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#![feature(external_doc)] use ta_common::fixed_queue::FixedQueue; use ta_common::traits::Indicator; #[doc(include = "../README.md")] pub struct SMA { accumulator: f64, period: u32, history: FixedQueue<f64>, } impl SMA { pub fn new(period: u32) -> SMA { Self { accumulator: 0_f64, period, history: FixedQueue::new(period), } } pub fn get_total(&self) -> f64 { return self.accumulator; } } impl Indicator<f64, Option<f64>> for SMA { fn next(&mut self, input: f64) -> Option<f64> { if self.history.is_full() { let out = self.history.at(0).unwrap(); self.history.add(input); self.accumulator = self.accumulator - out + input; } else { self.history.add(input); self.accumulator = self.accumulator + input; } if self.history.is_full() { return Some(self.accumulator/self.period as f64); } None } fn reset(&mut self) { self.history.clear(); self.accumulator = 0_f64; } } #[cfg(test)] mod tests { use crate::SMA; use ta_common::traits::Indicator; #[test] fn it_works() { let mut sma = SMA::new(5); assert_eq!(sma.next(81.59), None); assert_eq!(sma.next(81.06), None); assert_eq!(sma.next(82.87), None); assert_eq!(sma.next(83.00), None); assert_eq!(sma.next(83.61), Some(82.426)); assert_eq!(sma.next(83.15), Some(82.73799999999999)); assert_eq!(sma.next(82.84), Some(83.09399999999998)); assert_eq!(sma.next(83.99), Some(83.31799999999998)); assert_eq!(sma.next(84.55), Some(83.62799999999999)); assert_eq!(sma.next(84.36), Some(83.77799999999999)); assert_eq!(sma.next(85.53), Some(84.25399999999998)); assert_eq!(sma.next(86.54), Some(84.99399999999997)); assert_eq!(sma.next(86.89), Some(85.57399999999997)); assert_eq!(sma.next(87.77), Some(86.21799999999996)); assert_eq!(sma.next(87.29), Some(86.80399999999996)); } }