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a7393a71 RK |
1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
2 | * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
3 | * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
23cd2dcc | 4 | |
4b12da3a RK |
5 | var gCanvas, gContext, gGeolocation; |
6 | var gDebug = false; | |
23cd2dcc RK |
7 | |
8 | var gTileSize = 256; | |
9 | var gMaxZoom = 18; // The minimum is 0. | |
10 | ||
b47b4a65 RK |
11 | var gMapStyles = { |
12 | // OSM tile usage policy: http://wiki.openstreetmap.org/wiki/Tile_usage_policy | |
55c4a0b7 | 13 | // Find some more OSM ones at http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#Tile_servers |
b47b4a65 RK |
14 | osm_mapnik: |
15 | {name: "OpenStreetMap (Mapnik)", | |
16 | url: "http://tile.openstreetmap.org/{z}/{x}/{y}.png", | |
17 | 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>'}, | |
18 | osm_tilesathome: | |
19 | {name: "OpenStreetMap (OSMarender)", | |
20 | url: "http://tah.openstreetmap.org/Tiles/tile/{z}/{x}/{y}.png", | |
21 | 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>'}, | |
22 | mapquest_open: | |
55c4a0b7 | 23 | {name: "MapQuest OSM", |
b47b4a65 | 24 | url: "http://otile1.mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.png", |
55c4a0b7 RK |
25 | 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>.'}, |
26 | mapquest_aerial: | |
27 | {name: "MapQuest Open Aerial", | |
28 | url: "http://oatile1.mqcdn.com/naip/{z}/{x}/{y}.png", | |
29 | 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>.'}, | |
30 | google_map: | |
31 | {name: "Google Maps", | |
32 | url: " http://mt1.google.com/vt/x={x}&y={y}&z={z}", | |
33 | copyright: 'Map data and imagery © <a href="http://maps.google.com/">Google</a>'}, | |
b47b4a65 RK |
34 | }; |
35 | var gActiveMap = "osm_mapnik"; | |
23cd2dcc RK |
36 | |
37 | var gPos = {x: 35630000.0, // Current position in the map in pixels at the maximum zoom level (18) | |
38 | y: 23670000.0, // The range is 0-67108864 (2^gMaxZoom * gTileSize) | |
b395419b | 39 | z: 5}; // This could be fractional if supported being between zoom levels. |
23cd2dcc RK |
40 | |
41 | var gLastMouseX = 0; | |
42 | var gLastMouseY = 0; | |
b395419b | 43 | var gZoomFactor; |
23cd2dcc | 44 | |
3610c22d RK |
45 | // Used as an associative array. |
46 | // The keys have to be strings, ours will be "xindex,yindex,zindex" e.g. "13,245,12". | |
23cd2dcc | 47 | var gTiles = {}; |
b395419b | 48 | var gLoadingTile; |
23cd2dcc | 49 | |
3610c22d RK |
50 | var gMapPrefsLoaded = false; |
51 | ||
23cd2dcc | 52 | var gDragging = false; |
4b12da3a | 53 | var gDragTouchID; |
23cd2dcc | 54 | |
55c4a0b7 RK |
55 | var gGeoWatchID; |
56 | var gTrack = []; | |
57 | var gLastTrackPoint; | |
05c21757 | 58 | var gCenterPosition = true; |
55c4a0b7 | 59 | |
b47b4a65 | 60 | function initMap() { |
4b12da3a | 61 | gGeolocation = navigator.geolocation; |
23cd2dcc RK |
62 | gCanvas = document.getElementById("map"); |
63 | gContext = gCanvas.getContext("2d"); | |
b47b4a65 RK |
64 | if (!gActiveMap) |
65 | gActiveMap = "osm_mapnik"; | |
23cd2dcc | 66 | |
4b12da3a RK |
67 | //gDebug = true; |
68 | if (gDebug) { | |
69 | gGeolocation = geofake; | |
70 | var hiddenList = document.getElementsByClassName("debugHide"); | |
71 | // last to first - list of elements with that class is changing! | |
72 | for (var i = hiddenList.length - 1; i >= 0; i--) { | |
73 | hiddenList[i].classList.remove("debugHide"); | |
74 | } | |
