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Elements
Classes

Element Vectorfield

JXG.GeometryElement
   ↳ JXG.Curve
         ↳ Vectorfield

Vector field.

Plot a vector field either given by two functions f1(x, y) and f2(x,y) or by a function f(x, y) returning an array of size 2.

Defined in: vectorfield.js.
Extends JXG.Curve.

Element Summary
Constructor Attributes Constructor Name and Description
 
Vectorfield
Attributes Summary
Field Attributes Field Name and Description
 
arrowhead
Customize arrow heads of vectors.
 
scale
Scaling factor of the vectors.
Method Summary
Method Attributes Method Name and Description
<static>  
Vectorfield.setF(func)
Set the defining functions of vector field.
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
Vectorfield
This element has no direct constructor. To create an instance of this element you have to call JXG.Board#create with type "vectorfield".

Possible parent array combinations are:
{Array|Function|String} F

Either an array containing two functions f1(x, y) and f2(x, y) or function f(x, y) returning an array of length 2.


{Array} xData

Array of length 3 containing start value for x, number of steps, end value of x. The vector field will contain (number of steps) + 1 vectors in direction of x.


{Array} yData

Array of length 3 containing start value for y, number of steps, end value of y. The vector field will contain (number of steps) + 1 vectors in direction of y.


Throws:
{Error}
If the element cannot be constructed with the given parent objects an exception is thrown. Parameter options:
Examples:
// Defining functions
var fx = (x, y) => Math.sin(y);
var fy = (x, y) => Math.cos(x);

var field = board.create('vectorfield', [
        [fx, fy],    // Defining function
        [-6, 25, 6], // Horizontal mesh
        [-5, 20, 5], // Vertical mesh
    ]);



				
				
// Slider to control length of vectors
var s = board.create('slider', [[-3, 7], [3, 7], [0, 0.33, 1]], {name: 'length'});
// Slider to control number of steps
var stepsize = board.create('slider', [[-3, 6], [3, 6], [1, 20, 100]], {name: 'steps', snapWidth: 1});

// Defining functions
var fx = (x, y) => 0.2 * y;
var fy = (x, y) => 0.2 * (Math.cos(x) - 2) * Math.sin(x);

var field = board.create('vectorfield', [
        [fx, fy],        // Defining function
        [-6, () => stepsize.Value(), 6], // Horizontal mesh
        [-5, () => stepsize.Value(), 5], // Vertical mesh
    ], {
        highlightStrokeColor: JXG.palette.blue, // Make highlighting invisible

        scale: () => s.Value(), // Scaling of vectors

        arrowHead: {
            enabled: true,
            size: 8,  // Pixel length of arrow head
            angle: Math.PI / 16
        }
});





				
                

				


			

			


			
				

    				 Attribute Detail
				

				
					 
					


					
					arrowhead

					

					

						Customize arrow heads of vectors. Be careful! If enabled this will slow down the performance.
Fields are:

						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
						
							

							
Default Value:

							

								{enabled: true, size: 5, angle: Math.PI * 0.125}
							

							

						

					

				
					 
					


					
					scale

					

					

						Scaling factor of the vectors. This in contrast to slope fields, where this attribute sets the vector to the given length.
						
							

							Defined in:  options.js.
						
						
					


					

						
						
						
							

							
See:

							
							
Slopefield.scale

							
							

						
						
							

							
Default Value:

							

								1
							

							

						

					
				
			


			


			
				

					Method Detail
				

				
					 
					
<static> 

					{Object}
					Vectorfield.setF(func)

					

					

						Set the defining functions of vector field.
						
						
					


						
							

							
Parameters:

							
								

									{Array|Function} func
									
								

								
Either an array containing two functions f1(x, y) and f2(x, y) or function f(x, y) returning an array of length 2.

							
							

						
						
						
						
						
							

							
Returns:

							
								
{Object} Reference to the vector field object.

							
							

						
						
						

					
					

					
Examples:

					
					
field.setF([(x, y) => Math.sin(y), (x, y) => Math.cos(x)]);
board.update();

					
					

					

					
				
			


			

			


			
                
                

                    Attributes borrowed from other Elements
                


                

                
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 12:13:08 GMT+0100 (Mitteleuropäische Normalzeit)