three.js/test/unit/src/math/Spherical.tests.js

/* global QUnit */

import { Spherical } from '../../../../src/math/Spherical';
import { Vector3 } from '../../../../src/math/Vector3';
import {
	eps
} from './Constants.tests';

export default QUnit.module( 'Maths', () => {

	QUnit.module( 'Spherical', () => {

		// INSTANCING
		QUnit.test( "Instancing", ( assert ) => {

			var a = new Spherical();
			var radius = 10.0;
			var phi = Math.acos( - 0.5 );
			var theta = Math.sqrt( Math.PI ) * phi;

			assert.strictEqual( a.radius, 1.0, "Default values: check radius" );
			assert.strictEqual( a.phi, 0, "Default values: check phi" );
			assert.strictEqual( a.theta, 0, "Default values: check theta" );

			var a = new Spherical( radius, phi, theta );
			assert.strictEqual( a.radius, radius, "Custom values: check radius" );
			assert.strictEqual( a.phi, phi, "Custom values: check phi" );
			assert.strictEqual( a.theta, theta, "Custom values: check theta" );

		} );

		// PUBLIC STUFF
		QUnit.todo( "isSpherical", ( assert ) => {

			assert.ok( false, "everything's gonna be alright" );

		} );

		QUnit.test( "set", ( assert ) => {

			var a = new Spherical();
			var radius = 10.0;
			var phi = Math.acos( - 0.5 );
			var theta = Math.sqrt( Math.PI ) * phi;

			a.set( radius, phi, theta );
			assert.strictEqual( a.radius, radius, "Check radius" );
			assert.strictEqual( a.phi, phi, "Check phi" );
			assert.strictEqual( a.theta, theta, "Check theta" );

		} );

		QUnit.test( "clone", ( assert ) => {

			var radius = 10.0;
			var phi = Math.acos( - 0.5 );
			var theta = Math.sqrt( Math.PI ) * phi;
			var a = new Spherical( radius, phi, theta );
			var b = a.clone();

			assert.propEqual( a, b, "Check a and b are equal after clone()" );

			a.radius = 2.0;
			assert.notPropEqual( a, b, "Check a and b are not equal after modification" );

		} );

		QUnit.test( "copy", ( assert ) => {

			var radius = 10.0;
			var phi = Math.acos( - 0.5 );
			var theta = Math.sqrt( Math.PI ) * phi;
			var a = new Spherical( radius, phi, theta );
			var b = new Spherical().copy( a );

			assert.propEqual( a, b, "Check a and b are equal after copy()" );

			a.radius = 2.0;
			assert.notPropEqual( a, b, "Check a and b are not equal after modification" );

		} );

		QUnit.test( "makeSafe", ( assert ) => {

			var EPS = 0.000001; // from source
			var tooLow = 0.0;
			var tooHigh = Math.PI;
			var justRight = 1.5;
			var a = new Spherical( 1, tooLow, 0 );

			a.makeSafe();
			assert.strictEqual( a.phi, EPS, "Check if small values are set to EPS" );

			a.set( 1, tooHigh, 0 );
			a.makeSafe();
			assert.strictEqual( a.phi, Math.PI - EPS, "Check if high values are set to (Math.PI - EPS)" );

			a.set( 1, justRight, 0 );
			a.makeSafe();
			assert.strictEqual( a.phi, justRight, "Check that valid values don't get changed" );

		} );

		QUnit.test( "setFromVector3", ( assert ) => {

			var a = new Spherical( 1, 1, 1 );
			var b = new Vector3( 0, 0, 0 );
			var c = new Vector3( Math.PI, 1, - Math.PI );
			var expected = new Spherical( 4.554032147688322, 1.3494066171539107, 2.356194490192345 );

			a.setFromVector3( b );
			assert.strictEqual( a.radius, 0, "Zero-length vector: check radius" );
			assert.strictEqual( a.phi, 0, "Zero-length vector: check phi" );
			assert.strictEqual( a.theta, 0, "Zero-length vector: check theta" );

			a.setFromVector3( c );
			assert.ok( Math.abs( a.radius - expected.radius ) <= eps, "Normal vector: check radius" );
			assert.ok( Math.abs( a.phi - expected.phi ) <= eps, "Normal vector: check phi" );
			assert.ok( Math.abs( a.theta - expected.theta ) <= eps, "Normal vector: check theta" );

		} );

	} );

} );