1 files changed, 60 insertions, 0 deletions
diff --git a/animism-align/frontend/app/utils/align.utils.js b/animism-align/frontend/app/utils/align.utils.js
new file mode 100644
index 0000000..f64c5c8
--- /dev/null
+++ b/animism-align/frontend/app/utils/align.utils.js
@@ -0,0 +1,60 @@
+import { ZOOM_STEPS } from 'app/constants'
+import { clamp } from 'app/utils'
+import actions from 'app/actions'
+
+import { HEADER_MARGIN, INNER_HEIGHT } from 'app/constants'
+
+export const positionToTime = (y, { start_ts, zoom, duration }) => {
+  y -= HEADER_MARGIN
+  const secondsPerPixel = ZOOM_STEPS[zoom] * 0.1
+  const widthTimeDuration = INNER_HEIGHT * secondsPerPixel
+  const timeMin = start_ts
+  const timeMax = Math.min(start_ts + widthTimeDuration, duration)
+  const timeWidth = timeMax - timeMin
+  return clamp(y * secondsPerPixel + start_ts, 0, timeMax)
+}
+
+export const timeToPosition = (ts, { start_ts, zoom, duration }) => {
+  const secondsPerPixel = ZOOM_STEPS[zoom] * 0.1
+  const widthTimeDuration = INNER_HEIGHT * secondsPerPixel
+  const timeMin = start_ts
+  const timeMax = Math.min(start_ts + widthTimeDuration, duration)
+  const timeWidth = timeMax - timeMin
+  const timeHalfHeight = INNER_HEIGHT * secondsPerPixel / 2
+  if (ts < timeMin - timeHalfHeight) {
+    return -9999
+  }
+  if (ts > timeMax) {
+    return -9999
+  }
+  return (ts - timeMin) / timeWidth * INNER_HEIGHT
+}
+
+export const getFirstPunctuationMarkIndex = text => {
+  const indexes = [
+    text.indexOf('. '),
+    text.indexOf('? '),
+    text.indexOf('! '),
+    text.indexOf('." '),
+    text.indexOf('?" '),
+    text.indexOf('!" '),
+    text.indexOf('.” '),
+    text.indexOf('?” '),
+    text.indexOf('!” '),
+  ]
+
+  return indexes.reduce((a, b) => {
+    if (b < 0) return a
+    return Math.min(a, b)
+  }, Infinity) + 1
+}
+
+export const cutFirstSentence = text => {
+  const textToCrop = text.trim().replace("\n", " ").split("\n")[0]
+  let cropIndex = getFirstPunctuationMarkIndex(textToCrop)
+  if (!cropIndex) cropIndex = textToCrop.length
+  const croppedText = textToCrop.substr(0, cropIndex).trim()
+  const updatedText = text.trim().replace(croppedText, '').trim()
+  actions.site.updateText(updatedText)
+  return croppedText
+}