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import graph;
usepackage("ocg");
settings.tex="pdflatex";
// Dan Bruton algorithm
pen nm2rgb(real wl, real gamma=0.8, bool intensity=true) {
triple rgb;
if(wl >= 380 && wl <= 440) {rgb=((440-wl)/60,0,1);}
if(wl > 440 && wl <= 490) {rgb=(0,(wl-440)/50,1);}
if(wl > 490 && wl <= 510) {rgb=(0,1,(510-wl)/20);}
if(wl > 510 && wl <= 580) {rgb=((wl-510)/70,1,0);}
if(wl > 580 && wl <= 645) {rgb=(1,(645-wl)/65,0);}
if(wl > 645 && wl <= 780) {rgb=(1,0,0);}
real Intensity=1;
if(intensity) {
if(wl >= 700) {Intensity=0.3+0.7*(780-wl)/80;}
else if(wl <= 420) {Intensity=0.3+0.7*(wl-380)/40;}
}
return rgb((Intensity*rgb.x)**gamma,(Intensity*rgb.y)**gamma,
(Intensity*rgb.z)**gamma);
}
real width=1;
real height=50;
begin("spectrum");
for(real i=380 ; i <= 780 ; i += width) {
draw((i,0)--(i,height),width+nm2rgb(wl=i,false)+squarecap);
}
begin("Extinction",false); // nested
for(real i=380 ; i <= 780 ; i += width) {
draw((i,0)--(i,height),width+nm2rgb(wl=i,true)+squarecap);
}
end();
end();
begin("Wavelength");
xaxis(scale(0.5)*"$\lambda$(nm)",BottomTop,380,780,
RightTicks(scale(0.5)*rotate(90)*Label(),step=2,Step=10),above=true);
end();
// From Astronomical Data Center(NASA)
// Neutral only
real[] Na={423.899, 424.208, 427.364, 427.679, 428.784, 429.101,
432.14, 432.462, 434.149, 434.474, 439.003, 439.334, 441.989, 442.325,
449.418, 449.766, 454.163, 454.519, 568.2633, 568.8204, 588.995,
589.5924};
begin("Na absorption");
for(int i=0; i < Na.length; ++i) {
draw((Na[i],0)--(Na[i],height),0.1*width+squarecap);
}
end();
begin("Na emission");
for(int i=0; i < Na.length; ++i) {
draw((Na[i],0)--(Na[i],-height),0.1*width+nm2rgb(Na[i],false)+squarecap);
}
end();
// Neutral only
real[] Zn={388.334, 396.543, 411.321, 429.288, 429.833, 462.981,
468.014, 472.215, 481.053 , 506.866, 506.958, 518.198, 530.865,
531.024, 531.102, 577.21, 577.55, 577.711, 623.79, 623.917, 636.234,
647.918, 692.832, 693.847, 694.32, 779.936};
begin("Zn absorption",false);
for(int i=0; i < Zn.length; ++i) {
draw((Zn[i],0)--(Zn[i],height),width+squarecap);
}
end();
begin("Zn emission",false);
for(int i=0; i < Zn.length; ++i) {
draw((Zn[i],0)--(Zn[i],-height),width+nm2rgb(Zn[i],false)+squarecap);
}
end();
shipout(bbox(2mm,Fill(white)));
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