| 1 | /* ***** BEGIN LICENSE BLOCK ***** |
| 2 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1 |
| 3 | * |
| 4 | * The contents of this file are subject to the Mozilla Public License Version |
| 5 | * 1.1 (the "License"); you may not use this file except in compliance with |
| 6 | * the License. You may obtain a copy of the License at |
| 7 | * http://www.mozilla.org/MPL/ |
| 8 | * |
| 9 | * Software distributed under the License is distributed on an "AS IS" basis, |
| 10 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License |
| 11 | * for the specific language governing rights and limitations under the |
| 12 | * License. |
| 13 | * |
| 14 | * The Original Code is Lantea mapping/tracking web app. |
| 15 | * |
| 16 | * The Initial Developer of the Original Code is |
| 17 | * Robert Kaiser <kairo@kairo.at>. |
| 18 | * Portions created by the Initial Developer are Copyright (C) 2011 |
| 19 | * the Initial Developer. All Rights Reserved. |
| 20 | * |
| 21 | * Contributor(s): |
| 22 | * Robert Kaiser <kairo@kairo.at> |
| 23 | * |
| 24 | * Alternatively, the contents of this file may be used under the terms of |
| 25 | * either the GNU General Public License Version 2 or later (the "GPL"), or |
| 26 | * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), |
| 27 | * in which case the provisions of the GPL or the LGPL are applicable instead |
| 28 | * of those above. If you wish to allow use of your version of this file only |
| 29 | * under the terms of either the GPL or the LGPL, and not to allow others to |
| 30 | * use your version of this file under the terms of the MPL, indicate your |
| 31 | * decision by deleting the provisions above and replace them with the notice |
| 32 | * and other provisions required by the GPL or the LGPL. If you do not delete |
| 33 | * the provisions above, a recipient may use your version of this file under |
| 34 | * the terms of any one of the MPL, the GPL or the LGPL. |
| 35 | * |
| 36 | * ***** END LICENSE BLOCK ***** */ |
| 37 | |
| 38 | var gCanvas, gContext; |
| 39 | |
| 40 | var gTileSize = 256; |
| 41 | var gMaxZoom = 18; // The minimum is 0. |
| 42 | |
| 43 | var gMapStyles = { |
| 44 | // OSM tile usage policy: http://wiki.openstreetmap.org/wiki/Tile_usage_policy |
| 45 | // Find some more OSM ones at http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#Tile_servers |
| 46 | osm_mapnik: |
| 47 | {name: "OpenStreetMap (Mapnik)", |
| 48 | url: "http://tile.openstreetmap.org/{z}/{x}/{y}.png", |
| 49 | copyright: 'Map data and imagery © <a href="http://www.openstreetmap.org/">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>'}, |
| 50 | osm_tilesathome: |
| 51 | {name: "OpenStreetMap (OSMarender)", |
| 52 | url: "http://tah.openstreetmap.org/Tiles/tile/{z}/{x}/{y}.png", |
| 53 | copyright: 'Map data and imagery © <a href="http://www.openstreetmap.org/">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>'}, |
| 54 | mapquest_open: |
| 55 | {name: "MapQuest OSM", |
| 56 | url: "http://otile1.mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.png", |
| 57 | copyright: 'Data, imagery and map information provided by MapQuest, <a href="http://www.openstreetmap.org/">OpenStreetMap</a> and contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>.'}, |
| 58 | mapquest_aerial: |
| 59 | {name: "MapQuest Open Aerial", |
| 60 | url: "http://oatile1.mqcdn.com/naip/{z}/{x}/{y}.png", |
| 61 | copyright: 'Data, imagery and map information provided by MapQuest, <a href="http://www.openstreetmap.org/">OpenStreetMap</a> and contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>.'}, |
