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Add support for floating bar chart ([start, end]) #6056

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merged 4 commits into from May 21, 2019
Merged

Add support for floating bar chart ([start, end]) #6056

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762dd88
FLoat-bar support.
gwyneblaidd Feb 8, 2019
7596f64
fix
gwyneblaidd Mar 20, 2019
c8f8e95
Docs + tests optimization
gwyneblaidd Apr 23, 2019
c8363f0
Changes as suggested by Simon.
gwyneblaidd May 13, 2019
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5 changes: 5 additions & 0 deletions docs/charts/bar.md
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Expand Up @@ -213,6 +213,11 @@ You can also specify the dataset as x/y coordinates when using the [time scale](
data: [{x:'2016-12-25', y:20}, {x:'2016-12-26', y:10}]
```

You can also specify the dataset for a bar chart as arrays of two numbers. This will force rendering of bars with gaps between them (floating-bars). First and second numbers in array will correspond the start and the end point of a bar respectively.
```javascript
data: [[5,6], [-3,-6]]
```

## Stacked Bar Chart

Bar charts can be configured into stacked bar charts by changing the settings on the X and Y axes to enable stacking. Stacked bar charts can be used to show how one data series is made up of a number of smaller pieces.
Expand Down
24 changes: 16 additions & 8 deletions src/controllers/controller.bar.js
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Expand Up @@ -162,6 +162,10 @@ module.exports = DatasetController.extend({
label: me.chart.data.labels[index]
};

if (helpers.isArray(dataset.data[index])) {
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rectangle._model.borderSkipped = null;
}

me._updateElementGeometry(rectangle, index, reset);

rectangle.pivot();
Expand Down Expand Up @@ -285,12 +289,13 @@ module.exports = DatasetController.extend({
var scale = me._getValueScale();
var isHorizontal = scale.isHorizontal();
var datasets = chart.data.datasets;
var value = +scale.getRightValue(datasets[datasetIndex].data[index]);
var value = scale._parseValue(datasets[datasetIndex].data[index]);
var minBarLength = scale.options.minBarLength;
var stacked = scale.options.stacked;
var stack = meta.stack;
var start = 0;
var i, imeta, ivalue, base, head, size;
var start = value.start === undefined ? 0 : value.max >= 0 && value.min >= 0 ? value.min : value.max;
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var length = value.start === undefined ? value.end : value.max >= 0 && value.min >= 0 ? value.max - value.min : value.min - value.max;
var i, imeta, ivalue, base, head, size, stackLength;

if (stacked || (stacked === undefined && stack !== undefined)) {
for (i = 0; i < datasetIndex; ++i) {
Expand All @@ -301,21 +306,23 @@ module.exports = DatasetController.extend({
imeta.controller._getValueScaleId() === scale.id &&
chart.isDatasetVisible(i)) {

ivalue = +scale.getRightValue(datasets[i].data[index]);
if ((value < 0 && ivalue < 0) || (value >= 0 && ivalue > 0)) {
stackLength = scale._parseValue(datasets[i].data[index]);
ivalue = stackLength.start === undefined ? stackLength.end : stackLength.min >= 0 && stackLength.max >= 0 ? stackLength.max : stackLength.min;

if ((value.min < 0 && ivalue < 0) || (value.max >= 0 && ivalue > 0)) {
start += ivalue;
}
}
}
}

base = scale.getPixelForValue(start);
head = scale.getPixelForValue(start + value);
head = scale.getPixelForValue(start + length);
size = head - base;

if (minBarLength !== undefined && Math.abs(size) < minBarLength) {
size = minBarLength;
if (value >= 0 && !isHorizontal || value < 0 && isHorizontal) {
if (length >= 0 && !isHorizontal || length < 0 && isHorizontal) {
head = base - minBarLength;
} else {
head = base + minBarLength;
Expand Down Expand Up @@ -366,7 +373,8 @@ module.exports = DatasetController.extend({
helpers.canvas.clipArea(chart.ctx, chart.chartArea);

for (; i < ilen; ++i) {
