adding canvas, drawing tick timestamps based on zoom

2 files changed, 158 insertions, 0 deletions

diff --git a/animism-align/frontend/views/align/components/ticks.component.js b/animism-align/frontend/views/align/components/ticks.component.js
new file mode 100644
index 0000000..3baa1f6
--- /dev/null
+++ b/animism-align/frontend/views/align/components/ticks.component.js
@@ -0,0 +1,83 @@
+import React, { Component } from 'react'
+
+import { ZOOM_STEPS, ZOOM_TICK_INTERVAL } from '../constants'
+import { timestamp } from '../../../util'
+
+export default class Ticks extends Component {
+  render() {
+    let { start_ts, zoom, duration } = this.props.timeline
+    start_ts = 65.0
+    duration /= 10
+    zoom = 2
+    const width = window.innerWidth
+
+    let secondsPerPixel = ZOOM_STEPS[zoom] / 10 // 0.1 sec / step
+    let pixelTimeDuration = 1 / secondsPerPixel // secs per pixel
+    let widthTimeDuration = width / pixelTimeDuration // secs per pixel
+    console.log(secondsPerPixel, pixelTimeDuration)
+    console.log('width in seconds', widthTimeDuration)
+
+    let secondsPerTick = ZOOM_STEPS[zoom] * 10 // secs
+    let pixelsPerTick = secondsPerTick * pixelTimeDuration
+    console.log('pixels per tick', pixelsPerTick)
+
+    let labelSpacing = pixelsPerTick
+    let subdivision = secondsPerTick
+    while (labelSpacing < 200) {
+      labelSpacing *= 2
+      subdivision *= 2
+    }
+
+    console.log('start ts', start_ts)
+    let pixelOffset = (start_ts / secondsPerPixel)
+    let pixelRemainder = pixelOffset % labelSpacing
+    // let startOffset = pixelsPerTick - (startTiming % pixelsPerTick)
+    let startOffset = labelSpacing - pixelRemainder
+    let startTiming = (pixelOffset + startOffset) * secondsPerPixel
+
+    let tickCount = Math.ceil(width / labelSpacing)
+    let offset, timing, tickLabels = [], ticks = []
+    for (var i = -1; i < tickCount; i++) {
+      offset = i * labelSpacing + startOffset
+      if (offset + 20 > width) continue
+      timing = i * subdivision + startTiming
+      if (timing > duration) {
+        break
+      }
+      tickLabels.push(
+        <div className='tickLabel' key={"tickLabel_" + i}
+          style={{
+            left: Math.floor(offset)
+          }}>
+          {timestamp(timing)}
+        </div>
+      )
+    }
+
+    // tickLabels.push(
+    //   <div className='tickLabel tickLabelTotal' key={"tickLabel_total"}
+    //     style={{
+    //       left: width
+    //     }}>
+    //     {timestamp(duration, 1)}
+    //   </div>
+    // )
+    // for (var i = 0; i < minuteCount; i += 1) {
+    //   offset = i * labelSpacing
+    //   timing = i * subdivision
+    //   ticks.push(
+    //     <div className='tick' key={"tick_" + i}
+    //       style={{
+    //         left: Math.floor(offset),
+    //       }}
+    //     />
+    //   )
+    // }
+    return (
+      <div className='ticks'>
+        {ticks}
+        {tickLabels}
+      </div>
+    )
+  }
+}
diff --git a/animism-align/frontend/views/align/components/timeline.component.js b/animism-align/frontend/views/align/components/timeline.component.js
new file mode 100644
index 0000000..af3c57b
--- /dev/null
+++ b/animism-align/frontend/views/align/components/timeline.component.js
@@ -0,0 +1,75 @@
+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 * as constants 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 = constants.DEFAULT_HEIGHT
+  }
+  draw() {
+    const canvas = this.canvasRef.current
+    const ctx = canvas.getContext('2d')
+    const w = window.innerWidth
+    this.clearCanvas(ctx, w)
+  }
+  clearCanvas(ctx, w) {  
+    const h = constants.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)'
+  }
+  render() {
+    return (
+      <div className='timeline'>
+        <canvas ref={this.canvasRef} />
+        <Ticks timeline={this.props.timeline} />
+      </div>
+    )
+  }
+}
+
+const mapStateToProps = state => ({
+  timeline: state.align.timeline,
+})
+
+const mapDispatchToProps = dispatch => ({
+  // uploadActions: bindActionCreators({ ...uploadActions }, dispatch),
+})
+
+export default connect(mapStateToProps, mapDispatchToProps)(Timeline)