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Angle.js
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/***********************************************************************
JavaScript Angle Object
Angle object that abstracts representation and do roundings and
format strings.
Copyright (c) 2018 Sergio Lindau
***********************************************************************/
class Angle {
constructor(...args) {
this.dec = 0;
this.roundms = false;
if (args.length == 1) { // decimal
this.dec = args[0];
}
else if (args.length == 2) { // signed degree, min
this.dec = args[0] + args[1] / 60;
}
else if (args.length == 3) { // signed degree , min , sec
this.dec = args[0] + (args[1] * 60 + args[2]) / 3600;
}
else if (args.length == 4) { // sig,degree,min,sec
this.dec = ((args[0] != 0) ? (args[0] / Math.abs(args[0])) : 0) * (args[1] + (args[2] * 60 + args[3]) / 3600);
}
}
/***********************************************************************/
_minute(fraction) {
return Math.abs(~~(fraction * 60)) + ~~(this._second(this.dec - ~~this.dec) / 60);
}
/***********************************************************************/
_second(fraction) {
return Math.abs(Math.round((fraction - (~~(fraction * 60)) / 60) * 3600 * 1e9) / 1e9);
}
/***********************************************************************/
set_sigdegminsec(sig, deg, min, sec) {
this.dec = sig * (deg + (min * 60 + sec) / 3600);
}
/***********************************************************************/
get(field) {
if (arguments.length < 1)
field = Angle.DEC;
switch (field) {
case Angle.DEC:
return this.dec;
case Angle.RAD:
return this.dec * Angle.RAD_FROM_DEG;
case Angle.SIG:
return (this.dec != 0) ? (this.dec / Math.abs(this.dec)) : 0;
case Angle.DIR:
return (this.dec < 0) ? 1 : 0;
case Angle.DEG:
return Math.abs(~~this.dec) + ~~(this._minute(this.dec - ~~this.dec) / 60);
case Angle.HOURS:
return Math.abs(this.dec / 15);
case Angle.HOUR:
return Math.abs(~~this.dec / 15) + ~~(this._minute(this.dec / 15 - ~~(this.dec / 15)) / 60);
case Angle.MIN:
return this._minute(this.dec - ~~this.dec) % 60;
case Angle.HMIN:
return this._minute(this.dec / 15 - ~~(this.dec / 15)) % 60;
case Angle.SEC:
return this._second(this.dec - ~~this.dec) % 60;
case Angle.HSEC:
return this._second(this.dec / 15 - ~~(this.dec / 15)) % 60;
case Angle.MSEC:
return (this._second(this.dec - ~~this.dec) % 60) * 1e-3;
case Angle.HMSEC:
return (this._second(this.dec / 15 - ~~(this.dec / 15)) % 60) * 1e-3;
case Angle.DEGSTR:
return (this.get(Angle.SIG) * this.get(Angle.DEG)) + "º" + this.get(Angle.MIN) + "'" + this.get(Angle.SEC) + "''";
case Angle.RADSTR:
return (Math.round(this.dec / 180 * 1e9) / 1e9) + "π";
case Angle.HSTR:
return (this.get(Angle.SIG) * this.get(Angle.HOUR)) + "<sup>h</sup>" + this.get(Angle.MIN) + "<sup>m</sup>" + this.get(Angle.SEC) + "<sup>s</sup>";
case Angle.SIN:
return Math.sin(this.dec * Angle.RAD_FROM_DEG);
case Angle.COS:
return Math.cos(this.dec * Angle.RAD_FROM_DEG);
case Angle.TAN:
return Math.tan(this.dec * Angle.RAD_FROM_DEG);
case Angle.DATE:
var temp = new Date();
temp.setUTCHours(this.get(Angle.HOURS));
temp.setUTCMinutes(this.get(Angle.HMIN));
temp.setUTCSeconds(this.get(Angle.HSEC));
temp.setUTCMilliseconds(this.get(Angle.HMSEC));
return temp;
default:
return this.dec;
}
}
/***********************************************************************/
set(field, x, y) {
if ((arguments.length < 2) && (typeof (arguments[0] == 'number')))
field = Angle.DEC;
if ((arguments.length < 2) && (typeof (arguments[0] == 'string')))
field = Angle.DEGSTR;
switch (field) {
case Angle.DEC:
this.dec = x;
break;
case Angle.RAD:
this.dec = x * Angle.DEG_FROM_RAD;
break;
case Angle.SIG:
