/
msToCentury.js
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/
msToCentury.js
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///////////////////////////////////////
// Custom Time Axis //
// ---------------- //
// - Allows for smooth scrolling at //
// smaller-than-millisecond zoom //
// levels //
// - Provides time axis labeling //
// see customTimeFormat //
// - Depends on underscore.js, d3.js //
///////////////////////////////////////
// USAGE
// ----------------
// xAxis = d3.svg.axis()
// .tickFormat(msToCentury.TickFormat)
// .tickValues(msToCentury.TickValues(xScale, width))
// .tickSubdivide(msToCentury.TickSubDivide(xScale, width))
// .scale(xScale).orient("bottom");
///////////////////////////////////////
msToCentury = function() {
var msToCentury = {};
var MIN_DISTANCE_BETWEEN_X_AXIS_LABELS = 100;
function dt (num) {
var newdate = new Date();
newdate.setTime(num);
return newdate;
}
function millisecond(val) {
var newdate = new Date();
newdate.setTime(roundDownToNearestTime(val, times.ms));
return newdate;
}
function roundUpToNearestTime(val, tim) {
return Math.ceil(val/tim) * tim;
}
function roundDownToNearestTime(val, tim) {
return Math.floor(val/tim) * tim;
}
function getNumberOfDaysInCurrentMonth(dat) {
var curmo = dat.getMonth();
var addYear;
if (( curmo + 1 ) / 12.0 >= 1.0) {
// we rolled over to the next year
addYear = dat.getFullYear() + 1;
} else {
addYear = dat.getFullYear();
}
var newdate = new Date(
addYear,
(curmo + 1) % 12,
1,
1,
1,
1,
1);
newdate = dt(newdate.getTime() - 4000000);
return newdate.getDate();
}
var times = {
ms: 1, //milliseconds
s: 1000, //seconds
m: 6e4, //minutes
h: 36e5, //hours
d: 864e5, //days
// These are approximations:
mo: 2592e6, //months
y: 31536e6, //years
};
msToCentury.times = times;
msToCentury.NumberOfDaysInYear = function (dat) {
var newdateStart = new Date(dat.getFullYear() , 0, 0);
var newdateEnd = new Date(dat.getFullYear() + 1, 0, 0);
var diff = newdateEnd.getTime() - newdateStart.getTime();
var oneDay = 1000 * 60 * 60 * 24;
return Math.floor(diff / oneDay);
};
msToCentury.TickFormat = function (ti) {
// custom formatting for x axis time
function timeFormat(formats) {
return function(date) {
var newdate = new Date();
newdate.setTime(date);
var i = formats.length - 1, f = formats[i];
while (!f[1](newdate)) f = formats[--i];
return f[0](newdate);
};
}
var customTimeFormat = timeFormat([
[ d3.time.format("%Y") , function() { return true; } ],
[ d3.time.format("%b") , function(d) { return d.getMonth(); } ],
[ function (d) { return d3.time.format("%a %-d")(d).toLowerCase(); } ,
function(d) { return d.getDate() != 1; } ],
[ d3.time.format("%H:00") , function(d) { return d.getHours(); } ],
[ d3.time.format("%H:%M") , function(d) { return d.getMinutes(); } ],
[ d3.time.format("%Ss") , function(d) { return d.getSeconds(); } ],
[ d3.time.format("%Lms") , function(d) { return d.getMilliseconds(); } ]
]);
return function() { return customTimeFormat(ti); }();
};
function onScreenSizeOfLabels(millisecondsPerLabel, screenWidth, distanceBtwnLabels) {
return millisecondsPerLabel * screenWidth / distanceBtwnLabels;
}
function findLevel(dom, wid) {
var numInDom = function (num) {
return num < dom[1] && num > dom[0];
};
for (var i = 0; i < rounding_scales.length; i++) {
var ro = rounding_scales[i];
var compr = onScreenSizeOfLabels(ro[0]*ro[1], wid, MIN_DISTANCE_BETWEEN_X_AXIS_LABELS);
if (dom[1] - dom[0] <= compr ) {
var result = makeTickRange(dom[0], dom[1], ro[1], ro[3], ro[2], ro[0]*ro[1], wid);
// filter this for only what is actually on-screen.
