import { IRenderer , InterpolateOptions , FloatArray } from '../types' ; import { renderPath } from './renderPath' ; import { EPSILON , abs , floor , min } from '../utilities/math' ; import { raiseError } from '../utilities/errors' ; import { normalizePaths } from './normalizePaths' ; import { fillObject } from '../utilities/objects' ; import { createNumberArray } from '../utilities/createNumberArray' ; import { FILL , _ } from '../constants' ; import { Path } from '../path' ; const defaultOptions = { addPoints : 0 , optimize : FILL , origin : { x : 0 , y : 0 } , precision : 0 } ; param leftPath param rightPath export function interpolatePath ( paths , options ) { options = fillObject ( options , defaultOptions ) ; if ( ! paths || paths . length < 2 ) { raiseError ( 'invalid arguments' ) ; } const hlen = paths . length - 1 ; const items = Array ( hlen ) ; for ( let h = 0 ; h < hlen ; h ++ ) { items [ h ] = getPathInterpolator ( paths [ h ] , paths [ h + 1 ] , options ) ; } const formatter = ! options . precision ? _ : ( n ) => n . toFixed ( options . precision ) ; return ( offset ) : string => { const d = hlen * offset ; const flr = min ( floor ( d ) , hlen - 1 ) ; return renderPath ( items [ flr ] ( ( d - flr ) / ( flr + 1 ) ) , formatter ) ; } ; } function getPathInterpolator ( left , right , options ) { const matrix = normalizePaths ( left . getData ( ) , right . getData ( ) , options ) ; const n = matrix [ 0 ] . length ; return ( offset ) => { if ( abs ( offset - 0 ) < EPSILON ) { return left . getStringData ( ) ; } if ( abs ( offset - 1 ) < EPSILON ) { return right . getStringData ( ) ; } const results = Array ( n ) ; for ( let h = 0 ; h < n ; h ++ ) { results [ h ] = mixPoints ( matrix [ 0 ] [ h ] , matrix [ 1 ] [ h ] , offset ) ; } return results ; } ; } export function mixPoints ( a , b , o ) { const alen = a . length ; const results = createNumberArray ( alen ) ; for ( let i = 0 ; i < alen ; i ++ ) { results [ i ] = a [ i ] + ( b [ i ] - a [ i ] ) * o ; } return results ; }