We Keep Coding

What does "-?" as double type represent in C#?

So I'm running iterations with this formula:
double x = 10 / 0.25 * ((0.0002 * x1 * (10 - 0.25 * x1)) + 0.00217 * x2 * (20 - 0.25 * x2)); With this process: Xn+1 = f(Xn).
And if you start from negative X you will eventually end up with (-/+) infinity, so after 6 iterations I'm supposed to get infinity, but what I got surprised me and I couldn't find anywhere what that is, I got "-?", I've tried comparing it to +/- infinity and tried to compare it to int numbers just to clarify what it is, but I cant get anything out of it, for example, I've tried if ("-?" > 1000) break;, and it doesn't outcome as "true". Neither am I getting any errors by comparing it to int/double, I need to stop iterations when I start going into infinity, how can I do that?
code:
public static double CalculateX1(double x1, double x2)
{
double x = 10 / 0.25 * ((0.0002 * x1 * (10 - 0.25 * x1)) + 0.00217 * x2 * (20 - 0.25 * x2));
return x;
}
public static double CalculateX2(double x2, double x1)
{
double y = 20 / 0.25 * ((0.00052 * x2 * (20 - 0.25 * x2)) + 0.0075 * x1 * (10 - 0.25 * x1));
return y;
}
static void Main(string[] args)
{
string writePath = #"C:\Users\evluc\Desktop\cord.txt";
double X = -5;
double Y = -5;
int pointer = 1;
double[,] coordinates = new double[10001, 2];
coordinates[0, 0] = X;
coordinates[0, 1] = Y;
for (int i = 0; i < 5000; i++)
{
//double XTemp = CalculateX1(X, Y);
//double YTemp = CalculateX2(Y, X);
//X = CalculateX1(coordinates[pointer - 1, 0], coordinates[pointer - 1, 1]);
//Y = CalculateX2(coordinates[pointer - 1, 1], coordinates[pointer - 1, 0]);
coordinates[pointer, 0] = CalculateX1(coordinates[pointer - 1, 0], coordinates[pointer - 1, 1]);
coordinates[pointer, 1] = CalculateX2(coordinates[pointer - 1, 1], coordinates[pointer - 1, 0]);
pointer++;
if (Math.Abs(coordinates[pointer, 0]) > 1000 || Math.Abs(coordinates[pointer, 1]) > 1000)
{
Console.WriteLine("infinity");
Console.ReadKey();
}
}
for (int i = 0; i < 5000; i++)
{
Console.WriteLine("X = " + coordinates[i, 0] + "," + "Y = " + coordinates[i, 1] + "; ");
}
}

I think whatever you use to display/inspect the value cannot print ∞.
double d = double.MinValue;
d *= 2;
Console.WriteLine($"{d}: IsInfinity: {double.IsNegativeInfinity(d)}");
-∞: IsInfinity: True
Stopping at infinity
Here's a loop that stops at infinity:
double d = 2;
var i = 1;
while(!double.IsInfinity(d))
{
d = i*d*d;
i = -i;
}
Console.WriteLine(d);
-∞

How to return two list with a double method? [duplicate]

