From df1e17abc1fa5624fdb60dc058bdefd3ab3a19df Mon Sep 17 00:00:00 2001
From: Luke Pighetti <lukepighetti@gmail.com>
Date: Sun, 31 Aug 2025 11:25:59 -0400
Subject: [PATCH] add basic hornady table unit test

---
 test/trajectory_test.dart | 123 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 test/trajectory_test.dart

diff --git a/test/trajectory_test.dart b/test/trajectory_test.dart
new file mode 100644
index 0000000..2334a08
--- /dev/null
+++ b/test/trajectory_test.dart
@@ -0,0 +1,123 @@
+import 'package:test/test.dart';
+import 'package:ballistic/ballistic.dart';
+
+main() {
+  // using https://www.hornady.com/4dof set to BC Calculator as reference
+
+  group('Trajectory', () {
+    test("G1 M193", () {
+      checkHornadyTable(
+        createHornadyTable(
+          dragFunction: DragTableId.g1,
+          ballisticCoefficient: 0.243,
+          bulletWeightGrains: 55,
+          muzzleVelocityFps: 3240,
+          barrelTwistInchRev: 7,
+          boreDiameterInch: 0.217,
+          sightHeightInch: 1.5,
+          zeroRangeYard: 100,
+          windSpeedMph: 10,
+          windAngleDegrees: 90,
+          altitudeFeet: 0,
+          pressureInHg: 29.92,
+          temperatureF: 59,
+          humidityPct: 50,
+          shootingAngleDegrees: 0,
+          maxRangeYards: 500,
+          intervalYards: 100,
+        ),
+        [
+          (0, -1.5, 0),
+          (100, 0, -1.1),
+          (200, -2.9, -4.9),
+          (300, -11.5, -11.8),
+          (400, -28.1, -22.6),
+          (500, -55.6, -38.3),
+        ],
+      );
+    });
+  });
+}
+
+List<TrajectoryData> createHornadyTable({
+  required DragTableId dragFunction,
+  required double ballisticCoefficient,
+  required double bulletWeightGrains,
+  required double muzzleVelocityFps,
+  required double barrelTwistInchRev,
+  required double boreDiameterInch,
+  required double sightHeightInch,
+  required double zeroRangeYard,
+  required double windSpeedMph,
+  required double windAngleDegrees,
+  required double altitudeFeet,
+  required double pressureInHg,
+  required double temperatureF,
+  required double humidityPct,
+  required double shootingAngleDegrees,
+  required double maxRangeYards,
+  required double intervalYards,
+}) {
+  assert(humidityPct >= 0 && humidityPct <= 100);
+
+  final bc = createBallisticCoefficient(ballisticCoefficient, dragFunction);
+  final bullet = Projectile.withoutDimensions(
+      bc, Weight(bulletWeightGrains, WeightUnit.grain));
+  final ammo = Ammunition.create(
+    bullet,
+    Velocity(muzzleVelocityFps, VelocityUnit.fps),
+  );
+
+  final atmosphere = Atmosphere.createAtmosphere(
+    Distance(altitudeFeet, DistanceUnit.foot),
+    Pressure(pressureInHg, PressureUnit.inHgg),
+    Temperature(temperatureF, TemperatureUnit.fahrenheit),
+    humidityPct,
+  );
+
+  final weapon = Weapon.createWeaponWithTwist(
+    Distance(sightHeightInch, DistanceUnit.inch),
+    ZeroInfo.createZeroInfo(Distance(zeroRangeYard, DistanceUnit.yard)),
+    TwistInfo.createTwist(
+      TwistDirection.right,
+      Distance(barrelTwistInchRev, DistanceUnit.inch),
+    ),
+  );
+
+  final calculator = TrajectoryCalculator.create();
+  final sightAngle = calculator.sightAngle(ammo, weapon, atmosphere);
+
+  final shotParams = ShotParameters.createShotParameters(
+    sightAngle,
+    Distance(maxRangeYards, DistanceUnit.yard),
+    Distance(intervalYards, DistanceUnit.yard),
+  );
+
+  final windList = createOnlyWindInfo(
+    Velocity(windSpeedMph, VelocityUnit.mph),
+    Angular(-windAngleDegrees, AngularUnit.degree),
+  );
+
+  return calculator.trajectory(
+    ammo,
+    weapon,
+    atmosphere,
+    shotParams,
+    windList,
+  );
+}
+
+void checkHornadyTable(List<TrajectoryData> trajectory,
+    List<(double yards, double drop, double drift)> table) {
+  expect(trajectory.length, table.length);
+  for (final (i, d) in trajectory.indexed) {
+    final data = d;
+    final (rangeYards, dropInches, driftInches) = table[i];
+    final targetRange = Distance(rangeYards, DistanceUnit.yard);
+    final targetDrop = Distance(dropInches, DistanceUnit.inch);
+    final targetDrift = Distance(driftInches, DistanceUnit.inch);
+    expect(data.travelDistance.value, closeTo(targetRange.value, 36));
+    expect(data.drop.value, closeTo(targetDrop.value, 0.1));
+    expect(data.windage.value, closeTo(targetDrift.value, 0.1));
+  }
+}