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Class JXG.Circle

JXG.GeometryElement
      ↳ JXG.Circle

Creates a new circle object. Do not use this constructor to create a circle. Use JXG.Board#create with type Circle instead.

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

Class Summary
Constructor Attributes Constructor Name and Description
 
JXG.Circle(board, method, par1, par2, attributes)
A circle consists of all points with a given distance from one point.
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
 
center
The circles center.
 
circle
Circle defining the radius of the circle given by the radius of the other circle only set if method equals 'pointLine'.
 
line
Line defining the radius of the circle given by the distance from the startpoint and the endpoint of the line only set if method equals 'pointLine'.
 
method
Stores the given method.
 
point2
Point on the circle only set if method equals 'twoPoints'.
 
radius
Radius of the circle only set if method equals 'pointRadius'
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 circle.
<private>  
generatePolynomial(p)
Used to generate a polynomial for a point p that lies on this circle.
<private>  
generateRadiusSquared()
Generate symbolic radius calculation for loci determination with Groebner-Basis algorithm.
 
getRadius()
Use JXG.Circle#Radius.
<private>  
hasPoint(x, y)
Checks whether (x,y) is near the circle line or inside of the ellipse (in case JXG.Options.conic#hasInnerPoints is true).
<private>  
maxX()
Returns 1.
<private>  
minX()
Returns 0.
<private>  
notifyParents(contentStr)
Finds dependencies in a given term and resolves them by adding the elements referenced in this string to the circle's list of ancestors.
 
Radius(value)
Calculates the radius of the circle.
 
setPosition(method, coords)
Sets the position of the circle by translating the center and - in case of JXG.Circle#method equals 'twoPoints' - the point on the circle by the amount given in the coords parameter.
 
setPositionDirectly(method, coords, oldcoords)
Sets x and y coordinate and calls the circle's update() method.
 
setRadius(r)
Set a new radius, then update the board.
 
update()
Uses the boards renderer to update the circle.
<private>  
updateQuadraticform()
Updates this circle's JXG.Circle#quadraticform.
<private>  
updateRenderer()
Uses the boards renderer to update the circle.
<private>  
updateStdform()
Updates the stdform derived from the position of the center and the circle's radius.
 
X(t)
Treats the circle as parametric curve and calculates its X coordinate.
 
Y(t)
Treats the circle as parametric curve and calculates its Y coordinate.
 
Z(t)
Treat the circle as parametric curve and calculates its Z coordinate.
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, 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.Circle(board, method, par1, par2, attributes)
A circle consists of all points with a given distance from one point. This point is called center, the distance is called radius. A circle can be constructed by providing a center and a point on the circle or a center and a radius (given as a number, function, line, or circle).
Parameters:
{JXG.Board} board
The board the new circle is drawn on.


{String} method
Can be
  • 'twoPoints' which means the circle is defined by its center and a point on the circle.
  • 'pointRadius' which means the circle is defined by its center and its radius in user units
  • 'pointLine' which means the circle is defined by its center and its radius given by the distance from the startpoint and the endpoint of the line
  • 'pointCircle' which means the circle is defined by its center and its radius given by the radius of another circle
The parameters p1, p2 and radius must be set according to this method parameter.


{JXG.Point} par1
center of the circle.


{JXG.Point|JXG.Line|JXG.Circle} par2
Can be
  • a point on the circle if method is 'twoPoints'
  • a line if the method is 'pointLine'
  • a circle if the method is 'pointCircle'


