✨ TRIX, TRIX signal 지표 추가 (#23)

* ✨ TRIX 지표 추가와 패치 버전 갱신

* ♻️ TRIX 계산에 기존 EMA 함수 사용

* 🧪 TRIX 테스트 블록 정리

* ♻️ Polars TRIX 중복 API 제거

Author: mingi3314

core/src/indicators/mod.rs

@@ -37,6 +37,7 @@ mod sonar;
 mod stochf;
 mod stochrsi;
 mod stochs;
+mod trix;
 mod ultosc;
 mod vr;
 mod willr;
@@ -81,6 +82,7 @@ pub use sonar::*;
 pub use stochf::*;
 pub use stochrsi::*;
 pub use stochs::*;
+pub use trix::*;
 pub use ultosc::*;
 pub use vr::*;
 pub use willr::*;

core/src/indicators/trix.rs

@@ -0,0 +1,164 @@
+use crate::indicators::ema::ema;
+
+pub fn trix(
+    data: &[Option<f64>],
+    period: usize,
+    signal_period: usize,
+) -> (Vec<Option<f64>>, Vec<Option<f64>>) {
+    let line = trix_line(data, period);
+    let signal = ema(&line, signal_period);
+
+    (line, signal)
+}
+
+pub fn trix_line(data: &[Option<f64>], period: usize) -> Vec<Option<f64>> {
+    let ema_values = ema(data, period);
+    let double_ema = ema(&ema_values, period);
+    let triple_ema = ema(&double_ema, period);
+
+    triple_ema
+        .iter()
+        .enumerate()
+        .map(|(idx, &current)| {
+            if idx == 0 {
+                return None;
+            }
+
+            match (current, triple_ema[idx - 1]) {
+                (Some(current), Some(previous)) if previous != 0.0 => {
+                    Some((current - previous) * 100.0 / previous)
+                }
+                _ => None,
+            }
+        })
+        .collect()
+}
+
+pub fn trix_signal(data: &[Option<f64>], period: usize, signal_period: usize) -> Vec<Option<f64>> {
+    let line = trix_line(data, period);
+    ema(&line, signal_period)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::indicators::ema::ema;
+    use crate::testutils;
+    use crate::utils::round_vec;
+
+    #[test]
+    fn test_trix() {
+        // Given
+        let test_cases = vec!["005930", "TSLA"];
+
+        // When
+        for symbol in test_cases {
+            let input = testutils::load_data(&format!("../data/{}.json", symbol), "c")
+                .into_iter()
+                .map(Some)
+                .collect::<Vec<_>>();
+            let (line, signal) = trix(&input, 12, 9);
+
+            let expected_line = testutils::load_expected::<Option<f64>>(&format!(
+                "../data/expected/trix_line_{}.json",
+                symbol
+            ));
+            let expected_signal = testutils::load_expected::<Option<f64>>(&format!(
+                "../data/expected/trix_signal_{}.json",
+                symbol
+            ));
+
+            // Then
+            assert_eq!(
+                round_vec(line, 8),
+                round_vec(expected_line, 8),
+                "TRIX line test failed for symbol {}.",
+                symbol
+            );
+            assert_eq!(
+                round_vec(signal, 8),
+                round_vec(expected_signal, 8),
+                "TRIX signal test failed for symbol {}.",
+                symbol
+            );
+        }
+    }
+
+    #[test]
+    fn test_trix_matches_composed_ema_across_gaps() {
+        // Given
+        let input = vec![
+            Some(1.0),
+            Some(2.0),
+            Some(3.0),
+            Some(4.0),
+            None,
+            Some(5.0),
+            Some(6.0),
+            Some(7.0),
+            Some(8.0),
+            Some(9.0),
+        ];
+
+        // When
+        let line = trix_line(&input, 2);
+        let single = ema(&input, 2);
+        let double = ema(&single, 2);
+        let triple = ema(&double, 2);
+        let expected = triple
+            .iter()
+            .enumerate()
+            .map(|(idx, &current)| {
+                if idx == 0 {
+                    return None;
+                }
+
+                match (current, triple[idx - 1]) {
+                    (Some(current), Some(previous)) if previous != 0.0 => {
+                        Some((current - previous) * 100.0 / previous)
+                    }
+                    _ => None,
+                }
+            })
+            .collect::<Vec<_>>();
+
+        // Then
+        assert_eq!(round_vec(line, 8), round_vec(expected, 8));
+    }
+
+    #[test]
+    fn test_trix_signal_follows_base_ema_contract_across_gaps() {
+        // Given
+        let input = vec![
+            Some(1.0),
+            Some(2.0),
+            Some(3.0),
+            Some(4.0),
+            None,
+            Some(5.0),
+            Some(6.0),
+            Some(7.0),
+            Some(8.0),
+            Some(9.0),
+        ];
+
+        // When
+        let (line, signal) = trix(&input, 2, 2);
+
+        // Then
+        assert_eq!(signal, ema(&line, 2));
+        assert_eq!(signal, trix_signal(&input, 2, 2));
+    }
+
+    #[test]
+    fn test_trix_returns_none_when_previous_triple_ema_is_zero() {
+        // Given
+        let input = vec![Some(0.0), Some(0.0), Some(1.0), Some(2.0)];
+
+        // When
+        let line = trix_line(&input, 1);
+
+        // Then
+        assert_eq!(line, vec![None, None, None, Some(100.0)]);
+    }
+}