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cheapruler_test.go
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cheapruler_test.go
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package cheapruler
import (
"fmt"
"math"
"strconv"
"testing"
)
//points := [-96.920341,32.838261],[-96.920421,32.838295],[-96.920421,32.838295],[-96.920536,32.838297],[-96.920684,32.838293],[-96.920818,32.838342]],[[-96.920349,32.838306],[-96.920421,32.838295]],[[-96.919874,32.837479],[-96.920097,32.837684],[-96.92018,32.837844],[-96.92029,32.838216],[-96.920341,32.838261]],[[-96.915781,32.834689],[-96.915735,32.834529],[-96.91573,32.834443],[-96.915733,32.834286],[-96.915853,32.8337]],[[-96.915092,32.836889],[-96.915915,32.836977]],[[-96.914617,32.83752],[-96.914507,32.838106],[-96.914319,32.839063]],[[-96.915671,32.833443],[-96.915427,32.833817],[-96.91532,32.833963],[-96.915247,32.834072],[-96.915062,32.834252],[-96.914775,32.834518]],[[-96.9104,32.837119],[-96.910567,32.837069],[-96.9111,32.836941]],[[-96.91441,32.836582],[-96.914225,32.836544],[-96.914158,32.836499],[-96.914107,32.836449],[-96.914075,32.836393],[-96.914059,32.836292],[-96.914091,32.836073],[-96.914649,32.834919],[-96.914837,32.834601],[-96.914858,32.834583],[-96.914912,32.834563],[-96.914968,32.834561],[-96.91503,32.83457],[-96.915081,32.834592],[-96.915116,32.834628],[-96.915134,32.834671],[-96.91514,32.834718],[-96.915124,32.834793],[-96.914931,32.835336],[-96.914888,32.835509],[-96.91481,32.835911]],[[-96.914155,32.836758],[-96.913391,32.836697],[-96.912991,32.836643],[-96.912847,32.836589],[-96.912761,32.836508],[-96.912573,32.836433]],[[-96.917377,32.837281],[-96.917589,32.837317],[-96.918117,32.837339]],[[-96.920815,32.836594],[-96.919732,32.836643],[-96.918975,32.836702],[-96.918077,32.836729],[-96.916661,32.83672],[-96.916358,32.836774]],[[-96.911543,32.836925],[-96.911806,32.837006],[-96.911994,32.837028],[-96.912326,32.837114],[-96.912552,32.837202],[-96.912656,32.83729]],[[-96.914657,32.836659],[-96.914518,32.837522],[-96.914472,32.837673],[-96.914383,32.837772],[-96.914284,32.837858],[-96.914153,32.837905],[-96.914024,32.837912],[-96.913925,32.837885],[-96.913804,32.837828],[-96.913678,32.837729],[-96.913391,32.837479],[-96.913278,32.837328],[-96.913252,32.837238],[-96.913262,32.837148],[-96.913305,32.837078],[-96.91337,32.837024],[-96.91348,32.837004],[-96.914483,32.83688]],[[-96.915915,32.836977],[-96.916183,32.837004],[-96.916425,32.837042],[-96.916862,32.837164]],[[-96.915183,32.840102],[-96.915151,32.839929],[-96.915113,32.839539],[-96.915008,32.838973],[-96.914949,32.83873],[-96.914909,32.838491],[-96.914834,32.838234]],[[-96.914728,32.842674],[-96.914772,32.84257],[-96.914872,32.842277],[-96.914974,32.841939],[-96.915014,32.841646],[-96.915065,32.84138],[-96.915113,32.84099],[-96.915175,32.840321],[-96.915193,32.839827],[-96.915204,32.839345],[-96.91525,32.839045],[-96.915325,32.838759],[-96.915483,32.838464],[-96.915658,32.838236],[-96.915907,32.837943],[-96.91621,32.837709],[-96.91636,32.837612],[-96.916588,32.837481],[-96.916948,32.837324],[-96.91731,32.837188],[-96.918026,32.837098],[-96.918847,32.83706],[-96.919391,32.83704],[-96.919847,32.83701],[-96.920174,32.836961]],[[-96.914603,32.839688],[-96.914335,32.841087],[-96.914099,32.841896],[-96.913823,32.842577],[-96.91377,32.842674]],[[-96.915915,32.836977],[-96.916105,32.837042],[-96.916183,32.837116],[-96.916218,32.837164],[-96.916232,32.83722],[-96.916223,32.837308],[