| 62 | google_map: |
| 63 | {name: "Google Maps", |
| 64 | url: " http://mt1.google.com/vt/x={x}&y={y}&z={z}", |
| 65 | copyright: 'Map data and imagery © <a href="http://maps.google.com/">Google</a>'}, |
| 66 | }; |
| 67 | var gActiveMap = "osm_mapnik"; |
| 68 | |
| 69 | var gPos = {x: 35630000.0, // Current position in the map in pixels at the maximum zoom level (18) |
| 70 | y: 23670000.0, // The range is 0-67108864 (2^gMaxZoom * gTileSize) |
| 71 | z: 5}; // This could be fractional if supported being between zoom levels. |
| 72 | |
| 73 | var gLastMouseX = 0; |
| 74 | var gLastMouseY = 0; |
| 75 | var gZoomFactor; |
| 76 | |
| 77 | // Used as an associative array. |
| 78 | // The keys have to be strings, ours will be "xindex,yindex,zindex" e.g. "13,245,12". |
| 79 | var gTiles = {}; |
| 80 | var gLoadingTile; |
| 81 | |
| 82 | var gMapPrefsLoaded = false; |
| 83 | |
| 84 | var gDragging = false; |
| 85 | var gZoomTouchID; |
| 86 | |
| 87 | var gGeoWatchID; |
| 88 | var gTrack = []; |
| 89 | var gLastTrackPoint; |
| 90 | var gCenterPosition = true; |
| 91 | |
| 92 | function initMap() { |
| 93 | gCanvas = document.getElementById("map"); |
| 94 | gContext = gCanvas.getContext("2d"); |
| 95 | if (!gActiveMap) |
| 96 | gActiveMap = "osm_mapnik"; |
| 97 | |
| 98 | var loopCnt = 0; |
| 99 | var getPersistentPrefs = function() { |
| 100 | if (mainDB) { |
| 101 | gPrefs.get("position", function(aValue) { |
| 102 | if (aValue) { |
| 103 | gPos = aValue; |
| 104 | drawMap(); |
| 105 | } |
| 106 | }); |
| 107 | gPrefs.get("center_map", function(aValue) { |
| 108 | if (aValue === undefined) |
| 109 | document.getElementById("centerCheckbox").checked = true; |
| 110 | else |
| 111 | document.getElementById("centerCheckbox").checked = aValue; |
| 112 | setCentering(document.getElementById("centerCheckbox")); |
| 113 | }); |
| 114 | gPrefs.get("tracking_enabled", function(aValue) { |
| 115 | if (aValue === undefined) |
| 116 | document.getElementById("trackCheckbox").checked = true; |
| 117 | else |
| 118 | document.getElementById("trackCheckbox").checked = aValue; |
| 119 | setTracking(document.getElementById("trackCheckbox")); |
| 120 | }); |
| 121 | gMapPrefsLoaded = true; |
| 122 | } |
| 123 | else |
| 124 | setTimeout(getPersistentPrefs, 100); |
| 125 | loopCnt++; |
| 126 | if (loopCnt > 20) { |
| 127 | gMapPrefsLoaded = true; |
| 128 | return; |
| 129 | } |
| 130 | }; |
| 131 | getPersistentPrefs(); |
| 132 | |
| 133 | gCanvas.addEventListener("mouseup", mapEvHandler, false); |
| 134 | gCanvas.addEventListener("mousemove", mapEvHandler, false); |
| 135 | gCanvas.addEventListener("mousedown", mapEvHandler, false); |
| 136 | gCanvas.addEventListener("mouseout", mapEvHandler, false); |
| 137 | |
| 138 | gCanvas.addEventListener("touchstart", mapEvHandler, false); |
| 139 | gCanvas.addEventListener("touchmove", mapEvHandler, false); |
| 140 | gCanvas.addEventListener("touchend", mapEvHandler, false); |
| 141 | gCanvas.addEventListener("touchcancel", mapEvHandler, false); |
| 142 | gCanvas.addEventListener("touchleave", mapEvHandler, false); |
| 143 | |
| 144 | gCanvas.addEventListener("DOMMouseScroll", mapEvHandler, false); |
| 145 | gCanvas.addEventListener("mousewheel", mapEvHandler, false); |
| 146 | |
| 147 | document.getElementById("copyright").innerHTML = |
| 148 | gMapStyles[gActiveMap].copyright; |
| 149 | |
| 150 | gLoadingTile = new Image(); |
