forked from sheetjs/sheetjs
62 lines
2.2 KiB
JavaScript
62 lines
2.2 KiB
JavaScript
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var hex2RGB = function(h) {return h.substr(h[0]==="#"?1:0,6).match(/../g).map(function(x) { return parseInt(x,16); });};
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var rgb2Hex = function(rgb) {
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for(var i=0,o=1; i!=3; ++i) o = o*256 + (rgb[i]>255?255:rgb[i]<0?0:rgb[i]);
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return o.toString(16).toUpperCase().substr(1);
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};
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var rgb2HSL = function(rgb) {
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var R = rgb[0]/255, G = rgb[1]/255, B=rgb[2]/255;
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var M = Math.max(R, G, B), m = Math.min(R, G, B), C = M - m;
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if(C === 0) return [0, 0, R];
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var H6 = 0, S = 0, L2 = (M + m);
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S = C / (L2 > 1 ? 2 - L2 : L2);
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switch(M){
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case R: H6 = ((G - B) / C + 6)%6; break;
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case G: H6 = ((B - R) / C + 2); break;
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case B: H6 = ((R - G) / C + 4); break;
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}
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return [H6 / 6, S, L2 / 2];
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};
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var hsl2RGB = function(hsl){
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var H = hsl[0], S = hsl[1], L = hsl[2];
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var C = S * 2 * (L < 0.5 ? L : 1 - L), m = L - C/2;
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var rgb = [m,m,m], h6 = 6*H;
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var X;
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if(S !== 0) switch(h6|0) {
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case 0: case 6: X = C * h6; rgb[0] += C; rgb[1] += X; break;
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case 1: X = C * (2 - h6); rgb[0] += X; rgb[1] += C; break;
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case 2: X = C * (h6 - 2); rgb[1] += C; rgb[2] += X; break;
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case 3: X = C * (4 - h6); rgb[1] += X; rgb[2] += C; break;
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case 4: X = C * (h6 - 4); rgb[2] += C; rgb[0] += X; break;
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case 5: X = C * (6 - h6); rgb[2] += X; rgb[0] += C; break;
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}
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for(var i = 0; i != 3; ++i) rgb[i] = Math.round(rgb[i]*255);
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return rgb;
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};
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/* 18.8.3 bgColor tint algorithm */
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function rgb_tint(hex, tint) {
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if(tint === 0) return hex;
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var hsl = rgb2HSL(hex2RGB(hex));
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if (tint < 0) hsl[2] = hsl[2] * (1 + tint);
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else hsl[2] = 1 - (1 - hsl[2]) * (1 - tint);
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return rgb2Hex(hsl2RGB(hsl));
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}
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/* 18.3.1.13 width calculations */
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var DEF_MDW = 7, MAX_MDW = 15, MIN_MDW = 1, MDW = DEF_MDW;
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function width2px(width) { return (( width + ((128/MDW)|0)/256 )* MDW )|0; }
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function px2char(px) { return (((px - 5)/MDW * 100 + 0.5)|0)/100; }
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function char2width(chr) { return (((chr * MDW + 5)/MDW*256)|0)/256; }
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function cycle_width(collw) { return char2width(px2char(width2px(collw))); }
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function find_mdw(collw, coll) {
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if(cycle_width(collw) != collw) {
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for(MDW=DEF_MDW; MDW>MIN_MDW; --MDW) if(cycle_width(collw) === collw) break;
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if(MDW === MIN_MDW) for(MDW=DEF_MDW+1; MDW<MAX_MDW; ++MDW) if(cycle_width(collw) === collw) break;
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if(MDW === MAX_MDW) MDW = DEF_MDW;
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}
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}
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