make histogram bins work with date strings

src/plots/cartesian/axes.js

@@ -518,15 +518,17 @@ axes.autoBin = function(data, ax, nbins, is2d) {
     if(ax.type === 'log') {
         dummyax = {
             type: 'linear',
-            range: [datamin, datamax]
+            range: [datamin, datamax],
+            r2l: Number
         };
     }
     else {
         dummyax = {
             type: ax.type,
             // conversion below would be ax.c2r but that's only different from l2r
             // for log, and this is the only place (so far?) we would want c2r.
-            range: [datamin, datamax].map(ax.l2r)
+            range: [datamin, datamax].map(ax.l2r),
+            r2l: ax.r2l
         };
     }
 
@@ -593,8 +595,8 @@ axes.autoBin = function(data, ax, nbins, is2d) {
     }
 
     return {
-        start: binstart,
-        end: binend,
+        start: ax.c2r(binstart),
+        end: ax.c2r(binend),
         size: dummyax.dtick
     };
 };

src/plots/cartesian/set_convert.js

@@ -237,6 +237,9 @@ module.exports = function setConvert(ax) {
     ax.r2p = function(v, clip) { return ax.l2p(ax.r2l(v, clip)); };
     ax.p2r = function(px) { return ax.l2r(ax.p2l(px)); };
 
+    ax.r2c = function(v) { return ax.l2c(ax.r2l(v)); };
+    ax.c2r = function(v) { return ax.l2r(ax.c2l(v)); };
+
     if(['linear', 'log', '-'].indexOf(ax.type) !== -1) {
         ax.c2d = num;
         ax.d2c = Lib.cleanNumber;

src/traces/heatmap/calc.js

@@ -108,9 +108,9 @@ module.exports = function calc(gd, trace) {
 
     // create arrays of brick boundaries, to be used by autorange and heatmap.plot
     var xlen = maxRowLength(z),
-        xIn = trace.xtype === 'scaled' ? '' : trace.x,
+        xIn = trace.xtype === 'scaled' ? '' : x,
         xArray = makeBoundArray(trace, xIn, x0, dx, xlen, xa),
-        yIn = trace.ytype === 'scaled' ? '' : trace.y,
+        yIn = trace.ytype === 'scaled' ? '' : y,
         yArray = makeBoundArray(trace, yIn, y0, dy, z.length, ya);
 
     // handled in gl2d convert step
@@ -180,7 +180,6 @@ function makeBoundArray(trace, arrayIn, v0In, dvIn, numbricks, ax) {
     var isArrayOfTwoItemsOrMore = Array.isArray(arrayIn) && arrayIn.length > 1;
 
     if(isArrayOfTwoItemsOrMore && !isHist && (ax.type !== 'category')) {
-        arrayIn = arrayIn.map(ax.d2c);
         var len = arrayIn.length;
 
         // given vals are brick centers
@@ -223,7 +222,7 @@ function makeBoundArray(trace, arrayIn, v0In, dvIn, numbricks, ax) {
     else {
         dv = dvIn || 1;
 
-        if(isHist || ax.type === 'category') v0 = v0In || 0;
+        if(isHist || ax.type === 'category') v0 = ax.r2c(v0In) || 0;
         else if(Array.isArray(arrayIn) && arrayIn.length === 1) v0 = arrayIn[0];
         else if(v0In === undefined) v0 = 0;
         else v0 = ax.d2c(v0In);

src/traces/histogram/attributes.js

@@ -73,7 +73,7 @@ module.exports = {
 
     autobinx: {
         valType: 'boolean',
-        dflt: true,
+        dflt: null,
         role: 'style',
         description: [
             'Determines whether or not the x axis bin attributes are picked',
@@ -97,7 +97,7 @@ module.exports = {
 
     autobiny: {
         valType: 'boolean',
-        dflt: true,
+        dflt: null,
         role: 'style',
         description: [
             'Determines whether or not the y axis bin attributes are picked',
@@ -135,7 +135,7 @@ module.exports = {
 function makeBinsAttr(axLetter) {
     return {
         start: {
-            valType: 'number',
+            valType: 'any', // for date axes
             dflt: null,
             role: 'style',
             description: [
@@ -144,7 +144,7 @@ function makeBinsAttr(axLetter) {
             ].join(' ')
         },
         end: {
-            valType: 'number',
+            valType: 'any', // for date axes
             dflt: null,
             role: 'style',
             description: [
@@ -154,7 +154,7 @@ function makeBinsAttr(axLetter) {
         },
         size: {
             valType: 'any', // for date axes
-            dflt: 1,
+            dflt: null,
             role: 'style',
             description: [
                 'Sets the step in-between value each', axLetter,

src/traces/histogram/bin_defaults.js

@@ -14,14 +14,17 @@ module.exports = function handleBinDefaults(traceIn, traceOut, coerce, binDirect
     coerce('histnorm');
 
