index.html.in

   1 <!doctype html>
   2 <html lang="en-US">
   3   <head>
   4     <meta charset="utf-8">
   5     <meta name="viewport" content="width=device-width, initial-scale=1" />
   6     <link rel="icon"
   7           type="image/svg+xml"
   8           href="data:image/svg+xml;base64,@FAVICON@" />
   9
  10     <title>
  11       CharmBypass: got that transit equity
  12     </title>
  13
  14     <style>
  15       body {
  16         /* For consistency with the SVG */
  17         font-family: sans-serif;
  18       }
  19
  20       fieldset {
  21         margin-top: 1em;
  22         padding-top: 1em;
  23       }
  24
  25       input[type=submit] {
  26         margin-top: 1em;
  27         margin-bottom: 1em;
  28       }
  29
  30       legend {
  31         font-weight: bold;
  32       }
  33
  34       /* Display form errors for the one browser that doesn't support
  35        * them natively, mobile Firefox. We use "visibility" to toggle
  36        * it on and off, but "display" to hide it completely in non-
  37        * stupid web browsers. */
  38       #marc-form-errors {
  39         color: #a00;
  40         visibility: hidden;
  41         display: none;
  42       }
  43
  44       svg {
  45         /* Set the height to 100% of the screen, which we'll keep; and the
  46          * initial position to (0,0), which we're going to change
  47          * every time the window is resized, because the exact amount
  48          * that we have to slide the SVG to the left to get the ticket
  49          * into the center will change. */
  50         position: fixed;
  51         top: 0;
  52         left: 0;
  53         height: 100%;
  54
  55         /* Hide everything by default. We only show it once the user has
  56          * submitted the menu form */
  57         display: none;
  58       }
  59
  60       /* The blinking fade in/out animation for the ticket date and time */
  61       @keyframes blink {
  62         25% { opacity: 0.5; }
  63         50% { opacity: 0;   }
  64         75% { opacity: 0.5; }
  65       }
  66
  67       #tickettime, #ticketdate {
  68         /* 300 two-second blinks is ten minutes */
  69         animation: blink 2s linear 300;
  70       }
  71
  72       /* Define, load, and specify the custom font we use for the ticket
  73        * date, time, and service name. */
  74       @font-face {
  75         font-family: "CharmBypass Regular";
  76         src:
  77           url("data:font/woff2;base64,@CBPREGULAR@") format("woff2")
  78       }
  79
  80       #origindest, #servicename, #tickettime, #ticketdate, #codetext, #zone {
  81         font-family: "CharmBypass Regular", sans-serif;
  82       }
  83
  84       @font-face {
  85         font-family: "CharmBypass Bold";
  86         src:
  87           url("data:font/woff2;base64,@CBPBOLD@") format("woff2")
  88       }
  89
  90       #serviceid {
  91         font-family: "CharmBypass Bold", sans-serif;
  92       }
  93
  94       /************************/
  95       /* Scrolling animations */
  96       /************************/
  97
  98       /* Bus */
  99       @keyframes busroll {
 100         from { transform: translateX(0%);    }
 101         to   { transform: translateX(-100%); }
 102       }
 103
 104       #bus {
 105         animation: busroll 15s linear infinite;
 106       }
 107
 108
 109       /* Tram */
 110       @keyframes tramroll {
 111         from { transform: translateX(0%);   }
 112         to   { transform: translateX(100%); }
 113       }
 114
 115       #tram {
 116         animation: tramroll 15s linear infinite;
 117       }
 118
 119
 120       /* Train */
 121       @keyframes trainroll {
 122         from { transform: translateX(0%);   }
 123         to   { transform: translateX(100%); }
 124       }
 125
 126       #train {
 127         animation: trainroll 10s linear infinite;
 128       }
 129
 130
 131       /* Clouds */
 132       @keyframes cloudsfloat {
 133         from { transform: translateX(0%);   }
 134         to   { transform: translateX(-50%); }
 135       }
 136
 137       #clouds {
 138         animation: cloudsfloat 25s linear infinite;
 139       }
 140
 141       @keyframes cloudscopyfloat {
 142         from { transform: translateX(0%);   }
 143         to   { transform: translateX(-50%); }
 144       }
 145
 146       #cloudscopy {
 147         animation: cloudscopyfloat 25s linear infinite;
 148       }
 149
 150
 151       /* Trees */
 152       @keyframes treespass {
 153         from { transform: translateX(0%);   }
 154         to   { transform: translateX(-50%); }
 155       }
 156
 157       #trees {
 158         /* The trees move a little faster than the clouds */
 159         animation: treespass 16s linear infinite;
 160       }
 161
 162       @keyframes treescopypass {
 163         from { transform: translateX(0%);   }
 164         to   { transform: translateX(-50%); }
 165       }
 166
 167       #treescopy {
 168         /* The trees move a little faster than the clouds */
