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#include <stdio.h>
#include "wx/colour.h"
// next code is borrowed from https://stackoverflow.com/questions/3018313/algorithm-to-convert-rgb-to-hsv-and-hsv-to-rgb-in-range-0-255-for-both
typedef struct {
double r; // a fraction between 0 and 1
double g; // a fraction between 0 and 1
double b; // a fraction between 0 and 1
} rgb;
typedef struct {
double h; // angle in degrees
double s; // a fraction between 0 and 1
double v; // a fraction between 0 and 1
} hsv;
static hsv rgb2hsv(rgb in);
static rgb hsv2rgb(hsv in);
hsv rgb2hsv(rgb in)
{
hsv out;
double min, max, delta;
min = in.r < in.g ? in.r : in.g;
min = min < in.b ? min : in.b;
max = in.r > in.g ? in.r : in.g;
max = max > in.b ? max : in.b;
out.v = max; // v
delta = max - min;
if (delta < 0.00001)
{
out.s = 0;
out.h = 0; // undefined, maybe nan?
return out;
}
if( max > 0.0 ) { // NOTE: if Max is == 0, this divide would cause a crash
out.s = (delta / max); // s
} else {
// if max is 0, then r = g = b = 0
// s = 0, h is undefined
out.s = 0.0;
out.h = NAN; // its now undefined
return out;
}
if( in.r >= max ) // > is bogus, just keeps compilor happy
out.h = ( in.g - in.b ) / delta; // between yellow & magenta
else
if( in.g >= max )
out.h = 2.0 + ( in.b - in.r ) / delta; // between cyan & yellow
else
out.h = 4.0 + ( in.r - in.g ) / delta; // between magenta & cyan
out.h *= 60.0; // degrees
if( out.h < 0.0 )
out.h += 360.0;
return out;
}
hsv rgb2hsv(const std::string& str_clr_in)
{
wxColour clr(str_clr_in);
rgb in = { clr.Red() / 255.0, clr.Green() / 255.0, clr.Blue() / 255.0 };
return rgb2hsv(in);
}
rgb hsv2rgb(hsv in)
{
double hh, p, q, t, ff;
long i;
rgb out;
if(in.s <= 0.0) { // < is bogus, just shuts up warnings
out.r = in.v;
out.g = in.v;
out.b = in.v;
return out;
}
hh = in.h;
if (hh >= 360.0) hh -= 360.0;//hh = 0.0;
hh /= 60.0;
i = (long)hh;
ff = hh - i;
p = in.v * (1.0 - in.s);
q = in.v * (1.0 - (in.s * ff));
t = in.v * (1.0 - (in.s * (1.0 - ff)));
switch(i) {
case 0:
out.r = in.v;
out.g = t;
out.b = p;
break;
case 1:
out.r = q;
out.g = in.v;
out.b = p;
break;
case 2:
out.r = p;
out.g = in.v;
out.b = t;
break;
case 3:
out.r = p;
out.g = q;
out.b = in.v;
break;
case 4:
out.r = t;
out.g = p;
out.b = in.v;
break;
case 5:
default:
out.r = in.v;
out.g = p;
out.b = q;
break;
}
return out;
}
double rand_val()
{
return 0.1 * (10 - rand() % 8);
}
std::string get_opposite_color(const std::string& color)
{
std::string opp_color = "";
hsv hsv_clr = rgb2hsv(color);
hsv_clr.h += 65; // 65 instead 60 to avoid circle values
hsv_clr.s = rand_val();
hsv_clr.v = rand_val();
rgb rgb_opp_color = hsv2rgb(hsv_clr);
wxString clr_str = wxString::Format(wxT("#%02X%02X%02X"), (unsigned char)(rgb_opp_color.r * 255), (unsigned char)(rgb_opp_color.g * 255), (unsigned char)(rgb_opp_color.b * 255));
opp_color = clr_str.ToStdString();
return opp_color;
}
std::string get_opposite_color(const std::string& color_frst, const std::string& color_scnd)
{
std::string opp_color = "";
hsv hsv_frst = rgb2hsv(color_frst);
hsv hsv_scnd = rgb2hsv(color_scnd);
double delta_h = fabs(hsv_frst.h - hsv_scnd.h);
double start_h = delta_h > 180 ? std::min<double>(hsv_scnd.h, hsv_frst.h) : std::max<double>(hsv_scnd.h, hsv_frst.h);
start_h += 5; // to avoid circle change of colors for 120 deg
if (delta_h < 180)
delta_h = 360 - delta_h;
hsv hsv_opp = hsv{ start_h + 0.5 * delta_h, rand_val(), rand_val() };
rgb rgb_opp_color = hsv2rgb(hsv_opp);
wxString clr_str = wxString::Format(wxT("#%02X%02X%02X"), (unsigned char)(rgb_opp_color.r * 255), (unsigned char)(rgb_opp_color.g * 255), (unsigned char)(rgb_opp_color.b * 255));
opp_color = clr_str.ToStdString();
return opp_color;
}
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