if (!isNaN(scale.getRightValue(dataset.data[i]))) {
var val = scale._parseValue(dataset.data[i]);
if (!isNaN(val.min) && !isNaN(val.max)) {
rects[i].draw();
}
}
Expand Down
40 changes: 40 additions & 0 deletions src/core/core.scale.js
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Expand Up @@ -523,6 +523,7 @@ module.exports = Element.extend({
if ((typeof rawValue === 'number' || rawValue instanceof Number) && !isFinite(rawValue)) {
return NaN;
}

// If it is in fact an object, dive in one more level
if (rawValue) {
if (this.isHorizontal()) {
Expand All @@ -538,6 +539,45 @@ module.exports = Element.extend({
return rawValue;
},

/**
* @private
*/
_parseValue: function(value) {
var start, end, min, max;

if (helpers.isArray(value)) {
start = +this.getRightValue(value[0]);
end = +this.getRightValue(value[1]);
min = Math.min(start, end);
max = Math.max(start, end);
} else {
value = +this.getRightValue(value);
start = undefined;
end = value;
min = value;
max = value;
}

return {
min: min,
max: max,
start: start,
end: end
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};
},

/**
* @private
*/
_getScaleLabel: function(rawValue) {
var v = this._parseValue(rawValue);
if (v.start !== undefined) {
return '[' + v.start + ', ' + v.end + ']';
}

return +this.getRightValue(rawValue);
},

/**
* Used to get the value to display in the tooltip for the data at the given index
* @param index
Expand Down
34 changes: 18 additions & 16 deletions src/scales/scale.linear.js
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Expand Up @@ -70,20 +70,25 @@ module.exports = LinearScaleBase.extend({

if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
helpers.each(dataset.data, function(rawValue, index) {
var value = +me.getRightValue(rawValue);
if (isNaN(value) || meta.data[index].hidden) {
var value = me._parseValue(rawValue);

if (isNaN(value.min) || isNaN(value.max) || meta.data[index].hidden) {
return;
}

positiveValues[index] = positiveValues[index] || 0;
negativeValues[index] = negativeValues[index] || 0;

if (value.min === 0 && !opts.ticks.beginAtZero) {
value.min = value.max;
}

if (opts.relativePoints) {
positiveValues[index] = 100;
} else if (value < 0) {
negativeValues[index] += value;
} else if (value.min < 0 || value.max < 0) {
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negativeValues[index] += value.min;
} else {
positiveValues[index] += value;
positiveValues[index] += value.max;
}
});
}
Expand All @@ -102,21 +107,18 @@ module.exports = LinearScaleBase.extend({
var meta = chart.getDatasetMeta(datasetIndex);
if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
helpers.each(dataset.data, function(rawValue, index) {
var value = +me.getRightValue(rawValue);
if (isNaN(value) || meta.data[index].hidden) {
var value = me._parseValue(rawValue);

if (isNaN(value.min) || isNaN(value.max) || meta.data[index].hidden) {
return;
}

if (me.min === null) {
me.min = value;
} else if (value < me.min) {
me.min = value;
if (me.min === null || value.min < me.min) {
me.min = value.min;
}

if (me.max === null) {
me.max = value;
} else if (value > me.max) {
me.max = value;
if (me.max === null || me.max < value.max) {
me.max = value.max;
}
});
}
Expand Down Expand Up @@ -151,7 +153,7 @@ module.exports = LinearScaleBase.extend({
},

getLabelForIndex: function(index, datasetIndex) {
return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
return this._getScaleLabel(this.chart.data.datasets[datasetIndex].data[index]);
},

// Utils
Expand Down
28 changes: 12 additions & 16 deletions src/scales/scale.logarithmic.js
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Expand Up @@ -118,13 +118,13 @@ module.exports = Scale.extend({

helpers.each(dataset.data, function(rawValue, index) {
var values = valuesPerStack[key];
var value = +me.getRightValue(rawValue);
var value = me._parseValue(rawValue);
// invalid, hidden and negative values are ignored
if (isNaN(value) || meta.data[index].hidden || value < 0) {
