77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
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package basic
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import "math"
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const exactEventTolerance = 2.0 / 86400.0
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func sameEventJD(a, b float64) bool {
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return math.Abs(a-b) <= exactEventTolerance
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}
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func sameEventUTQueryTT(eventUT, queryTT float64) bool {
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return math.Abs(eventUTQueryTTDelta(eventUT, queryTT)) <= exactEventTolerance
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}
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func closestEventUTToQueryTT(queryTT, best float64, candidates ...float64) float64 {
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bestAbs := math.Abs(eventUTQueryTTDelta(best, queryTT))
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for _, candidate := range candidates {
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candidateAbs := math.Abs(eventUTQueryTTDelta(candidate, queryTT))
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if candidateAbs < bestAbs {
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best = candidate
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bestAbs = candidateAbs
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}
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}
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return best
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}
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type phaseEventSearchFunc func(jde, degree float64, next uint8) float64
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type simpleEventSearchFunc func(jde float64) float64
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func inclusiveLastPhaseEvent(jde, degree float64, fn phaseEventSearchFunc) float64 {
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last := fn(jde, degree, 0)
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next := fn(jde, degree, 1)
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if eventUTQueryBeforeOrEqual(next, jde) && eventUTQueryAfterOrEqual(next, jde) {
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return next
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}
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if eventUTQueryBeforeOrEqual(last, jde) {
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return last
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}
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return last
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}
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func inclusiveNextPhaseEvent(jde, degree float64, fn phaseEventSearchFunc) float64 {
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last := fn(jde, degree, 0)
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if eventUTQueryBeforeOrEqual(last, jde) && eventUTQueryAfterOrEqual(last, jde) {
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return last
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}
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next := fn(jde, degree, 1)
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if eventUTQueryAfterOrEqual(next, jde) {
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return next
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}
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return next
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}
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func inclusiveLastSimpleEvent(jde float64, lastFn, nextFn simpleEventSearchFunc) float64 {
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last := lastFn(jde)
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next := nextFn(jde)
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if eventUTQueryBeforeOrEqual(next, jde) && eventUTQueryAfterOrEqual(next, jde) {
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return next
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}
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if eventUTQueryBeforeOrEqual(last, jde) {
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return last
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}
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return last
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}
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func inclusiveNextSimpleEvent(jde float64, lastFn, nextFn simpleEventSearchFunc) float64 {
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last := lastFn(jde)
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if eventUTQueryBeforeOrEqual(last, jde) && eventUTQueryAfterOrEqual(last, jde) {
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return last
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}
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next := nextFn(jde)
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if eventUTQueryAfterOrEqual(next, jde) {
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return next
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}
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return next
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}
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