bobbiec.github.io/semaphore-decoder.html at master · bobbiec/bobbiec.github.io · GitHub

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<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
    <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1" />

    <title>Semaphore Decoder</title>
    <meta name="author" content="Bobbie Chen" />
    <meta name="description" content="A point-and-click visual semaphore decoder for solving puzzles" />
    <link rel="icon" href="semaphore-favicon.png" />

    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.11/dist/vue.min.js"></script>

    <link href="normalize.css" rel="stylesheet" />
    <link href="skeleton.css" rel="stylesheet" />
    <style>
      .flag {
        height: 30px;
        width: calc(min(200px, min(25vh, 50vw)) - 2em);
        padding-top: 5px;
        padding-left: 5px;
        border: 4px ridge black;
        border-right: 0px;
        position: absolute;
        display: inline-block;
        cursor: pointer;
        transform-origin: right;
      }

      .flag.hover {
        background-color: rgba(255, 255, 128, 0.5);
        z-index: 1;
      }

      .flag.selected {
        background-color: rgba(255, 255, 128, 1);
        z-index: 1;
      }

      .flag.hover.selected {
        background-color: rgba(255, 255, 128, 0.8);
        z-index: 1;
      }

      .flag-container {
        position: relative;
        padding: calc(min(200px, min(25vh, 50vw))) 0;
      }

      .info-container {
        padding-top: 1em;
      }
    </style>
  </head>
  <body>
    <div id="app" class="container">
      <semaphore-decoder></semaphore-decoder>
      <hr />
      <h3>What's this?</h3>
      <div class="row">
        <div class="one-half column">
          <p>
            <a href="https://en.wikipedia.org/wiki/Flag_semaphore">Flag semaphore</a>
            is a technique used for visual communication, where the positions of two flags represent a single letter.
          </p>
          <p>
            I often see these at puzzle hunts disguised as clock hands, tree branches, dance moves, etc., and I'm very
            slow at reading the lookup chart (see image at right). I thought the ideal way to decode semaphore would be
            to draw out the actual angles. So I wrote my own visual semaphore decoder, implemented using Vue.
          </p>
          <p>
            It's very rare to solve just one semaphore - usually you need to solve many to form a word or a phrase. So I
            added the ability to push each letter to a text box, using . (period) for quick entry. It's a regular text
            input, so you can type normally if you want to change anything.
          </p>
          <p>
            There is also a quick link to anagram the resulting letters on
            <a href="https://nutrimatic.org">Nutrimatic</a>, which is a very powerful pattern-matching tool. If you're
            familiar with Nutrimatic syntax, you can use it here as well - for example, if you're not quite sure what a
            semaphore position is, you can enter capital A for "any letter", and hope that Nutrimatic will be able to
            fill it in for you.
          </p>
          <p>
            Note that this decoder does not decode numerals, which are typically represented with the (0, 45) signal
            followed by another signal.
          </p>
          <p>
            More writing on how this project was made: <br />
            <a href="https://bobbiechen.com/blog/2020/5/28/the-making-of-semaphore-decoder?ref=bobbiec.github.io"
              >The Making of Semaphore Decoder</a
            >.
          </p>
        </div>
        <img src="semaphore-chart.png" class="one-half column" />
      </div>
    </div>

    <footer style="padding-bottom: 1rem; text-align: center">
      A project by <a href="https://bobbiechen.com?ref=bobbiec.github.io">Bobbie Chen</a>. See all
      <a href="/">web demos</a>.
    </footer>

    <script>
      Vue.component("flag", {
        props: ["position", "selected"],
        template: `
          <div
            v-bind:class="['flag', {'hover': hover, 'selected': selected}]"
            v-bind:style="style"
            v-on:click="$emit('flagClicked', position)"
            v-on:mouseover="hover = true"
            v-on:mouseleave="hover = false"
          >
            {{ position }}
          </div>`,
        data: function () {
          return {
            hover: false,
          }
        },
        computed: {
          style() {
            return {
              transform: `rotate(${90 + this.position}deg`,
            }
          },
        },
      })