| 151 | gLoadingTile.src = "style/loading.png"; |
| 152 | } |
| 153 | |
| 154 | function resizeAndDraw() { |
| 155 | var viewportWidth = window.innerWidth; |
| 156 | var viewportHeight = window.innerHeight; |
| 157 | |
| 158 | var canvasWidth = viewportWidth * 0.98; |
| 159 | var canvasHeight = (viewportHeight - 100) * 0.98; |
| 160 | gCanvas.style.position = "fixed"; |
| 161 | gCanvas.width = canvasWidth; |
| 162 | gCanvas.height = canvasHeight; |
| 163 | drawMap(); |
| 164 | } |
| 165 | |
| 166 | function zoomIn() { |
| 167 | if (gPos.z < gMaxZoom) { |
| 168 | gPos.z++; |
| 169 | drawMap(); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | function zoomOut() { |
| 174 | if (gPos.z > 0) { |
| 175 | gPos.z--; |
| 176 | drawMap(); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | function gps2xy(aLatitude, aLongitude) { |
| 181 | var maxZoomFactor = Math.pow(2, gMaxZoom) * gTileSize; |
| 182 | var convLat = aLatitude * Math.PI / 180; |
| 183 | var rawY = (1 - Math.log(Math.tan(convLat) + |
| 184 | 1 / Math.cos(convLat)) / Math.PI) / 2 * maxZoomFactor; |
| 185 | var rawX = (aLongitude + 180) / 360 * maxZoomFactor; |
| 186 | return {x: Math.round(rawX), |
| 187 | y: Math.round(rawY)}; |
| 188 | } |
| 189 | |
| 190 | function xy2gps(aX, aY) { |
| 191 | var maxZoomFactor = Math.pow(2, gMaxZoom) * gTileSize; |
| 192 | var n = Math.PI - 2 * Math.PI * aY / maxZoomFactor; |
| 193 | return {latitude: 180 / Math.PI * |
| 194 | Math.atan(0.5 * (Math.exp(n) - Math.exp(-n))), |
| 195 | longitude: aX / maxZoomFactor * 360 - 180}; |
| 196 | } |
| 197 | |
| 198 | function setMapStyle() { |
| 199 | var mapSel = document.getElementById("mapSelector"); |
| 200 | if (mapSel.selectedIndex >= 0 && gActiveMap != mapSel.value) { |
| 201 | gActiveMap = mapSel.value; |
| 202 | gTiles = {}; |
| 203 | drawMap(); |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | // A sane mod function that works for negative numbers. |
| 208 | // Returns a % b. |
| 209 | function mod(a, b) { |
| 210 | return ((a % b) + b) % b; |
| 211 | } |
| 212 | |
| 213 | function normaliseIndices(x, y, z) { |
| 214 | var zoomFactor = Math.pow(2, z); |
| 215 | return {x: mod(x, zoomFactor), |
| 216 | y: mod(y, zoomFactor), |
| 217 | z: z}; |
| 218 | } |
| 219 | |
| 220 | function tileURL(x, y, z) { |
| 221 | var norm = normaliseIndices(x, y, z); |
| 222 | return gMapStyles[gActiveMap].url.replace("{x}", norm.x) |
| 223 | .replace("{y}", norm.y) |
| 224 | .replace("{z}", norm.z); |
| 225 | } |
| 226 | |
| 227 | // Returns true if the tile is outside the current view. |
| 228 | function isOutsideWindow(t) { |
| 229 | var pos = decodeIndex(t); |
| 230 | var x = pos[0]; |
| 231 | var y = pos[1]; |
| 232 | var z = pos[2]; |
| 233 | |
| 234 | var zoomFactor = Math.pow(2, gMaxZoom - z); |
| 235 | var wid = gCanvas.width * zoomFactor; |
| 236 | var ht = gCanvas.height * zoomFactor; |
| 237 | |
| 238 | x *= zoomFactor; |
| 239 | y *= zoomFactor; |
| 240 | |
| 241 | var sz = gTileSize * zoomFactor; |
| 242 | if (x > gPos.x + wid / 2 || y > gPos.y + ht / 2 || |
| 243 | x + sz < gPos.x - wid / 2 || y - sz < gPos.y - ht / 2) |
| 244 | return true; |
| 245 | return false; |
| 246 | } |
| 247 | |
| 248 | function encodeIndex(x, y, z) { |
| 249 | var norm = normaliseIndices(x, y, z); |
| 250 | return norm.x + "," + norm.y + "," + norm.z; |
| 251 | } |
| 252 | |
| 253 | function decodeIndex(encodedIdx) { |
| 254 | return encodedIdx.split(",", 3); |
| 255 | } |
| 256 | |
| 257 | function drawMap() { |