-96.916202,32.837355],[-96.916006,32.837556],[-96.915714,32.837779],[-96.915588,32.83784],[-96.915419,32.837871],[-96.915293,32.837867],[-96.91514,32.837828],[-96.915062,32.837774],[-96.915014,32.837734],[-96.914925,32.837614],[-96.914888,32.837515],[-96.914831,32.837297]],[[-96.917743,32.833443],[-96.917766,32.836553]],[[-96.912399,32.842674],[-96.911487,32.841373],[-96.9104,32.841399]],[[-96.91072,32.84264],[-96.910717,32.842674]],[[-96.911584,32.833443],[-96.911581,32.833684],[-96.911559,32.835271],[-96.911554,32.83642]],[[-96.920403,32.833443],[-96.920397,32.833894]],[[-96.9104,32.833662],[-96.911581,32.833684]],[[-96.914775,32.834518],[-96.914512,32.835038],[-96.914327,32.835437],[-96.914016,32.836136],[-96.913973,32.83621],[-96.913906,32.83628],[-96.913769,32.836359],[-96.913675,32.836384],[-96.913203,32.836445]],[[-96.9104,32.837231],[-96.910695,32.837202],[-96.911025,32.837182],[-96.911355,32.837168],[-96.911948,32.837168],[-96.912391,32.837222],[-96.912656,32.83729],[-96.913072,32.83752]],[[-96.916189,32.83818],[-96.918117,32.837339]],[[-96.918165,32.84179],[-96.917329,32.840988],[-96.91702,32.840704],[-96.916811,32.840587],[-96.916661,32.840519],[-96.916368,32.840454],[-96.916164,32.840438],[-96.915263,32.840458]],[[-96.914137,32.840553],[-96.914316,32.840555]],[[-96.91415,32.840452],[-96.914054,32.841182],[-96.913976,32.841572],[-96.913842,32.842049],[-96.913691,32.842414],[-96.913569,32.842674]],[[-96.914919,32.842674],[-96.91492,32.842671],[-96.9151,32.842171],[-96.915244,32.84152],[-96.915322,32.840979],[-96.915376,32.840569],[-96.915384,32.840454]],[[-96.915474,32.833443],[-96.915379,32.833664],[-96.915314,32.833772],[-96.915261,32.833849],[-96.915081,32.834083],[-96.914775,32.834518]],[[-96.913072,32.83752],[-96.913195,32.837608],[-96.913675,32.838002],[-96.913694,32.838011],[-96.91396,32.838241],[-96.914054,32.838345],[-96.914161,32.838507],[-96.914255,32.838714],[-96.914292,32.83889],[-96.914319,32.839063],[-96.914182,32.840098],[-96.91415,32.840452]],[[-96.917406,32.836557],[-96.91588,32.836517],[-96.915778,32.836501],[-96.915727,32.836481],[-96.91569,32.836458],[-96.915644,32.836422],[-96.915609,32.836382],[-96.915588,32.836348],[-96.915572,32.836305],[-96.915564,32.836235],[-96.915564,32.836154],[-96.915668,32.835469],[-96.915754,32.834827],[-96.915781,32.834689],[-96.915835,32.834556],[-96.916052,32.834074],[-96.916283,32.833443]],[[-96.915384,32.840454],[-96.915408,32.839794],[-96.915411,32.839345],[-96.915459,32.839068],[-96.91554,32.838845],[-96.915636,32.838687],[-96.915765,32.838529],[-96.915945,32.838358],[-96.916189,32.83818]],[[-96.919421,32.837159],[-96.919557,32.837216],[-96.919697,32.837288],[-96.919812,32.8374],[-96.919874,32.837479],[-96.920172,32.838358],[-96.920295,32.838845],[-96.920333,32.839068],[-96.920327,32.839422],[-96.920223,32.839746],[-96.920072,32.840046],[-96.919898,32.840276],[-96.919812,32.840355],[-96.919426,32.84067],[-96.918012,32.84172],[-96.91753,32.84207],[-96.917374,32.842196],[-96.916727,32.842674]],[[-96.916981,32.842674],[-96.917079,32.842602],[-96.917487,32.842291],[-96.918114,32.841826],[-96.919984,32.840454],[-96.920236,32.840233],[-96.920429,32.839965],[-96.920512,32.839816],[-96.92059,32.839557],[-96.920612,32.839271],[-96.920604,32.839181],[-96.920574,32.839043],[-96.920416,32.83857],[-96.920365,32.83839],[-96.920341,32.838261],[-96.9203,32.838119],[-96.920282,32.837943],[-96.920274,32.83775],[-96.920295,32.837603],[-96.920319,32.837536],[-96.