result = _.filter(result, numInDom);
return i;
}
}
return -1;
}
msToCentury.TickValues = function (scal, wid) {
var dom = scal.domain();
var lvl = findLevel(dom, wid);
// This should never occur if the zoom limits are correct
if (lvl === -1) {
return [1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11, 1e12, 1e13, 1e14];
}
var ro = rounding_scales[lvl];
var rng = makeTickRange(dom[0], dom[1], ro[1], ro[3], ro[2], ro[0]*ro[1], wid);
// filter this for only what is actually on-screen.
var result = _.filter(rng, function (num) {
return num < dom[1] && num > dom[0];
});
return result;
};
msToCentury.SubTickValues = function (scal, wid) {
var dom = scal.domain();
var lvl = findLevel(dom, wid);
// This should never occur if the zoom limits are correct
if (lvl === -1) {
return [1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11, 1e12, 1e13, 1e14];
}
var ro = rounding_scales[lvl];
var rng = makeTickRange(dom[0], dom[1], ro[1], ro[3], ro[2], ro[0]*ro[1], wid);
var res = [];
var numToInterpolate = msToCenturyTickSubDivide(scal, wid);
var whichToGet = d3.range(1, numToInterpolate);
var spaceBetweenMajorTicks = ro[0]*ro[1];
for (var b = 0; b < whichToGet.length; b++) {
res.push(rng[0] - whichToGet[b]*(spaceBetweenMajorTicks / numToInterpolate));
}
for (var i = 0; i < rng.length; i++) {
for (var c = 0; c < whichToGet.length; c++) {
res.push(rng[i] + whichToGet[c]*(spaceBetweenMajorTicks / numToInterpolate));
}
}
// filter this for only what is actually on-screen.
var result = _.filter(res, function (num) {
return num < dom[1] && num > dom[0];
});
return result;
};
function msToCenturyTickSubDivide(scal, wid) {
var dom = scal.domain();
var lvl = findLevel(dom, wid);
if (lvl === -1) { return 0; }
var baseSize = rounding_scales[lvl][1];
var tickSpace = rounding_ticks[baseSize];
return (baseSize / tickSpace);
}
function makeTickRange(start, end, increment, incrementOf, baseFunc, smallInc, wid) {
var startyear, endyear, curange;
if ( incrementOf === d3.time.year ) {
startyear = d3.time.year.floor(dt(start));
endyear = d3.time.year.ceil( dt(end ));
curange = d3.range(startyear.getFullYear(), endyear.getFullYear());
// Filter for proper increments
curange = _.filter(curange, function (d) {
return d % increment === 0;
});
curange = _.map(curange, function (d) { return (new Date(d, 0)).getTime(); });
return curange;
} else if ( incrementOf === d3.time.month ) {
startyear = d3.time.year.floor(dt(start));
endyear = d3.time.year.ceil( dt(end ));
curange = d3.range(startyear.getFullYear(), endyear.getFullYear());
// for each year, get all of the months for it
curange = _.map(curange, function (d) {
return _.map([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ,11], function (f) {
// For each month of the year
return (new Date(d, f)).getTime();
});
});
curange = _.flatten(curange);
curange = _.filter(curange, function (d, i) {
// Filter for proper increments
return i % increment === 0;
});
return curange;
} else if (baseFunc === d3.time.month){
startyear = d3.time.year.floor(dt(start));
endyear = d3.time.year.ceil( dt(end ));
curange = d3.range(startyear.getFullYear(), endyear.getFullYear());
// For each year, get all of the months for it
curange = _.map(curange, function (year) {
return _.map([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ,11], function (month) {