| 258 | // Go through all the currently loaded tiles. If we don't want any of them remove them. |
| 259 | // for (t in gTiles) { |
| 260 | // if (isOutsideWindow(t)) |
| 261 | // delete gTiles[t]; |
| 262 | // } |
| 263 | document.getElementById("zoomLevel").textContent = gPos.z; |
| 264 | gZoomFactor = Math.pow(2, gMaxZoom - gPos.z); |
| 265 | var wid = gCanvas.width * gZoomFactor; // Width in level 18 pixels. |
| 266 | var ht = gCanvas.height * gZoomFactor; // Height in level 18 pixels. |
| 267 | var size = gTileSize * gZoomFactor; // Tile size in level 18 pixels. |
| 268 | |
| 269 | var xMin = gPos.x - wid / 2; // Corners of the window in level 18 pixels. |
| 270 | var yMin = gPos.y - ht / 2; |
| 271 | var xMax = gPos.x + wid / 2; |
| 272 | var yMax = gPos.y + ht / 2; |
| 273 | |
| 274 | if (gMapPrefsLoaded && mainDB) |
| 275 | gPrefs.set("position", gPos); |
| 276 | |
| 277 | // Go through all the tiles we want. |
| 278 | // If any of them aren't loaded or being loaded, do so. |
| 279 | for (var x = Math.floor(xMin / size); x < Math.ceil(xMax / size); x++) { |
| 280 | for (var y = Math.floor(yMin / size); y < Math.ceil(yMax / size); y++) { |
| 281 | var xoff = (x * size - xMin) / gZoomFactor; |
| 282 | var yoff = (y * size - yMin) / gZoomFactor; |
| 283 | var tileKey = encodeIndex(x, y, gPos.z); |
| 284 | if (gTiles[tileKey] && gTiles[tileKey].complete) { |
| 285 | // Round here is **CRUCIAL** otherwise the images are filtered |
| 286 | // and the performance sucks (more than expected). |
| 287 | gContext.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); |
| 288 | } |
| 289 | else { |
| 290 | if (!gTiles[tileKey]) { |
| 291 | gTiles[tileKey] = new Image(); |
| 292 | gTiles[tileKey].src = tileURL(x, y, gPos.z); |
| 293 | gTiles[tileKey].onload = function() { |
| 294 | // TODO: Just render this tile where it should be. |
| 295 | // context.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); // Doesn't work for some reason. |
| 296 | drawMap(); |
| 297 | } |
| 298 | } |
| 299 | gContext.drawImage(gLoadingTile, Math.round(xoff), Math.round(yoff)); |
| 300 | } |
| 301 | } |
| 302 | } |
| 303 | if (gTrack.length) |
| 304 | for (var i = 0; i < gTrack.length; i++) { |
| 305 | drawTrackPoint(gTrack[i].coords.latitude, gTrack[i].coords.longitude); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | function drawTrackPoint(aLatitude, aLongitude) { |
| 310 | var trackpoint = gps2xy(aLatitude, aLongitude); |
| 311 | gContext.strokeStyle = "#FF0000"; |
| 312 | gContext.fillStyle = gContext.strokeStyle; |
| 313 | gContext.lineWidth = 2; |
| 314 | gContext.lineCap = "round"; |
| 315 | gContext.lineJoin = "round"; |
| 316 | gContext.beginPath(); |
| 317 | if (!gLastTrackPoint || gLastTrackPoint == trackpoint) { |
| 318 | gContext.arc((trackpoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, |
| 319 | (trackpoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2, |
| 320 | gContext.lineWidth, 0, Math.PI * 2, false); |
| 321 | gContext.fill(); |
| 322 | } |
| 323 | else { |
| 324 | gContext.moveTo((gLastTrackPoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, |
| 325 | (gLastTrackPoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2); |
| 326 | gContext.lineTo((trackpoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, |
| 327 | (trackpoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2); |
| 328 | gContext.stroke(); |
| 329 | } |
| 330 | gLastTrackPoint = trackpoint; |
| 331 | } |
| 332 | |
| 333 | var mapEvHandler = { |
| 334 | handleEvent: function(aEvent) { |