 169         animation: treescopypass 16s linear infinite;
 170       }
 171
 172
 173       /* City skyline */
 174       @keyframes cityscroll {
 175         from { transform: translateX(0%);   }
 176         to   { transform: translateX(-50%); }
 177       }
 178
 179       #city {
 180         /* The city moves faster than the clouds but slower
 181          * than the trees */
 182         animation: cityscroll 20s linear infinite;
 183       }
 184
 185       @keyframes citycopyscroll {
 186         from { transform: translateX(0%);   }
 187         to   { transform: translateX(-50%); }
 188       }
 189
 190       #citycopy {
 191         /* The city moves faster than the clouds but slower
 192          * than the trees */
 193         animation: citycopyscroll 20s linear infinite;
 194       }
 195     </style>
 196   </head>
 197
 198   <body>
 199     <div id="menu">
 200       <h1>CharmBypass</h1>
 201       <p><strong>got that <em>transit equity</em></strong></p>
 202
 203       <form>
 204         <fieldset>
 205           <legend>Local Bus, Light Rail, or Metro</legend>
 206           <div>
 207             <label for="code1">
 208               Daily security code (<a href="https://michael.orlitzky.com/articles/charmbypass_pt._1%3A_introduction.xhtml#daily-security-code">optional</a>):
 209             </label>
 210             <input id="code1"
 211                    name="code" value=""
 212                    type="text"
 213                    size="2"
 214                    minlength="2"
 215                    maxlength="2"
 216                    pattern="[a-zA-Z0-9]*" />
 217           </div>
 218           <input type="hidden" name="servicename" value="BaltimoreLink" />
 219           <input type="submit" name="go" value="Generate Ticket" />
 220         </fieldset>
 221       </form>
 222       <form>
 223         <fieldset>
 224           <legend>Commuter Bus</legend>
 225           <input type="hidden" name="serviceid" value="R" />
 226           <input type="hidden" name="servicename" value="Commuter Bus" />
 227
 228           <div>
 229             <label for="code2">
 230               Daily security code (<a href="https://michael.orlitzky.com/articles/charmbypass_pt._1%3A_introduction.xhtml#daily-security-code">optional</a>):
 231             </label>
 232             <input id="code2"
 233                    name="code" value=""
 234                    type="text"
 235                    size="2"
 236                    minlength="2"
 237                    maxlength="2"
 238                    pattern="[a-zA-Z0-9]*" />
 239           </div>
 240
 241           <p>
 242             Zone<sup>&dagger;</sup>:
 243           </p>
 244           <div>
 245             <input type="radio" required
 246                    name="zone"
 247                    id="zone1"
 248                    value="Zone 1" />
 249             <label for="zone1">Zone 1</label>
 250           </div>
 251           <div>
 252             <input type="radio" required
 253                    name="zone"
 254                    id="zone2"
 255                    value="Zone 2" />
 256             <label for="zone2">Zone 2</label>
 257           </div>
 258           <div>
 259             <input type="radio" required checked
 260                    name="zone"
 261                    id="zone3"
 262                    value="Zone 3" />
 263             <label for="zone3">Zone 3</label>
 264           </div>
 265           <div>
 266             <input type="radio" required
 267                    name="zone"
 268                    id="zone4"
 269                    value="Zone 4" />
 270             <label for="zone4">Zone 4</label>
 271           </div>
 272           <div>
 273             <input type="radio" required
 274                    name="zone"
 275                    id="zone5"
 276                    value="Zone 5" />
 277             <label for="zone5">Zone 5</label>
 278           </div>
 279
 280           <input type="submit" name="go" value="Generate Ticket" />
 281
 282           <p>
 283             <sup>&dagger;</sup>
 284             On the MTA's PDF schedule for your route
 285           </p>
 286         </fieldset>
 287       </form>
 288       <form>
 289         <fieldset>
 290           <legend>MARC Train</legend>
 291
 292           <div>
 293             <label for="code3">
 294               Daily security code (<a href="https://michael.orlitzky.com/articles/charmbypass_pt._1%3A_introduction.xhtml#daily-security-code">optional</a>):
 295             </label>
 296             <input id="code3"
 297                    name="code" value=""
 298                    type="text"
 299                    size="2"
 300                    minlength="2"
 301                    maxlength="2"
 302                    pattern="[a-zA-Z0-9]*" />
 303           </div>
 304
 305           <p>Origin:</p>
 306           <div>
 307             <input type="radio" required checked
 308                    name="origin"