75 | } | |
76 | ||
3610c22d RK |
77 | var loopCnt = 0; |
78 | var getPersistentPrefs = function() { | |
79 | if (mainDB) { | |
80 | gPrefs.get("position", function(aValue) { | |
81 | if (aValue) { | |
82 | gPos = aValue; | |
83 | drawMap(); | |
84 | } | |
85 | }); | |
86 | gPrefs.get("center_map", function(aValue) { | |
87 | if (aValue === undefined) | |
88 | document.getElementById("centerCheckbox").checked = true; | |
89 | else | |
90 | document.getElementById("centerCheckbox").checked = aValue; | |
91 | setCentering(document.getElementById("centerCheckbox")); | |
92 | }); | |
93 | gPrefs.get("tracking_enabled", function(aValue) { | |
94 | if (aValue === undefined) | |
95 | document.getElementById("trackCheckbox").checked = true; | |
96 | else | |
97 | document.getElementById("trackCheckbox").checked = aValue; | |
98 | setTracking(document.getElementById("trackCheckbox")); | |
99 | }); | |
100 | gMapPrefsLoaded = true; | |
101 | } | |
102 | else | |
103 | setTimeout(getPersistentPrefs, 100); | |
104 | loopCnt++; | |
105 | if (loopCnt > 20) { | |
106 | gMapPrefsLoaded = true; | |
107 | return; | |
108 | } | |
109 | }; | |
110 | getPersistentPrefs(); | |
111 | ||
23cd2dcc RK |
112 | gCanvas.addEventListener("mouseup", mapEvHandler, false); |
113 | gCanvas.addEventListener("mousemove", mapEvHandler, false); | |
114 | gCanvas.addEventListener("mousedown", mapEvHandler, false); | |
115 | gCanvas.addEventListener("mouseout", mapEvHandler, false); | |
116 | ||
117 | gCanvas.addEventListener("touchstart", mapEvHandler, false); | |
118 | gCanvas.addEventListener("touchmove", mapEvHandler, false); | |
119 | gCanvas.addEventListener("touchend", mapEvHandler, false); | |
120 | gCanvas.addEventListener("touchcancel", mapEvHandler, false); | |
121 | gCanvas.addEventListener("touchleave", mapEvHandler, false); | |
122 | ||
123 | gCanvas.addEventListener("DOMMouseScroll", mapEvHandler, false); | |
124 | gCanvas.addEventListener("mousewheel", mapEvHandler, false); | |
125 | ||
b47b4a65 RK |
126 | document.getElementById("copyright").innerHTML = |
127 | gMapStyles[gActiveMap].copyright; | |
b395419b RK |
128 | |
129 | gLoadingTile = new Image(); | |
130 | gLoadingTile.src = "style/loading.png"; | |
23cd2dcc RK |
131 | } |
132 | ||
133 | function resizeAndDraw() { | |
134 | var viewportWidth = window.innerWidth; | |
135 | var viewportHeight = window.innerHeight; | |
136 | ||
137 | var canvasWidth = viewportWidth * 0.98; | |
b47b4a65 | 138 | var canvasHeight = (viewportHeight - 100) * 0.98; |
23cd2dcc RK |
139 | gCanvas.style.position = "fixed"; |
140 | gCanvas.width = canvasWidth; | |
141 | gCanvas.height = canvasHeight; | |
142 | drawMap(); | |
143 | } | |
144 | ||
145 | function zoomIn() { | |
146 | if (gPos.z < gMaxZoom) { | |
147 | gPos.z++; | |
148 | drawMap(); | |
149 | } | |
150 | } | |
151 | ||
152 | function zoomOut() { | |
153 | if (gPos.z > 0) { | |
154 | gPos.z--; | |
155 | drawMap(); | |
156 | } | |
157 | } | |
158 | ||
55c4a0b7 RK |
159 | function gps2xy(aLatitude, aLongitude) { |
160 | var maxZoomFactor = Math.pow(2, gMaxZoom) * gTileSize; | |
161 | var convLat = aLatitude * Math.PI / 180; | |
162 | var rawY = (1 - Math.log(Math.tan(convLat) + | |
163 | 1 / Math.cos(convLat)) / Math.PI) / 2 * maxZoomFactor; | |
164 | var rawX = (aLongitude + 180) / 360 * maxZoomFactor; | |
165 | return {x: Math.round(rawX), | |
166 | y: Math.round(rawY)}; | |
167 | } | |
168 | ||
169 | function xy2gps(aX, aY) { | |
