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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 RK |
4 | |
5 | var gCanvas, gContext; | |
6 | ||
7 | var gTileSize = 256; | |
8 | var gMaxZoom = 18; // The minimum is 0. | |
9 | ||
b47b4a65 RK |
10 | var gMapStyles = { |
11 | // OSM tile usage policy: http://wiki.openstreetmap.org/wiki/Tile_usage_policy | |
55c4a0b7 | 12 | // Find some more OSM ones at http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#Tile_servers |
b47b4a65 RK |
13 | osm_mapnik: |
14 | {name: "OpenStreetMap (Mapnik)", | |
15 | url: "http://tile.openstreetmap.org/{z}/{x}/{y}.png", | |
16 | 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>'}, | |
17 | osm_tilesathome: | |
18 | {name: "OpenStreetMap (OSMarender)", | |
19 | url: "http://tah.openstreetmap.org/Tiles/tile/{z}/{x}/{y}.png", | |
20 | 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>'}, | |
21 | mapquest_open: | |
55c4a0b7 | 22 | {name: "MapQuest OSM", |
b47b4a65 | 23 | url: "http://otile1.mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.png", |
55c4a0b7 RK |
24 | 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>.'}, |
25 | mapquest_aerial: | |
26 | {name: "MapQuest Open Aerial", | |
27 | url: "http://oatile1.mqcdn.com/naip/{z}/{x}/{y}.png", | |
28 | 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>.'}, | |
29 | google_map: | |
30 | {name: "Google Maps", | |
31 | url: " http://mt1.google.com/vt/x={x}&y={y}&z={z}", | |
32 | copyright: 'Map data and imagery © <a href="http://maps.google.com/">Google</a>'}, | |
b47b4a65 RK |
33 | }; |
34 | var gActiveMap = "osm_mapnik"; | |
23cd2dcc RK |
35 | |
36 | var gPos = {x: 35630000.0, // Current position in the map in pixels at the maximum zoom level (18) | |
37 | y: 23670000.0, // The range is 0-67108864 (2^gMaxZoom * gTileSize) | |
b395419b | 38 | z: 5}; // This could be fractional if supported being between zoom levels. |
23cd2dcc RK |
39 | |
40 | var gLastMouseX = 0; | |
41 | var gLastMouseY = 0; | |
b395419b | 42 | var gZoomFactor; |
23cd2dcc | 43 | |
3610c22d RK |
44 | // Used as an associative array. |
45 | // The keys have to be strings, ours will be "xindex,yindex,zindex" e.g. "13,245,12". | |
23cd2dcc | 46 | var gTiles = {}; |
b395419b | 47 | var gLoadingTile; |
23cd2dcc | 48 | |
3610c22d RK |
49 | var gMapPrefsLoaded = false; |
50 | ||
23cd2dcc RK |
51 | var gDragging = false; |
52 | var gZoomTouchID; | |
53 | ||
55c4a0b7 RK |
54 | var gGeoWatchID; |
55 | var gTrack = []; | |
56 | var gLastTrackPoint; | |
05c21757 | 57 | var gCenterPosition = true; |
55c4a0b7 | 58 | |
b47b4a65 | 59 | function initMap() { |
23cd2dcc RK |
60 | gCanvas = document.getElementById("map"); |
61 | gContext = gCanvas.getContext("2d"); | |
b47b4a65 RK |
62 | if (!gActiveMap) |
63 | gActiveMap = "osm_mapnik"; | |
23cd2dcc | 64 | |
3610c22d RK |
65 | var loopCnt = 0; |
66 | var getPersistentPrefs = function() { | |
67 | if (mainDB) { | |
68 | gPrefs.get("position", function(aValue) { | |
69 | if (aValue) { | |
70 | gPos = aValue; | |
71 | drawMap(); | |
72 | } | |
73 | }); | |
74 | gPrefs.get("center_map", function(aValue) { | |
75 | if (aValue === undefined) | |
76 | document.getElementById("centerCheckbox").checked = true; | |
77 | else | |
78 | document.getElementById("centerCheckbox").checked = aValue; | |
79 | setCentering(document.getElementById("centerCheckbox")); | |
80 | }); | |
81 | gPrefs.get("tracking_enabled", function(aValue) { | |