// For each month of the year
var monthDays = getNumberOfDaysInCurrentMonth(new Date(year, month));
return _.map(d3.range(1, monthDays + 1), function (day) {
// For each day of the month
// Filter for proper increments
// and remove ones which are too close
// together near the ends of the months
if ((day - 1) % increment === 0 && monthDays + 1 - day >= increment ) {
return (new Date(year, month, day)).getTime();
} else {
return [];
}
});
});
});
curange = _.flatten(curange);
return curange;
} else { // For everything smaller than days
return d3.range( baseFunc.floor( dt(start) ).getTime(),
baseFunc.ceil( dt( end ) ).getTime(),
roundUpToNearestTime(
smallInc*MIN_DISTANCE_BETWEEN_X_AXIS_LABELS/wid,
smallInc));
}
}
// for major ticks every 'a' units,
// have a minor tick every 'b' units
// [a, b]
// b should always be a factor of a
var rounding_ticks = {
1 : 0.5, // when we are showing 1 of something, display a tick every 0.5
2 : 1 ,
3 : 1 ,
5 : 1 ,
6 : 3 , // when we are showing 6 of something, display a tick every 3
10 : 5 ,
12 : 3 ,
15 : 5 ,
20 : 5 ,
25 : 5 ,
30 : 10 ,
50 : 10 ,
100 : 50 ,
200 : 50 ,
500 : 100,
};
// Data object to help make custom axis' tick values
// [ estimate size in milliseconds,
// how many to increment,
// precise time rounder for anchoring,
// precise time rounder ]
var rounding_scales = [
[ times.ms , 1 , d3.time.second , millisecond],
[ times.ms , 2 , d3.time.second , millisecond],
[ times.ms , 5 , d3.time.second , millisecond],
[ times.ms , 10 , d3.time.second , millisecond],
[ times.ms , 20 , d3.time.second , millisecond],
[ times.ms , 50 , d3.time.second , millisecond],
[ times.ms , 100 , d3.time.second , millisecond],
[ times.ms , 200 , d3.time.second , millisecond],
[ times.ms , 500 , d3.time.second , millisecond],
[ times.s , 1 , d3.time.minute , d3.time.second],
[ times.s , 2 , d3.time.minute , d3.time.second],
[ times.s , 5 , d3.time.minute , d3.time.second],
[ times.s , 15 , d3.time.minute , d3.time.second],
[ times.s , 30 , d3.time.minute , d3.time.second],
[ times.m , 1 , d3.time.hour , d3.time.minute],
[ times.m , 2 , d3.time.hour , d3.time.minute],
[ times.m , 5 , d3.time.hour , d3.time.minute],
[ times.m , 15 , d3.time.hour , d3.time.minute],
[ times.m , 30 , d3.time.hour , d3.time.minute],
[ times.h , 1 , d3.time.day , d3.time.hour],
[ times.h , 3 , d3.time.day , d3.time.hour],
[ times.h , 6 , d3.time.day , d3.time.hour],
[ times.h , 12 , d3.time.day , d3.time.hour],
[ times.d , 1 , d3.time.month , d3.time.day],
[ times.d , 2 , d3.time.month , d3.time.day],
[ times.d , 5 , d3.time.month , d3.time.day],
[ times.d , 10 , d3.time.month , d3.time.day],
[ times.d , 15 , d3.time.month , d3.time.day],
[ times.mo , 1 , d3.time.year , d3.time.month],
[ times.mo , 2 , d3.time.year , d3.time.month],
[ times.mo , 3 , d3.time.year , d3.time.month],
[ times.mo , 6 , d3.time.year , d3.time.month],
[ times.mo , 12 , d3.time.year , d3.time.month],
[ times.y , 1 , d3.time.year , d3.time.year],
[ times.y , 2 , d3.time.year , d3.time.year],
[ times.y , 5 , d3.time.year , d3.time.year],
[ times.y , 10 , d3.time.year , d3.time.year],
[ times.y , 25 , d3.time.year , d3.time.year],
[ times.y , 50 , d3.time.year , d3.time.year],
[ times.y , 100, d3.time.year , d3.time.year],
[ times.y , 100, d3.time.year , d3.time.year],
];
return msToCentury;
}();