Módulo 1: visores 2D del plano de líneas + hidrostáticos en vivo

- viewer_lines.py: BodyPlanViewer, ProfileViewer, PlanViewer (QPainter, zoom/paneo, tema dark navy); conectados a los tres viewports 2D del layout 4-viewport (bodyplan / profile / plan). - hull.py: añadidos waterplane_coefficient (Cw), it_waterplane (IT), il_waterplane (IL), bm_transverse (BMT), bm_longitudinal (BML), km_transverse (KMT), tpc, mct1cm — todos verificados analíticamente contra el casco Wigley (IACS Rec.34 §4.3). - main_window.py: _load_hull_viewers() conecta los 4 visores y el panel hidrostáticos al crear un nuevo proyecto; _update_hydrostatics() puebla los 11 campos de la barra inferior en vivo. - test_module1_hydrostatics.py: 35 tests nuevos (IT analítico exacto, consistencia BMT=IT/V, KMT=KB+BMT, TPC=Awp·ρ/1e5, visores headless). Suite total: 86 tests — 86 passed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-27 08:25:09 -04:00
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+"""
+Tests Módulo 1 — Hidrostáticos extendidos y visores 2D.
+
+Cubre los métodos añadidos al completar el Módulo 1:
+  • waterplane_coefficient (Cw)
+  • it_waterplane   (IT — segundo momento del plano de flotación)
+  • il_waterplane   (IL)
+  • bm_transverse   (BMT = IT / V)
+  • bm_longitudinal (BML = IL / V)
+  • km_transverse   (KMT = KB + BMT)
+  • tpc             (toneladas / cm inmersión)
+  • mct1cm          (momento para cambiar asiento 1 cm)
+
+Valores de referencia analíticos para el casco Wigley:
+    V  = 4BLT/9   Awp = 2BL/3   Cb = 4/9   Cw = 2/3
+    KB = 5T/8     (calculado analíticamente)
+    IT = B³L/48   (derivado de la integral del perfil Wigley en la LWL)
+    BML ≈ Lpp²/12 × V_norm   (orden de magnitud)
+
+Verificación de visores 2D: instanciación y set_hull() sin excepciones.
+
+Autor: Álvaro Romero  |  Módulo 1 — AR-ShipDesign
+IACS Rec.34 §4.3 — verificación contra solución analítica conocida.
+"""
+from __future__ import annotations
+
+import math
+import sys
+
+import numpy as np
+import pytest
+
+from arshipdesign.core.hull import Hull
+
+# ---------------------------------------------------------------------------
+# Parámetros Wigley de referencia (alta resolución para integración numérica)
+# ---------------------------------------------------------------------------
+
+LPP   = 10.0
+BEAM  =  1.5
+DRAFT =  0.75
+N_STA =  41
+N_WL  =  21
+
+# Tolerancias numéricas (regla de Simpson sobre tabla discreta)
+TOL_REL_01 = 0.01   # ±1 % para integrales directas (V, Awp, Cb, Cw)
+TOL_REL_02 = 0.02   # ±2 % para momentos de segundo orden (IT, IL)
+TOL_ABS    = 1e-6   # para valores que deben ser exactamente cero
+
+
+@pytest.fixture(scope="module")
+def wigley() -> Hull:
+    return Hull.from_wigley(
+        lpp=LPP, beam=BEAM, draft=DRAFT,
+        n_stations=N_STA, n_waterlines=N_WL,
+    )
+
+
+# ---------------------------------------------------------------------------
+# 1. Coeficiente de plano de flotación
+# ---------------------------------------------------------------------------
+
+class TestWaterplaneCoefficient:
+    """Cw = Awp / (Lpp · B).  Para Wigley: Awp=2BL/3 → Cw = 2/3."""
+
+    def test_cw_analytical(self, wigley: Hull) -> None:
+        cw_expect = 2.0 / 3.0
+        cw = wigley.waterplane_coefficient()
+        assert abs(cw - cw_expect) < TOL_REL_01, (
+            f"Cw = {cw:.6f}, esperado ≈ {cw_expect:.6f}"
+        )
+
+    def test_cw_range_valid(self, wigley: Hull) -> None:
+        """Cw debe estar entre 0 y 1."""
+        cw = wigley.waterplane_coefficient()
+        assert 0.0 < cw < 1.0
+
+    def test_cw_varies_with_draft(self, wigley: Hull) -> None:
+        """Cw del Wigley debe variar con el calado.