 309                    id="origin_BAL"
 310                    value="BAL" />
 311             <label for="origin_BAL">Baltimore/Penn (Penn Line)</label>
 312           </div>
 313           <div>
 314             <input type="radio" required
 315                    name="origin"
 316                    id="origin_BCA"
 317                    value="BCA" />
 318             <label for="origin_BCA">Baltimore/Camden (Camden Line)</label>
 319           </div>
 320           <div>
 321             <input type="radio" required
 322                    name="origin"
 323                    id="origin_BWE"
 324                    value="BWE" />
 325             <label for="origin_BWE">Bowie State (Penn Line)</label>
 326           </div>
 327           <div>
 328             <input type="radio" required
 329                    name="origin"
 330                    id="origin_BWI"
 331                    value="BWI" />
 332             <label for="origin_BWI">BWI Airport (Penn Line)</label>
 333           </div>
 334           <div>
 335             <input type="radio" required
 336                    name="origin"
 337                    id="origin_CPK"
 338                    value="CPK" />
 339             <label for="origin_CPK">College Park (Camden Line)</label>
 340           </div>
 341           <div>
 342             <input type="radio" required
 343                    name="origin"
 344                    id="origin_FRC"
 345                    value="FRC" />
 346             <label for="origin_FRC">Frederick (Brunswick Line)</label>
 347           </div>
 348           <div>
 349             <input type="radio" required
 350                    name="origin"
 351                    id="origin_HAE"
 352                    value="HAE" />
 353             <label for="origin_HAE">Halethorpe (Penn Line)</label>
 354           </div>
 355           <div>
 356             <input type="radio" required
 357                    name="origin"
 358                    id="origin_SEB"
 359                    value="SEB" />
 360             <label for="origin_SEB">Seabrook (Penn Line)</label>
 361           </div>
 362           <div>
 363             <input type="radio" required
 364                    name="origin"
 365                    id="origin_WAS"
 366                    value="WAS" />
 367             <label for="origin_WAS">Washington D.C.</label>
 368           </div>
 369           <div>
 370             <input type="radio" required
 371                    name="origin"
 372                    id="origin_WBL"
 373                    value="WBL" />
 374             <label for="origin_WBL">West Baltimore (Penn Line)</label>
 375           </div>
 376
 377           <p>Destination:</p>
 378           <div>
 379             <input type="radio" required
 380                    name="destination"
 381                    id="destination_BAL"
 382                    value="BAL" />
 383             <label for="destination_BAL">Baltimore/Penn (Penn Line)</label>
 384           </div>
 385           <div>
 386             <input type="radio" required
 387                    name="destination"
 388                    id="destination_BCA"
 389                    value="BCA" />
 390             <label for="destination_BCA">Baltimore/Camden (Camden Line)</label>
 391           </div>
 392           <div>
 393             <input type="radio" required
 394                    name="destination"
 395                    id="destination_BWE"
 396                    value="BWE" />
 397             <label for="destination_BWE">Bowie State (Penn Line)</label>
 398           </div>
 399           <div>
 400             <input type="radio" required
 401                    name="destination"
 402                    id="destination_BWI"
 403                    value="BWI" />
 404             <label for="destination_BWI">BWI Airport (Penn Line)</label>
 405           </div>
 406           <div>
 407             <input type="radio" required
 408                    name="destination"
 409                    id="destination_CPK"
 410                    value="CPK" />
 411             <label for="destination_CPK">College Park (Camden Line)</label>
 412           </div>
 413           <div>
 414             <input type="radio" required
 415                    name="destination"
 416                    id="destination_FRC"
 417                    value="FRC" />
 418             <label for="destination_FRC">Frederick (Brunswick Line)</label>
 419           </div>
 420           <div>
 421             <input type="radio" required
 422                    name="destination"
 423                    id="destination_HAE"
 424                    value="HAE" />
 425             <label for="destination_HAE">Halethorpe (Penn Line)</label>
 426           </div>
 427           <div>
 428             <input type="radio" required
 429                    name="destination"
 430                    id="destination_SEB"
 431                    value="SEB" />
 432             <label for="destination_SEB">Seabrook (Penn Line)</label>