This question already has answers here:
Return multiple values to a method caller
(28 answers)
Closed 3 years ago.
I'm working on a C# program that getting some values from textboxes and set them to some variables in 2 class that their name is:"Tfluid" and "Twell"
then I use them in another class the name is "Tcalc" through a method with name "fluidcal" and make some calculations with them,
I have 2 crossed while that means it starts with a "ql" and then match a final P to each "ql". now I want to use these (ql, P) to plot a graph in another form,
so what is the best way of saving them
(i don't know what should I return with the fluidal method)
and how can I add them to the chart?
this is my calculation process
public double Fluidcal(TWell well, TFluid fluid)
{
double froudnumber, noslipholdup, vm, vsl, vsg, liquidvelocitynumber, l1, l2, l3, l4, fluidregim, hozhold, C, psy, liqhold, liqholdseg, liqholdinter, fn, nren, densityn, viscosityn, y, S, ftp, dpdzel, dpdzf, dpperdzt, rhos, Ek,ql;
ql = 1;
while (ql<=fluid.maxoilflowrate)
{
vsl = (ql) / Math.PI * Math.Pow(well.tubingdiameter / 2, 2); //superficial velocities
vsg = (ql * fluid.gor) / Math.PI * Math.Pow(well.tubingdiameter / 2, 2);
vm = vsl + vsg;
double nowlength = 0;
double P = well.wellheadpressure;
while (nowlength <= well.welldepth)
{
froudnumber = Math.Pow(vm, 2) / well.tubingdiameter * 32.174; //froud number
noslipholdup = vsl / vm; //no slip holdup
double newoildensity = fluid.oildensity / (1 + 0.00056 * (0.01515 * nowlength));
liquidvelocitynumber = vsl * Math.Pow((newoildensity / 32.174 * fluid.gasliquidsurfacetension), 0.25); //liquid velocity number
//correlating parametrs
l1 = 316 * Math.Pow(noslipholdup, 0.302);
l2 = 0.0009252 * Math.Pow(noslipholdup, -2.4684);
l3 = 0.1 * Math.Pow(noslipholdup, -1.4516);
l4 = 0.5 * Math.Pow(noslipholdup, -6.738);
fluidregim = 0;
C = 0;
liqhold = 0;
if ((noslipholdup < 0.01 && froudnumber < l1) || (noslipholdup >= 0.01 && froudnumber < l2))
{
segregated(froudnumber, noslipholdup, liquidvelocitynumber, out fluidregim, out hozhold, out C, out psy, out liqhold);
}
else if ((noslipholdup >= 0.01 && l2 < froudnumber && froudnumber <= l3))
{
transition(froudnumber, noslipholdup, liquidvelocitynumber, l2, l3, out fluidregim, out hozhold, out C, out psy, out liqhold, out liqholdseg, out liqholdinter);
}
else if ((noslipholdup >= 0.01 && noslipholdup < 0.4 && froudnumber > l3 && froudnumber <= l1)
|| (noslipholdup >= 0.4 && l3 < froudnumber && froudnumber <= 4))
{
intermittent(froudnumber, noslipholdup, liquidvelocitynumber, out fluidregim, out hozhold, out C, out psy, out liqhold);
}
else if ((noslipholdup < 0.4 && froudnumber >= l1) || (noslipholdup >= 0.4 && froudnumber > l4))
{
disturbuted(froudnumber, noslipholdup, out fluidregim, out hozhold, out C, out psy, out liqhold);
}
// else
// {
// System.Windows.Forms.MessageBox.Show("Undefined Flow Regim");
//}
y = noslipholdup / Math.Pow(liqhold, 2);
if (y > 1 && y < 1.2)
{
S = Math.Log(2.2 * y - 1.2);
}
else
{
S = (Math.Log(y)) / (-0.0523 + 3.182 * Math.Log(y) - 0.8725 * Math.Pow(Math.Log(y), 2) + 0.01853 * Math.Pow(Math.Log(y), 4));
}
viscosityn = fluid.oilviscosity * noslipholdup + fluid.gasviscosity * (1 - noslipholdup);
densityn = fluid.oildensity * noslipholdup + (1 - noslipholdup) * fluid.gasdensity;
nren = densityn * vm * (well.tubingdiameter) / viscosityn;
fn = 1 / Math.Pow((2 * Math.Log(nren / (4.5223 * Math.Log(nren) - 3.8215))), 2);
ftp = fn * Math.Exp(S);
rhos = fluid.oildensity * liqhold + fluid.gasdensity * (1 - liqhold);
Ek = rhos * vm * vsg / 32.2 * P;
dpdzel = (1) * rhos;
dpdzf = ftp * densityn * Math.Pow(vm, 2) / 2 * 32.174 * well.tubingdiameter;
dpperdzt = (dpdzel + dpdzf) / 1 - Ek;
P = P + 5 * dpperdzt;
yax.Add(P);
nowlength = +5;
vsl = vm * liqhold;
vsg = vsl * fluid.gor;
}
ql = +20;
}return; //what should I write here?I want pairs of(ql,P)

There are a few ways you could do this. I would suggest encapsulating the lists in an object and returning that object from your method. For example:
public class MyLists
{
public List<double> ListOne { get; set; }
public List<double> ListTwo { get; set; }
}
Of course, you could use a Tuple. If I understand your question correctly...

how to read values from my text file and store in variables to do mathematical calculations?

