Node.js examples for Geometry:Angle
Extend Number to calculate degrees To Direction
ERNO.extend( Number.prototype, {
absolute : function(){
return Math.abs( this );
},/*from w ww . j av a 2 s. com*/
add : function(){
var sum = this;
Array.prototype.slice.call( arguments ).forEach( function( n ){
sum += n;
});
return sum;
},
arcCosine : function(){
return Math.acos( this );
},
arcSine : function(){
return Math.asin( this );
},
arcTangent : function(){
return Math.atan( this );
},
constrain : function( a, b ){
var higher, lower, c = this;
b = b || 0;
higher = Math.max( a, b );
lower = Math.min( a, b );
c = Math.min( c, higher );
c = Math.max( c, lower );
return c;
},
cosine : function(){
return Math.cos( this );
},
degreesToDirection : function(){
var d = this % 360,
directions = [ 'N', 'NNE', 'NE', 'NEE', 'E', 'SEE', 'SE', 'SSE', 'S', 'SSW', 'SW', 'SWW', 'W', 'NWW', 'NW', 'NNW', 'N' ];
return directions[ this.scale( 0, 360, 0, directions.length - 1 ).round() ];
},
degreesToRadians : function(){
return this * Math.PI / 180;
},
divide : function(){
var sum = this;
Array.prototype.slice.call( arguments ).forEach( function( n ){
sum /= n;
});
return sum;
},
isBetween : function( a, b ){
var
min = Math.min( a, b ),
max = Math.max( a, b );
return ( min <= this && this <= max );
},
lerp : function( a, b ){
return a + (b - a ) * this;
},
log : function( base ){
return Math.log( this ) / ( base === undefined ? 1 : Math.log( base ));
},
log10 : function(){
// is this more pragmatic? ---> return ( '' + this.round() ).length;
return Math.log( this ) / Math.LN10;
},
maximum : function( n ){
return Math.max( this, n );
},
minimum : function( n ){
return Math.min( this, n );
},
modulo : function( n ){
return (( this % n ) + n ) % n;
},
multiply : function(){
var sum = this;
Array.prototype.slice.call( arguments ).forEach( function( n ){
sum *= n;
});
return sum;
},
normalize : function( a, b ){
if( a == b ) return 1.0;
return ( this - a ) / ( b - a );
},
raiseTo : function( exponent ){
return Math.pow( this, exponent );
},
radiansToDegrees : function(){
return this * 180 / Math.PI;
},
rand : function( n ){
var min, max;
if( n !== undefined ){
min = Math.min( this, n );
max = Math.max( this, n );
return min + Math.floor( Math.random() * ( max - min ));
}
return Math.floor( Math.random() * this );
},
random : function( n ){
var min, max;
if( n !== undefined ){
min = Math.min( this, n );
max = Math.max( this, n );
return min + Math.random() * ( max - min );
}
return Math.random() * this;
},
remainder : function( n ){
return this % n;
},
round : function( decimals ){
var n = this
decimals = decimals || 0
n *= Math.pow( 10, decimals )
n = Math.round( n )
n /= Math.pow( 10, decimals )
return n
},
roundDown : function(){
return Math.floor( this )
},
roundUp : function(){
return Math.ceil( this )
},
scale : function( a0, a1, b0, b1 ){
var phase = this.normalize( a0, a1 )
if( b0 == b1 ) return b1
return b0 + phase * ( b1 - b0 )
},
sine : function(){
return Math.sin( this )
},
subtract : function(){
var sum = this
Array.prototype.slice.call( arguments ).forEach( function( n ){
sum -= n
})
return sum
},
tangent : function(){
return Math.tan( this )
},
toArray : function(){
return [ this.valueOf() ]
},
toNumber : function(){
return this.valueOf()
},
toPaddedString : function( padding ){
return ( '0000000000000' + String( this )).slice( -padding );
},
toSignedString : function(){
var stringed = '' + this
if( this >= 0 ) stringed = '+' + stringed
return stringed
},
toString : function(){
return ''+ this
}
})