 433           </div>
 434           <div>
 435             <input type="radio" required checked
 436                    name="destination"
 437                    id="destination_WAS"
 438                    value="WAS" />
 439             <label for="destination_WAS">Washington D.C.</label>
 440           </div>
 441           <div>
 442             <input type="radio" required
 443                    name="destination"
 444                    id="destination_WBL"
 445                    value="WBL" />
 446             <label for="destination_WBL">West Baltimore (Penn Line)</label>
 447           </div>
 448
 449           <p id="marc-form-errors">OK</p>
 450
 451           <input type="hidden" name="serviceid" value="R" />
 452           <input type="hidden" name="servicename" value="MARC Train" />
 453           <input type="submit"
 454                  name="go"
 455                  id="marc-submit"
 456                  value="Generate Ticket" />
 457         </fieldset>
 458       </form>
 459
 460       <p>
 461         About CharmBypass:
 462       </p>
 463       <ol>
 464         <li>
 465           <a href="https://michael.orlitzky.com/articles/charmbypass_pt._1%3A_introduction.xhtml">
 466             Introduction
 467           </a>
 468         </li>
 469         <li>
 470           <a href="https://michael.orlitzky.com/articles/charmbypass_pt._2%3A_analysis.xhtml">
 471             Analysis
 472           </a>
 473         </li>
 474       </ol>
 475     </div>
 476
 477     @SVGDATA@
 478
 479     <script>
 480
 481       /**
 482        * Center the ticket within the browser by translating the SVG
 483        * until the ticket and the viewport centerlines coincide.
 484        */
 485       function center_ticket() {
 486         /* We're relying on the SVG being the full height of the
 487          * viewport already, and on the aspect ratio being
 488          * preserved. First, find the center of the ticket. */
 489         const r = document.getElementById("ticket").getBoundingClientRect();
 490         const c = r.left + (r.width / 2);
 491
 492         /* That's the center-line of the ticket. We want to move it to
 493          * the center-line of the viewport. */
 494         const vc = document.documentElement.clientWidth / 2;
 495
 496         /* This is how much we need to translate the SVG */
 497         const hdelta = vc - c;
 498
 499         /* But before we can set the absolute left-coordinate of the
 500          * SVG, we need to know where it is now. Note: without the
 501          * "px" this doesn't default to pixels like CSS does. */
 502         const svg = document.querySelector("svg");
 503         svg.style.left = (svg.getBoundingClientRect().left + hdelta) + "px";
 504       }
 505
 506
 507       /**
 508        * Set the service identifier from the querystring if it's there.
 509        * Otherwise, leave it at the default of "F".
 510        */
 511       function set_service_id() {
 512         const sid = document.getElementById("serviceid");
 513
 514         /* Get the "serviceid" from the querystring if it's there */
 515         const params = new URLSearchParams(document.location.search);
 516         if (params.get("serviceid")) {
 517           sid.textContent = params.get("serviceid");
 518         }
 519       }
 520
 521
 522       /**
 523        * Set the service name from the querystring if it's there.
 524        * Otherwise, leave it at the default of "BaltimoreLink".
 525        */
 526       function set_service_name() {
 527         const sid = document.getElementById("servicename");
 528
 529         /* Get the "servicename" from the querystring if it's there */
 530         const params = new URLSearchParams(document.location.search);
 531         if (params.get("servicename")) {
 532           sid.textContent = params.get("servicename");
 533         }
 534       }
 535
 536
 537       /**
 538        * Set the zone from the given "zone" parameter and then unhide it.
 539        */
 540       function set_zone(zone) {
 541         const z = document.getElementById("zone");
 542
 543         z.textContent = zone;
 544         z.style.display = "block"; /* hidden by default */
 545       }
 546
 547
 548       /**
 549        * Resize the  ticket background based on the service name.
 550        * The BaltimoreLink, Commuter Bus, and MARC Train tickets
 551        * are all different heights and are arranged vertically a
 552        * bit different.
 553        *
 554        * Rather than design three completelty separate tickets and
 555        * then have to keep track of which one we're using, I have
 556        * instead decided to use one ticket and to reposition it
 557        * on-the-fly based on the service name. This is necessarily
 558        * a bit ugly because it involves a lot of magic numbers that
 559        * can only be explained if you open up inkscape with a CharmPass
 560        * screenshot to see where things belong and how to get them there.