| 335 | var touchEvent = aEvent.type.indexOf('touch') != -1; |
| 336 | |
| 337 | // Bail out on unwanted map moves, but not zoom-changing events. |
| 338 | if (aEvent.type != "DOMMouseScroll" && aEvent.type != "mousewheel") { |
| 339 | // Bail out if this is neither a touch nor left-click. |
| 340 | if (!touchEvent && aEvent.button != 0) |
| 341 | return; |
| 342 | |
| 343 | // Bail out if the started touch can't be found. |
| 344 | if (touchEvent && zoomstart && |
| 345 | !aEvent.changedTouches.identifiedTouch(gZoomTouchID)) |
| 346 | return; |
| 347 | } |
| 348 | |
| 349 | var coordObj = touchEvent ? |
| 350 | aEvent.changedTouches.identifiedTouch(gZoomTouchID) : |
| 351 | aEvent; |
| 352 | |
| 353 | switch (aEvent.type) { |
| 354 | case "mousedown": |
| 355 | case "touchstart": |
| 356 | if (touchEvent) { |
| 357 | zoomTouchID = aEvent.changedTouches.item(0).identifier; |
| 358 | coordObj = aEvent.changedTouches.identifiedTouch(gZoomTouchID); |
| 359 | } |
| 360 | var x = coordObj.clientX - gCanvas.offsetLeft; |
| 361 | var y = coordObj.clientY - gCanvas.offsetTop; |
| 362 | |
| 363 | if (touchEvent || aEvent.button === 0) { |
| 364 | gDragging = true; |
| 365 | } |
| 366 | gLastMouseX = x; |
| 367 | gLastMouseY = y; |
| 368 | break; |
| 369 | case "mousemove": |
| 370 | case "touchmove": |
| 371 | var x = coordObj.clientX - gCanvas.offsetLeft; |
| 372 | var y = coordObj.clientY - gCanvas.offsetTop; |
| 373 | if (gDragging === true) { |
| 374 | var dX = x - gLastMouseX; |
| 375 | var dY = y - gLastMouseY; |
| 376 | gPos.x -= dX * gZoomFactor; |
| 377 | gPos.y -= dY * gZoomFactor; |
| 378 | drawMap(); |
| 379 | } |
| 380 | gLastMouseX = x; |
| 381 | gLastMouseY = y; |
| 382 | break; |
| 383 | case "mouseup": |
| 384 | case "touchend": |
| 385 | gDragging = false; |
| 386 | break; |
| 387 | case "mouseout": |
| 388 | case "touchcancel": |
| 389 | case "touchleave": |
| 390 | //gDragging = false; |
| 391 | break; |
| 392 | case "DOMMouseScroll": |
| 393 | case "mousewheel": |
| 394 | var delta = 0; |
| 395 | if (aEvent.wheelDelta) { |
| 396 | delta = aEvent.wheelDelta / 120; |
| 397 | if (window.opera) |
| 398 | delta = -delta; |
| 399 | } |
| 400 | else if (aEvent.detail) { |
| 401 | delta = -aEvent.detail / 3; |
| 402 | } |
| 403 | |
| 404 | // Calculate new center of the map - same point stays under the mouse. |
| 405 | // This means that the pixel distance between the old center and point |
| 406 | // must equal the pixel distance of the new center and that point. |
| 407 | var x = coordObj.clientX - gCanvas.offsetLeft; |
| 408 | var y = coordObj.clientY - gCanvas.offsetTop; |
| 409 | // Debug output: "coordinates" of the point the mouse was over. |
| 410 | /* |
| 411 | var ptCoord = {x: gPos.x + (x - gCanvas.width / 2) * gZoomFactor, |
| 412 | y: gPos.y + (x - gCanvas.height / 2) * gZoomFactor}; |
| 413 | var gpsCoord = xy2gps(ptCoord.x, ptCoord.y); |
| 414 | var pt2Coord = gps2xy(gpsCoord.latitude, gpsCoord.longitude); |
| 415 | document.getElementById("debug").textContent = |
| 416 | ptCoord.x + "/" + ptCoord.y + " - " + |
| 417 | gpsCoord.latitude + "/" + gpsCoord.longitude + " - " + |
| 418 | pt2Coord.x + "/" + pt2Coord.y; |
| 419 | */ |
| 420 | // Zoom factor after this action. |
| 421 | var newZoomFactor = Math.pow(2, gMaxZoom - gPos.z + (delta > 0 ? -1 : 1)); |
| 422 | gPos.x -= (x - gCanvas.width / 2) * (newZoomFactor - gZoomFactor); |
| 423 | gPos.y -= (y - gCanvas.height / 2) * (newZoomFactor - gZoomFactor); |
| 424 | |
| 425 | if (delta > 0) |
