Converts an angle from degrees to radians (single-precision).
angle in degrees
angle in radians
var r = deg2radf( 90.0 ); // returns ~1.571
var r = deg2radf( -45.0 ); // returns ~-0.785
var r = deg2radf( NaN ); // returns NaN
Converts an angle from degrees to radians (single-precision).