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import React, { Component } from 'react'
// import { Link } from 'react-router-dom'
// import { bindActionCreators } from 'redux'
import { connect } from 'react-redux'
import actions from '../../../actions'
// import * as uploadActions from './upload.actions'
import Ticks from './ticks.component'
import { DEFAULT_HEIGHT, WAVEFORM_HEIGHT, ZOOM_STEPS, ZOOM_LABEL_STEPS, ZOOM_TICK_STEPS } from '../constants'
class Timeline extends Component {
constructor(props){
super(props)
this.canvasRef = React.createRef()
this.handleKeydown = this.handleKeydown.bind(this)
}
componentDidMount() {
this.bind()
this.resize()
this.draw()
}
componentDidUpdate() {
this.draw()
}
componentWillUnmount() {
this.unbind()
}
bind() {
document.addEventListener('keydown', this.handleKeydown)
}
unbind() {
document.removeEventListener('keydown', this.handleKeydown)
}
handleKeydown(e) {
// console.log(e.shiftKey, e.keyCode)
}
resize() {
const canvas = this.canvasRef.current
canvas.width = window.innerWidth
canvas.height = DEFAULT_HEIGHT
}
draw() {
const canvas = this.canvasRef.current
const ctx = canvas.getContext('2d')
const w = window.innerWidth
this.clearCanvas(ctx, w)
this.drawCurve(ctx, w)
}
clearCanvas(ctx, w) {
const h = WAVEFORM_HEIGHT
ctx.clearRect(0, 0, w, h)
ctx.fillStyle = 'rgba(0,0,0,0.5)'
ctx.fillRect(0, 0, w, h)
ctx.fillStyle = 'rgba(64,128,192,0.5)'
}
drawCurve(ctx, w) {
let { peaks, timeline } = this.props
let { start_ts, zoom, duration } = timeline
let stepsPerPixel = ZOOM_STEPS[zoom] // 0.1 sec / step
let indexesPerPixel = stepsPerPixel * 2
let stepMin = start_ts * 10
let stepDuration = duration * 10 / stepsPerPixel
let stepMax = stepDuration - stepMin
let stepWidth = Math.min(stepMax, w)
stepWidth += 2 + (stepWidth % 2)
let i = 0
let step = stepMin
let waveformPeak = WAVEFORM_HEIGHT / 2
let origin = (1 - peaks[step]) * waveformPeak
let y = origin
let peak
ctx.beginPath()
ctx.moveTo(0, y)
for (i = 0; i < stepWidth; i++) {
step = i * indexesPerPixel + stepMin
peak = peaks[step]
y = (1 - peak) * waveformPeak
ctx.lineTo(i, y)
}
for (i = stepWidth - 1; i > 0; i--) {
step = i * indexesPerPixel + stepMin
peak = peaks[step]
y = (1 + peaks[step]) * waveformPeak
ctx.lineTo(i, y)
}
ctx.lineTo(0, origin)
ctx.fillStyle = 'rgba(255,255,255,0.8)'
ctx.fill()
}
render() {
return (
<div className='timeline'>
<canvas ref={this.canvasRef} />
<Ticks timeline={this.props.timeline} />
</div>
)
}
}
const mapStateToProps = state => ({
timeline: state.align.timeline,
peaks: state.site.peaks,
})
const mapDispatchToProps = dispatch => ({
// uploadActions: bindActionCreators({ ...uploadActions }, dispatch),
})
export default connect(mapStateToProps, mapDispatchToProps)(Timeline)
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