billboard.js
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Re-usable easy interface JavaScript chart library, based on D3 v4+
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JavaScript
/*!
* Copyright (c) 2017 ~ present NAVER Corp.
* billboard.js project is licensed under the MIT license
*
* billboard.js, JavaScript chart library
* https://naver.github.io/billboard.js/
*
* @version 4.0.1
*/
import { isArray, isObject, isNumber } from '../../../module/util/type-checks.js';
/**
* Copyright (c) 2017 ~ present NAVER Corp.
* billboard.js project is licensed under the MIT license
*/
var shapeCandlestickCommon = {
/**
* Generate shape drawing points
* @param {object} indices Indice data
* @param {boolean} isSub Subchart draw
* @returns {function}
*/
generateGetCandlestickPoints(indices, isSub = false) {
const $$ = this;
const axis = isSub ? $$.axis.subX : $$.axis.x;
const targetsNum = $$.getIndicesMax(indices) + 1;
const barW = $$.getBarW("candlestick", axis, targetsNum);
const x = $$.getShapeX(barW, indices, !!isSub);
const y = $$.getShapeY(!!isSub);
const shapeOffset = $$.getShapeOffset($$.isCandlestickType, indices, !!isSub);
const yScale = $$.getYScaleById.bind($$);
return (d, i) => {
const y0 = yScale.call($$, d.id, isSub)($$.getShapeYMin(d.id));
const offset = shapeOffset(d, i) || y0; // offset is for stacked bar chart
const width = isNumber(barW) ? barW : barW[d.id] || barW._$width;
const value = $$.getCandlestickData(d);
let points;
if (value && isNumber(value.open) && isNumber(value.close)) {
const posX = {
start: x(d),
end: 0
};
posX.end = posX.start + width;
const posY = {
start: y(value.open),
end: y(value.close)
};
const posLine = {
x: posX.start + (width / 2),
high: y(value.high),
low: y(value.low)
};
const offsetDelta = y0 - offset;
posY.start -= offsetDelta;
posY.end -= offsetDelta;
posLine.high -= offsetDelta;
posLine.low -= offsetDelta;
points = [
[posX.start, posY.start],
[posX.end, posY.end],
[posLine.x, posLine.low, posLine.high]
];
}
else {
points = [[0, 0], [0, 0], [0, 0, 0]];
}
return points;
};
},
/**
* Get candlestick data as object
* @param {object} param Data object
* @param {Array|object} param.value Data value
* @returns {object|null} Converted data object
* @private
*/
getCandlestickData({ value }) {
let d;
if (isArray(value)) {
const [open, high, low, close, volume = false] = value;
d = { open, high, low, close };
if (volume !== false) {
d.volume = volume;
}
}
else if (isObject(value)) {
d = { ...value };
}
if (d) {
d._isUp = d.close >= d.open;
}
return d || null;
}
};
export { shapeCandlestickCommon as default };