Init

src/common/Matrix2.ts

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+import { Vector2, Vector3 } from "three";
+
+export class Matrix2
+{
+    private el = [1, 0, 0, 1];
+    set(n11: number, n12: number, n21: number, n22: number)
+    {
+        let te = this.el;
+
+        te[0] = n11; te[1] = n21;
+        te[2] = n12; te[3] = n22;
+        return this;
+    }
+    applyVector(vec: Vector2 | Vector3)
+    {
+        let x = vec.x, y = vec.y;
+        let e = this.el;
+        vec.x = e[0] * x + e[2] * y;
+        vec.y = e[1] * x + e[3] * y;
+
+        return this;
+    }
+
+    setRotate(theta: number): Matrix2
+    {
+        // let el = this.el;
+        let c = Math.cos(theta), s = Math.sin(theta);
+
+        this.set(c, -s,
+            s, c);
+        return this;
+    }
+}