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Honour axis min/max settings #4522

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merged 2 commits into from Jul 22, 2017
Merged

Honour axis min/max settings #4522

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a8c8dc3
Honor axis min/max settings
andig Jul 18, 2017
45dde56
Fix typos
andig Jul 18, 2017
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20 changes: 16 additions & 4 deletions src/helpers/helpers.time.js
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Expand Up @@ -3,6 +3,8 @@
var moment = require('moment');
moment = typeof(moment) === 'function' ? moment : window.moment;

var helpers = require('./helpers.core');

var interval = {
millisecond: {
size: 1,
Expand Down Expand Up @@ -53,25 +55,35 @@ function generateTicksNiceRange(options, dataRange, niceRange) {
var ticks = [];
if (options.maxTicks) {
var stepSize = options.stepSize;
var startTick = options.min !== undefined ? options.min : niceRange.min;
var startTick = helpers.isNullOrUndef(options.min) ? niceRange.min : options.min;
var majorUnit = options.majorUnit;
var majorUnitStart = majorUnit ? moment(startTick).add(1, majorUnit).startOf(majorUnit) : startTick;
var startRange = majorUnitStart.valueOf() - startTick;
var stepValue = interval[options.unit].size * stepSize;
var startFraction = startRange % stepValue;
var alignedTick = startTick;
if (startFraction && majorUnit && !options.timeOpts.round && !options.timeOpts.isoWeekday) {

// first tick
if (startFraction && majorUnit && !options.timeOpts.round && !options.timeOpts.isoWeekday && helpers.isNullOrUndef(options.min)) {
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I agree that this if is dubious. I'm not sure why isoWeekday is doing things here.

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I can't quite tell what the isoWeekday option is supposed to do from the docs. Looking at the code it seems that perhaps that setting isoWeekday makes every tick a Monday. If you're manually setting each tick to a Monday then it'd make sense not to do smart alignment here, but it's quite difficult to tell what this option is. I tried to build a sample to test it out, but the time samples seem to be currently broken on master. After #4507 is merged I imagine the samples will be working again and then we can take a stab at better documenting that feature and seeing if we should remove isoWeekday here

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I'd leave it unchanged for now as removing it breaks this https://github.com/chartjs/Chart.js/blob/master/test/specs/scale.time.tests.js#L331 test. The test itself is odd as isoWeekDay should be a boolean but the tests uses numerical value.

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My understanding of isoWeekDay is that's a number representing the day (1: Monday - 7: Sunday) that should be considered the first day of the week and I guess that isoWeekDay: true is an alias to 1 (Monday).

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Then the docs are off: https://github.com/chartjs/Chart.js/blob/master/docs/axes/cartesian/time.md shows its boolean.

alignedTick += startFraction - stepValue;
ticks.push(alignedTick);
} else {
ticks.push(startTick);
}

// generate remaining ticks
var cur = moment(alignedTick);
var realMax = options.max || niceRange.max;
var realMax = helpers.isNullOrUndef(options.max) ? niceRange.max : options.max;
while (cur.add(stepSize, options.unit).valueOf() < realMax) {
ticks.push(cur.valueOf());
}
ticks.push(cur.valueOf());

// last tick
if (helpers.isNullOrUndef(options.max)) {
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minor question. could we always just push realMax at the end?

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You can't because cur.valueOf() > niceRange.max in this case, meaning that the last tick will be too early. Begs the question what niceRangeMax really is and where it comes from. Didn't look into this- the current change is minimally invasive.

ticks.push(cur.valueOf());
} else {
ticks.push(realMax);
}
}
return ticks;
}
Expand Down
14 changes: 7 additions & 7 deletions test/specs/scale.time.tests.js
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Expand Up @@ -43,17 +43,17 @@ describe('Time scale tests', function() {
});
});

it('Should load moment.js as a dependency', function() {
it('should load moment.js as a dependency', function() {
expect(window.moment).not.toBe(undefined);
});

it('Should register the constructor with the scale service', function() {
it('should register the constructor with the scale service', function() {
var Constructor = Chart.scaleService.getScaleConstructor('time');
expect(Constructor).not.toBe(undefined);
expect(typeof Constructor).toBe('function');
});

it('Should have the correct default config', function() {
it('should have the correct default config', function() {
var defaultConfig = Chart.scaleService.getScaleDefaults('time');
expect(defaultConfig).toEqual({
display: true,
Expand Down Expand Up @@ -315,7 +315,7 @@ describe('Time scale tests', function() {
config.time.min = '2014-12-29T04:00:00';

var scale = createScale(mockData, config);
expect(scale.ticks[0].value).toEqual('Dec 28');
expect(scale.ticks[0].value).toEqual('Dec 29');
});

it('should use the max option', function() {
Expand All @@ -324,11 +324,11 @@ describe('Time scale tests', function() {

var scale = createScale(mockData, config);

expect(scale.ticks[scale.ticks.length - 1].value).toEqual('Jan 6');
expect(scale.ticks[scale.ticks.length - 1].value).toEqual('Jan 5');
});
});

it('Should use the isoWeekday option', function() {
it('should use the isoWeekday option', function() {
var mockData = {
labels: [
'2015-01-01T20:00:00', // Thursday
Expand Down Expand Up @@ -420,7 +420,7 @@ describe('Time scale tests', function() {
var step = xScale.ticksAsTimestamps[1] - xScale.ticksAsTimestamps[0];
var stepsAmount = Math.floor((xScale.max - xScale.min) / step);

it('should be bounded by nearest step year starts', function() {
it('should be bounded by nearest step\'s year start and end', function() {
expect(xScale.getValueForPixel(xScale.left)).toBeCloseToTime({
value: moment(xScale.min).startOf('year'),
unit: 'hour',
Expand Down