JSXGraph Reference
ElementsElement Point
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.
| Constructor Attributes | Constructor Name and Description |
|---|---|
- Methods borrowed from class JXG.Point:
- _anim, addConstraint, addTransform, Dist, free, handleAttractors, handleSnapToGrid, handleSnapToPoints, hasPoint, makeGlider, moveAlong, moveTo, normalizeFace, popSlideObject, remove, setGliderPosition, setPosition, setPositionByTransform, setPositionDirectly, setStyle, update, updateConstraint, updateGlider, updateGliderFromParent, updateRenderer, updateTransform, visit, X, XEval, Y, YEval, Z, ZEval
- Methods borrowed from class JXG.GeometryElement:
- _set, addChild, addDescendants, addRotation, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getTextAnchor, getType, hideElement, labelColor, noHighlight, normalize, off, on, prepareUpdate, removeChild, removeDescendants, resolveShortcuts, setArrow, setAttribute, setDash, setLabelText, showElement, triggerEventHandlers
- 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
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.
-
{JXG.Point} Point
{JXG.Transformation} Transformation
- A point can also be created providing a transformation. 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.
- 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]);
Attributes borrowed from other Elements
- Attributes borrowed from class JXG.Point:
- attractorDistance, attractors, face, showInfobox, size, snapToPoints, snatchDistance, style
- Attributes borrowed from class JXG.GeometryElement:
- dash, draft, fillColor, fillOpacity, fixed, frozen, highlight, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, needsRegularUpdate, scalable, shadow, strokeColor, strokeOpacity, strokeWidth, trace, traceAttributes, visible, withLabel
Fields borrowed from other Elements
- Fields borrowed from class JXG.Point:
- coords, group, needsUpdateFromParent, onPolygon, position, slideObjects, snapSizeX, snapSizeY, snapToGrid
- 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.Point:
- _anim, addConstraint, addTransform, Dist, free, handleAttractors, handleSnapToGrid, handleSnapToPoints, hasPoint, makeGlider, moveAlong, moveTo, normalizeFace, popSlideObject, remove, setGliderPosition, setPosition, setPositionByTransform, setPositionDirectly, setStyle, update, updateConstraint, updateGlider, updateGliderFromParent, updateRenderer, updateTransform, visit, X, XEval, Y, YEval, Z, ZEval
- Methods borrowed from class JXG.GeometryElement:
- _set, addChild, addDescendants, addRotation, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getTextAnchor, getType, hideElement, labelColor, noHighlight, normalize, off, on, prepareUpdate, removeChild, removeDescendants, resolveShortcuts, setArrow, setAttribute, setDash, setLabelText, showElement, triggerEventHandlers
Events borrowed from other Elements