find-stone-beer / files / coord-round_test.go

coord-round_test.go

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`1ab63e54` 2023-08-27 Pavel Safronov	1	package main
	2
	3	import (
	4	"testing"
	5
	6	"github.com/jftuga/geodist"
	7	"github.com/stretchr/testify/assert"
	8	)
	9
	10	func TestCoordRound(t *testing.T) {
	11	// 47.6254333,-122.1632314
	12
	13	assert.Equal(t, "1.06in", getPrecisionDistance(t, geodist.Coord{Lat: 47.6254333, Lon: -122.1632314}).ToString())
	14	assert.Equal(t, "10.57in", getPrecisionDistance(t, geodist.Coord{Lat: 47.625433, Lon: -122.163231}).ToString())
	15	assert.Equal(t, "5.92in", getPrecisionDistance(t, geodist.Coord{Lat: 47.625433111111, Lon: -122.163231}).ToString())
	16	assert.Equal(t, "880.62ft", getPrecisionDistance(t, geodist.Coord{Lat: 47.625, Lon: -122.163}).ToString())
	17	assert.Equal(t, "167.38mi", getPrecisionDistance(t, geodist.Coord{Lat: 47, Lon: -122}).ToString())
	18
	19	coord := geodist.Coord{Lat: 47.6254333, Lon: -122.1632314}
	20	roundingDistance := ImperialDistance{Miles: 0.25}
	21	roundedCoord, err := RoundCoord(coord, roundingDistance)
	22	assert.Nil(t, err)
	23	precisionDistance := getPrecisionDistance(t, roundedCoord)
	24	assert.Greater(t, precisionDistance.Miles, roundingDistance.Miles)
	25	}
	26
	27	func getPrecisionDistance(t *testing.T, coord geodist.Coord) ImperialDistance {
	28	latDelta := getDelta(coord.Lat)
	29	minLat := coord.Lat - latDelta
	30	maxLat := coord.Lat + latDelta
	31
	32	lonDelta := getDelta(coord.Lon)
	33	minLon := coord.Lon - lonDelta
	34	maxLon := coord.Lon + lonDelta
	35
	36	minCoord := geodist.Coord{Lat: minLat, Lon: minLon}
	37	maxCoord := geodist.Coord{Lat: maxLat, Lon: maxLon}
	38	distMiles, _, err := geodist.VincentyDistance(minCoord, maxCoord)
	39	assert.Nil(t, err)
	40	id := ImperialDistance{Miles: distMiles}
	41	return id
	42	}