int a=6378137;
int A0=6367449;
double B0=16038.43;
double C0=16.83261;
double D0=0.021984;
double E0= 0.000313;
double k0=0.9996;
double e1=0.081819;
double e1sq = 0.006739497;
double m = -120;
double l = 60;
int n = 11;
int o = 6 *n- 183;
double p = ((m - o) * 0.01744444);
double q = l * 0.0174444;
double r = m * 0.0174444;
double s = a * (1 - e1 * e1) / (1 - ((e1 * Math.Sin(q)) * (e1 * Math.Sin(q))*(e1 * Math.Sin(q))));
double t = a / ((1 - (e1 * Math.Sin(q))));
double v = A0 * q - B0 * Math.Sin(2 * q) + C0 * Math.Sin(4 * q) - D0 * Math.Sin(6 * q) + E0 * Math.Sin(8 * q);
double x = v * k0;
double y = t * Math.Sin(q) * Math.Cos(q) / 2;
double z = (t * Math.Sin(q) * (Math.Cos(q)* Math.Cos(q)*Math.Cos(q)) / 24) * (5 - (Math.Tan(q)* Math.Tan(q)) + 9 * e1sq * (Math.Cos(q) *Math.Cos(q)) + 4 * e1sq *e1sq * (Math.Cos(q)*Math.Cos(q)*Math.Cos(q)*Math.Cos(q)) ) * k0;
double AA = t * Math.Cos(q) * k0;
double AB = (Math.Cos(q)*Math.Cos(q)*Math.Cos(q)) * (t / 6) * (1 - (Math.Tan(q) *Math.Tan(q)) + e1sq * (Math.Cos(q) *Math.Cos(q))) * k0;
double AC = ((p * p * p * p * p * p) * t * Math.Sin(q) * (Math.Cos(q) * Math.Cos(q) * Math.Cos(q) * Math.Cos(q) * Math.Cos(q)) / 720) * (61 - 58 * (Math.Tan(q) * Math.Tan(q)) + (Math.Tan(q) * Math.Tan(q) * Math.Tan(q) * Math.Tan(q)) + 270 * e1sq * (Math.Cos(q) * Math.Cos(q)) - 330 * e1sq * (Math.Sin(q) * Math.Sin(q))) * k0;
double AD = (x+y*p*p+z*(p*p*p*p));
double AE;
double AF;
if (AD < 0)
{
AE = (10000000 + AD);
}
else {
AE = AD;
}
AF = 500000 + (AA * p + AB * (p * p * p));
using (StreamWriter writer = new StreamWriter(#"C:\Users\dcf\Desktop\out.txt"))
{
writer.WriteLine("north:{0}",AE);
writer.WriteLine("east:{0}",AF);
}
This is my code where m and l value should have the value from text file. my text file looks like
m,l
56536716.534,43843327.880
56584832.507,43501825.240
56669161.226,43199470.844
56715913.464,42856275.950
56782842.247,42435886.070
56810019.308,42071222.859
56836462.600,41706208.191
56900872.591,41282609.754
i need to read m and l value directly from my text file to do calcultion.