      Vue.component("semaphore-decoder", {
        template: `
        <div style="max-width:450px">
          <div class="row flag-container">
            <flag
              v-for="number in numbers"
              v-bind:position="number"
              v-bind:selected="(number === firstFlag || number === secondFlag)"
              v-bind:key="number"
              v-on:flagClicked="flagClicked"
            ></flag>
          </div>
          <div class="info-container">
            <h1>Decoded: <strong> {{ match }} </strong></h1>
            <div class="u-full-width">
              {{ match === "?"      ? "Select two flags!" :
                 match === "(none)" ? "These two flags mean nothing."
                                    : "Click Add or hit . to add to the textbox." }}
            </div>
            <div class="row" style="display: flex">
              <input
                v-model="text"
                class="nine columns"
                type="text"
                placeholder="Your word here, eventually"
              />
              <button v-on:click="addLetter" class="three columns">
                Add
              </button>
            </div>
            <button v-on:click="text = ''" class="u-full-width">
              Clear textbox
            </button>
            <a
              v-bind:href="'https://nutrimatic.org/?q=%3C' + text + '%3E&go=Go'"
              target="_blank"
              class="button button-primary u-full-width"
              style="color:#555"
            >
              Anagram on Nutrimatic
            </a>
            <small class="u-full-width">
              Currently selected angles: {{ firstFlag }}, {{ secondFlag }}
            </small>
          </div>
        </div>
        `,
        data: function () {
          return {
            numbers: [0, 45, 90, 135, 180, 225, 270, 315],
            firstFlag: 180,
            secondFlag: 225,
            text: "",
          }
        },
        computed: {
          match() {
            switch (`${this.firstFlag}-${this.secondFlag}`) {
              case "0-90":
                return "J"
              case "0-135":
                return "V"
              case "0-180":
                return "D"
              case "0-225":
                return "K"
              case "0-270":
                return "P"
              case "0-315":
                return "T"

              case "45-90":
                return "W"
              case "45-135":
                return "X"
              case "45-180":
                return "E"
              case "45-225":
                return "L"
              case "45-270":
                return "Q"
              case "45-315":
                return "U"

              case "90-135":
                return "Z"
              case "90-180":
                return "F"
              case "90-225":
                return "M"
              case "90-270":
                return "R"
              case "90-315":
                return "Y"

              case "135-180":
                return "G"
              case "135-225":
                return "N"
              case "135-270":
                return "S"

              case "180-225":
                return "A"
              case "180-270":
                return "B"
              case "180-315":
                return "C"

              case "225-270":
                return "H"
              case "225-315":
                return "I"

              case "270-315":
                return "O"

              case "0-45":
              case "135-315":
                return "(none)"

              default:
                return "?"
            }
          },
        },
        methods: {
          flagClicked(position) {
            if (this.secondFlag || this.firstFlag === null) {
              if (position === this.firstFlag) {
                this.firstFlag = this.secondFlag
                this.secondFlag = null
              } else if (position === this.secondFlag) {
                this.secondFlag = null
              } else {
                this.firstFlag = position
                this.secondFlag = null
              }
            } else {
              if (position === this.firstFlag) {
                this.firstFlag = null
              } else if (position < this.firstFlag) {
                this.secondFlag = this.firstFlag
                this.firstFlag = position
              } else {
                this.secondFlag = position
              }
            }
          },
          keyPressed(event) {
            if (event.key !== ".") {
              return
            }

            if (!(this.firstFlag && this.secondFlag)) {
              return
            }

            this.addLetter()
            return
          },
          addLetter() {
            let match = this.match
            if (match.length === 1) {
              this.text += match.toLowerCase()
            }
          },
        },
        created: function () {
          document.addEventListener("keydown", this.keyPressed)
        },
        destroyed: function () {
          document.removeEventListener("keydown", this.keyPressed)
        },
      })

      var app = new Vue({
        el: "#app",
      })
    </script>
  </body>
</html>