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AxesUtils.js
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AxesUtils.js
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import Formatters from '../Formatters'
import Graphics from '../Graphics'
import CoreUtils from '../CoreUtils'
import DateTime from '../../utils/DateTime'
export default class AxesUtils {
constructor(ctx) {
this.ctx = ctx
this.w = ctx.w
}
// Based on the formatter function, get the label text and position
getLabel(
labels,
timescaleLabels,
x,
i,
drawnLabels = [],
fontSize = '12px',
isLeafGroup = true
) {
const w = this.w
let rawLabel = typeof labels[i] === 'undefined' ? '' : labels[i]
let label = rawLabel
let xlbFormatter = w.globals.xLabelFormatter
let customFormatter = w.config.xaxis.labels.formatter
let isBold = false
let xFormat = new Formatters(this.ctx)
let timestamp = rawLabel
if (isLeafGroup) {
label = xFormat.xLabelFormat(xlbFormatter, rawLabel, timestamp, {
i,
dateFormatter: new DateTime(this.ctx).formatDate,
w,
})
if (customFormatter !== undefined) {
label = customFormatter(rawLabel, labels[i], {
i,
dateFormatter: new DateTime(this.ctx).formatDate,
w,
})
}
}
const determineHighestUnit = (unit) => {
let highestUnit = null
timescaleLabels.forEach((t) => {
if (t.unit === 'month') {
highestUnit = 'year'
} else if (t.unit === 'day') {
highestUnit = 'month'
} else if (t.unit === 'hour') {
highestUnit = 'day'
} else if (t.unit === 'minute') {
highestUnit = 'hour'
}
})
return highestUnit === unit
}
if (timescaleLabels.length > 0) {
isBold = determineHighestUnit(timescaleLabels[i].unit)
x = timescaleLabels[i].position
label = timescaleLabels[i].value
} else {
if (w.config.xaxis.type === 'datetime' && customFormatter === undefined) {
label = ''
}
}
if (typeof label === 'undefined') label = ''
label = Array.isArray(label) ? label : label.toString()
let graphics = new Graphics(this.ctx)
let textRect = {}
if (w.globals.rotateXLabels && isLeafGroup) {
textRect = graphics.getTextRects(
label,
parseInt(fontSize, 10),
null,
`rotate(${w.config.xaxis.labels.rotate} 0 0)`,
false
)
} else {
textRect = graphics.getTextRects(label, parseInt(fontSize, 10))
}
const allowDuplicatesInTimeScale =
!w.config.xaxis.labels.showDuplicates && this.ctx.timeScale
if (
!Array.isArray(label) &&
(label.indexOf('NaN') === 0 ||
label.toLowerCase().indexOf('invalid') === 0 ||
label.toLowerCase().indexOf('infinity') >= 0 ||
(drawnLabels.indexOf(label) >= 0 && allowDuplicatesInTimeScale))
) {
label = ''
}
return {
x,
text: label,
textRect,
isBold,
}
}
checkLabelBasedOnTickamount(i, label, labelsLen) {
const w = this.w
let ticks = w.config.xaxis.tickAmount
if (ticks === 'dataPoints') ticks = Math.round(w.globals.gridWidth / 120)
if (ticks > labelsLen) return label
let tickMultiple = Math.round(labelsLen / (ticks + 1))
if (i % tickMultiple === 0) {
return label
} else {
label.text = ''
}
return label
}
checkForOverflowingLabels(
i,
label,
labelsLen,
drawnLabels,
drawnLabelsRects
) {
const w = this.w
if (i === 0) {
// check if first label is being truncated
if (w.globals.skipFirstTimelinelabel) {
label.text = ''
}
}
if (i === labelsLen - 1) {
// check if last label is being truncated
if (w.globals.skipLastTimelinelabel) {
label.text = ''
}
}
if (w.config.xaxis.labels.hideOverlappingLabels && drawnLabels.length > 0) {
const prev = drawnLabelsRects[drawnLabelsRects.length - 1]
if (
label.x <
prev.textRect.width /
(w.globals.rotateXLabels
? Math.abs(w.config.xaxis.labels.rotate) / 12
: 1.01) +
prev.x
) {
label.text = ''
}
}
return label
}
checkForReversedLabels(i, labels) {
const w = this.w
if (w.config.yaxis[i] && w.config.yaxis[i].reversed) {
labels.reverse()
}
return labels
}
isYAxisHidden(index) {
const w = this.w
const coreUtils = new CoreUtils(this.ctx)
return (
!w.config.yaxis[index].show ||
(!w.config.yaxis[index].showForNullSeries &&
coreUtils.isSeriesNull(index) &&
w.globals.collapsedSeriesIndices.indexOf(index) === -1)
)
}
// get the label color for y-axis
// realIndex is the actual series index, while i is the tick Index
getYAxisForeColor(yColors, realIndex) {
const w = this.w
if (Array.isArray(yColors) && w.globals.yAxisScale[realIndex]) {
this.ctx.theme.pushExtraColors(
yColors,
w.globals.yAxisScale[realIndex].result.length,
false
)
}
return yColors
}
drawYAxisTicks(
x,
tickAmount,
axisBorder,
axisTicks,
realIndex,
labelsDivider,
elYaxis
) {
let w = this.w
let graphics = new Graphics(this.ctx)
// initial label position = 0;
let t = w.globals.translateY
if (axisTicks.show && tickAmount > 0) {
if (w.config.yaxis[realIndex].opposite === true) x = x + axisTicks.width
for (let i = tickAmount; i >= 0; i--) {
let tY =
t + tickAmount / 10 + w.config.yaxis[realIndex].labels.offsetY - 1
if (w.globals.isBarHorizontal) {
tY = labelsDivider * i
}
if (w.config.chart.type === 'heatmap') {
tY = tY + labelsDivider / 2
}
let elTick = graphics.drawLine(
x + axisBorder.offsetX - axisTicks.width + axisTicks.offsetX,
tY + axisTicks.offsetY,
x + axisBorder.offsetX + axisTicks.offsetX,
tY + axisTicks.offsetY,
axisTicks.color
)
elYaxis.add(elTick)
t = t + labelsDivider
}
}
}
}