Assuming the values for m and l are alternating in your textfile.
First you should read in the file, split the values by a delimter(e.g. ",") and assign them to variables m and l. Then you can call your calculation-function for each
private void readFile(pathToFile)
{
var textfilecontent= File.ReadAllLines(pathToFile);
for (int i = 1; i < textfilecontent.Length; i++)
{
// splits the values at delimiter ,
var valPerLine = textfilecontent[i].Split(',');
// only works if you have only two numbers per line
calculate(Convert.ToDouble(valPerLine[0]), Convert.ToDouble(valPerLine[1]))
}
}
private void calculate(double m, double l)
{
// your formulas, m and l should now be inserted as parameter
int a=6378137;
int A0=6367449;
double B0=16038.43;
double C0=16.83261;
double D0=0.021984;
double E0= 0.000313;
double k0=0.9996;
double e1=0.081819;
double e1sq = 0.006739497;
//double m = -120;
//double l = 60;
int n = 11;
int o = 6 *n- 183;
double p = ((m - o) * 0.01744444);
double q = l * 0.0174444;
double r = m * 0.0174444;
double s = a * (1 - e1 * e1) / (1 - ((e1 * Math.Sin(q)) * (e1 * Math.Sin(q))*(e1 * Math.Sin(q))));
double t = a / ((1 - (e1 * Math.Sin(q))));
double v = A0 * q - B0 * Math.Sin(2 * q) + C0 * Math.Sin(4 * q) - D0 * Math.Sin(6 * q) + E0 * Math.Sin(8 * q);
double x = v * k0;
double y = t * Math.Sin(q) * Math.Cos(q) / 2;
double z = (t * Math.Sin(q) * (Math.Cos(q)* Math.Cos(q)*Math.Cos(q)) / 24) * (5 - (Math.Tan(q)* Math.Tan(q)) + 9 * e1sq * (Math.Cos(q) *Math.Cos(q)) + 4 * e1sq *e1sq * (Math.Cos(q)*Math.Cos(q)*Math.Cos(q)*Math.Cos(q)) ) * k0;
double AA = t * Math.Cos(q) * k0;
double AB = (Math.Cos(q)*Math.Cos(q)*Math.Cos(q)) * (t / 6) * (1 - (Math.Tan(q) *Math.Tan(q)) + e1sq * (Math.Cos(q) *Math.Cos(q))) * k0;
double AC = ((p * p * p * p * p * p) * t * Math.Sin(q) * (Math.Cos(q) * Math.Cos(q) * Math.Cos(q) * Math.Cos(q) * Math.Cos(q)) / 720) * (61 - 58 * (Math.Tan(q) * Math.Tan(q)) + (Math.Tan(q) * Math.Tan(q) * Math.Tan(q) * Math.Tan(q)) + 270 * e1sq * (Math.Cos(q) * Math.Cos(q)) - 330 * e1sq * (Math.Sin(q) * Math.Sin(q))) * k0;
double AD = (x+y*p*p+z*(p*p*p*p));
double AE;
double AF;
if (AD < 0)
{
AE = (10000000 + AD);
}
else
{
AE = AD;
}
AF = 500000 + (AA * p + AB * (p * p * p));
using (StreamWriter writer = new StreamWriter(#"C:\Users\dcf\Desktop\out.txt"))
{
writer.WriteLine("north:{0}",AE);
writer.WriteLine("east:{0}",AF);
}
}

System.NullReferenceException C# advice?

I'm getting an exception when I'm trying to run my program.. It seems to me it's working well but I'm missing something as it appears.
public Coord LatLonToUTMXY(double lat, double lon)
{
Coord co = new Coord();
co.zone = Math.Floor((lon + 180.0) / 6) + 1;
//double zone = Math.Floor((lon + 180.0) / 6) + 1;
MapLatLonToXY(DegToRad(lat), DegToRad(lon), UTMCentralMeridian(co.zone), co.eastNorth);
/* Adjust easting and northing for UTM system. */
co.eastNorth[0] = co.eastNorth[0] * UTMScaleFactor + 500000.0;
co.eastNorth[1] = co.eastNorth[1] * UTMScaleFactor;
if (co.eastNorth[1] < 0.0)
co.eastNorth[1] = co.eastNorth[1] + 10000000.0;
return co;
}
I'm getting the exception here ...
public void MapLatLonToXY(double phi, double lambda, double lambda0, double [] xy)
{
//Some previous code
//Exception for xy[0] ....!
xy[0] = N * Math.Cos(phi) * l
+ (N / 6.0 * Math.Pow(Math.Cos(phi), 3.0) * l3coef * Math.Pow(l, 3.0))
+ (N / 120.0 * Math.Pow(Math.Cos(phi), 5.0) * l5coef * Math.Pow(l, 5.0))
+ (N / 5040.0 * Math.Pow(Math.Cos(phi), 7.0) * l7coef * Math.Pow(l, 7.0));
/* Calculate northing (y) */
xy[1] = ArcLengthOfMeridian(phi)
+ (t / 2.0 * N * Math.Pow(Math.Cos(phi), 2.0) * Math.Pow(l, 2.0))
+ (t / 24.0 * N * Math.Pow(Math.Cos(phi), 4.0) * l4coef * Math.Pow(l, 4.0))
+ (t / 720.0 * N * Math.Pow(Math.Cos(phi), 6.0) * l6coef * Math.Pow(l, 6.0))
+ (t / 40320.0 * N * Math.Pow(Math.Cos(phi), 8.0) * l8coef * Math.Pow(l, 8.0));
return;
}
for the co it's a struct
public struct Coord
{
public double zone;
public double[] eastNorth;
}
What am I missing here ?
Thanks

