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gpertea |
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/* |
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* clrutils.cpp |
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* |
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* Created on: Sep 16, 2008 |
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* Author: gpertea |
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*/ |
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/*================== useful rgb <-> hls utility functions I should put |
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in a separate module |
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*/ |
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#include "clrutils.h" |
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#include "GBase.h" |
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inline double h_value(double n1, double n2, double hue) { |
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if (hue<0) hue += 360; |
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if (hue>360) hue -= 360; |
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if (hue<60) return n1+(n2-n1)*hue/60.; |
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else if (hue<180) return n2; |
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else if (hue<240) |
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return n1+(n2-n1)*(240-hue)/60.; |
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else |
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return n1; |
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} |
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FXColor hls2rgb(int &H, int &L, int &S) { |
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double h,l,s; |
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double r,g,b,m1,m2; |
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h = ((double)H)/255. * 360; |
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l = ((double)L)/255.; |
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s = ((double)S)/255.; |
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if (l<.5) m2 = l*(1+s); |
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else m2 = l+s-l*s; |
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m1 = 2*l-m2; |
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if (s==0) { |
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r=l; |
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g=l; |
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b=l; |
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} |
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else { |
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r=h_value(m1,m2,h+120); |
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g=h_value(m1,m2,h); |
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b=h_value(m1,m2,h-120); |
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} |
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return FXRGB((int)(r*255), (int)(g*255), (int)(b*255)); |
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} |
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void rgb2hls(FXColor color, int &H, int &L, int &S) { |
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double r,g,b; |
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double h,l,s,min,max,delta; |
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r = ((double)FXREDVAL(color)) / 255. ; |
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g = ((double)FXGREENVAL(color)) / 255. ; |
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b = ((double)FXBLUEVAL(color)) / 255. ; |
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min = FXMIN3(r,g,b); |
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max = FXMAX3(r,g,b); |
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l = (max+min)/2; |
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if (max==min) { |
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s = 0; |
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h = 0; |
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} |
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else { |
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if (l<=0.5) s = (max-min)/(max+min); |
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else s = (max-min)/(2-max-min); |
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delta = max-min; |
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if (r==max) h=(g-b)/delta; |
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else if (g==max) h=2+(b-r)/delta; |
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else h=4+(r-g)/delta; |
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h /= 6.; |
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if (h<0) h ++; |
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} |
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H = iround(h*255.0); |
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L = iround(l*255.0); |
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S = iround(s*255.0); |
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} |
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//adjust h,l,s values for a color |
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FXColor modhls (FXColor src, int h, int l, int s) { |
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int H,L,S; |
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rgb2hls(src, H, L, S); |
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H+=h;L+=l;S+=s; |
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if (H>255) H %= 255; |
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//H=FXCLAMP(0,H,255); |
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L=FXCLAMP(0,L,255); |
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S=FXCLAMP(0,S,255); |
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return hls2rgb(H,L,S); |
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} |
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FXColor getRColor(FXColor base, int range, int i) { |
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int hstep=255/(range>>2); |
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if (hstep>70) hstep=70; |
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if (hstep<10) hstep=35; |
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return modhls(base,hstep*(i+1), (i/(range>>2))*10, (i/(range>>2)*12)); |
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} |