 561        *
 562        * The SVG was designed with BaltimoreLink in mind, so this
 563        * is a no-op if the service is BaltimoreLink.
 564        */
 565       function resize_ticket() {
 566         /* Get the "servicename" from the querystring if it's there */
 567         const params = new URLSearchParams(document.location.search);
 568         const tbg = document.getElementById("ticketbg");
 569         const t = document.getElementById("ticket");
 570         const sn = document.getElementById("servicename");
 571
 572         if (params.get("servicename") === "Commuter Bus") {
 573           /* The top of the background is initially at y=246.859, and
 574            * we scale it by a factor of 1.12 to y=276.482 for a change
 575            * of 29.623. So after we scale it, we translate it upwards
 576            * by that amount to put it back where it started. */
 577           tbg.setAttribute("transform", "translate(0 -29.623) scale(1 1.12)");
 578
 579           /* Now translate the entire ticket up by the magic amount, 1/5
 580            * of the size change we made to the background. This ratio
 581            * was found by measuring pixels in side-by-side screenshots
 582            * of BaltimoreLink and Commuter Bus tickets. */
 583           t.setAttribute("transform", "translate(0 -9.33)");
 584
 585           /* More magic numbers discovered by comparing the two
 586            * tickets overlayed in inkscape */
 587           sn.setAttribute("transform", "translate(0 64.28)");
 588         }
 589         else if (params.get("servicename") === "MARC Train") {
 590           /* insane tricks are explained above */
 591           tbg.setAttribute("transform",
 592                            "translate(0 -72.378) scale(1 1.2932)");
 593           t.setAttribute("transform", "translate(0 -67.17)");
 594           sn.setAttribute("transform", "translate(0 131.0)");
 595         }
 596       }
 597
 598
 599       /**
 600        * Set the security code from the querystring if it was given;
 601        * otherwise generate a random code.
 602        */
 603       function set_code() {
 604         const ct = document.getElementById("codetext");
 605
 606         /* Get the "code" from the querystring if it's there */
 607         const params = new URLSearchParams(document.location.search);
 608         if (params.get("code")) {
 609           ct.textContent = params.get("code").toUpperCase();
 610         }
 611         else {
 612           /* Otherwise, use a random code */
 613           const bucket = ["0","1","2","3","4","5","6","7","8","9",
 614                           "A","B","C","D","E","F","G","H","I","J",
 615                           "K","L","M","N","O","P","Q","R","S","T",
 616                           "U","V","W","X","Y","Z"];
 617
 618           /* Two random ints between 0 and 35 */
 619           const i1 = Math.floor(Math.random() * 36);
 620           const i2 = Math.floor(Math.random() * 36);
 621           const d1 = bucket[i1];
 622           const d2 = bucket[i2];
 623           ct.textContent = d1 + d2;
 624         }
 625       }
 626
 627
 628       /**
 629        * Center the security code within its container.
 630        *
 631        * Some codes like "II" and "WW" can take up wildly different
 632        * amounts of horizonetal space, but they should always be
 633        * centered inside their little red box. This turns out to be
 634        * harder than it sounds because we can only find the width of
 635        * the code in browser coordinates, whereas its "x" coordinate
 636        * is in SVG coordinates. Anyway, we do it.
 637        */
 638       function center_code() {
 639         /* Center the security code inside its red box */
 640         const ct = document.getElementById("codetext");
 641         const bg = document.getElementById("codebg");
 642
 643         /* First, find the center of the red box */
 644         const r1 = bg.getBoundingClientRect();
 645         const c1 = r1.left + (r1.width / 2);
 646
 647         /* Now the center of the code text */
 648         const r2 = ct.getBoundingClientRect();
 649         const c2 = r2.left + (r2.width / 2);
 650
 651         /* What do we add to c2 to make it equal to c1? */
 652         const hdelta = c1 - c2;
 653
 654         /* We've measured everything so far in "client rect"
 655          * coordinates, because that's the only available measurement
 656          * we have for the width of the <text> element. But when we
 657          * reposition that <text> element, it will be by adjusting its
 658          * "x" attribute, and that attribute uses a different coordinate
 659          * system than the client rect does. Specifically, "x" refers to
 660          * an offset within the SVG's coordinate system, and the client
 661          * rect coordinates are pixels on-screen. To convert between the
 662          * two, we can take the "width" attribute of the background
 663          * element and compare it to the width of the background
 664          * element's client rect. Since the size of the background is
 665          * fixed, this should give us a multiplier that turns client rect
 666          * distances (what we have) into SVG distances (what we want) */
 667         const client_to_svg = parseFloat(bg.getAttribute("width"))/r1.width;
 668
 669         /* Convert hdelta from client rect to SVG coordinates */
 670         const svg_hdelta = hdelta * client_to_svg;
 671
 672         /* Since this <text> element has an "x" attribute it's easier for
 673          * us to shift that than it is to mess with the "left" style. */
 674         ct.setAttribute("x", parseFloat(ct.getAttribute("x")) + svg_hdelta);
 675       }
 676
 677       /**
 678        * Set the ticket's expiration date and time.
