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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 'app/actions'
import {
WAVEFORM_SIZE, INNER_HEIGHT,
ZOOM_STEPS, ZOOM_LABEL_STEPS, ZOOM_TICK_STEPS,
} from 'app/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 = WAVEFORM_SIZE
canvas.height = INNER_HEIGHT
}
draw() {
const canvas = this.canvasRef.current
const ctx = canvas.getContext('2d')
const h = INNER_HEIGHT
this.clearCanvas(ctx, h)
this.drawCurve(ctx, h)
}
clearCanvas(ctx, h) {
const w = WAVEFORM_SIZE
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, h) {
let { peaks, timeline } = this.props
let { start_ts, zoom, duration } = timeline
let secondsPerPixel = ZOOM_STEPS[zoom] * 0.1 // 0.1 sec / step
let stepsPerPixel = ZOOM_STEPS[zoom] // 0.1 sec / step
let widthTimeDuration = h * secondsPerPixel // secs per pixel
let timeMin = Math.round(start_ts / secondsPerPixel) * secondsPerPixel
let timeMax = Math.min(timeMin + widthTimeDuration, duration)
let timeWidth = timeMax - timeMin
let stepMin = Math.floor(timeMin * 10)
let pixelWidth = Math.ceil(timeWidth / secondsPerPixel)
let i = 0
let step = stepMin
let waveformPeak = WAVEFORM_SIZE / 2
let origin = (1 - peaks[step]) * waveformPeak
let y
let peak
// console.log(stepMin, pixelWidth * stepsPerPixel + stepMin)
ctx.beginPath()
ctx.moveTo(origin, 0)
for (i = 0; i < pixelWidth; i++) {
step = i * stepsPerPixel + stepMin
peak = peaks[step]
y = (1 - peak) * waveformPeak
ctx.lineTo(y, i)
}
for (i = pixelWidth - 1; i > 0; i--) {
step = i * stepsPerPixel + stepMin
peak = peaks[step]
y = (1 + peak) * waveformPeak
ctx.lineTo(y, i)
}
ctx.lineTo(origin, 0)
ctx.fillStyle = 'rgba(255,255,255,0.8)'
ctx.fill()
}
render() {
return (
<canvas
ref={this.canvasRef}
onMouseDown={this.props.onMouseDown}
onMouseUp={this.props.onMouseUp}
/>
)
}
}
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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