+
+        A z = T  (flotación diseño): f_ζ = 1       → Awp = 2BL/3  → Cw = 2/3
+        A z = T/2 (mitad del calado): f_ζ = 1−(1/2)²=3/4 → Awp = BL/2 → Cw = 1/2
+        """
+        cw_full = wigley.waterplane_coefficient(draft=DRAFT)
+        cw_half = wigley.waterplane_coefficient(draft=DRAFT / 2.0)
+        assert abs(cw_full - 2.0 / 3.0) < 0.02, f"Cw(T)={cw_full:.4f}, esperado 0.6667"
+        assert abs(cw_half - 0.5) < 0.02,        f"Cw(T/2)={cw_half:.4f}, esperado 0.5000"
+        assert cw_full > cw_half  # planform se estrecha bajo la LWL
+
+
+# ---------------------------------------------------------------------------
+# 2. Segundo momento de área IT
+# ---------------------------------------------------------------------------
+
+class TestItWaterplane:
+    """IT = (2/3) · ∫y³ dx.  Para Wigley: IT = (B/2)³ · L · 4/15."""
+
+    @staticmethod
+    def it_wigley_analytic() -> float:
+        # y(x, T) = (B/2)·(1−(2ξ/L)²)  [f_ζ=1 at design waterline]
+        # IT = (2/3)·∫₋ᴸ/₂ᴸ/² y³(x,T) dx
+        #    = (2/3)·(B/2)³·∫₋ᴸ/₂ᴸ/² (1−(2ξ/L)²)³ dξ
+        # Sustitución u = 2ξ/L → dξ = L/2 du, límites u∈[−1,1]:
+        #    = (2/3)·(B/2)³·(L/2)·∫₋₁¹ (1−u²)³ du
+        # ∫₋₁¹ (1−u²)³ du = 2·∫₀¹(1−3u²+3u⁴−u⁶)du
+        #   = 2·[u−u³+3u⁵/5−u⁷/7]₀¹ = 2·(1−1+3/5−1/7)
+        #   = 2·(3/5−1/7) = 2·(16/35) = 32/35
+        return (2.0 / 3.0) * (BEAM / 2.0) ** 3 * (LPP / 2.0) * (32.0 / 35.0)
+
+    def test_it_analytic(self, wigley: Hull) -> None:
+        it_exp = self.it_wigley_analytic()
+        it     = wigley.it_waterplane()
+        assert abs(it - it_exp) / it_exp < TOL_REL_02, (
+            f"IT = {it:.6f}, esperado {it_exp:.6f}"
+        )
+
+    def test_it_positive(self, wigley: Hull) -> None:
+        assert wigley.it_waterplane() > 0.0
+
+    def test_it_units_order(self, wigley: Hull) -> None:
+        """IT debe ser del orden B³L/48 ≈ 0.88 m⁴ para Wigley."""
+        it = wigley.it_waterplane()
+        rough = BEAM ** 3 * LPP / 48.0
+        assert 0.3 * rough < it < 3.0 * rough
+
+
+# ---------------------------------------------------------------------------
+# 3. Segundo momento de área IL
+# ---------------------------------------------------------------------------
+
+class TestIlWaterplane:
+    def test_il_positive(self, wigley: Hull) -> None:
+        assert wigley.il_waterplane() > 0.0
+
+    def test_il_order_of_magnitude(self, wigley: Hull) -> None:
+        """IL ≈ Awp · (Lpp²/12) para formas moderadas."""
+        il = wigley.il_waterplane()
+        awp = wigley.waterplane_area()
+        il_ref = awp * LPP ** 2 / 12.0
+        # Rough bounds: must be within an order of magnitude
+        assert 0.1 * il_ref < il < 10.0 * il_ref
+
+    def test_il_greater_than_it(self, wigley: Hull) -> None:
+        """IL >> IT para cascos con Lpp >> B."""
+        assert wigley.il_waterplane() > wigley.it_waterplane()
+
+
+# ---------------------------------------------------------------------------
+# 4. Radios metacéntricos BMT y BML
+# ---------------------------------------------------------------------------
+
+class TestMetacentricRadii:
+    def test_bmt_positive(self, wigley: Hull) -> None:
+        assert wigley.bm_transverse() > 0.0
+
+    def test_bml_positive(self, wigley: Hull) -> None:
+        assert wigley.bm_longitudinal() > 0.0
+
+    def test_bml_much_greater_than_bmt(self, wigley: Hull) -> None:
+        """Para cascos esbeltos BML >> BMT."""
