of functions containing potential properties "deps" with elements the function depends on. Returns: {JXG.Object} reference to the object itself addRotation(angle) Rotate texts or images by a given degree. Parameters: {number} angle The degree of the rotation (90 means vertical text). See: JXG.GeometryElement#rotate {String} addTicks(ticks) Adds ticks to this line or curve. Ticks can be added to a curve or any kind of line: line, arrow, and axis. Parameters: {JXG.Ticks} ticks Reference to a ticks object which is describing the ticks (color, distance, how many, etc.). Returns: {String} Id of the ticks object. {JXG.GeometryElement} addTransform(transform) Add transformations to this element. Parameters: {JXG.Transformation|Array} transform Either one JXG.Transformation or an array of JXG.Transformations. Returns: {JXG.GeometryElement} Reference to the element. {JXG.GeometryElement} animate(hash, time, options) Animates properties for that object like stroke or fill color, opacity and maybe even more later. Parameters: {Object} hash Object containing properties with target values for the animation. {number} time Number of milliseconds to complete the animation. {Object} options Optional Optional settings for the animation:callback: A function that is called as soon as the animation is finished. Returns: {JXG.GeometryElement} A reference to the object {Array, Array} bounds() Dimensions of the smallest rectangle enclosing the element. Returns: {Array} The coordinates of the enclosing rectangle in a format like the bounding box in JXG.Board#setBoundingBox. {Array} similar to JXG.Board#setBoundingBox. clearTrace() Removes all objects generated by the trace function. {JXG.GeometryElement} cloneToBackground() Copy the element to background. This is used for tracing elements. Returns: {JXG.GeometryElement} A reference to the element <private> {number} countChildren() Counts the direct children of an object without counting labels. Returns: {number} Number of children <private> createGradient() Creates a gradient nodes in the renderer. See: JXG.SVGRenderer#setGradient createLabel() Creates a label element for this geometry element. See: #addLabelToElement <private> {boolean} draggable() Decides whether an element can be dragged. This is used in JXG.GeometryElement#setPositionDirectly methods where all parent elements are checked if they may be dragged, too. Returns: {boolean} {String|Number} formatNumberLocale(value, digits) Format a number according to the locale set in the attribute "intl". If in the options of the intl-attribute "maximumFractionDigits" is not set, the optional parameter digits is used instead. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat/NumberFormat for more information about internationalization. Parameters: {Number} value Number to be formatted {Number} digits Optional, Default: undefined Optional number of digits Returns: {String|Number} string containing the formatted number according to the locale or the number itself of the formatting is not possible. <private> {JXG.GeometryElement} fullUpdate(visible) Run through the full update chain of an element. Parameters: {Boolean} visible Set visibility in case the elements attribute value is 'inherit'. null is allowed. Returns: {JXG.GeometryElement} Reference to the element {Array} generatePolynomial() Array of strings containing the polynomials defining the element. Used for determining geometric loci the groebner way. Returns: {Array} An array containing polynomials describing the locus of the current object. getAttribute(key) Get the value of the property key. Parameters: {String} key The name of the property you are looking for Returns: The value of the property {Object} getAttributes() Retrieve a copy of the current visProp. Returns: {Object} {JXG.Coords} getLabelAnchor() Returns the coords object where the label of the element shall be drawn. Differs in some cases from the values that getTextAnchor returns. Returns: {JXG.Coords} JXG.Coords Place where the text shall be drawn. See: JXG.GeometryElement#getTextAnchor {String} getName() Returns the elements name. Used in JessieCode. Returns: {String} {Array} getParents() List of the element ids resp. values used as parents in JXG.Board#create. Returns: {Array} getProperty() Deprecated alias for JXG.GeometryElement#getAttribute. Deprecated: Use JXG.GeometryElement#getAttribute. <private> {Array} getSnapSizes() Determine values of snapSizeX and snapSizeY. If the attributes snapSizex and snapSizeY are greater than zero, these values are taken. Otherwise, determine the distance between major ticks of the default axes. Returns: {Array} containing the snap sizes for x and y direction. {JXG.Coords} getTextAnchor() Returns the coords object where a text that is bound to the element shall be drawn. Differs in some cases from the values that getLabelAnchor returns. Returns: {JXG.Coords} JXG.Coords Place where the text shall be drawn. See: JXG.GeometryElement#getLabelAnchor {String} getType() The type of the element as used in JXG.Board#create. Returns: {String} {JXG.GeometryElement} handleSnapToGrid(force, fromParent) Move an element to its nearest grid point. The function uses the coords object of the element as its actual position. If there is no coords object or if the object is fixed, nothing is done. Parameters: {Boolean} force force snapping independent from what the snaptogrid attribute says {Boolean} fromParent True if the drag comes from a child element. This is the case if a line through two