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Class JXG.Curve

JXG.GeometryElement
      ↳ JXG.Curve

Creates a new curve object. Do not use this constructor to create a curve. Use JXG.Board#create with type Curve, or Functiongraph instead.

Defined in: curve.js.
Extends JXG.GeometryElement.

Class Summary
Constructor Attributes Constructor Name and Description
 
JXG.Curve(board, parents, attributes)
Curves are the common object for function graphs, parametric curves, polar curves, and data plots.
Attributes Summary
Field Attributes Field Name and Description
 
curveType
The curveType is set in @see generateTerm and used in JXG.Curve#updateCurve.
 
handDrawing
The data points of the curve are not connected with straight lines but with bezier curves.
Fields borrowed from class JXG.GeometryElement:
_pos, addEvent, ancestors, baseElement, board, childElements, dash, descendants, draft, dump, elementClass, elType, eventHandlers, fillColor, fillOpacity, fixed, frozen, getProperty, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, notExistingParents, numTraces, quadraticform, removeEvent, rendNode, scalable, setProperty, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, trace, traceAttributes, traces, transformations, type, visible, visProp, withLabel
Field Summary
Field Attributes Field Name and Description
 
numberPoints
Number of points on curves.
Fields borrowed from class JXG.GeometryElement:
_pos, addEvent, ancestors, baseElement, board, childElements, dash, descendants, draft, dump, elementClass, elType, eventHandlers, fillColor, fillOpacity, fixed, frozen, getProperty, hasLabel, highlight, highlighted, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, id, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsRegularUpdate, needsUpdate, notExistingParents, numTraces, quadraticform, removeEvent, rendNode, scalable, setProperty, shadow, snapToGrid, stdform, strokeColor, strokeOpacity, strokeWidth, subs, symbolic, trace, traceAttributes, traces, transformations, type, visible, visProp, withLabel
Method Summary
Method Attributes Method Name and Description
 
addTransform(transform)
Add transformations to this curve.
 
allocatePoints()
Allocate points in the Coords array this.points
 
checkReal()
Check if at least one point on the curve is finite and real.
 
generateTerm(varname, xterm, yterm, mi, ma)
Converts the GEONExT syntax of the defining function term into JavaScript.
 
hasPoint(x, y, start)
Checks whether (x,y) is near the curve.
<private>  
interpolationFunctionFromArray(which)
Generate the method curve.X() in case curve.dataX is an array and generate the method curve.Y() in case curve.dataY is an array.
 
isDistOK(dx, dy, MAXX, MAXY)
Compares the absolute value of dx with MAXX and the absolute value of dy with MAXY.
 
isSegmentOutside(x0, y0, x1, y1)
Crude and cheap test if the segment defined by the two points (x0, y0) and (x1, y1) is outside the viewport of the board.
 
maxX()
Gives the default value of the right bound for the curve.
 
minX()
Gives the default value of the left bound for the curve.
 
notifyParents(contentStr)
Finds dependencies in a given term and notifies the parents by adding the dependent object to the found objects child elements.
 
setPosition(method, coords)
Translates the object by (x, y).
 
setPositionDirectly(method, coords, oldcoords)
Moves the cuvre by the difference of two coordinates.
 
update()
Computes for equidistant points on the x-axis the values of the function
 
updateCurve()
Computes for equidistant points on the x-axis the values of the function.
 
updateDataArray()
For dynamic dataplots updateCurve can be used to compute new entries for the arrays JXG.Curve#dataX and JXG.Curve#dataY.
 
updateParametricCurve(mi, ma)
Updates the data points of a parametric curve.
 
updateParametricCurveNaive(mi, ma, len)
Updates the data points of a parametric curve.
 
updateRenderer()
Updates the visual contents of the curve.
 
updateTransform(p)
Applies the transformations of the curve to the given point p.
 
Z(t)
Treat the curve as curve with homogeneous coordinates.
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, remove, 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
Class Detail
JXG.Curve(board, parents, attributes)
Curves are the common object for function graphs, parametric curves, polar curves, and data plots.
Parameters:
{String|JXG.Board} board
The board the new curve is drawn on.


{Array} parents
defining terms An array with the functon terms or the data points of the curve.


{Object} attributes
Defines the visual appearance of the curve.


