feat(desktop): P17 村民走路节奏差异化（农夫/货郎/书生 纯 tick 节奏）

1 files changed, 31 insertions, 3 deletions

diff --git a/src/LivingVillage.Desktop.Tests/PrototypeTests.fs b/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
index 25f4d02..b8f23a0 100644
--- a/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
+++ b/src/LivingVillage.Desktop.Tests/PrototypeTests.fs
@@ -335,7 +335,7 @@ type PrototypeTests () =
               SouthFacing
               WestFacing
               EastFacing ]
-        let sprites = directions |> List.map (fun direction -> npcSpriteSpec (NpcId 7) direction true 4L)
+        let sprites = directions |> List.map (fun direction -> npcSpriteSpec (NpcId 0) direction true 4L)
 
         Assert.AreEqual<NpcVisualVariant>(sameNpc, repeatedNpc)
         Assert.AreNotEqual<NpcVisualVariant>(sameNpc, otherNpc)
@@ -534,6 +534,34 @@ type PrototypeTests () =
         Assert.AreEqual<CharacterFrame>(VillageArt.characterFrame true 12L, VillageArt.characterFrame true 12L)
 
     [<TestMethod>]
+    member _.NpcTradesAndWalkRhythmsAreDistinctAndDeterministic () =
+        // Three trades repeat by id and stay stable, with no randomness.
+        Assert.AreEqual<VillageArt.NpcTrade>(VillageArt.Farmer, VillageArt.npcTrade (NpcId 0))
+        Assert.AreEqual<VillageArt.NpcTrade>(VillageArt.Peddler, VillageArt.npcTrade (NpcId 1))
+        Assert.AreEqual<VillageArt.NpcTrade>(VillageArt.Scholar, VillageArt.npcTrade (NpcId 2))
+        Assert.AreEqual<VillageArt.NpcTrade>(VillageArt.npcTrade (NpcId 9), VillageArt.npcTrade (NpcId 0))
+
+        // Distinct cadences: peddler shuffles fastest, scholar strolls slowest.
+        let farmer = VillageArt.rhythmFor VillageArt.Farmer
+        let peddler = VillageArt.rhythmFor VillageArt.Peddler
+        let scholar = VillageArt.rhythmFor VillageArt.Scholar
+        Assert.IsTrue(peddler.WalkWindow < farmer.WalkWindow && farmer.WalkWindow < scholar.WalkWindow)
+        Assert.IsTrue(peddler.IdleWindow < farmer.IdleWindow && farmer.IdleWindow < scholar.IdleWindow)
+
+        // Same tick, three trade-specific frames (at 12 ticks: Farmer IV, Peddler II, Scholar I).
+        let frameAt trade tick = VillageArt.animationFrameFor (VillageArt.rhythmFor trade) tick
+        let frames =
+            [ VillageArt.Farmer; VillageArt.Peddler; VillageArt.Scholar ]
+            |> List.map (fun trade -> frameAt trade 12L)
+        Assert.AreEqual<AnimationFrame list>([ FrameFour; FrameTwo; FrameOne ], frames)
+        Assert.AreEqual<VillageArt.WalkRhythm>(VillageArt.rhythmFor VillageArt.Scholar, VillageArt.rhythmFor VillageArt.Scholar)
+
+        // npcSpriteSpec now follows the NPC's own trade cadence.
+        Assert.AreEqual<CharacterFrame>(WalkFrame FrameFour, (VillageArt.npcSpriteSpec (NpcId 0) VillageArt.SouthFacing true 12L).Frame)
+        Assert.AreEqual<CharacterFrame>(WalkFrame FrameTwo, (VillageArt.npcSpriteSpec (NpcId 1) VillageArt.SouthFacing true 12L).Frame)
+        Assert.AreEqual<CharacterFrame>(WalkFrame FrameOne, (VillageArt.npcSpriteSpec (NpcId 2) VillageArt.SouthFacing true 12L).Frame)
+
+    [<TestMethod>]
     member _.ChimneySmokeFramesAreDeterministicAndThreePhase () =
         Assert.AreEqual<int>(0, VillageArt.smokeFrameTick 0L)
         Assert.AreEqual<int>(0, VillageArt.smokeFrameTick 39L)
@@ -658,8 +686,8 @@ type PrototypeTests () =
     member _.RuntimeMovementAndNpcTargetsProduceStableSpriteDirections () =
         let idle = VillageArt.facingAfterMovement { X = 4.0f; Y = 4.0f } { X = 4.0f; Y = 4.0f } VillageArt.EastFacing
         let moved = VillageArt.facingAfterMovement { X = 4.0f; Y = 4.0f } { X = 2.0f; Y = 4.0f } VillageArt.EastFacing
-        let targetSpec = VillageArt.npcSpriteSpecAtTarget (NpcId 7) { X = 10.0f; Y = 10.0f } { X = 10.0f; Y = 8.0f } 4L
-        let arrivedSpec = VillageArt.npcSpriteSpecAtTarget (NpcId 7) { X = 10.0f; Y = 10.0f } { X = 10.0f; Y = 10.0f } 4L
+        let targetSpec = VillageArt.npcSpriteSpecAtTarget (NpcId 0) { X = 10.0f; Y = 10.0f } { X = 10.0f; Y = 8.0f } 4L
+        let arrivedSpec = VillageArt.npcSpriteSpecAtTarget (NpcId 0) { X = 10.0f; Y = 10.0f } { X = 10.0f; Y = 10.0f } 4L
 
         Assert.AreEqual<VillageArt.FacingDirection>(VillageArt.EastFacing, idle)
         Assert.AreEqual<VillageArt.FacingDirection>(VillageArt.WestFacing, moved)