This is happening because the xy array in your function (which comes from Coord.eastNorth is uninitialized. I noticed that Coord was a struct and not a class.. any particular reason? This would work if Coord was a class
public class Coord
{
public double Zone {get; set;}
public List<double> EastNorth {get; set;}
public Coord()
{
EastNorth = new List<double>();
}
}
public List<double> MapLatLonToXY(double phi, double lambda, double lambda0)
{
var xy = new List<double>();
//Exception for xy[0] ....!
xy.Add(N * Math.Cos(phi) * l
+ (N / 6.0 * Math.Pow(Math.Cos(phi), 3.0) * l3coef * Math.Pow(l, 3.0))
+ (N / 120.0 * Math.Pow(Math.Cos(phi), 5.0) * l5coef * Math.Pow(l, 5.0))
+ (N / 5040.0 * Math.Pow(Math.Cos(phi), 7.0) * l7coef * Math.Pow(l, 7.0)));
/* Calculate northing (y) */
xy.Add(ArcLengthOfMeridian(phi)
+ (t / 2.0 * N * Math.Pow(Math.Cos(phi), 2.0) * Math.Pow(l, 2.0))
+ (t / 24.0 * N * Math.Pow(Math.Cos(phi), 4.0) * l4coef * Math.Pow(l, 4.0))
+ (t / 720.0 * N * Math.Pow(Math.Cos(phi), 6.0) * l6coef * Math.Pow(l, 6.0))
+ (t / 40320.0 * N * Math.Pow(Math.Cos(phi), 8.0) * l8coef * Math.Pow(l, 8.0)));
return xy;
}
public Coord LatLonToUTMXY(double lat, double lon)
{
Coord co = new Coord();
co.zone = Math.Floor((lon + 180.0) / 6) + 1;
//double zone = Math.Floor((lon + 180.0) / 6) + 1;
co.EastNorth = MapLatLonToXY(DegToRad(lat), DegToRad(lon), UTMCentralMeridian(co.zone));
/* Adjust easting and northing for UTM system. */
co.EastNorth[0] = co.EastNorth[0] * UTMScaleFactor + 500000.0;
co.EastNorth[1] = co.EastNorth[1] * UTMScaleFactor;
if (co.EastNorth[1] < 0.0)
co.EastNorth[1] = co.EastNorth[1] + 10000000.0;
return co;
}

RGB to HSL, hue calculation is wrong

I'm trying to convert a RGB32 value to HSL because I want to use the Hue component.
I have used some examples that I found online to create this class:
public class HSLColor
{
public Double Hue;
public Double Saturation;
public Double Luminosity;
public HSLColor(Double H, Double S, Double L)
{
Hue = H;
Saturation = S;
Luminosity = L;
}
public static HSLColor FromRGB(Color Clr)
{
return FromRGB(Clr.R, Clr.G, Clr.B);
}
public static HSLColor FromRGB(Byte R, Byte G, Byte B)
{
Double _R = (R / 255d);
Double _G = (G / 255d);
Double _B = (B / 255d);
Double _Min = Math.Min(Math.Min(_R, _G), _B);
Double _Max = Math.Max(Math.Max(_R, _G), _B);
Double _Delta = _Max - _Min;
Double H = 0;
Double S = 0;
Double L = (float)((_Max + _Min) / 2.0f);
if (_Delta != 0)
{
if (L < 0.5d)
{
S = (float)(_Delta / (_Max + _Min));
}
else
{
S = (float)(_Delta / (2.0f - _Max - _Min));
}
if (_R == _Max)
{
H = (_G - _B) / _Delta;
}
else if (_G == _Max)
{
H = 2f + (_B - _R) / _Delta;
}
else if (_B == _Max)
{
H = 4f + (_R - _G) / _Delta;
}
}
//Convert to degrees
H = H * 60d;
if (H < 0) H += 360;
//Convert to percent
S *= 100d;
L *= 100d;
return new HSLColor(H, S, L);
}
private Double Hue_2_RGB(Double v1, Double v2, Double vH)
{
if (vH < 0) vH += 1;
if (vH > 1) vH -= 1;
if ((6.0d * vH) < 1) return (v1 + (v2 - v1) * 6 * vH);
if ((2.0d * vH) < 1) return (v2);
if ((3.0d * vH) < 2) return (v1 + (v2 - v1) * ((2.0d / 3.0d) - vH) * 6.0d);
return (v1);
}
public Color ToRGB()
{
Color Clr = new Color();
Double var_1, var_2;
if (Saturation == 0)
{
Clr.R = (Byte)(Luminosity * 255);
Clr.G = (Byte)(Luminosity * 255);
Clr.B = (Byte)(Luminosity * 255);
}
else
{
if (Luminosity < 0.5) var_2 = Luminosity * (1 + Saturation);
else var_2 = (Luminosity + Saturation) - (Saturation * Luminosity);
var_1 = 2 * Luminosity - var_2;
Clr.R = (Byte)(255 * Hue_2_RGB(var_1, var_2, Hue + (1 / 3)));
Clr.G = (Byte)(255 * Hue_2_RGB(var_1, var_2, Hue));
Clr.B = (Byte)(255 * Hue_2_RGB(var_1, var_2, Hue - (1 / 3)));
}
return Clr;
}
}
However it doesn't seem to work correctly,
If I use an input color of (R 0, G 255, B 193) for example:
I get Hue = 0
while in photoshop if I choose the exact same RGB values I get:
Hue = 165
which is the correct value.
I want the Hue to be a value ranging from 0 to 360 or 0 to 240
What is the problem?..
Reference:
EasyRGB RGB->HSL

