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nilsberglund-orleans
2021-10-24 15:20:56 +02:00
committed by GitHub
parent 660e3d15fd
commit dadfb985ed
18 changed files with 3207 additions and 502 deletions
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colors_waves.c Normal file
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#include "colormaps.c"
double color_amplitude(double value, double scale, int time)
/* transforms the wave amplitude into a double in [-1,1] to feed into color scheme */
{
return(tanh(SLOPE*value/scale)*exp(-((double)time*ATTENUATION)));
}
double color_amplitude_asym(double value, double scale, int time)
/* transforms the wave amplitude into a double in [-1,1] to feed into color scheme */
{
return(2.0*tanh(SLOPE*value/scale)*exp(-((double)time*ATTENUATION)) - 1.0);
}
void color_scheme(int scheme, double value, double scale, int time, double rgb[3]) /* color scheme */
{
double hue, y, r, amplitude;
int intpart;
/* saturation = r, luminosity = y */
switch (scheme) {
case (C_LUM):
{
hue = COLORHUE + (double)time*COLORDRIFT/(double)NSTEPS;
if (hue < 0.0) hue += 360.0;
if (hue >= 360.0) hue -= 360.0;
r = 0.9;
amplitude = color_amplitude(value, scale, time);
y = LUMMEAN + amplitude*LUMAMP;
intpart = (int)y;
y -= (double)intpart;
hsl_to_rgb(hue, r, y, rgb);
break;
}
case (C_HUE):
{
r = 0.9;
amplitude = color_amplitude(value, scale, time);
y = 0.5;
hue = HUEMEAN + amplitude*HUEAMP;
if (hue < 0.0) hue += 360.0;
if (hue >= 360.0) hue -= 360.0;
hsl_to_rgb(hue, r, y, rgb);
break;
}
case (C_ONEDIM):
{
amplitude = color_amplitude(value, scale, time);
amp_to_rgb(0.5*(1.0 + amplitude), rgb);
break;
}
}
}
void color_scheme_lum(int scheme, double value, double scale, int time, double lum, double rgb[3]) /* color scheme */
{
double hue, y, r, amplitude;
int intpart;
/* saturation = r, luminosity = y */
switch (scheme) {
case (C_LUM):
{
hue = COLORHUE + (double)time*COLORDRIFT/(double)NSTEPS;
if (hue < 0.0) hue += 360.0;
if (hue >= 360.0) hue -= 360.0;
r = 0.9;
amplitude = color_amplitude(value, scale, time);
y = LUMMEAN + amplitude*LUMAMP;
intpart = (int)y;
y -= (double)intpart;
hsl_to_rgb(hue, r, y, rgb);
break;
}
case (C_HUE):
{
r = 0.9;
amplitude = color_amplitude(value, scale, time);
y = lum;
hue = HUEMEAN + amplitude*HUEAMP;
if (hue < 0.0) hue += 360.0;
if (hue >= 360.0) hue -= 360.0;
hsl_to_rgb(hue, r, y, rgb);
break;
}
}
}
void color_scheme_asym(int scheme, double value, double scale, int time, double rgb[3]) /* color scheme */
{
double hue, y, r, amplitude;
int intpart;
/* saturation = r, luminosity = y */
switch (scheme) {
case (C_LUM):
{
hue = COLORHUE + (double)time*COLORDRIFT/(double)NSTEPS;
if (hue < 0.0) hue += 360.0;
if (hue >= 360.0) hue -= 360.0;
r = 0.9;
amplitude = color_amplitude(value, scale, time);
y = LUMMEAN + amplitude*LUMAMP;
intpart = (int)y;
y -= (double)intpart;
hsl_to_rgb(hue, r, y, rgb);
break;
}
case (C_HUE):
{
r = 0.9;
amplitude = color_amplitude_asym(value, scale, time);
y = 0.5;
hue = HUEMEAN + 0.8*amplitude*HUEAMP;
if (hue < 0.0) hue += 360.0;
if (hue >= 360.0) hue -= 360.0;
hsl_to_rgb(hue, r, y, rgb);
break;
}
case (C_ONEDIM):
{
amplitude = color_amplitude(value, scale, time);
amp_to_rgb(amplitude, rgb);
break;
}
}
}