Create calculate_arm_angles.py

stuff_model/calculate_arm_angles.py

@@ -0,0 +1,62 @@
+import polars as pl
+import numpy as np
+import requests
+
+def calculate_arm_angles(df: pl.DataFrame,pitcher_id:int) -> pl.DataFrame:
+    df_arm_angle = pl.read_csv('stuff_model/pitcher_arm_angles_2024.csv')
+    #pitcher_id = 489446
+    df_filter = df.filter(pl.col("pitcher_id") == pitcher_id)
+    # data = requests.get(f'https://statsapi.mlb.com/api/v1/people?personIds={pitcher_id}').json()
+
+    if pitcher_id not in df_arm_angle["pitcher"]:
+
+        data = requests.get(f'https://statsapi.mlb.com/api/v1/people?personIds={pitcher_id}').json()
+        height_in = data['people'][0]['height']
+        height = int(height_in.split("'")[0]) * 12 + int(height_in.split("'")[1].split('"')[0])
+        df_filter = (df_filter.with_columns(
+                (pl.col("release_pos_x") * 12).alias("release_pos_x"),
+                (pl.col("release_pos_z") * 12).alias("release_pos_z"),
+                (pl.lit(height * 0.70)).alias("shoulder_pos"),
+            )
+            .with_columns(
+                (pl.col("release_pos_z") - pl.col("shoulder_pos")).alias("Opp"),
+                pl.col("release_pos_x").abs().alias("Adj"),
+            )
+            .with_columns(
+                pl.struct(["Opp", "Adj"]).map_elements(lambda x: np.arctan2(x["Opp"], x["Adj"])).alias("arm_angle_rad")
+            ))
+
+        df_filter = (df_filter.with_columns(    
+            
+                pl.col("arm_angle_rad").degrees().alias("arm_angle")
+            
+            #.drop(["Opp", "arm_angle_rad"])
+            ))
+            
+    else:
+        shoulder_x = df_arm_angle.filter(pl.col("pitcher") == pitcher_id)["relative_shoulder_x"][0]
+        shoulder_z = df_arm_angle.filter(pl.col("pitcher") == pitcher_id)["shoulder_z"][0]
+
+        print(shoulder_x, shoulder_z)
+
+        df_filter = (df_filter.with_columns(
+
+            )
+            .with_columns(
+                (pl.col("release_pos_z") - shoulder_z).alias("Opp"),
+                (pl.col("release_pos_x") - shoulder_x).alias("Adj"),
+            )
+            .with_columns(
+                pl.struct(["Opp", "Adj"]).map_elements(lambda x: np.arctan2(x["Opp"], x["Adj"])).alias("arm_angle_rad")
+            )
+            .with_columns(
+                pl.col("arm_angle_rad").degrees().alias("arm_angle")
+            )
+            #.drop(["Opp", "arm_angle_rad"])
+            )
+    
+
+
+    
+    return df_filter
+