R / 255
this is integer division, meaning you get either 0 or 1. try:
(float)R / 255
and for all other cases.
for constants try:
( 1 / 3 ) -> ( 1.0 / 3.0 )

The below is open source mixture of Drupal + some various programmers work mixed into one single function boasting RGB > HSL and back. It works flawlessly.
<?php
### RGB >> HSL
function _color_rgb2hsl($rgb) {
$r = $rgb[0]; $g = $rgb[1]; $b = $rgb[2];
$min = min($r, min($g, $b)); $max = max($r, max($g, $b));
$delta = $max - $min; $l = ($min + $max) / 2; $s = 0;
if ($l > 0 && $l < 1) {
$s = $delta / ($l < 0.5 ? (2 * $l) : (2 - 2 * $l));
}
$h = 0;
if ($delta > 0) {
if ($max == $r && $max != $g) $h += ($g - $b) / $delta;
if ($max == $g && $max != $b) $h += (2 + ($b - $r) / $delta);
if ($max == $b && $max != $r) $h += (4 + ($r - $g) / $delta);
$h /= 6;
} return array($h, $s, $l);
}
### HSL >> RGB
function _color_hsl2rgb($hsl) {
$h = $hsl[0]; $s = $hsl[1]; $l = $hsl[2];
$m2 = ($l <= 0.5) ? $l * ($s + 1) : $l + $s - $l*$s;
$m1 = $l * 2 - $m2;
return array(_color_hue2rgb($m1, $m2, $h + 0.33333),
_color_hue2rgb($m1, $m2, $h),
_color_hue2rgb($m1, $m2, $h - 0.33333));
}
### Helper function for _color_hsl2rgb().
function _color_hue2rgb($m1, $m2, $h) {
$h = ($h < 0) ? $h + 1 : (($h > 1) ? $h - 1 : $h);
if ($h * 6 < 1) return $m1 + ($m2 - $m1) * $h * 6;
if ($h * 2 < 1) return $m2;
if ($h * 3 < 2) return $m1 + ($m2 - $m1) * (0.66666 - $h) * 6;
return $m1;
}
### Convert a hex color into an RGB triplet.
function _color_unpack($hex, $normalize = false) {
if (strlen($hex) == 4) {
$hex = $hex[1] . $hex[1] . $hex[2] . $hex[2] . $hex[3] . $hex[3];
} $c = hexdec($hex);
for ($i = 16; $i >= 0; $i -= 8) {
$out[] = (($c >> $i) & 0xFF) / ($normalize ? 255 : 1);
} return $out;
}
### Convert an RGB triplet to a hex color.
function _color_pack($rgb, $normalize = false) {
foreach ($rgb as $k => $v) {
$out |= (($v * ($normalize ? 255 : 1)) << (16 - $k * 8));
}return '#'. str_pad(dechex($out), 6, 0, STR_PAD_LEFT);
}
print "Hex: ";
$testhex = "#b7b700";
print $testhex;
$testhex2rgb = _color_unpack($testhex,true);
print "<br />RGB: ";
var_dump($testhex2rgb);
print "<br />HSL color module: ";
$testrgb2hsl = _color_rgb2hsl($testhex2rgb); //Convert to HSL
var_dump($testrgb2hsl);
print "<br />RGB: ";
$testhsl2rgb = _color_hsl2rgb($testrgb2hsl); // And back to RGB
var_dump($testhsl2rgb);
print "<br />Hex: ";
$testrgb2hex = _color_pack($testhsl2rgb,true);
var_dump($testrgb2hex);
?>