170 | var maxZoomFactor = Math.pow(2, gMaxZoom) * gTileSize; | |
171 | var n = Math.PI - 2 * Math.PI * aY / maxZoomFactor; | |
172 | return {latitude: 180 / Math.PI * | |
173 | Math.atan(0.5 * (Math.exp(n) - Math.exp(-n))), | |
174 | longitude: aX / maxZoomFactor * 360 - 180}; | |
175 | } | |
176 | ||
b47b4a65 RK |
177 | function setMapStyle() { |
178 | var mapSel = document.getElementById("mapSelector"); | |
179 | if (mapSel.selectedIndex >= 0 && gActiveMap != mapSel.value) { | |
180 | gActiveMap = mapSel.value; | |
181 | gTiles = {}; | |
182 | drawMap(); | |
183 | } | |
184 | } | |
185 | ||
23cd2dcc RK |
186 | // A sane mod function that works for negative numbers. |
187 | // Returns a % b. | |
188 | function mod(a, b) { | |
189 | return ((a % b) + b) % b; | |
190 | } | |
191 | ||
192 | function normaliseIndices(x, y, z) { | |
b395419b RK |
193 | var zoomFactor = Math.pow(2, z); |
194 | return {x: mod(x, zoomFactor), | |
195 | y: mod(y, zoomFactor), | |
23cd2dcc RK |
196 | z: z}; |
197 | } | |
198 | ||
199 | function tileURL(x, y, z) { | |
200 | var norm = normaliseIndices(x, y, z); | |
b47b4a65 RK |
201 | return gMapStyles[gActiveMap].url.replace("{x}", norm.x) |
202 | .replace("{y}", norm.y) | |
203 | .replace("{z}", norm.z); | |
23cd2dcc RK |
204 | } |
205 | ||
206 | // Returns true if the tile is outside the current view. | |
207 | function isOutsideWindow(t) { | |
208 | var pos = decodeIndex(t); | |
209 | var x = pos[0]; | |
210 | var y = pos[1]; | |
211 | var z = pos[2]; | |
212 | ||
b395419b RK |
213 | var zoomFactor = Math.pow(2, gMaxZoom - z); |
214 | var wid = gCanvas.width * zoomFactor; | |
215 | var ht = gCanvas.height * zoomFactor; | |
23cd2dcc | 216 | |
b395419b RK |
217 | x *= zoomFactor; |
218 | y *= zoomFactor; | |
23cd2dcc | 219 | |
b395419b | 220 | var sz = gTileSize * zoomFactor; |
23cd2dcc RK |
221 | if (x > gPos.x + wid / 2 || y > gPos.y + ht / 2 || |
222 | x + sz < gPos.x - wid / 2 || y - sz < gPos.y - ht / 2) | |
223 | return true; | |
224 | return false; | |
225 | } | |
226 | ||
227 | function encodeIndex(x, y, z) { | |
228 | var norm = normaliseIndices(x, y, z); | |
229 | return norm.x + "," + norm.y + "," + norm.z; | |
230 | } | |
231 | ||
232 | function decodeIndex(encodedIdx) { | |
233 | return encodedIdx.split(",", 3); | |
234 | } | |
235 | ||
236 | function drawMap() { | |
237 | // Go through all the currently loaded tiles. If we don't want any of them remove them. | |
238 | // for (t in gTiles) { | |
239 | // if (isOutsideWindow(t)) | |
240 | // delete gTiles[t]; | |
241 | // } | |
b395419b RK |
242 | document.getElementById("zoomLevel").textContent = gPos.z; |
243 | gZoomFactor = Math.pow(2, gMaxZoom - gPos.z); | |
244 | var wid = gCanvas.width * gZoomFactor; // Width in level 18 pixels. | |
245 | var ht = gCanvas.height * gZoomFactor; // Height in level 18 pixels. | |
246 | var size = gTileSize * gZoomFactor; // Tile size in level 18 pixels. | |
23cd2dcc RK |
247 | |
248 | var xMin = gPos.x - wid / 2; // Corners of the window in level 18 pixels. | |
249 | var yMin = gPos.y - ht / 2; | |
250 | var xMax = gPos.x + wid / 2; | |
251 | var yMax = gPos.y + ht / 2; | |
252 | ||
3610c22d RK |
253 | if (gMapPrefsLoaded && mainDB) |
254 | gPrefs.set("position", gPos); | |
255 | ||
256 | // Go through all the tiles we want. | |
257 | // If any of them aren't loaded or being loaded, do so. | |
b47b4a65 RK |
258 | for (var x = Math.floor(xMin / size); x < Math.ceil(xMax / size); x++) { |
