From 72c6c7de12e9833f52bf2d0718d70f044f8ab57e Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <elizabeth.hunt@simponic.xyz>
Date: Thu, 20 Jul 2023 20:47:32 -0700
Subject: a bit of refactoring; importing engine into bun for server

---
 client/lib/systems/Physics.ts | 94 -------------------------------------------
 1 file changed, 94 deletions(-)
 delete mode 100644 client/lib/systems/Physics.ts

(limited to 'client/lib/systems/Physics.ts')

diff --git a/client/lib/systems/Physics.ts b/client/lib/systems/Physics.ts
deleted file mode 100644
index 319ae29..0000000
--- a/client/lib/systems/Physics.ts
+++ /dev/null
@@ -1,94 +0,0 @@
-import { System, SystemNames } from ".";
-import {
-  Acceleration,
-  BoundingBox,
-  ComponentNames,
-  Forces,
-  Gravity,
-  Velocity,
-  Mass,
-  Jump,
-} from "../components";
-import { PhysicsConstants } from "../config";
-import type { Entity } from "../entities";
-import type { Force2D } from "../interfaces";
-
-export class Physics extends System {
-  constructor() {
-    super(SystemNames.Physics);
-  }
-
-  public update(
-    dt: number,
-    entityMap: Map<number, Entity>,
-    componentEntities: Map<string, Set<number>>
-  ): void {
-    componentEntities.get(ComponentNames.Forces)?.forEach((entityId) => {
-      const entity = entityMap.get(entityId);
-
-      const mass = entity.getComponent<Mass>(ComponentNames.Mass).mass;
-      const forces = entity.getComponent<Forces>(ComponentNames.Forces).forces;
-      const velocity = entity.getComponent<Velocity>(ComponentNames.Velocity);
-      const inertia = entity.getComponent<Moment>(
-        ComponentNames.Moment
-      ).inertia;
-
-      // F_g = mg, applied only until terminal velocity is reached
-      if (entity.hasComponent(ComponentNames.Gravity)) {
-        const gravity = entity.getComponent<Gravity>(ComponentNames.Gravity);
-        if (velocity.dCartesian.dy <= gravity.terminalVelocity) {
-          forces.push({
-            fCartesian: {
-              fy: mass * PhysicsConstants.GRAVITY,
-            },
-          });
-        }
-      }
-
-      // ma = Σ(F), Iα = Σ(T)
-      const sumOfForces = forces.reduce(
-        (accum: Force2D, { fCartesian, torque }: Force2D) => ({
-          fCartesian: {
-            fx: accum.fCartesian.fx + (fCartesian?.fx ?? 0),
-            fy: accum.fCartesian.fy + (fCartesian?.fy ?? 0),
-          },
-          torque: accum.torque + (torque ?? 0),
-        }),
-        { fCartesian: { fx: 0, fy: 0 }, torque: 0 }
-      );
-
-      // integrate accelerations
-      const [ddy, ddx] = [
-        sumOfForces.fCartesian.fy,
-        sumOfForces.fCartesian.fx,
-      ].map((x) => x / mass);
-      velocity.dCartesian.dx += ddx * dt;
-      velocity.dCartesian.dy += ddy * dt;
-      velocity.dTheta += (sumOfForces.torque * dt) / inertia;
-      // clear the forces
-      entity.getComponent<Forces>(ComponentNames.Forces).forces = [];
-
-      // maybe we fell off the floor
-      if (ddy > 0 && entity.hasComponent(ComponentNames.Jump)) {
-        entity.getComponent<Jump>(ComponentNames.Jump).canJump = false;
-      }
-    });
-
-    componentEntities.get(ComponentNames.Velocity)?.forEach((entityId) => {
-      const entity = entityMap.get(entityId);
-      const velocity = entity.getComponent<Velocity>(ComponentNames.Velocity);
-      const boundingBox = entity.getComponent<BoundingBox>(
-        ComponentNames.BoundingBox
-      );
-
-      // integrate velocity
-      boundingBox.center.x += velocity.dCartesian.dx * dt;
-      boundingBox.center.y += velocity.dCartesian.dy * dt;
-      boundingBox.rotation += velocity.dTheta * dt;
-      boundingBox.rotation =
-        (boundingBox.rotation < 0
-          ? 360 + boundingBox.rotation
-          : boundingBox.rotation) % 360;
-    });
-  }
-}
-- 
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