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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 { DEFAULT_HEIGHT, WAVEFORM_HEIGHT, ZOOM_STEPS, ZOOM_LABEL_STEPS, ZOOM_TICK_STEPS } from '../constants'
class Waveform extends Component {
constructor(props){
super(props)
this.canvasRef = React.createRef()
}
componentDidMount() {
this.resize()
this.draw()
}
componentDidUpdate() {
this.draw()
}
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
// console.log(start_ts)
// start_ts *= 10
let secondsPerPixel = ZOOM_STEPS[zoom] / 10 // 0.1 sec / step
let stepsPerPixel = ZOOM_STEPS[zoom] // 0.1 sec / step
let indexesPerPixel = stepsPerPixel * 2
let widthTimeDuration = window.innerWidth * secondsPerPixel // secs per pixel
let timeMin = start_ts
let timeMax = Math.min(start_ts + widthTimeDuration, duration)
let pixelMin = timeMin / secondsPerPixel
let pixelMax = timeMax / secondsPerPixel
// console.log('wf start_ts', pixelMin)
let stepMin = Math.floor(pixelMin * 2)
let stepMax = Math.floor(pixelMax * 2)
let stepWidth = stepMax - stepMin
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 + peak) * waveformPeak
ctx.lineTo(i, y)
}
ctx.lineTo(0, origin)
ctx.fillStyle = 'rgba(255,255,255,0.8)'
ctx.fill()
}
render() {
return (
<canvas ref={this.canvasRef} />
)
}
}
const mapStateToProps = state => ({
timeline: state.align.timeline,
peaks: state.site.peaks,
})
const mapDispatchToProps = dispatch => ({
// uploadActions: bindActionCreators({ ...uploadActions }, dispatch),
})
export default connect(mapStateToProps, mapDispatchToProps)(Waveform)
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