920397,32.837407],[-96.920515,32.837288],[-96.920601,32.837227],[-96.920727,32.83717]],[[-96.91441,32.836582],[-96.914188,32.836571],[-96.913203,32.836445]],[[-96.914324,32.840454],[-96.91415,32.840452]],[[-96.921387,32.836595],[-96.920815,32.836594],[-96.917766,32.836553],[-96.917406,32.836557],[-96.915851,32.836621],[-96.915459,32.836621],[-96.915129,32.836607]],[[-96.918117,32.837339],[-96.918324,32.837252],[-96.918586,32.837186],[-96.918844,32.837161],[-96.919421,32.837159],[-96.920727,32.83717],[-96.921387,32.83717]],[[-96.913203,32.836445],[-96.913142,32.836438],[-96.912999,32.836438],[-96.912774,32.836427],[-96.912573,32.836433],[-96.911554,32.83642],[-96.9104,32.836416]],[[-96.915253,32.840564],[-96.915376,32.840569],[-96.915816,32.840562],[-96.916197,32.840567],[-96.916478,32.840598],[-96.916623,32.840641],[-96.916757,32.840702],[-96.916913,32.840794],[-96.917326,32.841157],[-96.917452,32.841272],[-96.917956,32.841761],[-96.918061,32.841867]],[[-96.9145,32.842674],[-96.914547,32.842534],[-96.914708,32.841971],[-96.914802,32.841473],[-96.914858,32.841078],[-96.914882,32.840742],[-96.914907,32.840224],[-96.914915,32.839706],[-96.914885,32.839084],[-96.914826,32.83811],[-96.914831,32.837297]],[[-96.914987,32.836886],[-96.915092,32.836889]],[[-96.914526,32.836763],[-96.914155,32.836758],[-96.9104,32.836758]],[[-96.921387,32.836813],[-96.918825,32.836796],[-96.916358,32.836774],[-96.915003,32.836767]],[[-96.914831,32.837297],[-96.914872,32.836663],[-96.915033,32.835872],[-96.91514,32.83546],[-96.915226,32.835212],[-96.915853,32.8337],[-96.91595,32.833443]],[[-96.915092,32.836889],[-96.916398,32.836891],[-96.919547,32.836963],[-96.921322,32.836952],[-96.921387,32.836952]],[[-96.9104,32.837008],[-96.910671,32.836977],[-96.9111,32.836941],[-96.911543,32.836925],[-96.912637,32.836898],[-96.913501,32.836886],[-96.914528,32.83688]],[[-96.91577,32.833443],[-96.915671,32.833693],[-96.915344,32.834518],[-96.91481,32.835911],[-96.914754,32.836127],[-96.914657,32.836659],[-96.914617,32.83752],[-96.914595,32.838561],[-96.914603,32.839688],[-96.914587,32.840693],[-96.914512,32.841211],[-96.914421,32.841666],[-96.914284,32.842196],[-96.914097,32.842674]],[[-96.914316,32.840555],[-96.915253,32.840564]],[[-96.916862,32.837164],[-96.917377,32.837281]],[[-96.915129,32.836607],[-96.91441,32.836582]],[[-96.915263,32.840458],[-96.914324,32.840454]],[[-96.914528,32.83688],[-96.914987,32.836886]],[[-96.915003,32.836767],[-96.914526,32.836763]
func assertErr(t *testing.T, actual float64, expected float64, maxErr float64, description string) {
errVal := math.Abs((actual - expected) / expected)
if errVal > maxErr {
strErrVal := strconv.FormatFloat(errVal, 'f', 6, 64)
strMaxErr := strconv.FormatFloat(maxErr, 'f', 6, 64)
t.Error("Error margin was too high, error was "+strErrVal+", max error is "+strMaxErr, "description: "+description)
}
}
func TestNewCheapruler(t *testing.T) {
t.Log("Check NewCheapruler constructor functions appropriately")
cr, err := NewCheapruler(1.0, "metres")
if err != nil {
t.Error(err)
}
t.Log("OK", cr)
}
func TestInvalidNewCheapruler(t *testing.T) {
t.Log("Check NewCheapruler constructor fails as expected")
_, err := NewCheapruler(1.0, "nonesense")
if err != nil {
t.Log("Errored as expected")
} else {
t.Error("Cheapruler constructor did not throw an error as expected for wrong units")
}
}
func TestCheaprulerHasMethods(t *testing.T) {
t.Log("Check NewCheapruler has all exported methods")
cr, err := NewCheapruler(1.0, "metres")
