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| /* global describe, expect, it */
|
| import { interpolateProp, normalizeAngle } from "../props";
|
| describe("normalizeAngle", () => {
| it("returns the same value for angle in the interval (-180; 180]", () => {
| expect(normalizeAngle(-179.8)).toBe(-179.8);
| expect(normalizeAngle(-42)).toBe(-42);
| expect(normalizeAngle(0)).toBe(0);
| expect(normalizeAngle(90)).toBe(90);
| expect(normalizeAngle(180)).toBe(180);
| });
| it("projects angles from the intervals [-360;-180] and (180;360] onto the interval (-180; 180]", () => {
| expect(normalizeAngle(-360)).toBe(0);
| expect(normalizeAngle(-181)).toBe(179);
| expect(normalizeAngle(220)).toBe(-140);
| expect(normalizeAngle(359)).toBe(-1);
| });
| });
|
| describe("interpolateProp", () => {
| it("returns the exact value from the object containing the given frame", () => {
| const objA = {
| x: 0,
| y: -50,
| size: 100,
| frame: 1,
| };
| const objB = {
| x: 700,
| y: -500,
| size: 1,
| frame: 100,
| };
|
| for (const prop of Object.keys(objA)) {
| expect(interpolateProp(objA, objB, objA.frame, prop)).toBe(objA[prop]);
| expect(interpolateProp(objA, objB, objB.frame, prop)).toBe(objB[prop]);
| }
| });
| it("linearly interpolates numeric properties between frames", () => {
| const objA = {
| x: -10,
| y: -50,
| size: 3,
| frame: 0,
| };
| const objB = {
| x: 10,
| y: -500,
| size: 4,
| frame: 100,
| };
|
| expect(interpolateProp(objA, objB, 25, "x")).toBe(-5);
| expect(interpolateProp(objA, objB, 50, "x")).toBe(0);
| expect(interpolateProp(objA, objB, 75, "x")).toBe(5);
| expect(interpolateProp(objA, objB, 8, "y")).toBe(-86);
| expect(interpolateProp(objA, objB, 30, "y")).toBe(-185);
| expect(interpolateProp(objA, objB, 72, "y")).toBe(-374);
| expect(interpolateProp(objA, objB, 50, "size")).toBe(3.5);
| expect(interpolateProp(objA, objB, 88, "size")).toBe(3.88);
| expect(interpolateProp(objA, objB, 3, "size")).toBe(3.03);
| });
| it("linearly interpolates rotation in the shortest way", () => {
| const objA = {
| rotation: -170,
| frame: 0,
| };
| const objB = {
| rotation: 170,
| frame: 20,
| };
|
| expect(interpolateProp(objA, objB, 0, "rotation")).toBe(-170);
| expect(interpolateProp(objA, objB, 5, "rotation")).toBe(-175);
| expect(interpolateProp(objA, objB, 10, "rotation")).toBe(180);
| expect(interpolateProp(objA, objB, 15, "rotation")).toBe(175);
| expect(interpolateProp(objA, objB, 20, "rotation")).toBe(170);
|
| expect(interpolateProp(objB, objA, 15, "rotation")).toBe(175);
|
| const objE = {
| rotation: 180,
| frame: 0,
| };
| const objN = {
| rotation: 90,
| frame: 10,
| };
| const objW = {
| rotation: 0,
| frame: 20,
| };
| const objS = {
| rotation: -90,
| frame: 30,
| };
|
| expect(interpolateProp(objE, objN, 5, "rotation")).toBe(135);
| expect(interpolateProp(objN, objW, 15, "rotation")).toBe(45);
| expect(interpolateProp(objW, objS, 25, "rotation")).toBe(-45);
| expect(interpolateProp(objS, objE, 15, "rotation")).toBe(-135);
| });
| });
|
|
