apexcharts
Version:
A JavaScript Chart Library
805 lines (694 loc) • 23.3 kB
JavaScript
import Graphics from './Graphics'
import Utils from './../utils/Utils'
import Toolbar from './Toolbar'
import Scales from './Scales'
/**
* ApexCharts Zoom Class for handling zooming and panning on axes based charts.
*
* @module ZoomPanSelection
**/
export default class ZoomPanSelection extends Toolbar {
constructor(ctx) {
super(ctx)
this.ctx = ctx
this.w = ctx.w
this.dragged = false
this.graphics = new Graphics(this.ctx)
this.eventList = [
'mousedown',
'mouseleave',
'mousemove',
'touchstart',
'touchmove',
'mouseup',
'touchend',
]
this.clientX = 0
this.clientY = 0
this.startX = 0
this.endX = 0
this.dragX = 0
this.startY = 0
this.endY = 0
this.dragY = 0
this.moveDirection = 'none'
}
init({ xyRatios }) {
let w = this.w
let me = this
this.xyRatios = xyRatios
this.zoomRect = this.graphics.drawRect(0, 0, 0, 0)
this.selectionRect = this.graphics.drawRect(0, 0, 0, 0)
this.gridRect = w.globals.dom.baseEl.querySelector('.apexcharts-grid')
this.zoomRect.node.classList.add('apexcharts-zoom-rect')
this.selectionRect.node.classList.add('apexcharts-selection-rect')
w.globals.dom.elGraphical.add(this.zoomRect)
w.globals.dom.elGraphical.add(this.selectionRect)
if (w.config.chart.selection.type === 'x') {
this.slDraggableRect = this.selectionRect
.draggable({
minX: 0,
minY: 0,
maxX: w.globals.gridWidth,
maxY: w.globals.gridHeight,
})
.on('dragmove', this.selectionDragging.bind(this, 'dragging'))
} else if (w.config.chart.selection.type === 'y') {
this.slDraggableRect = this.selectionRect
.draggable({
minX: 0,
maxX: w.globals.gridWidth,
})
.on('dragmove', this.selectionDragging.bind(this, 'dragging'))
} else {
this.slDraggableRect = this.selectionRect
.draggable()
.on('dragmove', this.selectionDragging.bind(this, 'dragging'))
}
this.preselectedSelection()
this.hoverArea = w.globals.dom.baseEl.querySelector(
`${w.globals.chartClass} .apexcharts-svg`
)
this.hoverArea.classList.add('apexcharts-zoomable')
this.eventList.forEach((event) => {
this.hoverArea.addEventListener(
event,
me.svgMouseEvents.bind(me, xyRatios),
{
capture: false,
passive: true,
}
)
})
}
// remove the event listeners which were previously added on hover area
destroy() {
if (this.slDraggableRect) {
this.slDraggableRect.draggable(false)
this.slDraggableRect.off()
this.selectionRect.off()
}
this.selectionRect = null
this.zoomRect = null
this.gridRect = null
}
svgMouseEvents(xyRatios, e) {
let w = this.w
let me = this
const toolbar = this.ctx.toolbar
let zoomtype = w.globals.zoomEnabled
? w.config.chart.zoom.type
: w.config.chart.selection.type
const autoSelected = w.config.chart.toolbar.autoSelected
if (e.shiftKey) {
this.shiftWasPressed = true
toolbar.enableZoomPanFromToolbar(autoSelected === 'pan' ? 'zoom' : 'pan')
} else {
if (this.shiftWasPressed) {
toolbar.enableZoomPanFromToolbar(autoSelected)
this.shiftWasPressed = false
}
}
if (!e.target) return
const tc = e.target.classList
let pc
if (e.target.parentNode && e.target.parentNode !== null) {
pc = e.target.parentNode.classList
}
const falsePositives =
tc.contains('apexcharts-selection-rect') ||
tc.contains('apexcharts-legend-marker') ||
tc.contains('apexcharts-legend-text') ||
(pc && pc.contains('apexcharts-toolbar'))
if (falsePositives) return
me.clientX =
e.type === 'touchmove' || e.type === 'touchstart'
? e.touches[0].clientX
: e.type === 'touchend'
? e.changedTouches[0].clientX
: e.clientX
me.clientY =
e.type === 'touchmove' || e.type === 'touchstart'
? e.touches[0].clientY
: e.type === 'touchend'
? e.changedTouches[0].clientY
: e.clientY
if (e.type === 'mousedown' && e.which === 1) {
