add path-2d

workspaces/tools/deno.json

@@ -1,5 +1,5 @@
 {
     "name": "@g43/tools",
-    "version": "0.0.1",
+    "version": "0.0.2",
     "exports": "./src/index.ts"
 }

workspaces/tools/src/index.ts

@@ -1 +1,2 @@
 export * from "./g-map.ts";
+export * from "./path-2d.ts";

workspaces/tools/src/path-2d.ts

@@ -0,0 +1,33 @@
+import type { ReadonlySimpleVector2 } from "@g43/types";
+
+export class Path2D<T extends ReadonlySimpleVector2> {
+    public constructor(protected readonly points: readonly T[]) {
+        if (points.length < 2) {
+            throw new Error("Cannot create path with less than 2 points");
+        }
+    }
+
+    public getFirstN(count: number): readonly ReadonlySimpleVector2[] {
+        return this.points.slice(0, count);
+    }
+
+    public getLastN(count: number): readonly ReadonlySimpleVector2[] {
+        return this.points.slice(this.points.length - count, this.points.length);
+    }
+
+    public get length(): number {
+        return this.points.length;
+    }
+
+    public get first(): T {
+        return this.points[0];
+    }
+
+    public get last(): T {
+        return this.points[this.points.length - 1];
+    }
+
+    public getPoint(index: number): T {
+        return this.points[index];
+    }
+}