 679        *
 680        * BaltimoreLink and MARC Train tickets expire after 90 minutes;
 681        * while Commuter Bus tickets expire after 10 minutes.
 682        */
 683       function set_ticket_expiry() {
 684         /* There are two parameters, time and date, that we store in one
 685          * underlying "date" variable. */
 686         const date = new Date();
 687
 688         /* BaltimoreLink and MARC Train */
 689         let minutes = 90;
 690         const params = new URLSearchParams(document.location.search);
 691         if (params.get("servicename") === "Commuter Bus") {
 692           /* Commuter bus tickets are only valid for ten minutes */
 693           minutes = 10;
 694         }
 695
 696         /* We use the low-level get/setTime to change the number of
 697          * milliseconds since the epoch that this date represents
 698          * Obviously correct, and avoids all suspicious corner cases
 699          * for a few more decades. */
 700         date.setTime(date.getTime() + (minutes*60*1000));
 701
 702         tt = document.getElementById("tickettime");
 703         tt.textContent = date.toLocaleTimeString();
 704
 705         const td = document.getElementById("ticketdate");
 706         const dateopts = {
 707           day: "2-digit",
 708           month: "2-digit",
 709           year: "2-digit"
 710         };
 711         td.textContent = date.toLocaleDateString("en-US", dateopts);
 712       }
 713
 714
 715       /**
 716        * Swap the day/night sky colors.
 717        *
 718        * We use CSS classes to keep track of the current state because
 719        * it's a tiny bit cleaner than a global variable, but for some
 720        * reason we can't use those same classes to actually change the
 721        * color. (The classes, change, but the color doesn't.) Rather
 722        * than waste time trying to explain this, we just set the "fill"
 723        * attribute ourselves whenever we swap classes.
 724        */
 725       function swap_day_night() {
 726         const sky = document.getElementById("sky");
 727
 728         if (sky.getAttribute("class") === "night") {
 729           sky.setAttribute("fill", "#efb02f");
 730           sky.setAttribute("class", "day");
 731         }
 732         else {
 733           /* Put this case second so that the first time the
 734            * screen is tapped (when there are no classes on
 735            * the sky element) the color still changes. */
 736           sky.setAttribute("fill", "#143b66");
 737           sky.setAttribute("class", "night");
 738         }
 739       }
 740
 741
 742       /**
 743        * Compute the zone (string) for the given origin/destination pair.
 744        *
 745        * If we don't know it or if you chose in invalid pair (destination
 746        * not on the same line as your origin?) then null is returned.
 747        */
 748       function compute_marc_zone(src, dest) {
 749
 750         /* Sorted on the first component, then the second.
 751          *
 752          * Key:
 753          *
 754          *   $6.00 => 1
 755          *   $7.00 => 2
 756          *   $8.00 => 3
 757          *   $9.00 => 4
 758          */
 759         const zone_map = {
 760           BAL_BWE: 2,
 761           BAL_BWI: 1,
 762           BAL_HAE: 1,
 763           BAL_SEB: 3,
 764           BAL_WAS: 4,
 765           BAL_WBL: 1,
 766           BCA_CPK: 3,
 767           BCA_WAS: 4,
 768           BWE_BWI: 1,
 769           BWE_HAE: 1,
 770           BWE_SEB: 1,
 771           BWE_WAS: 2,
 772           BWE_WBL: 2,
 773           BWI_HAE: 1,
 774           BWI_SEB: 2,
 775           BWI_WAS: 3,
 776           BWI_WBL: 1,
 777           FRC_WAS: 4,
 778           HAE_SEB: 2,
 779           HAE_WAS: 3,
 780           HAE_WBL: 1,
 781           SEB_WAS: 1,
 782           SEB_WBL: 3,
 783           WAS_WBL: 4
 784         };
 785
 786         /* Forward direction key for zone_map */
 787         const fwd = src + "_" +  dest;
 788
 789         /* Reverse direction key for zone_map. The zone_map only
 790          * has them listed in one direction, so we check both
 791          * directions here. */
 792         const rev = dest + "_" +  src;
 793
 794         /* The default. Obviously wrong for when we don't
 795          * have the necessary data. */
 796         let zone = -1;
 797
 798         if (zone_map[fwd]) {
 799           zone = zone_map[fwd];
 800         }
 801         else if (zone_map[rev]) {
 802           zone = zone_map[rev];
 803         }
 804
 805         /* Convert the number to a string */
 806         switch (zone) {
 807           case 1:
 808             return "One Zone";
 809           case 2:
 810             return "Two Zone";
 811           case 3:
 812             return "Three Zone";
 813           case 4:
 814             return "Four Zone";
 815           default:
 816             return null;
 817         }
 818       }
 819
 820
 821       /**
 822        * Compute and set the zone.
