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Fix time scale computeOffsets (#7072)
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@ -358,23 +358,23 @@ function generate(scale) {
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* They add extra margins on the both sides by scaling down the original scale.
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* Offsets are added when the `offset` option is true.
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*/
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function computeOffsets(table, ticks, min, max, options) {
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function computeOffsets(table, timestamps, min, max, options) {
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let start = 0;
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let end = 0;
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let first, last;
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if (options.offset && ticks.length) {
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first = interpolate(table, 'time', ticks[0], 'pos');
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if (ticks.length === 1) {
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if (options.offset && timestamps.length) {
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first = interpolate(table, 'time', timestamps[0], 'pos');
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if (timestamps.length === 1) {
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start = 1 - first;
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} else {
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start = (interpolate(table, 'time', ticks[1], 'pos') - first) / 2;
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start = (interpolate(table, 'time', timestamps[1], 'pos') - first) / 2;
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}
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last = interpolate(table, 'time', ticks[ticks.length - 1], 'pos');
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if (ticks.length === 1) {
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last = interpolate(table, 'time', timestamps[timestamps.length - 1], 'pos');
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if (timestamps.length === 1) {
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end = last;
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} else {
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end = (last - interpolate(table, 'time', ticks[ticks.length - 2], 'pos')) / 2;
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end = (last - interpolate(table, 'time', timestamps[timestamps.length - 2], 'pos')) / 2;
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}
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}
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@ -626,7 +626,7 @@ class TimeScale extends Scale {
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me._majorUnit = !tickOpts.major.enabled || me._unit === 'year' ? undefined
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: determineMajorUnit(me._unit);
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me._table = buildLookupTable(getTimestampsForTable(me), min, max, distribution);
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me._offsets = computeOffsets(me._table, ticks, min, max, options);
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me._offsets = computeOffsets(me._table, getDataTimestamps(me), min, max, options);
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if (options.reverse) {
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ticks.reverse();
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@ -1317,7 +1317,7 @@ describe('Time scale tests', function() {
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this.chart = window.acquireChart({
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type: 'line',
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data: {
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labels: ['2017', '2019', '2020', '2025'],
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labels: ['2017', '2018', '2019', '2020', '2021'],
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datasets: [{data: [0, 1, 2, 3, 4]}]
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},
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options: {
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@ -1325,7 +1325,8 @@ describe('Time scale tests', function() {
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x: {
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type: 'time',
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time: {
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parser: 'YYYY'
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parser: 'YYYY',
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unit: 'year'
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},
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ticks: {
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source: source
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@ -1341,7 +1342,7 @@ describe('Time scale tests', function() {
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var scale = this.chart.scales.x;
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expect(scale.getPixelForValue(moment('2017').valueOf())).toBeCloseToPixel(scale.left);
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expect(scale.getPixelForValue(moment('2025').valueOf())).toBeCloseToPixel(scale.left + scale.width);
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expect(scale.getPixelForValue(moment('2021').valueOf())).toBeCloseToPixel(scale.left + scale.width);
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});
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it ('should add offset from the edges if offset is true', function() {
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@ -1357,7 +1358,7 @@ describe('Time scale tests', function() {
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var lastTickInterval = scale.getPixelForTick(numTicks - 1) - scale.getPixelForTick(numTicks - 2);
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expect(scale.getPixelForValue(moment('2017').valueOf())).toBeCloseToPixel(scale.left + firstTickInterval / 2);
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expect(scale.getPixelForValue(moment('2025').valueOf())).toBeCloseToPixel(scale.left + scale.width - lastTickInterval / 2);
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expect(scale.getPixelForValue(moment('2021').valueOf())).toBeCloseToPixel(scale.left + scale.width - lastTickInterval / 2);
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});
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it ('should not add offset if min and max extend the labels range', function() {
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@ -1430,8 +1431,8 @@ describe('Time scale tests', function() {
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this.chart = window.acquireChart({
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type: 'line',
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data: {
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labels: ['2017', '2019', '2020', '2025', '2042'],
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datasets: [{data: [0, 1, 2, 3, 4, 5]}]
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labels: ['2017', '2018', '2019', '2020', '2021'],
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datasets: [{data: [0, 1, 2, 3, 4]}]
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},
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options: {
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scales: {
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@ -1440,6 +1441,7 @@ describe('Time scale tests', function() {
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reverse: true,
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time: {
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parser: 'YYYY',
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unit: 'year'
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},
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ticks: {
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source: 'labels',
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@ -1456,13 +1458,13 @@ describe('Time scale tests', function() {
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it ('should reverse the labels', function() {
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var scale = this.chart.scales.x;
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expect(scale.getPixelForValue(moment('2017').valueOf())).toBeCloseToPixel(scale.left + scale.width);
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expect(scale.getPixelForValue(moment('2042').valueOf())).toBeCloseToPixel(scale.left);
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expect(scale.getPixelForValue(moment('2021').valueOf())).toBeCloseToPixel(scale.left);
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});
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it ('should reverse the values for pixels', function() {
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var scale = this.chart.scales.x;
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expect(scale.getValueForPixel(scale.left)).toBeCloseToTime({
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value: moment('2042-01-01T00:00:00'),
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value: moment('2021-01-01T00:00:00'),
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unit: 'hour',
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});
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expect(scale.getValueForPixel(scale.left + scale.width)).toBeCloseToTime({
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@ -1480,11 +1482,11 @@ describe('Time scale tests', function() {
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chart.update();
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var numTicks = scale.ticks.length;
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var firstTickInterval = scale.getPixelForTick(1) - scale.getPixelForTick(0);
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var lastTickInterval = scale.getPixelForTick(numTicks - 1) - scale.getPixelForTick(numTicks - 2);
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var firstTickInterval = scale.getPixelForTick(numTicks - 2) - scale.getPixelForTick(numTicks - 1);
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var lastTickInterval = scale.getPixelForTick(0) - scale.getPixelForTick(1);
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expect(scale.getPixelForValue(moment('2017').valueOf())).toBeCloseToPixel(scale.left + scale.width - lastTickInterval / 2);
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expect(scale.getPixelForValue(moment('2042').valueOf())).toBeCloseToPixel(scale.left + firstTickInterval / 2);
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expect(scale.getPixelForValue(moment('2021').valueOf())).toBeCloseToPixel(scale.left + firstTickInterval / 2);
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});
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it ('should reverse the values for pixels if offset is true', function() {
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@ -1496,12 +1498,12 @@ describe('Time scale tests', function() {
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chart.update();
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var numTicks = scale.ticks.length;
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var firstTickInterval = scale.getPixelForTick(1) - scale.getPixelForTick(0);
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var lastTickInterval = scale.getPixelForTick(numTicks - 1) - scale.getPixelForTick(numTicks - 2);
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var firstTickInterval = scale.getPixelForTick(numTicks - 2) - scale.getPixelForTick(numTicks - 1);
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var lastTickInterval = scale.getPixelForTick(0) - scale.getPixelForTick(1);
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expect(scale.getValueForPixel(scale.left + lastTickInterval / 2)).toBeCloseToTime({
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value: moment('2042-01-01T00:00:00'),
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unit: 'hour',
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value: moment('2021-01-01T00:00:00'),
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unit: 'year',
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});
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expect(scale.getValueForPixel(scale.left + scale.width - firstTickInterval / 2)).toBeCloseToTime({
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value: moment('2017-01-01T00:00:00'),
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