if (isNaN(value.min) || isNaN(value.max) || meta.data[index].hidden || value.min < 0 || value.max < 0) {
return;
}
values[index] = values[index] || 0;
values[index] += value;
values[index] += value.max;
});
}
});
Expand All @@ -143,26 +143,22 @@ module.exports = Scale.extend({
var meta = chart.getDatasetMeta(datasetIndex);
if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
helpers.each(dataset.data, function(rawValue, index) {
var value = +me.getRightValue(rawValue);
var value = me._parseValue(rawValue);
// invalid, hidden and negative values are ignored
if (isNaN(value) || meta.data[index].hidden || value < 0) {
if (isNaN(value.min) || isNaN(value.max) || meta.data[index].hidden || value.min < 0 || value.max < 0) {
return;
}

if (me.min === null) {
me.min = value;
} else if (value < me.min) {
me.min = value;
if (me.min === null || value.min < me.min) {
me.min = value.min;
}

if (me.max === null) {
me.max = value;
} else if (value > me.max) {
me.max = value;
if (me.max === null || me.max < value.max) {
me.max = value.max;
}

if (value !== 0 && (me.minNotZero === null || value < me.minNotZero)) {
me.minNotZero = value;
if (value.min !== 0 && (me.minNotZero === null || value.min < me.minNotZero)) {
me.minNotZero = value.min;
}
});
}
Expand Down Expand Up @@ -247,7 +243,7 @@ module.exports = Scale.extend({

// Get the correct tooltip label
getLabelForIndex: function(index, datasetIndex) {
return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
return this._getScaleLabel(this.chart.data.datasets[datasetIndex].data[index]);
},

getPixelForTick: function(index) {
Expand Down
41 changes: 41 additions & 0 deletions test/fixtures/controller.bar/floatBar/float-bar-horizontal.json
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@@ -0,0 +1,41 @@
{
"config": {
"type": "horizontalBar",
"data": {
"labels": ["2030", "2034", "2038", "2042"],
"datasets": [{
"backgroundColor": "#FF6384",
"data": [11, [6,2], [-4,-7], -2]
}, {
"backgroundColor": "#36A2EB",
"data": [[1,2], [3,4], [-2,-3], [1,4]]
}, {
"backgroundColor": "#FFCE56",
"data": [[0,1], [1,2], [-2,-1], [1,-7]]
}]
},
"options": {
"title": false,
"legend": false,
"scales": {
"xAxes": [{
"display": false,
"ticks": {
"min": -8,
"max": 12
}
}],
"yAxes": [{
"display": false
}]
}
}
},
"debug": false,
"options": {
"canvas": {
"height": 256,
"width": 512
}
}
}
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43 changes: 43 additions & 0 deletions test/fixtures/controller.bar/floatBar/float-bar-stacked-horizontal.json
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@@ -0,0 +1,43 @@
{
"config": {
"type": "horizontalBar",
"data": {
"labels": ["2030", "2034", "2038", "2042"],
"datasets": [{
"backgroundColor": "#FF6384",
"data": [11, [6,2], [-4,-7], -2]
}, {
"backgroundColor": "#36A2EB",
"data": [[1,2], [3,4], [-2,-3], [1,4]]
}, {
"backgroundColor": "#FFCE56",
"data": [[0,1], [1,2], [-2,-1], [1,-7]]
}]
},
"options": {
"title": false,
"legend": false,
"scales": {
"xAxes": [{
"display": false,
"stacked": true
}],
"yAxes": [{
"display": false,
"stacked": true,
"ticks": {
"min": -8,
"max": 12
}
}]
}
}
},
"debug": false,
"options": {
"canvas": {
"height": 256,
"width": 512
}
}
}
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43 changes: 43 additions & 0 deletions test/fixtures/controller.bar/floatBar/float-bar-stacked.json
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@@ -0,0 +1,43 @@
{
"config": {
"type": "bar",
"data": {
"labels": ["2030", "2034", "2038", "2042"],
"datasets": [{
"backgroundColor": "#FF6384",
"data": [11, [6,2], [-4,-7], -2]
}, {
"backgroundColor": "#36A2EB",
"data": [[1,2], [3,4], [-2,-3], [1,4]]
}, {
"backgroundColor": "#FFCE56",
"data": [[0,1], [1,2], [-2,-1], [1,-7]]
}]
},
"options": {
"title": false,
"legend": false,
"scales": {
"xAxes": [{
"display": false,
"stacked": true,
"ticks": {
"min": -8,
"max": 12
}
}],
"yAxes": [{
"display": false,
"stacked": true
}]
}
}
},
"debug": false,
"options": {
"canvas": {
"height": 256,
"width": 512
}
}
}
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