82 | if (aValue === undefined) | |
83 | document.getElementById("trackCheckbox").checked = true; | |
84 | else | |
85 | document.getElementById("trackCheckbox").checked = aValue; | |
86 | setTracking(document.getElementById("trackCheckbox")); | |
87 | }); | |
88 | gMapPrefsLoaded = true; | |
89 | } | |
90 | else | |
91 | setTimeout(getPersistentPrefs, 100); | |
92 | loopCnt++; | |
93 | if (loopCnt > 20) { | |
94 | gMapPrefsLoaded = true; | |
95 | return; | |
96 | } | |
97 | }; | |
98 | getPersistentPrefs(); | |
99 | ||
23cd2dcc RK |
100 | gCanvas.addEventListener("mouseup", mapEvHandler, false); |
101 | gCanvas.addEventListener("mousemove", mapEvHandler, false); | |
102 | gCanvas.addEventListener("mousedown", mapEvHandler, false); | |
103 | gCanvas.addEventListener("mouseout", mapEvHandler, false); | |
104 | ||
105 | gCanvas.addEventListener("touchstart", mapEvHandler, false); | |
106 | gCanvas.addEventListener("touchmove", mapEvHandler, false); | |
107 | gCanvas.addEventListener("touchend", mapEvHandler, false); | |
108 | gCanvas.addEventListener("touchcancel", mapEvHandler, false); | |
109 | gCanvas.addEventListener("touchleave", mapEvHandler, false); | |
110 | ||
111 | gCanvas.addEventListener("DOMMouseScroll", mapEvHandler, false); | |
112 | gCanvas.addEventListener("mousewheel", mapEvHandler, false); | |
113 | ||
b47b4a65 RK |
114 | document.getElementById("copyright").innerHTML = |
115 | gMapStyles[gActiveMap].copyright; | |
b395419b RK |
116 | |
117 | gLoadingTile = new Image(); | |
118 | gLoadingTile.src = "style/loading.png"; | |
23cd2dcc RK |
119 | } |
120 | ||
121 | function resizeAndDraw() { | |
122 | var viewportWidth = window.innerWidth; | |
123 | var viewportHeight = window.innerHeight; | |
124 | ||
125 | var canvasWidth = viewportWidth * 0.98; | |
b47b4a65 | 126 | var canvasHeight = (viewportHeight - 100) * 0.98; |
23cd2dcc RK |
127 | gCanvas.style.position = "fixed"; |
128 | gCanvas.width = canvasWidth; | |
129 | gCanvas.height = canvasHeight; | |
130 | drawMap(); | |
131 | } | |
132 | ||
133 | function zoomIn() { | |
134 | if (gPos.z < gMaxZoom) { | |
135 | gPos.z++; | |
136 | drawMap(); | |
137 | } | |
138 | } | |
139 | ||
140 | function zoomOut() { | |
141 | if (gPos.z > 0) { | |
142 | gPos.z--; | |
143 | drawMap(); | |
144 | } | |
145 | } | |
146 | ||
55c4a0b7 RK |
147 | function gps2xy(aLatitude, aLongitude) { |
148 | var maxZoomFactor = Math.pow(2, gMaxZoom) * gTileSize; | |
149 | var convLat = aLatitude * Math.PI / 180; | |
150 | var rawY = (1 - Math.log(Math.tan(convLat) + | |
151 | 1 / Math.cos(convLat)) / Math.PI) / 2 * maxZoomFactor; | |
152 | var rawX = (aLongitude + 180) / 360 * maxZoomFactor; | |
153 | return {x: Math.round(rawX), | |
154 | y: Math.round(rawY)}; | |
155 | } | |
156 | ||
157 | function xy2gps(aX, aY) { | |
158 | var maxZoomFactor = Math.pow(2, gMaxZoom) * gTileSize; | |
159 | var n = Math.PI - 2 * Math.PI * aY / maxZoomFactor; | |
160 | return {latitude: 180 / Math.PI * | |
161 | Math.atan(0.5 * (Math.exp(n) - Math.exp(-n))), | |
162 | longitude: aX / maxZoomFactor * 360 - 180}; | |
163 | } | |
164 | ||
b47b4a65 RK |
165 | function setMapStyle() { |
166 | var mapSel = document.getElementById("mapSelector"); | |
167 | if (mapSel.selectedIndex >= 0 && gActiveMap != mapSel.value) { | |
168 | gActiveMap = mapSel.value; | |
169 | gTiles = {}; | |
170 | drawMap(); | |
171 | } | |
172 | } | |
173 | ||
23cd2dcc RK |
174 | // A sane mod function that works for negative numbers. |
