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55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
dojo.provide("dojox.charting.scaler.common");
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(function(){
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var eq = function(/*Number*/ a, /*Number*/ b){
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// summary: compare two FP numbers for equality
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return Math.abs(a - b) <= 1e-6 * (Math.abs(a) + Math.abs(b)); // Boolean
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};
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dojo.mixin(dojox.charting.scaler.common, {
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findString: function(/*String*/ val, /*Array*/ text){
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val = val.toLowerCase();
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for(var i = 0; i < text.length; ++i){
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if(val == text[i]){ return true; }
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}
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return false;
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},
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getNumericLabel: function(/*Number*/ number, /*Number*/ precision, /*Object*/ kwArgs){
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var def = kwArgs.fixed ?
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number.toFixed(precision < 0 ? -precision : 0) :
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number.toString();
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if(kwArgs.labelFunc){
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var r = kwArgs.labelFunc(def, number, precision);
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if(r){ return r; }
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// else fall through to the regular labels search
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}
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if(kwArgs.labels){
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// classic binary search
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var l = kwArgs.labels, lo = 0, hi = l.length;
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while(lo < hi){
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var mid = Math.floor((lo + hi) / 2), val = l[mid].value;
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if(val < number){
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lo = mid + 1;
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}else{
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hi = mid;
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}
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}
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// lets take into account FP errors
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if(lo < l.length && eq(l[lo].value, number)){
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return l[lo].text;
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}
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--lo;
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if(lo >= 0 && lo < l.length && eq(l[lo].value, number)){
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return l[lo].text;
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}
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lo += 2;
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if(lo < l.length && eq(l[lo].value, number)){
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return l[lo].text;
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}
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// otherwise we will produce a number
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}
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return def;
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}
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});
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})();
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