Shift loses pointer fixing #1296 (#1330)

* change resize math to absolute instead of delta

* typings

* small change for width on rotation

* apply absolute resize to other sides

* revert&change math.ts

* polish, polish, polish

* refactor with offset

* eliminate nextX

* rename to offsetPointer

* fix curved lines

* prefer arrow function

* remove unused variables/comments for now

Co-authored-by: daishi <daishi@axlight.com>

src/math.test.ts

@@ -0,0 +1,15 @@
+import { rotate } from "./math";
+
+describe("rotate", () => {
+  it("should rotate over (x2, y2) and return the rotated coordinates for (x1, y1)", () => {
+    const x1 = 10;
+    const y1 = 20;
+    const x2 = 20;
+    const y2 = 30;
+    const angle = Math.PI / 2;
+    const [rotatedX, rotatedY] = rotate(x1, y1, x2, y2, angle);
+    expect([rotatedX, rotatedY]).toEqual([30, 20]);
+    const res2 = rotate(rotatedX, rotatedY, x2, y2, -angle);
+    expect(res2).toEqual([x1, x2]);
+  });
+});