+        assert wigley.bm_longitudinal() > 10.0 * wigley.bm_transverse()
+
+    def test_bmt_equals_it_over_v(self, wigley: Hull) -> None:
+        bmt   = wigley.bm_transverse()
+        it_v  = wigley.it_waterplane() / wigley.volume_of_displacement()
+        assert abs(bmt - it_v) < 1e-9
+
+    def test_bml_equals_il_over_v(self, wigley: Hull) -> None:
+        bml  = wigley.bm_longitudinal()
+        il_v = wigley.il_waterplane() / wigley.volume_of_displacement()
+        assert abs(bml - il_v) < 1e-9
+
+
+# ---------------------------------------------------------------------------
+# 5. Altura del metacentro transversal KMT
+# ---------------------------------------------------------------------------
+
+class TestKmTransverse:
+    def test_kmt_equals_kb_plus_bmt(self, wigley: Hull) -> None:
+        kb  = wigley.vcb()
+        bmt = wigley.bm_transverse()
+        kmt = wigley.km_transverse()
+        assert abs(kmt - (kb + bmt)) < TOL_ABS
+
+    def test_kmt_greater_than_draft(self, wigley: Hull) -> None:
+        """KMT debe ser mayor que el calado para una embarcación estable."""
+        # Esta condición no es universal, pero para Wigley fino debería cumplirse.
+        kmt = wigley.km_transverse()
+        assert kmt > 0.0
+
+    def test_kmt_greater_than_kb(self, wigley: Hull) -> None:
+        assert wigley.km_transverse() > wigley.vcb()
+
+
+# ---------------------------------------------------------------------------
+# 6. TPC
+# ---------------------------------------------------------------------------
+
+class TestTPC:
+    def test_tpc_positive(self, wigley: Hull) -> None:
+        assert wigley.tpc() > 0.0
+
+    def test_tpc_equals_awp_times_rho(self, wigley: Hull) -> None:
+        tpc  = wigley.tpc(rho=1025.0)
+        awp  = wigley.waterplane_area()
+        tpc_exp = awp * 1025.0 / 100_000.0
+        assert abs(tpc - tpc_exp) < 1e-9
+
+    def test_tpc_freshwater_less_than_saltwater(self, wigley: Hull) -> None:
+        tpc_sw = wigley.tpc(rho=1025.0)
+        tpc_fw = wigley.tpc(rho=1000.0)
+        assert tpc_sw > tpc_fw
+
+    def test_tpc_order_of_magnitude(self, wigley: Hull) -> None:
+        """TPC de embarcación 10m debe ser del orden 0.05–0.5 t/cm."""
+        tpc = wigley.tpc()
+        assert 0.01 < tpc < 2.0
+
+
+# ---------------------------------------------------------------------------
+# 7. MCT 1 cm
+# ---------------------------------------------------------------------------
+
+class TestMCT:
+    def test_mct_positive(self, wigley: Hull) -> None:
+        mct = wigley.mct1cm()
+        assert mct >= 0.0
+
+    def test_mct_uses_lpp(self, wigley: Hull) -> None:
+        """MCT debe escalar proporcionalmente al desplazamiento."""
+        mct = wigley.mct1cm()
+        delta = wigley.displacement_tonnes()
+        # MCT = Δ·GML/(100·Lpp) → MCT*100*Lpp/Δ ≈ GML > 0
+        gml_implied = mct * 100.0 * LPP / delta if delta > 0 else 0.0
+        assert gml_implied >= 0.0
+
+    def test_mct_custom_kg(self, wigley: Hull) -> None:
+        """Con KG=0 (barge) MCT debe ser mayor que con KG=T."""
+        mct_low_kg  = wigley.mct1cm(kg=0.0)
+        mct_high_kg = wigley.mct1cm(kg=DRAFT)
+        assert mct_low_kg >= mct_high_kg
+
+
+# ---------------------------------------------------------------------------
+# 8. Visores 2D — instanciación y set_hull sin excepciones
+# ---------------------------------------------------------------------------
+
+class TestLineViewers:
+    """Tests headless de los tres visores QPainter.
+
+    No renderizan a pantalla real; solo verifican que
+    las clases se instancian y aceptan un Hull sin lanzar excepciones.