 823        *
 824        * We can be given a zone in two ways. First, on Commuter Bus
 825        * tickets, it is given explicitly via the querystring. But
 826        * It can also be specified implicitly via the origin and
 827        * destination on a MARC Train ticket. Here we try both and
 828        * then call set_zone() with the result if something worked.
 829        */
 830       function compute_and_set_zone() {
 831         const params = new URLSearchParams(document.location.search);
 832         const src = params.get("origin");
 833         const dest = params.get("destination");
 834
 835         if (src && dest) {
 836           /* MARC Train. We can assume that compute_marc_zone() doesn't
 837            * return null because that's part of our form validation. */
 838           const zone = compute_marc_zone(src, dest);
 839           set_zone(zone);
 840         }
 841         else if (params.get("zone")) {
 842           /* Commuter Bus */
 843           set_zone(params.get("zone"));
 844         }
 845       }
 846
 847
 848       /**
 849        * Set the origin and destination for the MARC Train if they
 850        * were provided, and unhide them if so.
 851        */
 852       function set_marc_origin_destination() {
 853         const params = new URLSearchParams(document.location.search);
 854         if (!params.get("origin") || !params.get("destination")) {
 855           return;
 856         }
 857
 858         const src = params.get("origin");
 859         const dest = params.get("destination");
 860
 861         /* origindest contains both the origin and destination */
 862         const origindest = document.getElementById("origindest");
 863
 864         const origin = document.getElementById("origin");
 865         const destination = document.getElementById("destination");
 866
 867         origin.textContent = params.get("origin");
 868         destination.textContent = params.get("destination");
 869
 870         origindest.style.display = "block"; /* hidden by default */
 871       }
 872
 873
 874       /**
 875        * Hide the menu and display the ticket. This is what happens
 876        * when you submit the form.
 877        */
 878       function go() {
 879         /* To create our "window" onto the scene, we're going to slide the
 880          * SVG off the left-hand side of the screen, and we don't want
 881          * scroll bars to appear. */
 882         document.body.style.overflow = "hidden";
 883         document.body.style.margin = "0";
 884         document.body.style.padding = "0";
 885
 886         const svg = document.querySelector("svg");
 887         const menu = document.getElementById("menu");
 888         svg.style.display = "initial";
 889         menu.style.display = "none";
 890       }
 891
 892       /**
 893        * Determine if the user agent is mobile Firefox.
 894        */
 895       function ua_is_mobile_ff() {
 896         const ua = navigator.userAgent.toLowerCase();
 897         return (ua.includes("firefox") && ua.includes("mobile"));
 898       }
 899
 900       /**
 901        * Validate the MARC form's origin/destination.
 902        *
 903        * We don't want the user to be able to choose a pair of stops that
 904        * aren't actually connected by the same MARC line. If we don't have
 905        * zone information for the (origin,destination) pair, that indicates
 906        * that it's probably not a valid choice; otherwise I would have
 907        * filled in the information from the CharmPass app already.
 908        *
 909        * All browsers except mobile Firefox let us call setCustomValidity()
 910        * to provide an error message that is displayed if the user tries
 911        * to submit invalid choices. But amazingly, mobile Firefox does not:
 912        *
 913        *   https://bugzilla.mozilla.org/show_bug.cgi?id=1510450
 914        *
 915        * Instead we have to work around it (in that one browser) by
 916        * showing/hiding a paragraph that we fill with the errors.