let gridRectDim = me.gridRect.getBoundingClientRect()
me.startX = me.clientX - gridRectDim.left
me.startY = me.clientY - gridRectDim.top
me.dragged = false
me.w.globals.mousedown = true
}
if ((e.type === 'mousemove' && e.which === 1) || e.type === 'touchmove') {
me.dragged = true
if (w.globals.panEnabled) {
w.globals.selection = null
if (me.w.globals.mousedown) {
me.panDragging({
context: me,
zoomtype,
xyRatios,
})
}
} else {
if (
(me.w.globals.mousedown && w.globals.zoomEnabled) ||
(me.w.globals.mousedown && w.globals.selectionEnabled)
) {
me.selection = me.selectionDrawing({
context: me,
zoomtype,
})
}
}
}
if (
e.type === 'mouseup' ||
e.type === 'touchend' ||
e.type === 'mouseleave'
) {
// we will be calling getBoundingClientRect on each mousedown/mousemove/mouseup
let gridRectDim = me.gridRect.getBoundingClientRect()
if (me.w.globals.mousedown) {
// user released the drag, now do all the calculations
me.endX = me.clientX - gridRectDim.left
me.endY = me.clientY - gridRectDim.top
me.dragX = Math.abs(me.endX - me.startX)
me.dragY = Math.abs(me.endY - me.startY)
if (w.globals.zoomEnabled || w.globals.selectionEnabled) {
me.selectionDrawn({
context: me,
zoomtype,
})
}
if (w.globals.panEnabled && w.config.xaxis.convertedCatToNumeric) {
me.delayedPanScrolled()
}
}
if (w.globals.zoomEnabled) {
me.hideSelectionRect(this.selectionRect)
}
me.dragged = false
me.w.globals.mousedown = false
}
this.makeSelectionRectDraggable()
}
makeSelectionRectDraggable() {
const w = this.w
if (!this.selectionRect) return
const rectDim = this.selectionRect.node.getBoundingClientRect()
if (rectDim.width > 0 && rectDim.height > 0) {
this.slDraggableRect
.selectize({
points: 'l, r',
pointSize: 8,
pointType: 'rect',
})
.resize({
constraint: {
minX: 0,
minY: 0,
maxX: w.globals.gridWidth,
maxY: w.globals.gridHeight,
},
})
.on('resizing', this.selectionDragging.bind(this, 'resizing'))
}
}
preselectedSelection() {
const w = this.w
const xyRatios = this.xyRatios
if (!w.globals.zoomEnabled) {
if (
typeof w.globals.selection !== 'undefined' &&
w.globals.selection !== null
) {
this.drawSelectionRect(w.globals.selection)
} else {
if (
w.config.chart.selection.xaxis.min !== undefined &&
w.config.chart.selection.xaxis.max !== undefined
) {
let x =
(w.config.chart.selection.xaxis.min - w.globals.minX) /
xyRatios.xRatio
let width =
w.globals.gridWidth -
(w.globals.maxX - w.config.chart.selection.xaxis.max) /
xyRatios.xRatio -
x
if (w.globals.isRangeBar) {
// rangebars put datetime data in y axis
x = // calculation: (selection left time - chart left time) / milliseconds per pixel = selection X value in pixels
(w.config.chart.selection.xaxis.min -
w.globals.yAxisScale[0].niceMin) /
xyRatios.invertedYRatio
width =
(w.config.chart.selection.xaxis.max -
w.config.chart.selection.xaxis.min) /
xyRatios.invertedYRatio
}
let selectionRect = {
x,
y: 0,
width,
height: w.globals.gridHeight,
translateX: 0,
translateY: 0,
selectionEnabled: true,
}
this.drawSelectionRect(selectionRect)
this.makeSelectionRectDraggable()
if (typeof w.config.chart.events.selection === 'function') {
w.config.chart.events.selection(this.ctx, {
xaxis: {
min: w.config.chart.selection.xaxis.min,
max: w.config.chart.selection.xaxis.max,
},
yaxis: {},
})
}
}
}
}
}
drawSelectionRect({ x, y, width, height, translateX = 0, translateY = 0 }) {
const w = this.w
const zoomRect = this.zoomRect
const selectionRect = this.selectionRect
if (this.dragged || w.globals.selection !== null) {
let scalingAttrs = {
transform: 'translate(' + translateX + ', ' + translateY + ')',
}
// change styles based on zoom or selection
// zoom is Enabled and user has dragged, so draw blue rect
