28 lines
694 B
JavaScript
28 lines
694 B
JavaScript
|
export function filterNonNumber (array) {
|
||
|
|
return array.filter(n => typeof n === 'number')
|
||
|
|
}
|
||
|
|
|
||
|
|
export function mulAdd (nums) {
|
||
|
|
nums = filterNonNumber(nums)
|
||
|
|
|
||
|
|
return nums.reduce((all, num) => all + num, 0)
|
||
|
|
}
|
||
|
|
|
||
|
|
export function getTwoPointDistance (pointOne, pointTwo) {
|
||
|
|
const minusX = Math.abs(pointOne[0] - pointTwo[0])
|
||
|
|
|
||
|
|
const minusY = Math.abs(pointOne[1] - pointTwo[1])
|
||
|
|
|
||
|
|
return Math.sqrt(minusX * minusX + minusY * minusY)
|
||
|
|
}
|
||
|
|
|
||
|
|
export function getPolylineLength(points) {
|
||
|
|
const lineSegments = new Array(points.length - 1)
|
||
|
|
.fill(0)
|
||
|
|
.map((foo, i) => [points[i], points[i + 1]])
|
||
|
|
|
||
|
|
const lengths = lineSegments.map(item => getTwoPointDistance(...item))
|
||
|
|
|
||
|
|
return mulAdd(lengths)
|
||
|
|
}
|