 917        */
 918       function validate_origin_destination(event) {
 919         const origins = document.getElementsByName("origin");
 920         const destinations = document.getElementsByName("destination");
 921         const mfe = document.getElementById("marc-form-errors");
 922         const marcsubmit = document.getElementById("marc-submit");
 923
 924         if (ua_is_mobile_ff()) {
 925           /* Even though this is only for one browser, empty paragraphs
 926            * are handled inconsistently and should be avoided as a rule.
 927            * So, we make it say "OK" before we hide it. */
 928           mfe.textContent = "OK";
 929           mfe.style.visibility = "hidden";
 930           marcsubmit.disabled = false;
 931         }
 932
 933         let src = null;
 934         let dest = null;
 935         origins.forEach((x) => { if (x.checked) src = x; })
 936         destinations.forEach((x) => {
 937           if (x.checked) dest = x;
 938
 939           /* clear all errors before possibly setting one */
 940           x.setCustomValidity('');
 941         })
 942
 943         if (src.value === dest.value) {
 944           let err = "Origin and destination are the same";
 945           dest.setCustomValidity(err);
 946
 947           if (ua_is_mobile_ff()) {
 948             mfe.textContent = err;
 949             mfe.style.visibility = "visible";
 950             marcsubmit.disabled = true;
 951           }
 952         }
 953         else if (compute_marc_zone(src.value, dest.value) === null) {
 954           let err = "Origin and destination are on different lines";
 955           dest.setCustomValidity(err);
 956
 957           if (ua_is_mobile_ff()) {
 958             mfe.textContent = err;
 959             mfe.style.visibility = "visible";
 960             marcsubmit.disabled = true;
 961           }
 962         }
 963       }
 964
 965       /*****************************************************/
 966       /* Add event handlers for all of the functions above */
 967       /*****************************************************/
 968
 969       const params = new URLSearchParams(document.location.search);
 970       if (params.get("go")) {
 971         /* First unhide the SVG (swap it with the form) */
 972         window.addEventListener("load", go);
 973
 974         /* Center the ticket once when the page has loaded */
 975         window.addEventListener("load", center_ticket);
 976
 977         /* Re-center the ticket when the window is resized */
 978         window.addEventListener("resize", center_ticket);
 979
 980         /* Set the service identifier when the page has loaded */
 981         window.addEventListener("load", set_service_id);
 982
 983         /* Set the service name when the page has loaded */
 984         window.addEventListener("load", set_service_name);
 985
 986         /* Resize the ticket background if necessary */
 987         window.addEventListener("load", resize_ticket);
 988
 989         /* Set the security code text when the page has loaded */
 990         window.addEventListener("load", set_code);
 991
 992         /* Center the security code text when the page has loaded; in
 993          * particular, after we set the code. */
 994         window.addEventListener("load", center_code);
 995
 996         /* Set the ticket expiration date/time upon page load */
 997         window.addEventListener("load", set_ticket_expiry);
 998
 999         /* Set the MARC Train origin and destination, if applicable */
1000         window.addEventListener("load", set_marc_origin_destination);
1001
1002         /* Compute and set the zone, if applicable */
1003         window.addEventListener("load", compute_and_set_zone);
1004
1005         /* Swap colors when the screen is tapped */
1006         document.body.addEventListener("click", swap_day_night);
1007       }
1008       else {
1009         /* If we haven't submitted the form yet, set up change handlers
1010          * for the origin/destination radio buttons that validate that
1011          * the origin and destination are on the same line. */
1012         document.getElementsByName("origin").forEach(
1013          (x) => x.addEventListener("change", validate_origin_destination)
1014         );
1015         document.getElementsByName("destination").forEach(
1016          (x) => x.addEventListener("change", validate_origin_destination)
1017         );
1018
1019         /* Also do it when the page loads, because firefox likes to
1020          * remember your selection even after the page reloads. */
1021         window.addEventListener("load", validate_origin_destination);
1022
1023         /* Finally, we have to babysit mobile Firefox, who doesn't
1024          * support HTML5 form validation going into 2024. Turn on
1025          * the little form errors paragraph so we can toggle its
1026          * visibility (and make it display the error) when the user
1027          * makes an invalid selection. */
1028         window.addEventListener("load", () => {
1029           if (ua_is_mobile_ff()) {
1030             const mfe = document.getElementById("marc-form-errors");
1031             mfe.style.display = "block";
1032           }
1033         });
1034       }
1035
1036     </script>
1037   </body>
1038 </html>