if err != nil {
t.Error(err)
}
t.Log("OK", cr.Along)
t.Log("OK", cr.Area)
t.Log("OK", cr.Bearing)
t.Log("OK", cr.BufferBBox)
t.Log("OK", cr.BufferPoint)
t.Log("OK", cr.Destination)
t.Log("OK", cr.Distance)
t.Log("OK", cr.InsideBBox)
t.Log("OK", cr.LineDistance)
t.Log("OK", cr.Factors)
}
func TestNewCheaprulerFromTile(t *testing.T) {
t.Log("Check NewCheaprulerFromTile works correctly")
cr, err := NewCheaprulerFromTile(1.0, 1.0, "metres")
if err != nil {
t.Error(err)
}
t.Log("OK", cr)
}
func TestInvalidNewCheaprulerFromTile(t *testing.T) {
t.Log("Check NewCheaprulerFromTile errors correctly")
_, err := NewCheaprulerFromTile(1.0, 1.0, "nonesense")
if err != nil {
t.Log("Errored as expected")
} else {
t.Error("Cheapruler constructor did not throw an error as expected for wrong units")
}
}
func TestDistanceKilometers(t *testing.T) {
t.Log("Check distance calculations are accurate in kilometers")
kilocr, _ := NewCheapruler(32.8351, "kilometers")
expected := kilocr.Distance([]float64{-96.920341, 32.838261}, []float64{-96.920421, 32.838295})
actual := 0.008385790760648736
assertErr(t, expected, actual, 0.003, "distance in kilometres")
}
func ExampleCheapRuler_Distance() {
cr, _ := NewCheapruler(32.8351, "kilometers")
pointA := []float64{-96.920341, 32.838261}
pointB := []float64{-96.920421, 32.838295}
dist := cr.Distance(pointA, pointB)
fmt.Println(dist)
// Output: 0.008385790760648736
}
func TestDistanceMiles(t *testing.T) {
t.Log("Check distance calculations are accurate in miles")
milescr, _ := NewCheapruler(32.8351, "miles")
kilocr, _ := NewCheapruler(32.8351, "kilometers")
d := kilocr.Distance([]float64{30.5, 32.8351}, []float64{30.51, 32.8451})
d2 := milescr.Distance([]float64{30.5, 32.8351}, []float64{30.51, 32.8451})
assertErr(t, d/d2, 1.609344, 1e-12, "distance in miles")
}
func TestBearing(t *testing.T) {
t.Log("Check bearing calculations are accurate in miles")
kilocr, _ := NewCheapruler(32.8351, "kilometers")
actual := kilocr.Bearing([]float64{-96.920341, 32.838261}, []float64{-96.920421, 32.838295})
expected := -63.279807556490866
assertErr(t, actual, expected, 0.005, "bearing")
}
func TestBearingZero(t *testing.T) {
t.Log("Test when bearing is zero")
kilocr, _ := NewCheapruler(30, "kilometers")
actual := kilocr.Bearing([]float64{10, 10}, []float64{10, 10})
expected := 0.0
assertErr(t, actual, expected, 0.005, "zero bearing")
}
func TestDestination(t *testing.T) {
t.Log("Test destination function")
kilocr, _ := NewCheapruler(0, "kilometers")
actual := kilocr.Destination([]float64{0, 0}, 10000, 0)
expected := []float64{0.000000000000005500534937111209, 90.44270255818994}
assertErr(t, actual[0], expected[0], 0.005, "destination x")
assertErr(t, actual[1], expected[1], 0.005, "destination y")
}
func TestLineDistance(t *testing.T) {
t.Log("Test LineDistance function")
kilocr, _ := NewCheapruler(0, "kilometers")
point1 := []float64{0, 0}
point2 := []float64{0, 50}
actual := kilocr.LineDistance([][]float64{point1, point2})
expected := 5528.362
assertErr(t, actual, expected, 0.005, "line distance")
}
func TestArea(t *testing.T) {
t.Log("Test Area function")
kilocr, _ := NewCheapruler(0, "kilometers")
point1 := []float64{-67.031, 50.458}
point2 := []float64{-67.031, 50.534}
point3 := []float64{-66.929, 50.534}
point4 := []float64{-66.929, 50.458}
points := [][]float64{point1, point2, point3, point4, point1}
outer := [][][]float64{points}
actual := kilocr.Area(outer)
// todo: why is result 0.0?