if (w.globals.zoomEnabled && this.dragged) {
if (width < 0) width = 1 // fixes apexcharts.js#1168
zoomRect.attr({
x,
y,
width,
height,
fill: w.config.chart.zoom.zoomedArea.fill.color,
'fill-opacity': w.config.chart.zoom.zoomedArea.fill.opacity,
stroke: w.config.chart.zoom.zoomedArea.stroke.color,
'stroke-width': w.config.chart.zoom.zoomedArea.stroke.width,
'stroke-opacity': w.config.chart.zoom.zoomedArea.stroke.opacity,
})
Graphics.setAttrs(zoomRect.node, scalingAttrs)
}
// selection is enabled
if (w.globals.selectionEnabled) {
selectionRect.attr({
x,
y,
width: width > 0 ? width : 0,
height: height > 0 ? height : 0,
fill: w.config.chart.selection.fill.color,
'fill-opacity': w.config.chart.selection.fill.opacity,
stroke: w.config.chart.selection.stroke.color,
'stroke-width': w.config.chart.selection.stroke.width,
'stroke-dasharray': w.config.chart.selection.stroke.dashArray,
'stroke-opacity': w.config.chart.selection.stroke.opacity,
})
Graphics.setAttrs(selectionRect.node, scalingAttrs)
}
}
}
hideSelectionRect(rect) {
if (rect) {
rect.attr({
x: 0,
y: 0,
width: 0,
height: 0,
})
}
}
selectionDrawing({ context, zoomtype }) {
const w = this.w
let me = context
let gridRectDim = this.gridRect.getBoundingClientRect()
let startX = me.startX - 1
let startY = me.startY
let inversedX = false
let inversedY = false
let selectionWidth = me.clientX - gridRectDim.left - startX
let selectionHeight = me.clientY - gridRectDim.top - startY
let selectionRect = {}
if (Math.abs(selectionWidth + startX) > w.globals.gridWidth) {
// user dragged the mouse outside drawing area to the right
selectionWidth = w.globals.gridWidth - startX
} else if (me.clientX - gridRectDim.left < 0) {
// user dragged the mouse outside drawing area to the left
selectionWidth = startX
}
// inverse selection X
if (startX > me.clientX - gridRectDim.left) {
inversedX = true
selectionWidth = Math.abs(selectionWidth)
}
// inverse selection Y
if (startY > me.clientY - gridRectDim.top) {
inversedY = true
selectionHeight = Math.abs(selectionHeight)
}
if (zoomtype === 'x') {
selectionRect = {
x: inversedX ? startX - selectionWidth : startX,
y: 0,
width: selectionWidth,
height: w.globals.gridHeight,
}
} else if (zoomtype === 'y') {
selectionRect = {
x: 0,
y: inversedY ? startY - selectionHeight : startY,
width: w.globals.gridWidth,
height: selectionHeight,
}
} else {
selectionRect = {
x: inversedX ? startX - selectionWidth : startX,
y: inversedY ? startY - selectionHeight : startY,
width: selectionWidth,
height: selectionHeight,
}
}
me.drawSelectionRect(selectionRect)
me.selectionDragging('resizing')
return selectionRect
}
selectionDragging(type, e) {
const w = this.w
const xyRatios = this.xyRatios
const selRect = this.selectionRect
let timerInterval = 0
if (type === 'resizing') {
timerInterval = 30
}
// update selection when selection rect is dragged
const getSelAttr = (attr) => {
return parseFloat(selRect.node.getAttribute(attr))
}
const draggedProps = {
x: getSelAttr('x'),
y: getSelAttr('y'),
width: getSelAttr('width'),
height: getSelAttr('height'),
}
w.globals.selection = draggedProps
// update selection ends
if (
typeof w.config.chart.events.selection === 'function' &&
w.globals.selectionEnabled
) {
// a small debouncer is required when resizing to avoid freezing the chart
clearTimeout(this.w.globals.selectionResizeTimer)
this.w.globals.selectionResizeTimer = window.setTimeout(() => {
const gridRectDim = this.gridRect.getBoundingClientRect()
const selectionRect = selRect.node.getBoundingClientRect()
let minX, maxX, minY, maxY
if (!w.globals.isRangeBar) {
// original code is in the IF. rangeBar exception is in the ELSE.
