# JSXGraph Reference

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Class Index | File Index

## Elements

## Classes

- _global_
- Angle
- Arc
- Arrow
- Arrowparallel
- Axis
- Bisector
- Bisectorlines
- Button
- Cardinalspline
- Checkbox
- Circle
- Circumcenter
- Circumcircle
- CircumcircleArc
- CircumcircleSector
- Conic
- Curve
- Derivative
- Ellipse
- Functiongraph
- Glider
- Grid
- Group
- Hatch
- Hyperbola
- Image
- Incenter
- Incircle
- Inequality
- Input
- Integral
- Intersection
- JXG
- JXG.AbstractRenderer
- JXG.Board
- JXG.C
- JXG.CA
- JXG.CanvasRenderer
- JXG.Circle
- JXG.Complex
- JXG.Composition
- JXG.Coords
- JXG.CoordsElement
- JXG.Curve
- JXG.Dump
- JXG.EventEmitter
- JXG.GeometryElement
- JXG.GeonextParser
- JXG.Group
- JXG.Image
- JXG.JessieCode
- JXG.JSXGraph
- JXG.Line
- JXG.Math
- JXG.Math.Geometry
- JXG.Math.Numerics
- JXG.Math.Poly
- JXG.Math.Poly.Monomial
- JXG.Math.Poly.Polynomial
- JXG.Math.Poly.Ring
- JXG.Math.Statistics
- JXG.Math.Symbolic
- JXG.NoRenderer
- JXG.Options
- JXG.Point
- JXG.Polygon
- JXG.Server
- JXG.Server.modules
- JXG.SVGRenderer
- JXG.Text
- JXG.Ticks
- JXG.Transformation
- JXG.Turtle
- JXG.Util
- JXG.Util.Base64
- JXG.Util.Unzip
- JXG.Util.UTF8
- JXG.VMLRenderer
- JXG.XML
- Label
- Line
- Locus
- MajorArc
- MajorSector
- Midpoint
- MinorArc
- MinorSector
- Mirrorelement
- Mirrorpoint
- NonReflexAngle
- Normal
- Orthogonalprojection
- OtherIntersection
- Parabola
- Parallel
- Parallelpoint
- Perpendicular
- PerpendicularPoint
- PerpendicularSegment
- Point
- PolarLine
- PolePoint
- Polygon
- Quadtree
- RadicalAxis
- Reflection
- ReflexAngle
- RegularPolygon
- Riemannsum
- Sector
- Segment
- Semicircle
- Slider
- Slopetriangle
- Spline
- Stepfunction
- Tangent
- Tapemeasure
- Text
- Ticks
- Tracecurve
- Transformation
- Turtle

# Class Reflection

JXG.GeometryElement
↳ Reflection

This element is used to construct a reflected point.
Defined in: composition.js.
Extends JXG.GeometryElement.

Class Summary
Constructor Attributes | Constructor Name and Description
--- | ---
| Reflection(p,l) A reflected element (point, line or curve) is given by a given object of the same type and a line of reflection.

Fields borrowed from class JXG.GeometryElement:
  _org_type, _pos, ancestors, baseElement, board, childElements, dash, descendants, draft, dump, elementClass, elType, fillColor, fillOpacity, fixed, frozen, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, inherits, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, notExistingParents, numTraces, parents, quadraticform, rendNode, scalable, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, trace, traceAttributes, traces, transformations, transitionDuration, type, visible, visProp, visPropCalc, withLabel

Fields borrowed from class JXG.GeometryElement:
  _org_type, _pos, ancestors, baseElement, board, childElements, dash, descendants, draft, dump, elementClass, elType, fillColor, fillOpacity, fixed, frozen, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, inherits, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, notExistingParents, numTraces, parents, quadraticform, rendNode, scalable, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, trace, traceAttributes, traces, transformations, transitionDuration, type, visible, visProp, visPropCalc, withLabel

Methods borrowed from class JXG.GeometryElement:
  _set, addChild, addDescendants, addParents, addRotation, addTransform, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getTextAnchor, getType, handleSnapToGrid, hasPoint, hideElement, labelColor, noHighlight, normalize, prepareUpdate, remove, removeChild, removeDescendants, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setPositionDirectly, setProperty, showElement, snapToPoints, update, updateRenderer, updateVisibility

Events borrowed from class JXG.GeometryElement:
  attribute, attribute:<attribute><attribute>, down, drag, mousedown, mousedrag, mousemove, mouseout, mouseover, mouseup, move, out, over, touchdown, touchdrag, touchup, up

Class Detail
Reflection(p,l)
A reflected element (point, line or curve) is given by a given object of the same type and a line of reflection. It is determined by the reflection of the given element across the given line.

Parameters:
{JXG.Point|JXG.Line|JXG.Curve|JXG.Polygon_JXG.Line} p,l
  The reflection element is the reflection of p across the line l.

Throws:
{Error}
  If the element cannot be constructed with the given parent objects an exception is thrown.

Examples:

    var p1 = board.create('point', [0.0, 4.0]);
    var p2 = board.create('point', [6.0, 1.0]);
    var l1 = board.create('line', [p1, p2]);
    var p3 = board.create('point', [3.0, 3.0]);

    var rp1 = board.create('reflection', [p3, l1]);

            // Reflection of more elements
            // reflection line
            var li = board.create('line', [1,1,1], {strokeColor: '#aaaaaa'});
            var reflect = board.create('transform', [li], {type: 'reflect'});

            var p1 = board.create('point', [-3,-1], {name: "A"});
            var q1 = board.create('reflection', [p1, li], {name: "A'"});

            var l1 = board.create('line', [1,-5,1]);
            var l2 = board.create('reflection', [l1, li]);

            var cu1 = board.create('curve', [[-1, -1, -0.5, -1, -1, -0.5], [-3, -2, -2, -2, -2.5, -2.5]]);
            var cu2 = board.create('reflection', [cu1, li], {strokeColor: 'red'});

            var pol1 = board.create('polygon', [[-3,-2], [-1,-4], [-2,-0.5]]);
            var pol2 = board.create('reflection', [pol1, li]);