Merge pull request #124 from observerly/feature/dusk/GetObjectTransit

feat: Added GetObjectTransit() to dusk module.

coverage.txt

@@ -1,89 +1,4 @@
 mode: atomic
-github.com/observerly/dusk/pkg/dusk/transit.go:22.77,30.2 3 22
-github.com/observerly/dusk/pkg/dusk/transit.go:41.135,42.43 1 8
-github.com/observerly/dusk/pkg/dusk/transit.go:51.2,74.3 9 8
-github.com/observerly/dusk/pkg/dusk/transit.go:42.43,48.3 1 0
-github.com/observerly/dusk/pkg/dusk/transit.go:86.129,87.43 1 5
-github.com/observerly/dusk/pkg/dusk/transit.go:95.2,98.62 2 4
-github.com/observerly/dusk/pkg/dusk/transit.go:103.2,107.3 1 4
-github.com/observerly/dusk/pkg/dusk/transit.go:87.43,93.3 1 1
-github.com/observerly/dusk/pkg/dusk/transit.go:98.62,101.3 2 4
-github.com/observerly/dusk/pkg/dusk/transit.go:119.134,120.43 1 5
-github.com/observerly/dusk/pkg/dusk/transit.go:128.2,133.16 3 3
-github.com/observerly/dusk/pkg/dusk/transit.go:137.2,147.8 4 3
-github.com/observerly/dusk/pkg/dusk/transit.go:120.43,125.3 1 2
-github.com/observerly/dusk/pkg/dusk/transit.go:133.16,135.3 1 0
-github.com/observerly/dusk/pkg/dusk/transit.go:150.135,153.16 2 2
-github.com/observerly/dusk/pkg/dusk/transit.go:157.2,157.47 1 2
-github.com/observerly/dusk/pkg/dusk/transit.go:162.2,171.39 5 1
-github.com/observerly/dusk/pkg/dusk/transit.go:190.2,190.20 1 1
-github.com/observerly/dusk/pkg/dusk/transit.go:153.16,155.3 1 0
-github.com/observerly/dusk/pkg/dusk/transit.go:157.47,159.3 1 1
-github.com/observerly/dusk/pkg/dusk/transit.go:171.39,184.91 4 424
-github.com/observerly/dusk/pkg/dusk/transit.go:184.91,186.9 2 1
-github.com/observerly/dusk/pkg/dusk/trigonometry.go:10.30,12.2 1 275825
-github.com/observerly/dusk/pkg/dusk/trigonometry.go:14.30,16.2 1 197023
-github.com/observerly/dusk/pkg/dusk/trigonometry.go:18.44,20.2 1 541
-github.com/observerly/dusk/pkg/dusk/trigonometry.go:22.30,24.2 1 13071
-github.com/observerly/dusk/pkg/dusk/trigonometry.go:26.31,28.2 1 39408
-github.com/observerly/dusk/pkg/dusk/trigonometry.go:30.31,32.2 1 13454
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-github.com/observerly/dusk/pkg/dusk/trigonometry.go:38.36,40.2 1 25976
-github.com/observerly/dusk/pkg/dusk/twilight.go:38.163,49.16 5 9
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-github.com/observerly/dusk/pkg/dusk/twilight.go:101.146,106.2 2 3
-github.com/observerly/dusk/pkg/dusk/lawrence.go:15.59,24.12 3 3
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-github.com/observerly/dusk/pkg/dusk/lawrence.go:37.62,50.11 5 12991
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-github.com/observerly/dusk/pkg/dusk/coordinates.go:136.149,151.2 6 13407
-github.com/observerly/dusk/pkg/dusk/epoch.go:31.56,33.2 1 18
-github.com/observerly/dusk/pkg/dusk/epoch.go:41.48,46.2 2 117862
-github.com/observerly/dusk/pkg/dusk/epoch.go:53.45,55.2 1 79
-github.com/observerly/dusk/pkg/dusk/epoch.go:63.60,93.13 15 13412
-github.com/observerly/dusk/pkg/dusk/epoch.go:97.2,97.12 1 13412
-github.com/observerly/dusk/pkg/dusk/epoch.go:93.13,95.3 1 4588
-github.com/observerly/dusk/pkg/dusk/epoch.go:106.74,114.11 4 13410
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-github.com/observerly/dusk/pkg/dusk/epoch.go:294.92,312.12 9 17
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-github.com/observerly/dusk/pkg/dusk/epoch.go:324.11,326.3 1 1
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 github.com/observerly/dusk/pkg/dusk/lunar.go:41.2,41.10 1 13006
 github.com/observerly/dusk/pkg/dusk/lunar.go:37.11,39.3 1 16
@@ -162,6 +77,83 @@ github.com/observerly/dusk/pkg/dusk/lunar.go:855.30,857.4 1 4
 github.com/observerly/dusk/pkg/dusk/lunar.go:874.106,877.16 2 2
 github.com/observerly/dusk/pkg/dusk/lunar.go:881.2,884.8 1 2
 github.com/observerly/dusk/pkg/dusk/lunar.go:877.16,879.3 1 0
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+github.com/observerly/dusk/pkg/dusk/trigonometry.go:18.44,20.2 1 541
+github.com/observerly/dusk/pkg/dusk/trigonometry.go:22.30,24.2 1 13089
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+github.com/observerly/dusk/pkg/dusk/astrometry.go:14.52,18.12 2 13833
+github.com/observerly/dusk/pkg/dusk/astrometry.go:22.2,22.11 1 13833
+github.com/observerly/dusk/pkg/dusk/astrometry.go:18.12,20.3 1 2643
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 github.com/observerly/dusk/pkg/dusk/solar.go:23.45,26.2 1 42
 github.com/observerly/dusk/pkg/dusk/solar.go:35.50,38.2 1 32
 github.com/observerly/dusk/pkg/dusk/solar.go:47.62,50.2 1 31
@@ -179,17 +171,33 @@ github.com/observerly/dusk/pkg/dusk/solar.go:189.70,200.2 4 4
 github.com/observerly/dusk/pkg/dusk/solar.go:208.74,222.12 6 2
 github.com/observerly/dusk/pkg/dusk/solar.go:226.2,229.3 1 2
 github.com/observerly/dusk/pkg/dusk/solar.go:222.12,224.3 1 2
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pkg/dusk/transit.go

