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Elements
Classes

Element Arc

JXG.GeometryElement
   ↳ JXG.Curve
      ↳ Curve
            ↳ Arc

An arc is a segment of the circumference of a circle. It is defined by a center, one point that defines the radius, and a third point that defines the angle of the arc.

Defined in: arc.js.
Extends Curve.

Element Summary
Constructor Attributes Constructor Name and Description
 
Arc
Attributes Summary
Field Attributes Field Name and Description
 
anglePoint
Attributes for angle point.
 
center
Attributes for center point.
 
hasInnerPoints
If true, moving the mouse over inner points triggers hasPoint.
 
radiusPoint
Attributes for radius point.
 
selection
Type of arc.
<private>  
useDirection
If true, there is a fourth parent point, i.e.
Field Summary
Field Attributes Field Name and Description
 
anglepoint
The point defining the arc's angle.
 
L
Arc length.
 
radiuspoint
Point defining the arc's radius.
Method Summary
Method Attributes Method Name and Description
<deprecated>  
getRadius()
 
hasPointSector(x, y)
Checks whether (x,y) is within the sector defined by the arc.
 
Radius()
Determines the arc's current radius.
 
Value(unit, rad)
Returns the length of the arc or the value of the angle spanned by the arc.
Methods borrowed from class JXG.Curve:
addTransform, allocatePoints, generateTerm, getTransformationSource, hasPoint, interpolationFunctionFromArray, maxX, minX, moveTo, notifyParents, update, updateCurve, updateDataArray, updateRenderer, updateTransform, X, Y, Z
Methods borrowed from class JXG.GeometryElement:
_set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, eval, evalVisProp, formatNumberLocale, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hide, hideElement, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setPositionDirectly, setProperty, show, showElement, snapToPoints, updateVisibility, useLocale
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
Element Detail
Arc
This element has no direct constructor. To create an instance of this element you have to call JXG.Board#create with type "arc".

Possible parent array combinations are:
{JXG.Point} p1
{JXG.Point} p2
{JXG.Point} p3

The result will be an arc of a circle around p1 through p2. The arc is drawn counter-clockwise from p2 to p3.


Throws:
{Error}
If the element cannot be constructed with the given parent objects an exception is thrown.
Examples:
// Create an arc out of three free points
var p1 = board.create('point', [2.0, 2.0]);
var p2 = board.create('point', [1.0, 0.5]);
var p3 = board.create('point', [3.5, 1.0]);

var a = board.create('arc', [p1, p2, p3]);
board.create('text',[1,6,function(){return 'arclength: '+Math.round(a.Value()*100)/100}])


				
				
var t = board.create('transform', [2, 1.5], {type: 'scale'});
var a1 = board.create('arc', [[1, 1], [0, 1], [1, 0]], {strokeColor: 'red'});
var a2 = board.create('curve', [a1, t], {strokeColor: 'red'});





				
                

				


			

			


			
				

    				 Attribute Detail
				

				
					 
					


					{Point}
					anglePoint

					

					

						Attributes for angle point.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						

					

				
					 
					


					{Point}
					center

					

					

						Attributes for center point.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						

					

				
					 
					


					{Boolean}
					hasInnerPoints

					

					

						If true, moving the mouse over inner points triggers hasPoint.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
JXG.GeometryElement#hasPoint

							
							

						
						
							

							
Default Value:

							

								false
							

							

						

					

				
					 
					


					{Point}
					radiusPoint

					

					

						Attributes for radius point.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						

					

				
					 
					


					{String}
					selection

					

					

						Type of arc. Possible values are 'minor', 'major', and 'auto'.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						
							

							
Default Value:

							

								'auto'
							

							

						

					

				
					 
					
<private> 

					{Boolean}
					useDirection

					

					

						If true, there is a fourth parent point, i.e. the parents are [center, p1, p2, p3].
p1 is still the radius point, p2 the angle point. The arc will be that part of the
the circle with center 'center' which starts at p1, ends at the ray between center
and p2, and passes p3.


This attribute is immutable (by purpose).
This attribute is necessary for circumCircleArcs
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						
							

							
Default Value:

							

								false
							

							

						

					
				
			


			
				

                     Field Detail
				

				
					 
					


					{JXG.Point}
					anglepoint

					

					

						The point defining the arc's angle.
						
						
					


					

						
						
						
						

					

				
					 
					


					{Number}
					L

					

					

						Arc length.
						
						
					


					

						
						
						
							

							
See:

							
							
Arc#Value

							
							

						
						

					

				
					 
					


					{JXG.Point}
					radiuspoint

					

					

						Point defining the arc's radius.
						
