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* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var deg2radf = require( '@stdlib/math/base/special/deg2radf' );
var kernelSinf = require( '@stdlib/math/base/special/kernel-sinf' );
var kernelCosf = require( '@stdlib/math/base/special/kernel-cosf' );
var fmodf = require( '@stdlib/math/base/special/fmodf' );
var absf = require( '@stdlib/math/base/special/absf' );
var f32 = require( '@stdlib/number/float64/base/to-float32' );
var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
var isInfinitef = require( '@stdlib/math/base/assert/is-infinitef' );
// VARIABLES //
var DEG_45 = f32( 45.0 );
var DEG_90 = f32( 90.0 );
var DEG_135 = f32( 135.0 );
var DEG_180 = f32( 180.0 );
var DEG_225 = f32( 225.0 );
var DEG_270 = f32( 270.0 );
var DEG_315 = f32( 315.0 );
var DEG_360 = f32( 360.0 );
// MAIN //
/**
* Computes the cosine of a single-precision floating-point number (in degrees).
*
* @param {number} x - input value (in degrees)
* @returns {number} cosine
*
* @example
* var v = cosdf( 0.0 );
* // returns 1.0
*
* @example
* var v = cosdf( 90.0 );
* // returns 0.0
*
* @example
* var v = cosdf( 60.0 );
* // returns ~0.5
*
* @example
* var v = cosdf( NaN );
* // returns NaN
*/
function cosdf( x ) {
var rx;
x = f32( x );
if (
isInfinitef( x ) ||
isnanf( x )
) {
return NaN;
}
rx = absf( fmodf( x, DEG_360 ) );
if ( rx <= DEG_45 ) {
return kernelCosf( deg2radf( rx ) );
}
if ( rx < DEG_135 ) {
return kernelSinf( deg2radf( f32( DEG_90-rx ) ) );
}
if ( rx <= DEG_225 ) {
return -kernelCosf( deg2radf( f32( DEG_180-rx ) ) );
}
if ( rx < DEG_315 ) {
return kernelSinf( deg2radf( f32( rx-DEG_270 ) ) );
}
return kernelCosf( deg2radf( f32( DEG_360-rx ) ) );
}
// EXPORTS //
module.exports = cosdf;
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