259 | for (var y = Math.floor(yMin / size); y < Math.ceil(yMax / size); y++) { | |
b395419b RK |
260 | var xoff = (x * size - xMin) / gZoomFactor; |
261 | var yoff = (y * size - yMin) / gZoomFactor; | |
262 | var tileKey = encodeIndex(x, y, gPos.z); | |
23cd2dcc | 263 | if (gTiles[tileKey] && gTiles[tileKey].complete) { |
3610c22d RK |
264 | // Round here is **CRUCIAL** otherwise the images are filtered |
265 | // and the performance sucks (more than expected). | |
23cd2dcc RK |
266 | gContext.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); |
267 | } | |
268 | else { | |
269 | if (!gTiles[tileKey]) { | |
270 | gTiles[tileKey] = new Image(); | |
271 | gTiles[tileKey].src = tileURL(x, y, gPos.z); | |
272 | gTiles[tileKey].onload = function() { | |
273 | // TODO: Just render this tile where it should be. | |
274 | // context.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); // Doesn't work for some reason. | |
275 | drawMap(); | |
276 | } | |
277 | } | |
b395419b | 278 | gContext.drawImage(gLoadingTile, Math.round(xoff), Math.round(yoff)); |
23cd2dcc RK |
279 | } |
280 | } | |
281 | } | |
55c4a0b7 RK |
282 | if (gTrack.length) |
283 | for (var i = 0; i < gTrack.length; i++) { | |
284 | drawTrackPoint(gTrack[i].coords.latitude, gTrack[i].coords.longitude); | |
285 | } | |
286 | } | |
287 | ||
288 | function drawTrackPoint(aLatitude, aLongitude) { | |
289 | var trackpoint = gps2xy(aLatitude, aLongitude); | |
290 | gContext.strokeStyle = "#FF0000"; | |
291 | gContext.fillStyle = gContext.strokeStyle; | |
292 | gContext.lineWidth = 2; | |
293 | gContext.lineCap = "round"; | |
294 | gContext.lineJoin = "round"; | |
295 | gContext.beginPath(); | |
296 | if (!gLastTrackPoint || gLastTrackPoint == trackpoint) { | |
297 | gContext.arc((trackpoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, | |
298 | (trackpoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2, | |
299 | gContext.lineWidth, 0, Math.PI * 2, false); | |
300 | gContext.fill(); | |
301 | } | |
302 | else { | |
303 | gContext.moveTo((gLastTrackPoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, | |
304 | (gLastTrackPoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2); | |
305 | gContext.lineTo((trackpoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, | |
306 | (trackpoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2); | |
307 | gContext.stroke(); | |
308 | } | |
309 | gLastTrackPoint = trackpoint; | |
23cd2dcc RK |
310 | } |
311 | ||
312 | var mapEvHandler = { | |
313 | handleEvent: function(aEvent) { | |
314 | var touchEvent = aEvent.type.indexOf('touch') != -1; | |
315 | ||
b395419b | 316 | // Bail out on unwanted map moves, but not zoom-changing events. |
23cd2dcc RK |
317 | if (aEvent.type != "DOMMouseScroll" && aEvent.type != "mousewheel") { |
318 | // Bail out if this is neither a touch nor left-click. | |
319 | if (!touchEvent && aEvent.button != 0) | |
320 | return; | |
321 | ||
322 | // Bail out if the started touch can't be found. | |
4b12da3a RK |
323 | if (touchEvent && gDragging && |
324 | !aEvent.changedTouches.identifiedTouch(gDragTouchID)) | |
23cd2dcc RK |
325 | return; |
326 | } | |
327 | ||
328 | var coordObj = touchEvent ? | |
4b12da3a | 329 | aEvent.changedTouches.identifiedTouch(gDragTouchID) : |
23cd2dcc RK |
330 | aEvent; |
331 | ||
332 | switch (aEvent.type) { | |
333 | case "mousedown": | |
334 | case "touchstart": | |
335 | if (touchEvent) { | |
4b12da3a RK |
