equationjs

Equation

Package includes equations of: Line

Installation:

npm install equationjs --save

Test:

npm run test

Line

$$ y=mx+b $$

Methods:

• crossTwoPoint

This method creates line equation which is crossing from two point that is given as two parameter for function.

Example:

    let Line = require('equationjs').Line
    let line = new Line()
    let A = {x: 0, y: 0}
    let B = {x: 2, y: 2}
    let  y  =  line.crossTwoPoint(A, B)
    console.log(line) // Line { m: 3, b: -2 }
    console.log(y(5)) // 5

• distanceFromPoint

This method calculates created line distance from a given point. this function also has a static version that takes point, m and b

Example:

    //we could created line in different methods
    //here we create line from two point and then calculate line distance from point C
    let Line = require('equationjs').Line
    let line = new Line()
    let A = {x: 0, y: 0}
    let B = {x: 2, y: 2}
    let C = {x: 16, y: 4}
    line.crossTwoPoint(A, B)
    let d = line.distanceFromPoint(C)
    console.log(d) // 6

Example:

    //here we create line from with known m and b and then calculate line distance from point C
    let Line = require('equationjs').Line
    let line = new Line()
    line.create(1, 0)
    let C = {x: 16, y: 4}
    let d = line.distanceFromPoint(C)
    console.log(d) // 6

• angle static method

This method takes two created instance of line class and returns angle between them in degree

Example:

    let Line = require('equationjs').Line
    let  line1  =  new  Line()
    line1.create(1, 0)
    let  line2  =  new  Line()
    line2.create(-1, 0)
    let t = Line.angle(line1, line2)
    console.log(t) //90

• twoLineDistance static method

This method takes two created instance of line class and returns distance between them

Example:

    let Line = require('equationjs').Line
    let  line1  =  new  Line()
    line1.create(4, -3)
    let  line2  =  new  Line()
    line2.create(4, 10)
    let  d  =  Line.twoLineDistance(line1, line2)
    console.log(d) //4.913538149119954

• neighbors

This method takes array of points around line and calculates their distance from line and average of all neighbors

Example:

    let Line = require('equationjs').Line
    let  line  =  new  Line()
    line.create(4, -3)
    let  points  = [
        {x:  1, y:  3},
        {x:  4, y:  -2},
        {x:  -3, y:  0},
        {x:  3, y:  1},
        {x:  6, y:  6},
    ]
    let  result  =  line.neighboors(points)
    console.log(result)
    /*
    {  
        list:[  
                -0.7559289460184544,  
                5.669467095138408,  
                -5.669467095138408,  
                3.0237157840738176,  
                5.669467095138408  
            ],  
        sum: 7.937253933193771,  
        average: 1.5874507866387542  
    }
    */

road map for classes:

• Line
• Quadratic
• Polynomial

any question ? Ask It :)

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