MetapostSpline - Documentation

Usage (signatures)

board.create('metapostspline', [...point, controls]);

Parameters are the points and controls for the spline interpolation.

Parameters

Name	Type	Attributes	Description
`point`	PointLike	<repeatable>	Unspecified number of points
`controls`	Object		Object containing MetaPost control values like tension, direction, curl.

Example

Metapost spline

var po = [],
    attr = {
        size: 5,
        color: 'red'
    },
    controls;

var tension = board.create('slider', [[-5, 6], [1, 6], [0, 1, 20]], {
     name: 'tension'
});
var curl = board.create('slider', [[-5, 5], [1, 5], [0, 1, 30]], {
     name: 'curl A, D'
});
var dir = board.create('slider', [[-5, 3.5], [2, 3.5], [-180, 0, 180]], {
     name: 'direction B'
});

po.push(board.create('point', [-3, -3]));
po.push(board.create('point', [0, -3]));
po.push(board.create('point', [4, -5]));
po.push(board.create('point', [6, -2]));

var controls = {
    tension: () => tension.Value(),
    0: {
        curl: () => curl.Value()
      },
    1: {
        direction: () => dir.Value()
      },
    3: {
        curl: () => curl.Value()
      },
    isClosed: false
};

// Plot a metapost curve
var cu = board.create('metapostspline', [po, controls], {
  strokeColor: 'blue', strokeWidth: 2
});

Attributes

Own

createPoints

isArrayOfCoordinates

points

createPoints

Description

Controls if the data points of the cardinal spline when given as arrays should be converted into JXG.Points.

Type

Boolean

Default Value

true

See

MetapostSpline#points

Source

options.js, line 7875

isArrayOfCoordinates

Description: If set to true, the supplied coordinates are interpreted as [[x_0, y_0], [x_1, y_1], p, ...]. Otherwise, if the data consists of two arrays of equal length, it is interpreted as [[x_o x_1, ..., x_n], [y_0, y_1, ..., y_n]]
Type: Boolean
Default Value: true
Source: options.js, line 7890