| 426 | zoomIn(); |
| 427 | else if (delta < 0) |
| 428 | zoomOut(); |
| 429 | break; |
| 430 | } |
| 431 | } |
| 432 | }; |
| 433 | |
| 434 | var geofake = { |
| 435 | tracking: false, |
| 436 | watchPosition: function(aSuccessCallback, aErrorCallback, aPrefObject) { |
| 437 | this.tracking = true; |
| 438 | var watchCall = function() { |
| 439 | aSuccessCallback({timestamp: Date.now(), |
| 440 | coords: {latitude: 48.208174 + |
| 441 | (Math.random() - .5) / 5, |
| 442 | longitude: 16.373819 + |
| 443 | (Math.random() - .5) / 5, |
| 444 | accuracy: 20}}); |
| 445 | if (geofake.tracking) |
| 446 | setTimeout(watchCall, 1000); |
| 447 | }; |
| 448 | setTimeout(watchCall, 1000); |
| 449 | return "foo"; |
| 450 | }, |
| 451 | clearWatch: function(aID) { |
| 452 | this.tracking = false; |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | function setCentering(aCheckbox) { |
| 457 | if (gMapPrefsLoaded && mainDB) |
| 458 | gPrefs.set("center_map", aCheckbox.checked); |
| 459 | gCenterPosition = aCheckbox.checked; |
| 460 | } |
| 461 | |
| 462 | function setTracking(aCheckbox) { |
| 463 | if (gMapPrefsLoaded && mainDB) |
| 464 | gPrefs.set("tracking_enabled", aCheckbox.checked); |
| 465 | if (aCheckbox.checked) |
| 466 | startTracking(); |
| 467 | else |
| 468 | endTracking(); |
| 469 | } |
| 470 | |
| 471 | function startTracking() { |
| 472 | var loopCnt = 0; |
| 473 | var getStoredTrack = function() { |
| 474 | if (mainDB) |
| 475 | gTrackStore.getList(function(aTPoints) { |
| 476 | //document.getElementById("debug").textContent = aTPoints.length + " points loaded."; |
| 477 | if (aTPoints.length) { |
| 478 | gTrack = aTPoints; |
| 479 | } |
| 480 | }); |
| 481 | else |
| 482 | setTimeout(getStoredTrack, 100); |
| 483 | loopCnt++; |
| 484 | if (loopCnt > 20) |
| 485 | return; |
| 486 | }; |
| 487 | getStoredTrack(); |
| 488 | if (navigator.geolocation) { |
| 489 | //gGeoWatchID = geofake.watchPosition( |
| 490 | gGeoWatchID = navigator.geolocation.watchPosition( |
| 491 | function(position) { |
| 492 | // Coords spec: https://developer.mozilla.org/en/XPCOM_Interface_Reference/NsIDOMGeoPositionCoords |
| 493 | var tPoint = {time: position.timestamp, |
| 494 | coords: position.coords, |
| 495 | beginSegment: !gLastTrackPoint}; |
| 496 | gTrack.push(tPoint); |
| 497 | gTrackStore.push(tPoint); |
| 498 | drawTrackPoint(position.coords.latitude, position.coords.longitude); |
| 499 | if (gCenterPosition) { |
| 500 | var posCoord = gps2xy(position.coords.latitude, |
| 501 | position.coords.longitude); |
| 502 | if (Math.abs(gPos.x - posCoord.x) > gCanvas.width * gZoomFactor / 4 || |
| 503 | Math.abs(gPos.y - posCoord.y) > gCanvas.height * gZoomFactor / 4) { |
| 504 | gPos.x = posCoord.x; |
| 505 | gPos.y = posCoord.y; |
| 506 | drawMap(); |
| 507 | } |
| 508 | } |
| 509 | }, |
| 510 | function(error) { |
| 511 | // Ignore erros for the moment, but this is good for debugging. |
| 512 | // See https://developer.mozilla.org/en/Using_geolocation#Handling_errors |
| 513 | document.getElementById("debug").textContent = error.message; |
| 514 | }, |
| 515 | {enableHighAccuracy: true} |
| 516 | ); |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | function endTracking() { |
| 521 | if (gGeoWatchID) { |
| 522 | //geofake.clearWatch(gGeoWatchID); |
| 523 | navigator.geolocation.clearWatch(gGeoWatchID); |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | function clearTrack() { |
| 528 | gTrack = []; |
| 529 | gTrackStore.clear(); |
| 530 | drawMap(); |
| 531 | } |