Class 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 |
---|---|
PolarLine(el1,el2, el1,el2)
The polar line is the unique reciprocal relationship of a point with respect to a conic.
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- Fields borrowed from class JXG.Line:
- defaultTicks, parentPolygon, point1, point2, ticks
- Fields borrowed from class JXG.GeometryElement:
- _org_type, _pos, ancestors, baseElement, board, childElements, dash, descendants, draft, dragToTopOfLayer, dump, elementClass, elType, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, inherits, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, notExistingParents, numTraces, parents, precision, quadraticform, rendNode, rotatable, scalable, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, tabindex, trace, traceAttributes, traces, transformations, transitionDuration, transitionProperties, type, visible, visProp, visPropCalc, withLabel
- Fields borrowed from class JXG.Line:
- defaultTicks, parentPolygon, point1, point2, ticks
- Fields borrowed from class JXG.GeometryElement:
- _org_type, _pos, ancestors, baseElement, board, childElements, dash, descendants, draft, dragToTopOfLayer, dump, elementClass, elType, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, inherits, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, notExistingParents, numTraces, parents, precision, quadraticform, rendNode, rotatable, scalable, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, tabindex, trace, traceAttributes, traces, transformations, transitionDuration, transitionProperties, type, visible, visProp, visPropCalc, withLabel
- Methods borrowed from class JXG.Line:
- addTransform, generatePolynomial, getAngle, getRise, getSlope, hasPoint, L, maxX, minX, setLabelRelativeCoords, setStraight, updateRenderer, updateSegmentFixedLength, updateStdform, X, Y, Z
- Methods borrowed from class JXG.GeometryElement:
- _set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, fullUpdate, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hide, hideElement, labelColor, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setPositionDirectly, setProperty, show, showElement, snapToPoints, update, updateVisibility
- 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
Class Detail
PolarLine(el1,el2, el1,el2)
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 https://en.wikipedia.org/wiki/Pole_and_polar for more information on pole and polar.
- Parameters:
- {JXG.Conic|JXG.Circle_JXG.Point} el1,el2
- or
- {JXG.Point_JXG.Conic|JXG.Circle} el1,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]);