@spearwolf/twopoint5d/lib/stage/ProjectionPlane.spec.js

Create 2.5D realtime graphics and pixelart with WebGL and three.js

import { Plane as THREE_Plane, Vector3 } from 'three/webgpu';
import { describe, expect, it } from 'vitest';
import { ProjectionPlane } from './ProjectionPlane.js';
describe('ProjectionPlane', () => {
    it('has predefined "xy" plane', () => {
        expect(ProjectionPlane.get('xy|bottom-left')).toBeInstanceOf(ProjectionPlane);
    });
    it('has predefined "xz" plane', () => {
        expect(ProjectionPlane.get('xz|top-left')).toBeInstanceOf(ProjectionPlane);
    });
    describe('getPointByDistance()', () => {
        it('xy', () => {
            const xy = ProjectionPlane.get('xy|bottom-left');
            const p = xy.getPointByDistance(7);
            expect(p.equals(new Vector3(0, 0, 7))).toBeTruthy();
        });
        it('xz', () => {
            const xz = ProjectionPlane.get('xz|top-left');
            const p = xz.getPointByDistance(7);
            expect(p.equals(new Vector3(0, 7, 0))).toBeTruthy();
        });
    });
    describe('getOrigin()', () => {
        it('xy', () => {
            const xy = ProjectionPlane.get('xy|bottom-left');
            const p = xy.getOrigin();
            expect(p.equals(new Vector3(0, 0, 0))).toBeTruthy();
        });
        it('xz', () => {
            const xz = ProjectionPlane.get('xz|top-left');
            const p = xz.getOrigin();
            expect(p.equals(new Vector3(0, 0, 0))).toBeTruthy();
        });
        it('xy|top-left', () => {
            const xy = ProjectionPlane.get('xy|top-left');
            const p = xy.getOrigin();
            expect(p.equals(new Vector3(0, 0, 0))).toBeTruthy();
        });
        it('xz|bottom-left', () => {
            const xz = ProjectionPlane.get('xz|bottom-left');
            const p = xz.getOrigin();
            expect(p.equals(new Vector3(0, 0, 0))).toBeTruthy();
        });
        it('custom plane with offset (constant = -5)', () => {
            const customPlane = new THREE_Plane(new Vector3(0, 0, 1), -5);
            const pp = new ProjectionPlane(customPlane, new Vector3(0, 1, 0));
            const origin = pp.getOrigin();
            expect(origin.equals(new Vector3(0, 0, 5))).toBeTruthy();
        });
        it('custom plane with positive constant', () => {
            const customPlane = new THREE_Plane(new Vector3(0, 1, 0), 3);
            const pp = new ProjectionPlane(customPlane, new Vector3(0, 0, 1));
            const origin = pp.getOrigin();
            expect(origin.equals(new Vector3(0, -3, 0))).toBeTruthy();
        });
        it('uses target vector when provided', () => {
            const xy = ProjectionPlane.get('xy|bottom-left');
            const target = new Vector3(1, 2, 3);
            const result = xy.getOrigin(target);
            expect(result).toBe(target);
            expect(target.equals(new Vector3(0, 0, 0))).toBeTruthy();
        });
        it('creates new vector when target is not provided', () => {
            const xy = ProjectionPlane.get('xy|bottom-left');
            const p1 = xy.getOrigin();
            const p2 = xy.getOrigin();
            expect(p1).not.toBe(p2);
        });
    });
    describe('getForward()', () => {
        it('xy', () => {
            const xy = ProjectionPlane.get('xy|bottom-left');
            const p = xy.getForward();
            expect(p.equals(new Vector3(0, 0, -1))).toBeTruthy();
        });
        it('xz', () => {
            const xz = ProjectionPlane.get('xz|top-left');
            const p = xz.getForward();
            expect(p.equals(new Vector3(0, -1, 0))).toBeTruthy();
        });
    });
    describe('getRight()', () => {
        it('xy', () => {
            const xy = ProjectionPlane.get('xy|bottom-left');
            const p = xy.getRight();
            expect(p.equals(new Vector3(1, 0, 0))).toBeTruthy();
        });
        it('xz', () => {
            const xz = ProjectionPlane.get('xz|top-left');
            const p = xz.getRight();
            expect(p.equals(new Vector3(1, 0, 0))).toBeTruthy();
        });
    });
    describe('getPoint()', () => {
        it('xy|bottom-left', () => {
            const xy = ProjectionPlane.get('xy|bottom-left');
            const p = xy.getPoint(5, 4);
            expect(p.equals(new Vector3(5, 4, 0))).toBeTruthy();
        });
        it('xy|top-left', () => {
            const xy = ProjectionPlane.get('xy|top-left');
            const p = xy.getPoint(5, 4);
            expect(p.equals(new Vector3(5, -4, 0))).toBeTruthy();
        });
        it('xz|top-left', () => {
            const xz = ProjectionPlane.get('xz|top-left');
            const p = xz.getPoint(5, 4);
            expect(p.equals(new Vector3(5, 0, -4))).toBeTruthy();
        });
        it('xz|bottom-left', () => {
            const xz = ProjectionPlane.get('xz|bottom-left');
            const p = xz.getPoint(5, 4);
            expect(p.equals(new Vector3(5, 0, 4))).toBeTruthy();
        });
    });
});
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