@@ -9,6 +9,7 @@ import (
 
 type Transit struct {
 	Rise     *time.Time
+	Maximum  *time.Time
 	Set      *time.Time
 	Duration time.Duration
 }
@@ -199,3 +200,63 @@ func GetObjectTransitMaximaTime(datetime time.Time, eq EquatorialCoordinate, lat
 
 	return maxima, nil
 }
+
+/*
+	GetObjectTransit()
+
+	@param datetime - the time to calculate the rise and set times for
+	@param eq - the EquatorialCoordinate{} of the object to calculate the rise and set times for
+	@param latitude - the latitude of the observer
+	@param longitude - the longitude of the observer
+	@returns a Transit struct which contains the rise, maximum and set times of the object in local time
+*/
+func GetObjectTransit(datetime time.Time, eq EquatorialCoordinate, latitude float64, longitude float64) (*Transit, error) {
+	transit, err := GetObjectRiseObjectSetTimes(datetime, eq, latitude, longitude)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if transit.Rise == nil || transit.Set == nil {
+		return &Transit{
+			Rise:     nil,
+			Set:      nil,
+			Maximum:  nil,
+			Duration: 0,
+		}, nil
+	}
+
+	// find the number of minutes between the rise and set times:
+	minutes := int(math.Ceil(math.Abs(transit.Duration.Minutes())))
+
+	// create an empty list of horizontalCoordinate structs:
+	horizontalCoordinates := make([]TransitHorizontalCoordinate, minutes)
+
+	d := *transit.Rise
+
+	for i := range horizontalCoordinates {
+		// Get the current horizontal position of the object:
+		var hz HorizontalCoordinate = ConvertEquatorialCoordinateToHorizontal(d, longitude, latitude, eq)
+
+		horizontalCoordinates[i] = TransitHorizontalCoordinate{
+			Datetime: d,
+			Altitude: hz.Altitude,
+			Azimuth:  hz.Azimuth,
+		}
+
+		d = d.Add(time.Minute)
+
+		// Since our object's initial direction is rising, we can assume the following comparison:
+		if (i > 0) && (horizontalCoordinates[i].Altitude < horizontalCoordinates[i-1].Altitude) {
+			transit.Maximum = &horizontalCoordinates[i-1].Datetime
+			break
+		}
+	}
+
+	return &Transit{
+		Rise:     transit.Rise,
+		Set:      transit.Set,
+		Maximum:  transit.Maximum,
+		Duration: transit.Duration,
+	}, nil
+}

pkg/dusk/transit_test.go

@@ -157,3 +157,61 @@ func TestGetObjectTransitMaximaTimeNoRiseNoSet(t *testing.T) {
 	}
 
 }
+
+func TestGetObjectTransit(t *testing.T) {
+	timezone, _ := time.LoadLocation("America/New_York")
+
+	var datetime time.Time = time.Date(2015, 6, 6, 0, 0, 0, 0, time.UTC)
+
+	got, err := GetObjectTransit(datetime, EquatorialCoordinate{RightAscension: 243.675000, Declination: 25.9613889}, 38.250132, -78.300288)
+
+	if err != nil {
+		t.Errorf("got %v, wanted nil", err)
+	}
+
+	var rise = time.Date(2015, 6, 6, 16, 57, 48, 562000000, timezone)
+
+	var set = time.Date(2015, 6, 7, 7, 55, 55, 501000000, timezone)
+
+	if rise.After(set) {
+		t.Errorf("the object must rise before it sets")
+	}
+
+	if got.Rise.String() != rise.String() {
+		t.Errorf("got %v, wanted %v", *got.Rise, rise)
+	}
+
+	if got.Set.String() != set.String() {
+		t.Errorf("got %v, wanted %v", *got.Set, set)
+	}
+
+	if got.Maximum == nil {
+		t.Errorf("got %v, wanted a maxima time", got)
+	}
+
+	if got.Maximum.Before(*got.Rise) || got.Maximum.After(*got.Set) {
+		t.Errorf("maxima time must be between rise and set")
+	}
+}
+
+func TestGetObjectTransitNoRiseNoSetNoMaximum(t *testing.T) {
+	var datetime time.Time = time.Date(2015, 6, 6, 0, 0, 0, 0, time.UTC)
+
+	got, err := GetObjectTransit(datetime, EquatorialCoordinate{RightAscension: 90, Declination: -60}, 45.250132, -100.300288)
+
+	if err != nil {
+		t.Errorf("got %v, wanted nil", err)
+	}
+
+	if got.Rise != nil {
+		t.Errorf("got %v, but expected the object to never rise for the given paramaters", got)
+	}
+
+	if got.Set != nil {
+		t.Errorf("got %v, but expected the object to never set for the given parameters", got)
+	}
+
+	if got.Maximum != nil {
+		t.Errorf("got %v, but expected the object to never reach a maxima above the horizon for the given paramaters", got)
+	}
+}