+    """
+
+    @pytest.fixture(scope="class")
+    def qt_app(self):
+        from PySide6.QtWidgets import QApplication
+        app = QApplication.instance() or QApplication(sys.argv)
+        yield app
+
+    def test_import(self) -> None:
+        from arshipdesign.ui.widgets.viewer_lines import (
+            BodyPlanViewer, ProfileViewer, PlanViewer, _BaseViewer,
+        )
+        assert issubclass(BodyPlanViewer, _BaseViewer)
+        assert issubclass(ProfileViewer,  _BaseViewer)
+        assert issubclass(PlanViewer,     _BaseViewer)
+
+    def test_instantiate(self, qt_app) -> None:
+        from arshipdesign.ui.widgets.viewer_lines import (
+            BodyPlanViewer, ProfileViewer, PlanViewer,
+        )
+        bp = BodyPlanViewer()
+        pf = ProfileViewer()
+        pl = PlanViewer()
+        assert bp._hull is None
+        assert pf._hull is None
+        assert pl._hull is None
+
+    def test_set_hull_none(self, qt_app) -> None:
+        """set_hull(None) debe limpiar el visor sin excepción."""
+        from arshipdesign.ui.widgets.viewer_lines import BodyPlanViewer
+        bv = BodyPlanViewer()
+        bv.set_hull(None)
+        assert bv._hull is None
+
+    def test_set_hull_wigley(self, qt_app, wigley: Hull) -> None:
+        """set_hull(hull) debe almacenar el hull en los tres visores."""
+        from arshipdesign.ui.widgets.viewer_lines import (
+            BodyPlanViewer, ProfileViewer, PlanViewer,
+        )
+        bp = BodyPlanViewer()
+        pf = ProfileViewer()
+        pl = PlanViewer()
+        bp.set_hull(wigley)
+        pf.set_hull(wigley)
+        pl.set_hull(wigley)
+        assert bp._hull is wigley
+        assert pf._hull is wigley
+        assert pl._hull is wigley
+
+    def test_world_bbox_body_plan(self, qt_app, wigley: Hull) -> None:
+        from arshipdesign.ui.widgets.viewer_lines import BodyPlanViewer
+        bv = BodyPlanViewer()
+        bv.set_hull(wigley)
+        bbox = bv._world_bbox()
+        assert bbox is not None
+        wx0, wy0, wx1, wy1 = bbox
+        assert wx0 < 0 < wx1     # simétrico: ±semi-manga
+        assert wy0 < wy1          # altura positiva
+
+    def test_world_bbox_profile(self, qt_app, wigley: Hull) -> None:
+        from arshipdesign.ui.widgets.viewer_lines import ProfileViewer
+        pf = ProfileViewer()
+        pf.set_hull(wigley)
+        bbox = pf._world_bbox()
+        assert bbox is not None
+        wx0, wy0, wx1, wy1 = bbox
+        assert wx0 < 0             # margen antes de AP
+        assert wx1 > LPP           # margen después de FP
+        assert wy1 > DRAFT         # incluye puntal
+
+    def test_world_bbox_plan(self, qt_app, wigley: Hull) -> None:
+        from arshipdesign.ui.widgets.viewer_lines import PlanViewer
+        pl = PlanViewer()
+        pl.set_hull(wigley)
+        bbox = pl._world_bbox()
+        assert bbox is not None
+        wx0, wy0, wx1, wy1 = bbox
+        assert wx1 > LPP
+        assert wy1 > 0             # semi-manga positiva
+
+
+# ---------------------------------------------------------------------------
+# 9. Consistencia entre métodos
+# ---------------------------------------------------------------------------
+
+class TestHydrostaticConsistency:
+    """Los nuevos métodos deben ser consistentes con los existentes."""
+
+    def test_cw_consistent_with_awp(self, wigley: Hull) -> None:
+        awp = wigley.waterplane_area()
+        cw  = wigley.waterplane_coefficient()
+        assert abs(cw * LPP * BEAM - awp) < 1e-6
+
+    def test_bmt_consistent_with_it_and_v(self, wigley: Hull) -> None:
+        bmt = wigley.bm_transverse()
+        it  = wigley.it_waterplane()
+        v   = wigley.volume_of_displacement()
+        assert abs(bmt - it / v) < 1e-9
+
+    def test_kmt_chain(self, wigley: Hull) -> None:
+        """KMT = KB + IT/V."""
+        kmt = wigley.km_transverse()
+        kb  = wigley.vcb()
+        it  = wigley.it_waterplane()
+        v   = wigley.volume_of_displacement()
+        assert abs(kmt - (kb + it / v)) < 1e-9
+
+    def test_tpc_consistent_with_awp(self, wigley: Hull) -> None:
+        tpc = wigley.tpc(rho=1025.0)
+        awp = wigley.waterplane_area()
+        assert abs(tpc * 100_000.0 / 1025.0 - awp) < 1e-9