     binDirections.forEach(function(binDirection) {
-        // data being binned - note that even though it's a little weird,
-        // it's possible to have bins without data, if there's inferred data
-        var binstrt = coerce(binDirection + 'bins.start'),
-            binend = coerce(binDirection + 'bins.end'),
-            autobin = coerce('autobin' + binDirection, !(binstrt && binend));
-
-        if(autobin) coerce('nbins' + binDirection);
-        else coerce(binDirection + 'bins.size');
+        /*
+         * Because date axes have string values for start and end,
+         * and string options for size, we cannot validate these attributes
+         * now. We will do this during calc (immediately prior to binning)
+         * in ./clean_bins, and push the cleaned values back to _fullData.
+         */
+        coerce(binDirection + 'bins.start');
+        coerce(binDirection + 'bins.end');
+        coerce(binDirection + 'bins.size');
+        coerce('autobin' + binDirection);
+        coerce('nbins' + binDirection);
     });
 
     return traceOut;

src/traces/histogram/calc.js

@@ -17,6 +17,7 @@ var Axes = require('../../plots/cartesian/axes');
 var binFunctions = require('./bin_functions');
 var normFunctions = require('./norm_functions');
 var doAvg = require('./average');
+var cleanBins = require('./clean_bins');
 
 
 module.exports = function calc(gd, trace) {
@@ -33,6 +34,8 @@ module.exports = function calc(gd, trace) {
         maindata = trace.orientation === 'h' ? 'y' : 'x',
         counterdata = {x: 'y', y: 'x'}[maindata];
 
+    cleanBins(trace, pa, maindata);
+
     // prepare the raw data
     var pos0 = pa.makeCalcdata(trace, maindata);
     // calculate the bins
@@ -71,10 +74,11 @@ module.exports = function calc(gd, trace) {
 
     // create the bins (and any extra arrays needed)
     // assume more than 5000 bins is an error, so we don't crash the browser
-    i = binspec.start;
+    i = pa.r2c(binspec.start);
+
     // decrease end a little in case of rounding errors
-    binend = binspec.end +
-        (binspec.start - Axes.tickIncrement(binspec.start, binspec.size)) / 1e6;
+    binend = pa.r2c(binspec.end) + (i - Axes.tickIncrement(i, binspec.size)) / 1e6;
+
     while(i < binend && pos.length < 5000) {
         i2 = Axes.tickIncrement(i, binspec.size);
         pos.push((i + i2) / 2);

src/traces/histogram/clean_bins.js

@@ -0,0 +1,73 @@
+/**
+* Copyright 2012-2016, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+
+'use strict';
+var isNumeric = require('fast-isnumeric');
+var cleanDate = require('../../lib').cleanDate;
+var ONEDAY = require('../../constants/numerical').ONEDAY;
+
+/*
+ * cleanBins: validate attributes autobin[xy] and [xy]bins.(start, end, size)
+ * Mutates trace so all these attributes are valid.
+ *
+ * Normally this kind of thing would happen during supplyDefaults, but
+ * in this case we need to know the axis type, and axis type isn't set until
+ * after trace supplyDefaults are completed. So this gets called during the
+ * calc step, when data are inserted into bins.
+ */
+module.exports = function cleanBins(trace, ax, binDirection) {
+    var axType = ax.type,
+        binAttr = binDirection + 'bins',
+        bins = trace[binAttr];
+
+    if(!bins) bins = trace[binAttr] = {};
+
+    var cleanBound = (axType === 'date') ?
+        function(v) { return (v || v === 0) ? cleanDate(v) : null; } :
+        function(v) { return isNumeric(v) ? Number(v) : null; };
+
+    bins.start = cleanBound(bins.start);
+    bins.end = cleanBound(bins.end);
+
+    // logic for bin size is very similar to dtick (cartesian/tick_value_defaults)
+    // but without the extra string options for log axes
+    // ie the only strings we accept are M<n> for months
+    var sizeDflt = (axType === 'date') ? ONEDAY : 1,
+        binSize = bins.size;
+
+    if(isNumeric(binSize)) {
+        bins.size = (binSize > 0) ? Number(binSize) : sizeDflt;
+    }
+    else if(typeof binSize !== 'string') {
+        bins.size = sizeDflt;
+    }
+    else {
+        // date special case: "M<n>" gives bins every (integer) n months
+        var prefix = binSize.charAt(0),
+            sizeNum = binSize.substr(1);
+
+        sizeNum = isNumeric(sizeNum) ? Number(sizeNum) : 0;
+        if((sizeNum <= 0) || !(
+                axType === 'date' && prefix === 'M' && sizeNum === Math.round(sizeNum)
+            )) {
+            bins.size = sizeDflt;
+        }
+    }
+
+    var autoBinAttr = 'autobin' + binDirection;
+
+    if(typeof trace[autoBinAttr] !== 'boolean') {
+        trace[autoBinAttr] = !(
+            (bins.start || bins.start === 0) &&
+            (bins.end || bins.end === 0)
+        );
+    }
+
+    if(!trace[autoBinAttr]) delete trace['nbins' + binDirection];
+};

src/traces/histogram2d/calc.js

@@ -15,6 +15,7 @@ var Axes = require('../../plots/cartesian/axes');
 var binFunctions = require('../histogram/bin_functions');
 var normFunctions = require('../histogram/norm_functions');
 var doAvg = require('../histogram/average');
+var cleanBins = require('../histogram/clean_bins');
 
 
 module.exports = function calc(gd, trace) {
@@ -29,6 +30,9 @@ module.exports = function calc(gd, trace) {
         z,
         i;
 