{Object} attributes


See:
JXG.Board#generateName
Field Detail
{JXG.Point} center
The circles center. Do not set this parameter directly as it will break JSXGraph's update system.
{JXG.Circle} circle
Circle defining the radius of the circle given by the radius of the other circle only set if method equals 'pointLine'. Do not set this parameter directly as it will break JSXGraph's update system.
See:
#method
Default Value:
null
{JXG.Line} line
Line defining the radius of the circle given by the distance from the startpoint and the endpoint of the line only set if method equals 'pointLine'. Do not set this parameter directly as it will break JSXGraph's update system.
See:
#method
Default Value:
null
{string} method
Stores the given method. Can be
See:
#center
#point2
#radius
#line
#circle
{JXG.Point} point2
Point on the circle only set if method equals 'twoPoints'. Do not set this parameter directly as it will break JSXGraph's update system.
See:
#method
{Number} radius
Radius of the circle only set if method equals 'pointRadius'
See:
#method
Default Value:
null
Method Detail
{JXG.Circle} addTransform(transform)
Add transformations to this circle.
Parameters:
{JXG.Transformation|Array} transform
Either one JXG.Transformation or an array of JXG.Transformations.
Returns:
{JXG.Circle} Reference to this circle object.
<private> {Array} generatePolynomial(p)
Used to generate a polynomial for a point p that lies on this circle.
Parameters:
{JXG.Point} p
The point for which the polynomial is generated.
Returns:
{Array} An array containing the generated polynomial.
<private> {String} generateRadiusSquared()
Generate symbolic radius calculation for loci determination with Groebner-Basis algorithm.
Returns:
{String} String containing symbolic calculation of the circle's radius or an empty string if the radius can't be expressed in a polynomial equation.
getRadius()
Use JXG.Circle#Radius.
<private> {Boolean} hasPoint(x, y)
Checks whether (x,y) is near the circle line or inside of the ellipse (in case JXG.Options.conic#hasInnerPoints is true).
Parameters:
{Number} x
Coordinate in x direction, screen coordinates.
{Number} y
Coordinate in y direction, screen coordinates.
Returns:
{Boolean} True if (x,y) is near the circle, False otherwise.
<private> maxX()
Returns 1.
<private> minX()
Returns 0.
<private> notifyParents(contentStr)
Finds dependencies in a given term and resolves them by adding the elements referenced in this string to the circle's list of ancestors.
Parameters:
{String} contentStr
{Number} Radius(value)
Calculates the radius of the circle.
Parameters:
{String|Number|function} value Optional
Set new radius
Returns:
{Number} The radius of the circle
{JXG.Circle} setPosition(method, coords)
Sets the position of the circle by translating the center and - in case of JXG.Circle#method equals 'twoPoints' - the point on the circle by the amount given in the coords parameter.
Parameters:
{Number} method
Either JXG#COORDS_BY_SCREEN or JXG#COORDS_BY_USER.
{Array} coords
Returns:
{JXG.Circle}
{JXG.Circle} setPositionDirectly(method, coords, oldcoords)
Sets x and y coordinate and calls the circle's update() method.
Parameters:
{number} method
The type of coordinates used here. Possible values are JXG.COORDS_BY_USER and JXG.COORDS_BY_SCREEN.
{Array} coords
coordinate in screen/user units
{Array} oldcoords
previous coordinate in screen/user units
Returns:
{JXG.Circle} this element
{JXG.Circle} setRadius(r)
Set a new radius, then update the board.
Parameters:
{String|Number|function} r
A string, function or number describing the new radius.
Returns:
{JXG.Circle} Reference to this circle
update()
Uses the boards renderer to update the circle.
<private> updateQuadraticform()
Updates this circle's JXG.Circle#quadraticform.
<private> updateRenderer()
Uses the boards renderer to update the circle.
<private> updateStdform()
Updates the stdform derived from the position of the center and the circle's radius.
{Number} X(t)
Treats the circle as parametric curve and calculates its X coordinate.
Parameters:
{Number} t
Number between 0 and 1.
Returns:
{Number} X(t)= radius*cos(t)+centerX.
{Number} Y(t)
Treats the circle as parametric curve and calculates its Y coordinate.
Parameters:
{Number} t
Number between 0 and 1.
Returns:
{Number} X(t)= radius*sin(t)+centerY.
{Number} Z(t)
Treat the circle as parametric curve and calculates its Z coordinate.
Parameters:
{Number} t
ignored
Returns:
{Number} 1.0
Documentation generated by JsDoc Toolkit 2.4.0 on Fri Sep 27 2013 11:32:43 GMT+0200 (CEST)