three
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JavaScript 3D library
85 lines (51 loc) • 1.53 kB
JavaScript
import { _Math } from './Math.js';
/**
* @author bhouston / http://clara.io
* @author WestLangley / http://github.com/WestLangley
*
* Ref: https://en.wikipedia.org/wiki/Spherical_coordinate_system
*
* The poles (phi) are at the positive and negative y axis.
* The equator starts at positive z.
*/
function Spherical( radius, phi, theta ) {
this.radius = ( radius !== undefined ) ? radius : 1.0;
this.phi = ( phi !== undefined ) ? phi : 0; // up / down towards top and bottom pole
this.theta = ( theta !== undefined ) ? theta : 0; // around the equator of the sphere
return this;
}
Object.assign( Spherical.prototype, {
set: function ( radius, phi, theta ) {
this.radius = radius;
this.phi = phi;
this.theta = theta;
return this;
},
clone: function () {
return new this.constructor().copy( this );
},
copy: function ( other ) {
this.radius = other.radius;
this.phi = other.phi;
this.theta = other.theta;
return this;
},
// restrict phi to be betwee EPS and PI-EPS
makeSafe: function () {
var EPS = 0.000001;
this.phi = Math.max( EPS, Math.min( Math.PI - EPS, this.phi ) );
return this;
},
setFromVector3: function ( vec3 ) {
this.radius = vec3.length();
if ( this.radius === 0 ) {
this.theta = 0;
this.phi = 0;
} else {
this.theta = Math.atan2( vec3.x, vec3.z ); // equator angle around y-up axis
this.phi = Math.acos( _Math.clamp( vec3.y / this.radius, - 1, 1 ) ); // polar angle
}
return this;
}
} );
export { Spherical };