Usage (signatures)
board.create('vectorfield', [F, xData, yData]);
Parameters
| Name | Type | Description |
|---|---|---|
F |
Array | function | String | Either an array containing two functions |
xData |
Array | Array of length 3 containing start value for |
yData |
Array | Array of length 3 containing start value for |
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
}
});
Attributes
Own
arrowhead
- Description
Customize arrow heads of vectors. Be careful! If enabled this will slow down the performance. Fields are:
- enabled: Boolean
- size: length of the arrow head legs (in pixel)
- angle: angle of the arrow head legs In radians.
- Type
- Object
- Default Value
- {enabled: true, size: 5, angle: Math.PI * 0.125}
- Source
- options.js, line 10933
scale
- Description
Scaling factor of the vectors. This in contrast to slope fields, where this attribute sets the vector to the given length.
- Type
- Number | function
- Default Value
- 1
- See
- Source
- options.js, line 10920
Inherited
Members
Own
none
Inherited
Methods
Own
(static) setF(func) → {Object}
Set the defining functions of vector field.
Example
field.setF([(x, y) => Math.sin(y), (x, y) => Math.cos(x)]);
board.update();Parameters
| Name | Type | Description |
|---|---|---|
func |
Array | function | 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
Reference to the vector field object.
- Type
- Object
Details
- Source
- element/vectorfield.js, line 177
Inherited
Events
Own
none
Inherited
Throws
-
If the element cannot be constructed with the given parent objects an exception is thrown.
- Type
- Error
Details
- Type
- JXG.Curve
- Source
- element/vectorfield.js, line 39