JSXGraph Reference
ElementsElement PolarLine
JXG.GeometryElement
↳ JXG.Line
↳ PolarLine
This element is used to provide a constructor for the polar line of a point with respect to a conic or a circle.
Defined in: line.js.
Extends
JXG.Line.
| Constructor Attributes | Constructor Name and Description |
|---|---|
|
The polar line is the unique reciprocal relationship of a point with respect to a conic.
|
- Methods borrowed from class JXG.Line:
- addTicks, addTransform, generatePolynomial, getAngle, getRise, getSlope, hasPoint, L, maxX, minX, removeAllTicks, removeTicks, setLabelRelativeCoords, setPosition, setPositionDirectly, setStraight, updateRenderer, updateSegmentFixedLength, updateStdform, X, Y, Z
- Methods borrowed from class JXG.GeometryElement:
- _set, addChild, addDescendants, addRotation, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getTextAnchor, getType, handleSnapToGrid, hideElement, labelColor, noHighlight, normalize, off, on, prepareUpdate, remove, removeChild, removeDescendants, resolveShortcuts, setArrow, setAttribute, setDash, setLabelText, setName, showElement, snapToPoints, triggerEventHandlers, update
- 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
Element Detail
PolarLine
The polar line is the unique reciprocal relationship of a point with respect to a conic.
The lines through the intersections of a conic and the polar line of a point with respect to that conic and through that point are tangent to the conic.
A point on a conic has the polar line of that point with respect to that conic as the tangent line to that conic at that point.
See http://en.wikipedia.org/wiki/Pole_and_polar for more information on pole and polar.
-
This element has no direct constructor. To create an instance of this element you have to call JXG.Board#create
with type "polarline".
- Possible parent array combinations are:
-
{JXG.Conic|JXG.Circle} el1
{JXG.Point} el2
- or
-
{JXG.Point} el1
{JXG.Conic|JXG.Circle} el2
- The result will be the polar line of the point with respect to the conic or the circle.
- Throws:
- {Exception}
- If the element cannot be constructed with the given parent objects an exception is thrown.
- Examples:
// Create the polar line of a point with respect to a conic
var p1 = board.create('point', [-1, 2]);
var p2 = board.create('point', [ 1, 4]);
var p3 = board.create('point', [-1,-2]);
var p4 = board.create('point', [ 0, 0]);
var p5 = board.create('point', [ 4,-2]);
var c1 = board.create('conic',[p1,p2,p3,p4,p5]);
var p6 = board.create('point', [-1, 1]);
var l1 = board.create('polarline', [c1, p6]);
// Create the polar line of a point with respect to a circle.
var p1 = board.create('point', [ 1, 1]);
var p2 = board.create('point', [ 2, 3]);
var c1 = board.create('circle',[p1,p2]);
var p3 = board.create('point', [ 6, 6]);
var l1 = board.create('polarline', [c1, p3]);
Attributes borrowed from other Elements
- Attributes borrowed from class JXG.GeometryElement:
- dash, draft, fillColor, fillOpacity, fixed, frozen, highlight, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, needsRegularUpdate, scalable, shadow, snapToGrid, strokeColor, strokeOpacity, strokeWidth, trace, traceAttributes, visible, withLabel
Fields borrowed from other Elements
- Fields borrowed from class JXG.Line:
- defaultTicks, parentPolygon, point1, point2, ticks
- Fields borrowed from class JXG.GeometryElement:
- _pos, addEvent, ancestors, baseElement, board, childElements, descendants, dump, elementClass, elType, eventHandlers, getProperty, hasLabel, highlighted, id, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsUpdate, notExistingParents, numTraces, quadraticform, removeEvent, rendNode, setProperty, stdform, subs, symbolic, traces, transformations, type, visProp
Methods borrowed from other Elements
- Methods borrowed from class JXG.Line:
- addTicks, addTransform, generatePolynomial, getAngle, getRise, getSlope, hasPoint, L, maxX, minX, removeAllTicks, removeTicks, setLabelRelativeCoords, setPosition, setPositionDirectly, setStraight, updateRenderer, updateSegmentFixedLength, updateStdform, X, Y, Z
- Methods borrowed from class JXG.GeometryElement:
- _set, addChild, addDescendants, addRotation, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getTextAnchor, getType, handleSnapToGrid, hideElement, labelColor, noHighlight, normalize, off, on, prepareUpdate, remove, removeChild, removeDescendants, resolveShortcuts, setArrow, setAttribute, setDash, setLabelText, setName, showElement, snapToPoints, triggerEventHandlers, update
Events borrowed from other Elements