[BUG?] Perspective Power Chart Bug - Embr-Chart as a Replacement?

[bmusson]

Okay, nerd sniped. Pretty untested, no idea what happens with negative scales.

/// plugins[0].afterEvent
(chart, event) => {
    if (event.event.type !== 'mousedown') return

    const { x: clickX, y: clickY } = event.event
    const { y: scale } = chart.scales

    const onScale = clickX < scale.right && clickY > scale.left
    console.log(onScale)
    if (!onScale) return

    let isDragging = true
    const { min: startMin, max: startMax, height: scaleHeight } = scale

    const onMouseMove = (moveEvent) => {
        if (!isDragging) return

        console.log('onMouseMove')
        const deltaY = moveEvent.clientY - clickY
        const percentChange = (deltaY / scaleHeight) * (startMax - startMin)
        const delta = (percentChange * (startMax - startMin)) / 100

        chart.options.scales.y.min = startMin
        chart.options.scales.y.max = startMax + delta
        chart.update()
    }

    const onMouseUp = () => {
        console.log('onMouseUp')
        isDragging = false
        document.removeEventListener('mousemove', onMouseMove)
        document.removeEventListener('mouseup', onMouseUp)
    }

    document.addEventListener('mousemove', onMouseMove)
    document.addEventListener('mouseup', onMouseUp)

    console.log(chart, event)
}