Class EllipseFigure

Add callback function to be triggered when specified event is fired.

 // Example syntax
 object.addEventListener('click', (event) => {
     console.log(event)
 })

Some classes also report extra information about the interacted object with the second parameter:

 // Most series share information about interacted data point
 series.addEventListener('click', (event, info) => {
     console.log(info)
 })

Optional third parameter allows registering event handlers that will automatically remove themselves after first trigger:

 // Example this listener will only fire once
 object.addEventListener('click', (event) => {})

Each class has its own list of supported events. Some events are from HTML standard (click, pointerdown, etc.), while others are own events from LightningChart JS (dispose, resize, etc.)

To find what events are available, you can try following:

• If your development environment has TypeScript enabled, just write addEventListener and see what possible event types the IDE suggests. These APIs are strongly typed, and even the callback event will be correctly typed.
• Otherwise, open the class section in API documentation and check out which interface K type parameter extends.

Permanently destroy the component.

To fully allow Garbage-Collection to free the resources used by the component, make sure to remove any references to the component and its children in application code.

let chart = ...ChartXY()
let axisX = chart.getDefaultAxisX()
// Dispose Chart, and remove all references so that they can be garbage-collected.
chart.dispose()
chart = undefined
axisX = undefined

Returns

Object itself for fluent interface

Returns

Mouse interactions state

Get element visibility.

Returns

true when element is set to be visible and false otherwise.

Check whether the object is disposed. Disposed objects should not be used!

Returns

true if object is disposed.

Remove event listener added using addEventListener. The expected argument should be the exact same callback function that was supplied using addEventListener:

 // Basic example syntax
 const listener = () => {}
 obj.addEventListener('click', listener)
 obj.removeEventListener('click', listener)

 // Basic boilerplate of custom interaction when user drags on an object
 obj.addEventListener('pointerdown', (eventDown) => {
     let prevCoord = eventDown
     const handlePointerMove: LCJSInteractionEventListener<'pointermove'> = (eventMove) => {
         const delta = { x: eventMove.clientX - prevCoord.clientX, y: eventMove.clientY - prevCoord.clientY }
         prevCoord = eventMove
         console.log(delta, eventMove.clientX, eventMove.clientY)
     }
     const handlePointerUp: LCJSInteractionEventListener<'pointerup'> = (eventUp) => {
         window.removeEventListener('pointermove', handlePointerMove)
         window.removeEventListener('pointerup', handlePointerUp)
     }
     window.addEventListener('pointermove', handlePointerMove)
     window.addEventListener('pointerup', handlePointerUp)
 })

Set mouse interactions enabled or disabled

Returns

Object itself for fluent interface

Set element visibility.

Returns

Object itself.