points is dragged. In this case we do not try to force the points to stay inside of the visible board, but the distance between the two points stays constant. Returns: {JXG.GeometryElement} Reference to this element {Boolean} hasPoint(x, y) Checks whether (x,y) is near the element. Parameters: {Number} x Coordinate in x direction, screen coordinates. {Number} y Coordinate in y direction, screen coordinates. Returns: {Boolean} True if (x,y) is near the element, False otherwise. {JXG.GeometryElement} hide() Hide the element. It will still exist but not be visible on the board. Alias for "element.setAttribute({visible: false});" Returns: {JXG.GeometryElement} Reference to the element {JXG.GeometryElement} hideElement() Hide the element. It will still exist but not be visible on the board. Alias for JXG.GeometryElement#hide Returns: {JXG.GeometryElement} Reference to the element {JXG.Board} noHighlight() Uses the "normal" properties of the element. Returns: {JXG.Board} <private> normalize() Normalize the element's standard form. <private> prepareUpdate() Notify all child elements for updates. remove() Removes the element from the construction. This only removes the SVG or VML node of the element and its label (if available) from the renderer, to remove the element completely you should use JXG.Board#removeObject. removeAllTicks() Removes all ticks from a line or curve. {JXG.Object} removeChild(obj) Remove an element as a child from the current element. Parameters: {JXG.GeometryElement} obj The dependent object. Returns: {JXG.Object} reference to the object itself <private> {JXG.Object} removeDescendants(obj) Removes the given object from the descendants list of this object and all its child objects. Parameters: {JXG.GeometryElement} obj The element that is to be removed from the descendants list. Returns: {JXG.Object} reference to the object itself <static> JXG.GeometryElement.removeEvent() Alias of JXG.EventEmitter.off. removeTicks(tick) Removes ticks identified by parameter named tick from this line or curve. Parameters: {JXG.Ticks} tick Reference to tick object to remove. <private> {Object} resolveShortcuts(attributes) Resolves attribute shortcuts like color and expands them, e.g. strokeColor and fillColor. Writes the expanded attributes back to the given attributes. Parameters: {Object} attributes object Returns: {Object} The given attributes object with shortcuts expanded. setArrow(firstArrow, lastArrow) Determines whether the element has arrows at start or end of the arc. If it is set to be a "typical" vector, ie lastArrow == true, then the element.type is set to VECTOR. Parameters: {Boolean} firstArrow True if there is an arrow at the start of the arc, false otherwise. {Boolean} lastArrow True if there is an arrow at the end of the arc, false otherwise. {JXG.GeometryElement} setAttribute(attributes) Sets an arbitrary number of attributes. This method has one or more parameters of the following types: object: {key1:value1,key2:value2,...} string: 'key:value' array: ['key', value] Parameters: {Object} attributes An object with attributes. Returns: {JXG.GeometryElement} A reference to the element. Examples: // Set attribute directly on creation of an element using the attributes object parameter var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-1, 5, 5, 1]}; var p = board.create('point', [2, 2], {visible: false}); // Now make this point visible and fixed: p.setAttribute({ fixed: true, visible: true }); <private> setDash(dash) Set the dash style of an object. See JXG.GeometryElement#dash for a list of available dash styles. You should use JXG.GeometryElement#setAttribute instead of this method. Parameters: {number} dash Indicates the new dash style <private> {JXG.GeometryElement} setDisplayRendNode(val) Show the element or hide it. If hidden, it will still exist but not be visible on the board. Sets also the display of the inherits elements. These can be JSXGraph elements or arrays of JSXGraph elements. However, deeper nesting than this is not supported. Parameters: {Boolean} val true: show the element, false: hide the element Returns: {JXG.GeometryElement} Reference to the element setLabel(str) Sets a label and its text If label doesn't exist, it creates one Parameters: {String} str setLabelText(str) Updates the element's label text, strips all html. Parameters: {String} str setName(str) Updates the element's label text and the element's attribute "name", strips all html. Parameters: {String} str {JXG.Object} setParents(parents) Sets ids of elements to the array this.parents. First, this.parents is cleared. See JXG.GeometryElement#addParents. Parameters: {Array} parents Array of elements or ids of elements. Alternatively, one can give a list of objects as parameters. Returns: {JXG.Object} reference to the object itself. {JXG.GeometryElement} setPosition(method, coords) Translates the object by (x, y). In case the element is defined by points, the defining points are translated, e.g. a circle constructed by a center point and a point on the circle line. Parameters: {Number} method The type of coordinates used here. Possible values are JXG.COORDS_BY_USER and JXG.COORDS_BY_SCREEN. {Array} coords array of translation vector. Returns: {JXG.GeometryElement} Reference to the element object. See: JXG.GeometryElement3D#setPosition2D {JXG.GeometryElement} setPositionDirectly(method, coords, oldcoords) Moves an element by the difference of two coordinates. Parameters: {Number} method The type of coordinates used