/
controller.bubble.js
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/
controller.bubble.js
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import DatasetController from '../core/core.datasetController';
import {resolveObjectKey, valueOrDefault} from '../helpers/helpers.core';
export default class BubbleController extends DatasetController {
initialize() {
this.enableOptionSharing = true;
super.initialize();
}
/**
* Parse array of objects
* @protected
*/
parseObjectData(meta, data, start, count) {
const {xScale, yScale} = meta;
const {xAxisKey = 'x', yAxisKey = 'y'} = this._parsing;
const parsed = [];
let i, ilen, item;
for (i = start, ilen = start + count; i < ilen; ++i) {
item = data[i];
parsed.push({
x: xScale.parse(resolveObjectKey(item, xAxisKey), i),
y: yScale.parse(resolveObjectKey(item, yAxisKey), i),
_custom: item && item.r && +item.r
});
}
return parsed;
}
/**
* @protected
*/
getMaxOverflow() {
const {data, _parsed} = this._cachedMeta;
let max = 0;
for (let i = data.length - 1; i >= 0; --i) {
max = Math.max(max, data[i].size() / 2, _parsed[i]._custom);
}
return max > 0 && max;
}
/**
* @protected
*/
getLabelAndValue(index) {
const meta = this._cachedMeta;
const {xScale, yScale} = meta;
const parsed = this.getParsed(index);
const x = xScale.getLabelForValue(parsed.x);
const y = yScale.getLabelForValue(parsed.y);
const r = parsed._custom;
return {
label: meta.label,
value: '(' + x + ', ' + y + (r ? ', ' + r : '') + ')'
};
}
update(mode) {
const points = this._cachedMeta.data;
// Update Points
this.updateElements(points, 0, points.length, mode);
}
updateElements(points, start, count, mode) {
const reset = mode === 'reset';
const {iScale, vScale} = this._cachedMeta;
const firstOpts = this.resolveDataElementOptions(start, mode);
const sharedOptions = this.getSharedOptions(firstOpts);
const includeOptions = this.includeOptions(mode, sharedOptions);
const iAxis = iScale.axis;
const vAxis = vScale.axis;
for (let i = start; i < start + count; i++) {
const point = points[i];
const parsed = !reset && this.getParsed(i);
const properties = {};
const iPixel = properties[iAxis] = reset ? iScale.getPixelForDecimal(0.5) : iScale.getPixelForValue(parsed[iAxis]);
const vPixel = properties[vAxis] = reset ? vScale.getBasePixel() : vScale.getPixelForValue(parsed[vAxis]);
properties.skip = isNaN(iPixel) || isNaN(vPixel);
if (includeOptions) {
properties.options = this.resolveDataElementOptions(i, point.active ? 'active' : mode);
if (reset) {
properties.options.radius = 0;
}
}
this.updateElement(point, i, properties, mode);
}
this.updateSharedOptions(sharedOptions, mode, firstOpts);
}
/**
* @param {number} index
* @param {string} [mode]
* @protected
*/
resolveDataElementOptions(index, mode) {
const parsed = this.getParsed(index);
let values = super.resolveDataElementOptions(index, mode);
// In case values were cached (and thus frozen), we need to clone the values
if (values.$shared) {
values = Object.assign({}, values, {$shared: false});
}
// Custom radius resolution
const radius = values.radius;
if (mode !== 'active') {
values.radius = 0;
}
values.radius += valueOrDefault(parsed && parsed._custom, radius);
return values;
}
}
BubbleController.id = 'bubble';
/**
* @type {any}
*/
BubbleController.defaults = {
datasetElementType: false,
dataElementType: 'point',
animations: {
numbers: {
type: 'number',
properties: ['x', 'y', 'borderWidth', 'radius']
}
}
};
/**
* @type {any}
*/
BubbleController.overrides = {
scales: {
x: {
type: 'linear'
},
y: {
type: 'linear'
}
},
plugins: {
tooltip: {
callbacks: {
title() {
// Title doesn't make sense for scatter since we format the data as a point
return '';
}
}
}
}
};