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scaler.js
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scaler.js
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if(!dojo._hasResource["dojox.charting.scaler"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.charting.scaler"] = true;
dojo.provide("dojox.charting.scaler");
(function(){
var deltaLimit = 3; // pixels
var isText = function(val, text){
val = val.toLowerCase();
for(var i = 0; i < text.length; ++i){
if(val == text[i]){ return true; }
}
return false;
};
var calcTicks = function(min, max, kwArgs, majorTick, minorTick, microTick, span){
kwArgs = dojo.clone(kwArgs);
if(!majorTick){
if(kwArgs.fixUpper == "major"){ kwArgs.fixUpper = "minor"; }
if(kwArgs.fixLower == "major"){ kwArgs.fixLower = "minor"; }
}
if(!minorTick){
if(kwArgs.fixUpper == "minor"){ kwArgs.fixUpper = "micro"; }
if(kwArgs.fixLower == "minor"){ kwArgs.fixLower = "micro"; }
}
if(!microTick){
if(kwArgs.fixUpper == "micro"){ kwArgs.fixUpper = "none"; }
if(kwArgs.fixLower == "micro"){ kwArgs.fixLower = "none"; }
}
var lowerBound = isText(kwArgs.fixLower, ["major"]) ?
Math.floor(min / majorTick) * majorTick :
isText(kwArgs.fixLower, ["minor"]) ?
Math.floor(min / minorTick) * minorTick :
isText(kwArgs.fixLower, ["micro"]) ?
Math.floor(min / microTick) * unit : min,
upperBound = isText(kwArgs.fixUpper, ["major"]) ?
Math.ceil(max / majorTick) * majorTick :
isText(kwArgs.fixUpper, ["minor"]) ?
Math.ceil(max / minorTick) * minorTick :
isText(kwArgs.fixUpper, ["unit"]) ?
Math.ceil(max / unit) * unit : max,
majorStart = (isText(kwArgs.fixLower, ["major"]) || !majorTick) ?
lowerBound : Math.ceil(lowerBound / majorTick) * majorTick,
minorStart = (isText(kwArgs.fixLower, ["major", "minor"]) || !minorTick) ?
lowerBound : Math.ceil(lowerBound / minorTick) * minorTick,
microStart = (isText(kwArgs.fixLower, ["major", "minor", "micro"]) || ! microTick) ?
lowerBound : Math.ceil(lowerBound / microTick) * microTick,
majorCount = !majorTick ? 0 : (isText(kwArgs.fixUpper, ["major"]) ?
Math.round((upperBound - majorStart) / majorTick) :
Math.floor((upperBound - majorStart) / majorTick)) + 1,
minorCount = !minorTick ? 0 : (isText(kwArgs.fixUpper, ["major", "minor"]) ?
Math.round((upperBound - minorStart) / minorTick) :
Math.floor((upperBound - minorStart) / minorTick)) + 1,
microCount = !microTick ? 0 : (isText(kwArgs.fixUpper, ["major", "minor", "micro"]) ?
Math.round((upperBound - microStart) / microTick) :
Math.floor((upperBound - microStart) / microTick)) + 1,
minorPerMajor = minorTick ? Math.round(majorTick / minorTick) : 0,
microPerMinor = microTick ? Math.round(minorTick / microTick) : 0,
majorPrecision = majorTick ? Math.floor(Math.log(majorTick) / Math.LN10) : 0,
minorPrecision = minorTick ? Math.floor(Math.log(minorTick) / Math.LN10) : 0,
scale = span / (upperBound - lowerBound);
if(!isFinite(scale)){ scale = 1; }
return {
bounds: {
lower: lowerBound,
upper: upperBound
},
major: {
tick: majorTick,
start: majorStart,
count: majorCount,
prec: majorPrecision
},
minor: {
tick: minorTick,
start: minorStart,
count: minorCount,
prec: minorPrecision
},
micro: {
tick: microTick,
start: microStart,
count: microCount,
prec: 0
},
minorPerMajor: minorPerMajor,
microPerMinor: microPerMinor,
scale: scale
};
};
dojox.charting.scaler = function(min, max, span, kwArgs){
var h = {fixUpper: "none", fixLower: "none", natural: false};
if(kwArgs){
if("fixUpper" in kwArgs){ h.fixUpper = String(kwArgs.fixUpper); }
if("fixLower" in kwArgs){ h.fixLower = String(kwArgs.fixLower); }
if("natural" in kwArgs){ h.natural = Boolean(kwArgs.natural); }
}
if(max <= min){
return calcTicks(min, max, h, 0, 0, 0, span); // Object
}
var mag = Math.floor(Math.log(max - min) / Math.LN10),
major = kwArgs && ("majorTick" in kwArgs) ? kwArgs.majorTick : Math.pow(10, mag),
minor = 0, micro = 0, ticks;
// calculate minor ticks
if(kwArgs && ("minorTick" in kwArgs)){
minor = kwArgs.minorTick;
}else{
do{
minor = major / 10;
if(!h.natural || minor > 0.9){
ticks = calcTicks(min, max, h, major, minor, 0, span);
if(ticks.scale * ticks.minor.tick > deltaLimit){ break; }
}
minor = major / 5;
if(!h.natural || minor > 0.9){
ticks = calcTicks(min, max, h, major, minor, 0, span);
if(ticks.scale * ticks.minor.tick > deltaLimit){ break; }
}
minor = major / 2;
if(!h.natural || minor > 0.9){
ticks = calcTicks(min, max, h, major, minor, 0, span);
if(ticks.scale * ticks.minor.tick > deltaLimit){ break; }
}
return calcTicks(min, max, h, major, 0, 0, span); // Object
}while(false);
}
// calculate micro ticks
if(kwArgs && ("microTick" in kwArgs)){
micro = kwArgs.microTick;
ticks = calcTicks(min, max, h, major, minor, micro, span);
}else{
do{
micro = minor / 10;
if(!h.natural || micro > 0.9){
ticks = calcTicks(min, max, h, major, minor, micro, span);
if(ticks.scale * ticks.micro.tick > deltaLimit){ break; }
}
micro = minor / 5;
if(!h.natural || micro > 0.9){
ticks = calcTicks(min, max, h, major, minor, micro, span);
if(ticks.scale * ticks.micro.tick > deltaLimit){ break; }
}
micro = minor / 2;
if(!h.natural || micro > 0.9){
ticks = calcTicks(min, max, h, major, minor, micro, span);
if(ticks.scale * ticks.micro.tick > deltaLimit){ break; }
}
micro = 0;
}while(false);
}
return micro ? ticks : calcTicks(min, max, h, major, minor, 0, span); // Object
};
})();
}

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