						
					


					

						
						
						
						

					
				
			


			
				

					Method Detail
				

				
					 
					


					{Number}
					getRadius()

					

					

						
						
						
					


						
						
							

							
Deprecated:

							

								Use Arc#Radius
							

							

						
						
						
						
							

							
Returns:

							
								
{Number} 

							
							

						
						
						

					

					

				
					 
					


					{Boolean}
					hasPointSector(x, y)

					

					

						Checks whether (x,y) is within the sector defined by the arc.
						
						
					


						
							

							
Parameters:

							
								

									{Number} x
									
								

								
Coordinate in x direction, screen coordinates.

							
								

									{Number} y
									
								

								
Coordinate in y direction, screen coordinates.

							
							

						
						
						
						
						
							

							
Returns:

							
								
{Boolean} True if (x,y) is within the sector defined by the arc, False otherwise.

							
							

						
						
						

					

					

				
					 
					


					{Number}
					Radius()

					

					

						Determines the arc's current radius. I.e. the distance between Arc#center and Arc#radiuspoint.
						
						
					


						
						
						
						
						
							

							
Returns:

							
								
{Number} The arc's radius

							
							

						
						
						

					

					

				
					 
					


					{Number}
					Value(unit, rad)

					

					

						Returns the length of the arc or the value of the angle spanned by the arc.
						
						
					


						
							

							
Parameters:

							
								

									{String} unit
									Optional, Default: 'length'
								

								
Unit of the returned values. Possible units are

    

  •  'length' (default): length of the arc line

  •  'radians': angle spanned by the arc in radians

  •  'degrees': angle spanned by the arc in degrees

  •  'semicircle': angle spanned by the arc in radians as a multiple of π, e.g. if the angle is 1.5π, 1.5 will be returned.

  •  'circle': angle spanned by the arc in radians as a multiple of 2π


It is sufficient to supply the first three characters of the unit, e.g. 'len'.

							
								

									{Number} rad
									Optional, Default: undefined
								

								
Value of angle which can be used instead of the generic one.

							
							

						
						
						
						
						
							

							
Returns:

							
								
{Number} The arc length or the angle value in various units.

							
							

						
						
						

					

					
				
			


			

			


			
                
                

                    Attributes borrowed from other Elements
                


                

                
Attributes borrowed from class Curve: 
curveType, doAdvancedPlot, doAdvancedPlotOld, firstArrow, handDrawing, label, lastArrow, numberPointsHigh, numberPointsLow, plotVersion, recursionDepthHigh, recursionDepthLow
Attributes borrowed from class JXG.Curve: 
lineCap
Attributes borrowed from class JXG.GeometryElement: 
aria, cssClass, dash, dashScale, draft, dragToTopOfLayer, element3D, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, highlight, highlightCssClass, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, isLabel, layer, needsRegularUpdate, nonnegativeOnly, precision, priv, rotatable, scalable, shadow, snapToGrid, strokeColor, strokeOpacity, strokeWidth, tabindex, trace, traceAttributes, transitionDuration, transitionProperties, visible, withLabel

                

                

                


				
				

					Fields borrowed from other Elements
				


				

				
Fields borrowed from class JXG.Curve: 
dataX, dataY, numberPoints, qdt, ticks
Fields borrowed from class JXG.GeometryElement: 
_org_type, _pos, ancestors, baseElement, board, childElements, descendants, dump, elementClass, elType, hasLabel, highlighted, id, inherits, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsUpdate, notExistingParents, numTraces, parents, quadraticform, rendNode, stdform, subs, symbolic, traces, transformations, type, visProp, visPropCalc

				

				

				

				
				

					Methods borrowed from other Elements
				

				

				
Methods borrowed from class JXG.Curve: 
addTransform, allocatePoints, generateTerm, getTransformationSource, hasPoint, interpolationFunctionFromArray, maxX, minX, moveTo, notifyParents, update, updateCurve, updateDataArray, updateRenderer, updateTransform, X, Y, Z
Methods borrowed from class JXG.GeometryElement: 
_set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, eval, evalVisProp, formatNumberLocale, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hide, hideElement, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setPositionDirectly, setProperty, show, showElement, snapToPoints, updateVisibility, useLocale

				

				

                

                
   				

    				Events borrowed from other Elements
                

                

                
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

                

                

            

		




		

			
			Documentation generated by JsDoc Toolkit 2.4.0 on Fri Nov 08 2024 12:13:02 GMT+0100 (Mitteleuropäische Normalzeit)