minX =
w.globals.xAxisScale.niceMin +
(selectionRect.left - gridRectDim.left) * xyRatios.xRatio
maxX =
w.globals.xAxisScale.niceMin +
(selectionRect.right - gridRectDim.left) * xyRatios.xRatio
minY =
w.globals.yAxisScale[0].niceMin +
(gridRectDim.bottom - selectionRect.bottom) * xyRatios.yRatio[0]
maxY =
w.globals.yAxisScale[0].niceMax -
(selectionRect.top - gridRectDim.top) * xyRatios.yRatio[0]
} else {
// rangeBars use x as the category, and y as the datetime data. // find data in y axis and use Y ratio
minX =
w.globals.yAxisScale[0].niceMin +
(selectionRect.left - gridRectDim.left) * xyRatios.invertedYRatio
maxX =
w.globals.yAxisScale[0].niceMin +
(selectionRect.right - gridRectDim.left) * xyRatios.invertedYRatio
minY = 0 // there is no y min/max with rangebars (it uses categories, not numeric data), so use dummy values
maxY = 1
}
const xyAxis = {
xaxis: {
min: minX,
max: maxX,
},
yaxis: {
min: minY,
max: maxY,
},
}
w.config.chart.events.selection(this.ctx, xyAxis)
if (
w.config.chart.brush.enabled &&
w.config.chart.events.brushScrolled !== undefined
) {
w.config.chart.events.brushScrolled(this.ctx, xyAxis)
}
}, timerInterval)
}
}
selectionDrawn({ context, zoomtype }) {
const w = this.w
const me = context
const xyRatios = this.xyRatios
const toolbar = this.ctx.toolbar
if (me.startX > me.endX) {
let tempX = me.startX
me.startX = me.endX
me.endX = tempX
}
if (me.startY > me.endY) {
let tempY = me.startY
me.startY = me.endY
me.endY = tempY
}
let xLowestValue = undefined
let xHighestValue = undefined
if (!w.globals.isRangeBar) {
xLowestValue = w.globals.xAxisScale.niceMin + me.startX * xyRatios.xRatio
xHighestValue = w.globals.xAxisScale.niceMin + me.endX * xyRatios.xRatio
} else {
xLowestValue =
w.globals.yAxisScale[0].niceMin + me.startX * xyRatios.invertedYRatio
xHighestValue =
w.globals.yAxisScale[0].niceMin + me.endX * xyRatios.invertedYRatio
}
// TODO: we will consider the 1st y axis values here for getting highest and lowest y
let yHighestValue = []
let yLowestValue = []
w.config.yaxis.forEach((yaxe, index) => {
yHighestValue.push(
w.globals.yAxisScale[index].niceMax - xyRatios.yRatio[index] * me.startY
)
yLowestValue.push(
w.globals.yAxisScale[index].niceMax - xyRatios.yRatio[index] * me.endY
)
})
if (
me.dragged &&
(me.dragX > 10 || me.dragY > 10) &&
xLowestValue !== xHighestValue
) {
if (w.globals.zoomEnabled) {
let yaxis = Utils.clone(w.globals.initialConfig.yaxis)
let xaxis = Utils.clone(w.globals.initialConfig.xaxis)
w.globals.zoomed = true
if (w.config.xaxis.convertedCatToNumeric) {
xLowestValue = Math.floor(xLowestValue)
xHighestValue = Math.floor(xHighestValue)
if (xLowestValue < 1) {
xLowestValue = 1
xHighestValue = w.globals.dataPoints
}
if (xHighestValue - xLowestValue < 2) {
xHighestValue = xLowestValue + 1
}
}
if (zoomtype === 'xy' || zoomtype === 'x') {
xaxis = {
min: xLowestValue,
max: xHighestValue,
}
}
if (zoomtype === 'xy' || zoomtype === 'y') {
yaxis.forEach((yaxe, index) => {
yaxis[index].min = yLowestValue[index]
yaxis[index].max = yHighestValue[index]
})
}
if (w.config.chart.zoom.autoScaleYaxis) {
const scale = new Scales(me.ctx)
yaxis = scale.autoScaleY(me.ctx, yaxis, {
xaxis,
})
}
if (toolbar) {
let beforeZoomRange = toolbar.getBeforeZoomRange(xaxis, yaxis)
if (beforeZoomRange) {
xaxis = beforeZoomRange.xaxis ? beforeZoomRange.xaxis : xaxis
yaxis = beforeZoomRange.yaxis ? beforeZoomRange.yaxis : yaxis
}
}
let options = {
xaxis,
}
if (!w.config.chart.group) {
// if chart in a group, prevent yaxis update here
// fix issue #650
options.yaxis = yaxis
}
me.ctx.updateHelpers._updateOptions(
options,
false,
me.w.config.chart.animations.dynamicAnimation.enabled
)
if (typeof w.config.chart.events.zoomed === 'function') {
toolbar.zoomCallback(xaxis, yaxis)
}
} else if (w.globals.selectionEnabled) {
let yaxis = null