+    cleanBins(trace, xa, 'x');
+    cleanBins(trace, ya, 'y');
+
     var serieslen = Math.min(x.length, y.length);
     if(x.length > serieslen) x.splice(serieslen, x.length - serieslen);
     if(y.length > serieslen) y.splice(serieslen, y.length - serieslen);
@@ -38,8 +42,10 @@ module.exports = function calc(gd, trace) {
     if(trace.autobinx || !('xbins' in trace)) {
         trace.xbins = Axes.autoBin(x, xa, trace.nbinsx, '2d');
         if(trace.type === 'histogram2dcontour') {
-            trace.xbins.start -= trace.xbins.size;
-            trace.xbins.end += trace.xbins.size;
+            // the "true" last argument reverses the tick direction (which we can't
+            // just do with a minus sign because of month bins)
+            trace.xbins.start = xa.c2r(Axes.tickIncrement(xa.r2c(trace.xbins.start), trace.xbins.size, true));
+            trace.xbins.end = xa.c2r(Axes.tickIncrement(xa.r2c(trace.xbins.end), trace.xbins.size));
         }
 
         // copy bin info back to the source data.
@@ -48,8 +54,8 @@ module.exports = function calc(gd, trace) {
     if(trace.autobiny || !('ybins' in trace)) {
         trace.ybins = Axes.autoBin(y, ya, trace.nbinsy, '2d');
         if(trace.type === 'histogram2dcontour') {
-            trace.ybins.start -= trace.ybins.size;
-            trace.ybins.end += trace.ybins.size;
+            trace.ybins.start = ya.c2r(Axes.tickIncrement(ya.r2c(trace.ybins.start), trace.ybins.size, true));
+            trace.ybins.end = ya.c2r(Axes.tickIncrement(ya.r2c(trace.ybins.end), trace.ybins.size));
         }
         trace._input.ybins = trace.ybins;
     }
@@ -91,11 +97,11 @@ module.exports = function calc(gd, trace) {
 
     // decrease end a little in case of rounding errors
     var binspec = trace.xbins,
-        binend = binspec.end +
-            (binspec.start - Axes.tickIncrement(binspec.start, binspec.size)) / 1e6;
+        binStart = xa.r2c(binspec.start),
+        binEnd = xa.r2c(binspec.end) +
+            (binStart - Axes.tickIncrement(binStart, binspec.size)) / 1e6;
 
-    for(i = binspec.start; i < binend;
-            i = Axes.tickIncrement(i, binspec.size)) {
+    for(i = binStart; i < binEnd; i = Axes.tickIncrement(i, binspec.size)) {
         onecol.push(sizeinit);
         if(Array.isArray(xbins)) xbins.push(i);
         if(doavg) zerocol.push(0);
@@ -104,15 +110,16 @@ module.exports = function calc(gd, trace) {
 
     var nx = onecol.length;
     x0 = trace.xbins.start;
-    dx = (i - x0) / nx;
-    x0 += dx / 2;
+    var x0c = xa.r2c(x0);
+    dx = (i - x0c) / nx;
+    x0 = xa.c2r(x0c + dx / 2);
 
     binspec = trace.ybins;
-    binend = binspec.end +
-        (binspec.start - Axes.tickIncrement(binspec.start, binspec.size)) / 1e6;
+    binStart = ya.r2c(binspec.start);
+    binEnd = ya.r2c(binspec.end) +
+        (binStart - Axes.tickIncrement(binStart, binspec.size)) / 1e6;
 
-    for(i = binspec.start; i < binend;
-            i = Axes.tickIncrement(i, binspec.size)) {
+    for(i = binStart; i < binEnd; i = Axes.tickIncrement(i, binspec.size)) {
         z.push(onecol.concat());
         if(Array.isArray(ybins)) ybins.push(i);
         if(doavg) counts.push(zerocol.concat());
@@ -121,8 +128,9 @@ module.exports = function calc(gd, trace) {
 
     var ny = z.length;
     y0 = trace.ybins.start;
-    dy = (i - y0) / ny;
-    y0 += dy / 2;
+    var y0c = ya.r2c(y0);
+    dy = (i - y0c) / ny;
+    y0 = ya.c2r(y0c + dy / 2);
 
     if(densitynorm) {
         xinc = onecol.map(function(v, i) {