here. Possible values are JXG.COORDS_BY_USER and JXG.COORDS_BY_SCREEN. {Array} coords coordinates in screen/user units {Array} oldcoords previous coordinates in screen/user units Returns: {JXG.GeometryElement} this element setProperty() Deprecated alias for JXG.GeometryElement#setAttribute. Deprecated: Use JXG.GeometryElement#setAttribute. {JXG.GeometryElement} show() Make the element visible. Alias for "element.setAttribute({visible: true});" Returns: {JXG.GeometryElement} Reference to the element {JXG.GeometryElement} showElement() Make the element visible. Alias for JXG.GeometryElement#show Returns: {JXG.GeometryElement} Reference to the element <private> {JXG.GeometryElement} snapToPoints() Snaps the element to points. Only works for points. Points will snap to the next point as defined in their properties JXG.Point#attractorDistance and JXG.Point#attractorUnit. Lines and circles will snap their parent points to points. Returns: {JXG.GeometryElement} Reference to the element. {JXG.GeometryElement} update() General update method. Should be overwritten by the element itself. Can be used sometimes to commit changes to the object. Returns: {JXG.GeometryElement} Reference to the element <private> {JXG.GeometryElement} updateRenderer() Provide updateRenderer method. Returns: {JXG.GeometryElement} Reference to the element <private> {JXG.GeometryElement} updateVisibility(parent_val) Set the visibility of an element. The visibility is influenced by (listed in ascending priority): The value of the element's attribute 'visible' The visibility of a parent element. (Example: label) This overrules the value of the element's attribute value only if this attribute value of the element is 'inherit'. being inside of the canvas This method is called three times for most elements: between JXG.GeometryElement#update and JXG.GeometryElement#updateRenderer. In case the value is 'inherit', nothing is done. Recursively, called by itself for child elements. Here, 'inherit' is overruled by the parent's value. In JXG.GeometryElement#updateRenderer, if the element is outside of the canvas. Parameters: {Boolean} parent_val Visibility of the parent element. Returns: {JXG.GeometryElement} Reference to the element. {Boolean} useLocale() Checks if locale is enabled in the attribute. This may be in the attributes of the board, or in the attributes of the text. The latter has higher priority. The board attribute is taken if attribute "intl.enabled" of the text element is set to 'inherit'. Returns: {Boolean} if locale can be used for number formatting. Event Detail attribute(o, el) Notify every time an attribute is changed. Parameters: {Object} o A list of changed attributes and their new value. {Object} el Reference to the element attribute:key(val, nval, el) This is a generic event handler. It exists for every possible attribute that can be set for any element, e.g. if you want to be notified everytime an element's strokecolor is changed, is the event attribute:strokecolor. Parameters: val The old value. nval The new value {Object} el Reference to the element down(e) Whenever the user starts to touch or click an element. Parameters: {Event} e The browser's event object. drag(e) This event is fired whenever the user drags an element. Parameters: {Event} e The browser's event object. keydrag(e) This event is fired whenever the user drags the element by pressing arrow keys on the keyboard. Parameters: {Event} e The browser's event object. mousedown(e) Whenever the user starts to click an element. Parameters: {Event} e The browser's event object. mousedrag(e) This event is fired whenever the user drags the element with a mouse. Parameters: {Event} e The browser's event object. mousemove(e) This event is fired whenever the user is moving the mouse over an element. Parameters: {Event} e The browser's event object. mouseout(e) This event is fired whenever the user puts the mouse away from an element. Parameters: {Event} e The browser's event object. mouseover(e) This event is fired whenever the user puts the mouse over an element. Parameters: {Event} e The browser's event object. mouseup(e) Whenever the user releases the mousebutton over an element. Parameters: {Event} e The browser's event object. move(e) This event is fired whenever the user is moving over an element. Parameters: {Event} e The browser's event object. out(e) This event is fired whenever the user is leaving an element. Parameters: {Event} e The browser's event object. over(e) This event is fired whenever the user is hovering over an element. Parameters: {Event} e The browser's event object. pendown(e) Whenever the user taps an element with the pen. Parameters: {Event} e The browser's event object. pendrag(e) This event is fired whenever the user drags the element with a pen. Parameters: {Event} e The browser's event object. penup(e) Whenever the user lifts the pen over an element. Parameters: {Event} e The browser's event object. touchdown(e) Whenever the user starts to touch an element. Parameters: {Event} e The browser's event object. touchdrag(e) This event is fired whenever the user drags the element on a touch device. Parameters: {Event} e The browser's event object. touchup(e) Whenever the user stops touching an element. Parameters: {Event} e The browser's event object. up(e) Whenever the user stops to touch or click an element. Parameters: {Event} e The browser's event object.

JSXGraph 1.10.1 Reference

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Class JXG.GeometryElement