resample

README

orb/resample

Package orb/resample has a couple functions for resampling line geometry into more or less evenly spaces points.

func Resample(ls orb.LineString, df orb.DistanceFunc, totalPoints int) orb.LineString
func ToInterval(ls orb.LineString, df orb.DistanceFunc, dist float64) orb.LineString

For example, resampling a line string so the points are 1 planar unit apart:

ls := resample.ToInterval(ls, planar.Distance, 1.0)

Documentation

Overview

Package resample has a couple functions for resampling line geometry into more or less evenly spaces points.

Index

• func Resample(ls orb.LineString, df orb.DistanceFunc, totalPoints int) orb.LineString
• func ToInterval(ls orb.LineString, df orb.DistanceFunc, dist float64) orb.LineString

Examples

• Resample
• ToInterval

Functions

func Resample

func Resample(ls orb.LineString, df orb.DistanceFunc, totalPoints int) orb.LineString

Resample converts the line string into totalPoints-1 evenly spaced segments. This function will modify the linestring input.

Example

package main

import (
	"fmt"

	"github.com/paulmach/orb"
	"github.com/paulmach/orb/planar"
	"github.com/paulmach/orb/resample"
)

func main() {
	ls := orb.LineString{
		{0, 0}, {1, 0}, {2, 0}, {3, 0}, {4, 0},
		{5, 0}, {6, 0}, {7, 0}, {8, 0}, {9, 0}, {10, 0},
	}

	// downsample in this case so there are 2.5 units between points
	ls = resample.ToInterval(ls, planar.Distance, 2.5)
	fmt.Println(ls)

}

Output:

[[0 0] [2.5 0] [5 0] [7.5 0] [10 0]]

func ToInterval

func ToInterval(ls orb.LineString, df orb.DistanceFunc, dist float64) orb.LineString

ToInterval coverts the line string into evenly spaced points of about the given distance. This function will modify the linestring input.

Example

package main

import (
	"fmt"

	"github.com/paulmach/orb"
	"github.com/paulmach/orb/planar"
	"github.com/paulmach/orb/resample"
)

func main() {
	ls := orb.LineString{{0, 0}, {10, 0}}

	// upsample so there are 6 total points
	ls = resample.Resample(ls, planar.Distance, 6)
	fmt.Println(ls)

}

Output:

[[0 0] [2 0] [4 0] [6 0] [8 0] [10 0]]