See:
JXG.Board#generateName
JXG.Board#addCurve
Attribute Detail
curveType
The curveType is set in @see generateTerm and used in JXG.Curve#updateCurve. Possible values are Only parameter and plot are set directly. Polar is set with JXG.GeometryElement#setAttribute only.
Defined in: options.js.
{Boolean} handDrawing
The data points of the curve are not connected with straight lines but with bezier curves.
Defined in: options.js.
Default Value:
false
Field Detail
numberPoints
Number of points on curves. This value changes between numberPointsLow and numberPointsHigh. It is set in JXG.Curve#updateCurve.
Method Detail
{JXG.Curve} addTransform(transform)
Add transformations to this curve.
Parameters:
{JXG.Transformation|Array} transform
Either one JXG.Transformation or an array of JXG.Transformations.
Returns:
{JXG.Curve} Reference to the curve object.
allocatePoints()
Allocate points in the Coords array this.points
checkReal()
Check if at least one point on the curve is finite and real.
generateTerm(varname, xterm, yterm, mi, ma)
Converts the GEONExT syntax of the defining function term into JavaScript. New methods X() and Y() for the Curve object are generated, further new methods for minX() and maxX().
Parameters:
varname
xterm
yterm
mi
ma
See:
JXG.GeonextParser.geonext2JS.
{Boolean} hasPoint(x, y, start)
Checks whether (x,y) is near the curve.
Parameters:
{Number} x
Coordinate in x direction, screen coordinates.
{Number} y
Coordinate in y direction, screen coordinates.
{Number} start
Optional start index for search on data plots.
Returns:
{Boolean} True if (x,y) is near the curve, False otherwise.
<private> {function} interpolationFunctionFromArray(which)
Generate the method curve.X() in case curve.dataX is an array and generate the method curve.Y() in case curve.dataY is an array.
Parameters:
{String} which
Either 'X' or 'Y'
Returns:
{function}
{Boolean} isDistOK(dx, dy, MAXX, MAXY)
Compares the absolute value of dx with MAXX and the absolute value of dy with MAXY.
Parameters:
{Number} dx
{Number} dy
{Number} MAXX
{Number} MAXY
Returns:
{Boolean} true, if |dx| < MAXX and |dy| < MAXY.
{Boolean} isSegmentOutside(x0, y0, x1, y1)
Crude and cheap test if the segment defined by the two points (x0, y0) and (x1, y1) is outside the viewport of the board. All parameters have to be given in screen coordinates.
Parameters:
{Number} x0
{Number} y0
{Number} x1
{Number} y1
Returns:
{Boolean} true if the given segment is outside the visible area.
{Number} maxX()
Gives the default value of the right bound for the curve. May be overwritten in JXG.Curve#generateTerm.
Returns:
{Number} Right bound for the curve.
{Number} minX()
Gives the default value of the left bound for the curve. May be overwritten in JXG.Curve#generateTerm.
Returns:
{Number} Left bound for the curve.
notifyParents(contentStr)
Finds dependencies in a given term and notifies the parents by adding the dependent object to the found objects child elements.
Parameters:
{String} contentStr
String containing dependencies for the given object.
{JXG.Curve} setPosition(method, coords)
Translates the object by (x, y).
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.Curve} Reference to the curve object.
{JXG.Curve} setPositionDirectly(method, coords, oldcoords)
Moves the cuvre 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.Curve} this element
{JXG.Curve} update()
Computes for equidistant points on the x-axis the values of the function
Returns:
{JXG.Curve} Reference to the curve object.
See:
JXG.Curve#updateCurve
{JXG.Curve} updateCurve()
Computes for equidistant points on the x-axis the values of the function. If the mousemove event triggers this update, we use only few points. Otherwise, e.g. on mouseup, many points are used.
Returns:
{JXG.Curve} Reference to the curve object.
See:
JXG.Curve#update
updateDataArray()
For dynamic dataplots updateCurve can be used to compute new entries for the arrays JXG.Curve#dataX and JXG.Curve#dataY. It is used in JXG.Curve#updateCurve. Default is an empty method, can be overwritten by the user.
{JXG.Curve} updateParametricCurve(mi, ma)
Updates the data points of a parametric curve. This version is used if JXG.Curve#doadvancedplot is true.
Parameters:
{Number} mi
Left bound of curve
{Number} ma
Right bound of curve
Returns:
{JXG.Curve} Reference to the curve object.
{JXG.Curve} updateParametricCurveNaive(mi, ma, len)
Updates the data points of a parametric curve. This version is used if JXG.Curve#doadvancedplot is false.
Parameters:
{Number} mi
Left bound of curve
{Number} ma
Right bound of curve
{Number} len
Number of data points
Returns:
{JXG.Curve} Reference to the curve object.
{JXG.Curve} updateRenderer()
Updates the visual contents of the curve.
Returns:
{JXG.Curve} Reference to the curve object.
{JXG.Point} updateTransform(p)
Applies the transformations of the curve to the given point p. Before using it, JXG.Curve#updateTransformMatrix has to be called.
Parameters:
{JXG.Point} p
Returns:
{JXG.Point} The given point.
{Number} Z(t)
Treat the curve as curve with homogeneous coordinates.
Parameters:
{Number} t
A number between 0.0 and 1.0.
Returns:
{Number} Always 1.0
Documentation generated by JsDoc Toolkit 2.4.0 on Fri Sep 27 2013 11:32:43 GMT+0200 (CEST)