this.dec = ((x != 0) ? (x / Math.abs(x)) : 0) * Math.abs(this.dec);
break;
case Angle.DIR:
this.dec = ((x == 0) ? 1 : -1) * Math.abs(this.dec);
break;
case Angle.DEG:
this.dec = (this.get(Angle.SIG) ? this.get(Angle.SIG) : 1) * (x + Math.abs(this.dec - ~~this.dec));
break;
case Angle.HOURS:
this.dec = x * 15;
break;
case Angle.HOUR:
this.dec = (this.get(Angle.SIG) ? this.get(Angle.SIG) : 1) * (x * 15 + Math.abs(this.dec / 15 - ~~(this.dec / 15)));
break;
case Angle.MIN:
this.set_sigdegminsec((this.get(Angle.SIG) ? this.get(Angle.SIG) : 1), this.get(Angle.DEG), x, this.get(Angle.SEC));
case Angle.HMIN:
this.set_sigdegminsec((this.get(Angle.SIG) ? this.get(Angle.SIG) : 1), this.get(Angle.HOUR) * 15, x, this.get(Angle.HSEC));
break;
case Angle.SEC:
this.set_sigdegminsec((this.get(Angle.SIG) ? this.get(Angle.SIG) : 1), this.get(Angle.DEG), this.get(Angle.MIN), x);
break;
case Angle.HSEC:
this.set_sigdegminsec((this.get(Angle.SIG) ? this.get(Angle.SIG) : 1), this.get(Angle.HOUR) * 15, this.get(Angle.HMIN), x);
break;
case Angle.ASIN:
this.dec = Angle.DEG_FROM_RAD * Math.asin(x);
break;
case Angle.ACOS:
this.dec = Angle.DEG_FROM_RAD * Math.acos(x);
break;
case Angle.ATAN:
this.dec = Angle.DEG_FROM_RAD * Math.atan(x);
break;
case Angle.DATE:
this.dec = Angle.DEG_FROM_RAD * Math.atan2(x, y ? y : 0);
break;
case Angle.UNIXTIME: //*******
this.dec = Angle.DEG_FROM_RAD * Math.atan2(x, y ? y : 0);
break;
}
return this;
}
/***********************************************************************/
static log(angle) {
console.log("angle.get(Angle.DEC): " + angle.get(Angle.DEC));
console.log("angle.get(Angle.RAD): " + angle.get(Angle.RAD));
console.log("angle.get(Angle.RADSTR): " + angle.get(Angle.RADSTR));
console.log("angle.get(Angle.SIG): " + angle.get(Angle.SIG));
console.log("angle.get(Angle.DIR): " + angle.get(Angle.DIR));
console.log("angle.get(Angle.DEG): " + angle.get(Angle.DEG));
console.log("angle.get(Angle.MIN): " + angle.get(Angle.MIN));
console.log("angle.get(Angle.SEC): " + angle.get(Angle.SEC));
console.log("angle.get(Angle.DEGSTR): " + angle.get(Angle.DEGSTR));
console.log("===============================");
}
static ParseAngle(s, max) {
// Look for 1..3 floating pointer numbers, delimited by colons.
// For example: 37.35 or 43:15.373 or 23:44:55.7
// These represent degrees[:minutes[:seconds]].
// We ignore any white space outside the floating point numbers.
var RegExp_Float = /[0-9]/;
var angle = null;
var array = s.split(/\s*:\s*/);
if (array.length >= 1 && array.length <= 3) {
var denom = 1.0;
angle = 0.0;
for (var i = 0; i < array.length; ++i) {
if (!RegExp_Float.test(array[i])) {
return null; // does not look like a valid floating point number
}
var x = parseFloat(array[i]);
if (isNaN(x)) {
return null; // could not parse a floating point number
}
if (x < 0) {
return null; // user must specify direction by using E/W, N/S controls, not '+' or '-'.
}
if (i > 0) {
if (x >= 60.0) {
return null; // not a valid minute or second value
}
}
angle += x / denom;
denom *= 60.0;
}
if (angle < 0.0 || angle > max) {
return null;
}
}
return angle;
}
}
// Angle field get/set descriptors
Angle.DEC = 0;
Angle.RAD = 1;
Angle.SIG = 2;
Angle.DIR = 3;
Angle.DEG = 4;
Angle.HOURS = 5;
Angle.HOUR = 6;
Angle.MIN = 7;
Angle.HMIN = 8;
Angle.SEC = 9;
Angle.HSEC = 10;
Angle.MSEC = 11;
Angle.HMSEC = 12;
Angle.DEGSTR = 13;
Angle.RADSTR = 14;
Angle.HSTR = 15;
Angle.SIN = 16;
Angle.COS = 17;
Angle.TAN = 18;
Angle.ASIN = 19;
Angle.ACOS = 20;
Angle.ATAN = 21;
Angle.ATAN2 = 22;
Angle.DATE = 23;
Angle.UNIXTIME = 24;
Angle.DOTPROD = 25;
Angle.DEG_FROM_RAD = 180.0 / Math.PI;
Angle.RAD_FROM_DEG = Math.PI / 180.0;
Angle.HOURS_FROM_RAD = 12.0 / Math.PI;
Angle.RAD_FROM_HOURS = Math.PI / 12.0;
//export { Angle };