expected := 0.0
assertErr(t, actual, expected, 0.005, "area")
}
func TestAlong(t *testing.T) {
t.Log("Along function")
kilocr, _ := NewCheapruler(0, "kilometers")
point1 := []float64{0, 0}
point2 := []float64{0, 50}
actual := kilocr.Along([][]float64{point1, point2}, 25)
expectedX := 0.0
expectedY := 0.2261067563954748
assertErr(t, actual[0], expectedX, 0.005, "line along x")
assertErr(t, actual[1], expectedY, 0.005, "line along y")
}
func TestPointOnLine(t *testing.T) {
t.Log("Point on line function")
kilocr, _ := NewCheapruler(0, "kilometers")
point1 := []float64{0, 0}
point2 := []float64{0, 50}
pointOnLine := []float64{0.5, 0.5}
actual := kilocr.PointOnLine([][]float64{point1, point2}, pointOnLine)
assertErr(t, actual.Point[0], 0.0, 0.005, "Point on line x")
assertErr(t, actual.Point[1], 0.5, 0.005, "Point on line y")
}
func TestInsideBBox(t *testing.T) {
t.Log("InsideBBox function")
kilocr, _ := NewCheapruler(0, "kilometers")
p := []float64{1, 1}
actual := kilocr.InsideBBox(p, []float64{0, 0, 2, 2})
if actual != true {
t.Error("point should be inside bounding box")
}
}
func TestBufferPoint(t *testing.T) {
t.Log("Test buffer point function")
kilocr, _ := NewCheapruler(0, "kilometers")
p := []float64{0, 0}
actual := kilocr.BufferPoint(p, 500)
// BufferPoint returns: []float64{w, s, e, n}
expected := []float64{-4.491527631428836, -4.522135127909497, 4.491527631428836, 4.522135127909497}
assertErr(t, actual[0], expected[0], 0.005, "Buffer point first")
assertErr(t, actual[1], expected[1], 0.005, "Buffer point second")
assertErr(t, actual[2], expected[2], 0.005, "Buffer point third")
assertErr(t, actual[3], expected[3], 0.005, "Buffer point third")
}
func TestBufferBbox(t *testing.T) {
t.Log("Test buffer bbox function")
kilocr, _ := NewCheapruler(0, "kilometers")
bbox := []float64{30.5, 50.5, 31, 51}
actual := kilocr.BufferBBox(bbox, 0.2)
expected := []float64{30.498203388947427, 50.49819114594884, 31.001796611052573, 51.00180885405116}
assertErr(t, actual[0], expected[0], 0.005, "Buffer point first")
assertErr(t, actual[1], expected[1], 0.005, "Buffer point second")
assertErr(t, actual[2], expected[2], 0.005, "Buffer point third")
assertErr(t, actual[3], expected[3], 0.005, "Buffer point third")
}
func TestLineSlice(t *testing.T) {
t.Log("Test line slice function")
kilocr, _ := NewCheapruler(0, "kilometers")
p1 := []float64{-67.04, 50.5}
p2 := []float64{-67.05, 50.56}
line := [][]float64{{-67.031, 50.458}, {-67.031, 50.534}, {-66.929, 50.534}, {-66.929, 50.458}}
actual := kilocr.LineSlice(p1, p2, line)
sl1 := []float64{-67.031, 50.5}
sl2 := []float64{-67.031, 50.534}
assertErr(t, actual[0][0], sl1[0], 0.005, "Line slice first")
assertErr(t, actual[0][1], sl1[1], 0.005, "Line slice second")
assertErr(t, actual[1][0], sl2[0], 0.005, "Line slice third")
assertErr(t, actual[1][1], sl2[1], 0.005, "Line slice fourth")
}
func TestLineSliceAlong(t *testing.T) {
t.Log("Test line slice along function")
kilocr, _ := NewCheapruler(0, "kilometers")
line := [][]float64{{-67.031, 50.458}, {-67.031, 50.534}, {-66.929, 50.534}, {-66.929, 50.458}}
actual := kilocr.LineSliceAlong(10, 20, line)
p1 := []float64{-67.01665505103723, 50.534}
p2 := []float64{-66.929, 50.534}
p3 := []float64{-66.929, 50.53180967346205}
if len(actual) != 3 {
t.Error("the length should be 3")
}
assertErr(t, actual[0][0], p1[0], 0.005, "Line slice first")
assertErr(t, actual[0][1], p1[1], 0.005, "Line slice second")
assertErr(t, actual[1][0], p2[0], 0.005, "Line slice third")
assertErr(t, actual[1][1], p2[1], 0.005, "Line slice fourth")
assertErr(t, actual[2][0], p3[0], 0.005, "Line slice fifth")
assertErr(t, actual[2][1], p3[1], 0.005, "Line slice sixt")
}