336 | gDragTouchID = aEvent.changedTouches.item(0).identifier; |
337 | coordObj = aEvent.changedTouches.identifiedTouch(gDragTouchID); | |
23cd2dcc RK |
338 | } |
339 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
340 | var y = coordObj.clientY - gCanvas.offsetTop; | |
b395419b | 341 | |
23cd2dcc RK |
342 | if (touchEvent || aEvent.button === 0) { |
343 | gDragging = true; | |
344 | } | |
345 | gLastMouseX = x; | |
346 | gLastMouseY = y; | |
347 | break; | |
348 | case "mousemove": | |
349 | case "touchmove": | |
350 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
351 | var y = coordObj.clientY - gCanvas.offsetTop; | |
352 | if (gDragging === true) { | |
353 | var dX = x - gLastMouseX; | |
354 | var dY = y - gLastMouseY; | |
b395419b RK |
355 | gPos.x -= dX * gZoomFactor; |
356 | gPos.y -= dY * gZoomFactor; | |
23cd2dcc RK |
357 | drawMap(); |
358 | } | |
359 | gLastMouseX = x; | |
360 | gLastMouseY = y; | |
361 | break; | |
362 | case "mouseup": | |
363 | case "touchend": | |
364 | gDragging = false; | |
365 | break; | |
366 | case "mouseout": | |
367 | case "touchcancel": | |
368 | case "touchleave": | |
369 | //gDragging = false; | |
370 | break; | |
371 | case "DOMMouseScroll": | |
372 | case "mousewheel": | |
373 | var delta = 0; | |
374 | if (aEvent.wheelDelta) { | |
375 | delta = aEvent.wheelDelta / 120; | |
376 | if (window.opera) | |
377 | delta = -delta; | |
378 | } | |
379 | else if (aEvent.detail) { | |
380 | delta = -aEvent.detail / 3; | |
381 | } | |
382 | ||
b395419b RK |
383 | // Calculate new center of the map - same point stays under the mouse. |
384 | // This means that the pixel distance between the old center and point | |
385 | // must equal the pixel distance of the new center and that point. | |
386 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
387 | var y = coordObj.clientY - gCanvas.offsetTop; | |
55c4a0b7 RK |
388 | // Debug output: "coordinates" of the point the mouse was over. |
389 | /* | |
390 | var ptCoord = {x: gPos.x + (x - gCanvas.width / 2) * gZoomFactor, | |
391 | y: gPos.y + (x - gCanvas.height / 2) * gZoomFactor}; | |
392 | var gpsCoord = xy2gps(ptCoord.x, ptCoord.y); | |
393 | var pt2Coord = gps2xy(gpsCoord.latitude, gpsCoord.longitude); | |
394 | document.getElementById("debug").textContent = | |
395 | ptCoord.x + "/" + ptCoord.y + " - " + | |
396 | gpsCoord.latitude + "/" + gpsCoord.longitude + " - " + | |
397 | pt2Coord.x + "/" + pt2Coord.y; | |
398 | */ | |
b395419b RK |
399 | // Zoom factor after this action. |
400 | var newZoomFactor = Math.pow(2, gMaxZoom - gPos.z + (delta > 0 ? -1 : 1)); | |
401 | gPos.x -= (x - gCanvas.width / 2) * (newZoomFactor - gZoomFactor); | |
402 | gPos.y -= (y - gCanvas.height / 2) * (newZoomFactor - gZoomFactor); | |
b395419b | 403 | |
23cd2dcc RK |
404 | if (delta > 0) |
405 | zoomIn(); | |
406 | else if (delta < 0) | |
407 | zoomOut(); | |
408 | break; | |
409 | } | |
410 | } | |
411 | }; | |
55c4a0b7 | 412 | |
993fd081 | 413 | var geofake = { |
55c4a0b7 | 414 | tracking: false, |
4b12da3a | 415 | lastPos: {x: undefined, y: undefined}, |
55c4a0b7 RK |
416 | watchPosition: function(aSuccessCallback, aErrorCallback, aPrefObject) { |
417 | this.tracking = true; | |
418 | var watchCall = function() { | |
4b12da3a RK |
419 | // calc new position in lat/lon degrees |
420 | // 90° on Earth surface are ~10,000 km at the equator, | |
421 | // so try moving at most 10m at a time | |
422 | if (geofake.lastPos.x) | |
