a bit of refactoring; importing engine into bun for server

4 files changed, 135 insertions, 0 deletions

diff --git a/engine/entities/Entity.ts b/engine/entities/Entity.ts
new file mode 100644
index 0000000..e57ccde
--- /dev/null
+++ b/engine/entities/Entity.ts
@@ -0,0 +1,33 @@
+import type { Component } from "../components";
+import { ComponentNotFoundError } from "../exceptions";
+
+export abstract class Entity {
+  private static ID = 0;
+
+  public readonly id: number;
+  public readonly components: Map<string, Component>;
+
+  constructor() {
+    this.id = Entity.ID++;
+    this.components = new Map();
+  }
+
+  public addComponent(component: Component) {
+    this.components.set(component.name, component);
+  }
+
+  public getComponent<T extends Component>(name: string): T {
+    if (!this.hasComponent(name)) {
+      throw new Error("Entity does not have component " + name);
+    }
+    return this.components.get(name) as T;
+  }
+
+  public getComponents(): Component[] {
+    return Array.from(this.components.values());
+  }
+
+  public hasComponent(name: string): boolean {
+    return this.components.has(name);
+  }
+}
diff --git a/engine/entities/Floor.ts b/engine/entities/Floor.ts
new file mode 100644
index 0000000..d51badc
--- /dev/null
+++ b/engine/entities/Floor.ts
@@ -0,0 +1,31 @@
+import { IMAGES, SPRITE_SPECS, Sprites, type SpriteSpec } from "../config";
+import { BoundingBox, Sprite } from "../components";
+import { TopCollidable } from "../components/TopCollidable";
+import { Entity } from "../entities";
+
+export class Floor extends Entity {
+  private static spriteSpec: SpriteSpec = SPRITE_SPECS.get(Sprites.FLOOR);
+
+  constructor(width: number) {
+    super();
+
+    this.addComponent(
+      new Sprite(
+        IMAGES.get(Floor.spriteSpec.states[width].sheet),
+        { x: 0, y: 0 },
+        { width, height: Floor.spriteSpec.height },
+        Floor.spriteSpec.msPerFrame,
+        Floor.spriteSpec.frames
+      )
+    );
+
+    this.addComponent(
+      new BoundingBox(
+        { x: 300, y: 300 },
+        { width, height: Floor.spriteSpec.height }
+      )
+    );
+
+    this.addComponent(new TopCollidable());
+  }
+}
diff --git a/engine/entities/Player.ts b/engine/entities/Player.ts
new file mode 100644
index 0000000..0ba5a41
--- /dev/null
+++ b/engine/entities/Player.ts
@@ -0,0 +1,68 @@
+import { Entity } from ".";
+import { IMAGES, SPRITE_SPECS, Sprites, type SpriteSpec } from "../config";
+import {
+  Jump,
+  FacingDirection,
+  BoundingBox,
+  Sprite,
+  Velocity,
+  Gravity,
+  WallBounded,
+  Forces,
+  Collide,
+  Control,
+  Mass,
+  Moment,
+} from "../components";
+import { PhysicsConstants } from "../config";
+import { Direction } from "../interfaces";
+
+export class Player extends Entity {
+  private static MASS: number = 10;
+  private static MOI: number = 1000;
+
+  private static spriteSpec: SpriteSpec = SPRITE_SPECS.get(Sprites.COFFEE);
+
+  constructor() {
+    super();
+
+    this.addComponent(
+      new BoundingBox(
+        { x: 300, y: 100 },
+        { width: Player.spriteSpec.width, height: Player.spriteSpec.height },
+        0
+      )
+    );
+
+    this.addComponent(new Velocity({ dx: 0, dy: 0 }, 0));
+
+    this.addComponent(new Mass(Player.MASS));
+    this.addComponent(new Moment(Player.MOI));
+    this.addComponent(new Forces());
+    this.addComponent(new Gravity());
+
+    this.addComponent(new Jump());
+    this.addComponent(new Control());
+
+    this.addComponent(new Collide());
+    this.addComponent(new WallBounded());
+
+    this.addFacingDirectionComponents();
+  }
+
+  private addFacingDirectionComponents() {
+    const [leftSprite, rightSprite] = [Direction.LEFT, Direction.RIGHT].map(
+      (direction) =>
+        new Sprite(
+          IMAGES.get(Player.spriteSpec.states[direction].sheet),
+          { x: 0, y: 0 },
+          { width: Player.spriteSpec.width, height: Player.spriteSpec.height },
+          Player.spriteSpec.msPerFrame,
+          Player.spriteSpec.frames
+        )
+    );
+
+    this.addComponent(new FacingDirection(leftSprite, rightSprite));
+    this.addComponent(leftSprite); // face Left by default
+  }
+}
diff --git a/engine/entities/index.ts b/engine/entities/index.ts
new file mode 100644
index 0000000..a921512
--- /dev/null
+++ b/engine/entities/index.ts
@@ -0,0 +1,3 @@
+export * from "./Entity";
+export * from "./Floor";
+export * from "./Player";