let xaxis = null
xaxis = {
min: xLowestValue,
max: xHighestValue,
}
if (zoomtype === 'xy' || zoomtype === 'y') {
yaxis = Utils.clone(w.config.yaxis)
yaxis.forEach((yaxe, index) => {
yaxis[index].min = yLowestValue[index]
yaxis[index].max = yHighestValue[index]
})
}
w.globals.selection = me.selection
if (typeof w.config.chart.events.selection === 'function') {
w.config.chart.events.selection(me.ctx, {
xaxis,
yaxis,
})
}
}
}
}
panDragging({ context }) {
const w = this.w
let me = context
// check to make sure there is data to compare against
if (typeof w.globals.lastClientPosition.x !== 'undefined') {
// get the change from last position to this position
const deltaX = w.globals.lastClientPosition.x - me.clientX
const deltaY = w.globals.lastClientPosition.y - me.clientY
// check which direction had the highest amplitude and then figure out direction by checking if the value is greater or less than zero
if (Math.abs(deltaX) > Math.abs(deltaY) && deltaX > 0) {
this.moveDirection = 'left'
} else if (Math.abs(deltaX) > Math.abs(deltaY) && deltaX < 0) {
this.moveDirection = 'right'
} else if (Math.abs(deltaY) > Math.abs(deltaX) && deltaY > 0) {
this.moveDirection = 'up'
} else if (Math.abs(deltaY) > Math.abs(deltaX) && deltaY < 0) {
this.moveDirection = 'down'
}
}
// set the new last position to the current for next time (to get the position of drag)
w.globals.lastClientPosition = {
x: me.clientX,
y: me.clientY,
}
let xLowestValue = w.globals.isRangeBar ? w.globals.minY : w.globals.minX
let xHighestValue = w.globals.isRangeBar ? w.globals.maxY : w.globals.maxX
// on a category, we don't pan continuosly as it causes bugs
if (!w.config.xaxis.convertedCatToNumeric) {
me.panScrolled(xLowestValue, xHighestValue)
}
}
delayedPanScrolled() {
const w = this.w
let newMinX = w.globals.minX
let newMaxX = w.globals.maxX
const centerX = (w.globals.maxX - w.globals.minX) / 2
if (this.moveDirection === 'left') {
newMinX = w.globals.minX + centerX
newMaxX = w.globals.maxX + centerX
} else if (this.moveDirection === 'right') {
newMinX = w.globals.minX - centerX
newMaxX = w.globals.maxX - centerX
}
newMinX = Math.floor(newMinX)
newMaxX = Math.floor(newMaxX)
this.updateScrolledChart(
{ xaxis: { min: newMinX, max: newMaxX } },
newMinX,
newMaxX
)
}
panScrolled(xLowestValue, xHighestValue) {
const w = this.w
const xyRatios = this.xyRatios
let yaxis = Utils.clone(w.globals.initialConfig.yaxis)
let xRatio = xyRatios.xRatio
let minX = w.globals.minX
let maxX = w.globals.maxX
if (w.globals.isRangeBar) {
xRatio = xyRatios.invertedYRatio
minX = w.globals.minY
maxX = w.globals.maxY
}
if (this.moveDirection === 'left') {
xLowestValue = minX + (w.globals.gridWidth / 15) * xRatio
xHighestValue = maxX + (w.globals.gridWidth / 15) * xRatio
} else if (this.moveDirection === 'right') {
xLowestValue = minX - (w.globals.gridWidth / 15) * xRatio
xHighestValue = maxX - (w.globals.gridWidth / 15) * xRatio
}
if (!w.globals.isRangeBar) {
if (
xLowestValue < w.globals.initialMinX ||
xHighestValue > w.globals.initialMaxX
) {
xLowestValue = minX
xHighestValue = maxX
}
}
let xaxis = {
min: xLowestValue,
max: xHighestValue,
}
if (w.config.chart.zoom.autoScaleYaxis) {
const scale = new Scales(this.ctx)
yaxis = scale.autoScaleY(this.ctx, yaxis, {
xaxis,
})
}
let options = {
xaxis: {
min: xLowestValue,
max: xHighestValue,
},
}
if (!w.config.chart.group) {
// if chart in a group, prevent yaxis update here
// fix issue #650
options.yaxis = yaxis
}
this.updateScrolledChart(options, xLowestValue, xHighestValue)
}
updateScrolledChart(options, xLowestValue, xHighestValue) {
const w = this.w
this.ctx.updateHelpers._updateOptions(options, false, false)
if (typeof w.config.chart.events.scrolled === 'function') {
w.config.chart.events.scrolled(this.ctx, {
xaxis: {
min: xLowestValue,
max: xHighestValue,
},
})
}
}
}