423 | geofake.lastPos.x += (Math.random() - .5) * 90 / 1000000 | |
424 | else | |
425 | geofake.lastPos.x = 48.208174 | |
426 | if (geofake.lastPos.y) | |
427 | geofake.lastPos.y += (Math.random() - .5) * 90 / 1000000 | |
428 | else | |
429 | geofake.lastPos.y = 16.373819 | |
55c4a0b7 | 430 | aSuccessCallback({timestamp: Date.now(), |
4b12da3a RK |
431 | coords: {latitude: geofake.lastPos.x, |
432 | longitude: geofake.lastPos.y, | |
55c4a0b7 RK |
433 | accuracy: 20}}); |
434 | if (geofake.tracking) | |
435 | setTimeout(watchCall, 1000); | |
436 | }; | |
437 | setTimeout(watchCall, 1000); | |
438 | return "foo"; | |
439 | }, | |
440 | clearWatch: function(aID) { | |
441 | this.tracking = false; | |
442 | } | |
443 | } | |
444 | ||
3610c22d RK |
445 | function setCentering(aCheckbox) { |
446 | if (gMapPrefsLoaded && mainDB) | |
447 | gPrefs.set("center_map", aCheckbox.checked); | |
448 | gCenterPosition = aCheckbox.checked; | |
449 | } | |
450 | ||
451 | function setTracking(aCheckbox) { | |
452 | if (gMapPrefsLoaded && mainDB) | |
453 | gPrefs.set("tracking_enabled", aCheckbox.checked); | |
454 | if (aCheckbox.checked) | |
455 | startTracking(); | |
456 | else | |
457 | endTracking(); | |
458 | } | |
459 | ||
55c4a0b7 | 460 | function startTracking() { |
993fd081 RK |
461 | var loopCnt = 0; |
462 | var getStoredTrack = function() { | |
463 | if (mainDB) | |
464 | gTrackStore.getList(function(aTPoints) { | |
4b12da3a RK |
465 | if (gDebug) |
466 | document.getElementById("debug").textContent = aTPoints.length + " points loaded."; | |
993fd081 RK |
467 | if (aTPoints.length) { |
468 | gTrack = aTPoints; | |
469 | } | |
470 | }); | |
471 | else | |
472 | setTimeout(getStoredTrack, 100); | |
473 | loopCnt++; | |
474 | if (loopCnt > 20) | |
475 | return; | |
476 | }; | |
477 | getStoredTrack(); | |
55c4a0b7 | 478 | if (navigator.geolocation) { |
4b12da3a | 479 | gGeoWatchID = gGeolocation.watchPosition( |
55c4a0b7 RK |
480 | function(position) { |
481 | // Coords spec: https://developer.mozilla.org/en/XPCOM_Interface_Reference/NsIDOMGeoPositionCoords | |
993fd081 RK |
482 | var tPoint = {time: position.timestamp, |
483 | coords: position.coords, | |
484 | beginSegment: !gLastTrackPoint}; | |
485 | gTrack.push(tPoint); | |
486 | gTrackStore.push(tPoint); | |
55c4a0b7 | 487 | drawTrackPoint(position.coords.latitude, position.coords.longitude); |
05c21757 | 488 | if (gCenterPosition) { |
3610c22d RK |
489 | var posCoord = gps2xy(position.coords.latitude, |
490 | position.coords.longitude); | |
99631a75 RK |
491 | if (Math.abs(gPos.x - posCoord.x) > gCanvas.width * gZoomFactor / 4 || |
492 | Math.abs(gPos.y - posCoord.y) > gCanvas.height * gZoomFactor / 4) { | |
493 | gPos.x = posCoord.x; | |
494 | gPos.y = posCoord.y; | |
495 | drawMap(); | |
496 | } | |
05c21757 | 497 | } |
55c4a0b7 RK |
498 | }, |
499 | function(error) { | |
500 | // Ignore erros for the moment, but this is good for debugging. | |
501 | // See https://developer.mozilla.org/en/Using_geolocation#Handling_errors | |
502 | document.getElementById("debug").textContent = error.message; | |
503 | }, | |
504 | {enableHighAccuracy: true} | |
505 | ); | |
506 | } | |
507 | } | |
508 | ||
509 | function endTracking() { | |
510 | if (gGeoWatchID) { | |
4b12da3a | 511 | gGeolocation.clearWatch(gGeoWatchID); |
55c4a0b7 RK |
512 | } |
513 | } | |
993fd081 RK |
514 | |
515 | function clearTrack() { | |
516 | gTrack = []; | |
517 | gTrackStore.clear(); | |
518 | drawMap(); | |
519 | } |