175 | // Returns a % b. | |
176 | function mod(a, b) { | |
177 | return ((a % b) + b) % b; | |
178 | } | |
179 | ||
180 | function normaliseIndices(x, y, z) { | |
b395419b RK |
181 | var zoomFactor = Math.pow(2, z); |
182 | return {x: mod(x, zoomFactor), | |
183 | y: mod(y, zoomFactor), | |
23cd2dcc RK |
184 | z: z}; |
185 | } | |
186 | ||
187 | function tileURL(x, y, z) { | |
188 | var norm = normaliseIndices(x, y, z); | |
b47b4a65 RK |
189 | return gMapStyles[gActiveMap].url.replace("{x}", norm.x) |
190 | .replace("{y}", norm.y) | |
191 | .replace("{z}", norm.z); | |
23cd2dcc RK |
192 | } |
193 | ||
194 | // Returns true if the tile is outside the current view. | |
195 | function isOutsideWindow(t) { | |
196 | var pos = decodeIndex(t); | |
197 | var x = pos[0]; | |
198 | var y = pos[1]; | |
199 | var z = pos[2]; | |
200 | ||
b395419b RK |
201 | var zoomFactor = Math.pow(2, gMaxZoom - z); |
202 | var wid = gCanvas.width * zoomFactor; | |
203 | var ht = gCanvas.height * zoomFactor; | |
23cd2dcc | 204 | |
b395419b RK |
205 | x *= zoomFactor; |
206 | y *= zoomFactor; | |
23cd2dcc | 207 | |
b395419b | 208 | var sz = gTileSize * zoomFactor; |
23cd2dcc RK |
209 | if (x > gPos.x + wid / 2 || y > gPos.y + ht / 2 || |
210 | x + sz < gPos.x - wid / 2 || y - sz < gPos.y - ht / 2) | |
211 | return true; | |
212 | return false; | |
213 | } | |
214 | ||
215 | function encodeIndex(x, y, z) { | |
216 | var norm = normaliseIndices(x, y, z); | |
217 | return norm.x + "," + norm.y + "," + norm.z; | |
218 | } | |
219 | ||
220 | function decodeIndex(encodedIdx) { | |
221 | return encodedIdx.split(",", 3); | |
222 | } | |
223 | ||
224 | function drawMap() { | |
225 | // Go through all the currently loaded tiles. If we don't want any of them remove them. | |
226 | // for (t in gTiles) { | |
227 | // if (isOutsideWindow(t)) | |
228 | // delete gTiles[t]; | |
229 | // } | |
b395419b RK |
230 | document.getElementById("zoomLevel").textContent = gPos.z; |
231 | gZoomFactor = Math.pow(2, gMaxZoom - gPos.z); | |
232 | var wid = gCanvas.width * gZoomFactor; // Width in level 18 pixels. | |
233 | var ht = gCanvas.height * gZoomFactor; // Height in level 18 pixels. | |
234 | var size = gTileSize * gZoomFactor; // Tile size in level 18 pixels. | |
23cd2dcc RK |
235 | |
236 | var xMin = gPos.x - wid / 2; // Corners of the window in level 18 pixels. | |
237 | var yMin = gPos.y - ht / 2; | |
238 | var xMax = gPos.x + wid / 2; | |
239 | var yMax = gPos.y + ht / 2; | |
240 | ||
3610c22d RK |
241 | if (gMapPrefsLoaded && mainDB) |
242 | gPrefs.set("position", gPos); | |
243 | ||
244 | // Go through all the tiles we want. | |
245 | // If any of them aren't loaded or being loaded, do so. | |
b47b4a65 RK |
246 | for (var x = Math.floor(xMin / size); x < Math.ceil(xMax / size); x++) { |
247 | for (var y = Math.floor(yMin / size); y < Math.ceil(yMax / size); y++) { | |
b395419b RK |
248 | var xoff = (x * size - xMin) / gZoomFactor; |
249 | var yoff = (y * size - yMin) / gZoomFactor; | |
250 | var tileKey = encodeIndex(x, y, gPos.z); | |
23cd2dcc | 251 | if (gTiles[tileKey] && gTiles[tileKey].complete) { |
3610c22d RK |
252 | // Round here is **CRUCIAL** otherwise the images are filtered |
253 | // and the performance sucks (more than expected). | |
23cd2dcc RK |
254 | gContext.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); |
255 | } | |
256 | else { | |
257 | if (!gTiles[tileKey]) { | |
258 | gTiles[tileKey] = new Image(); | |
259 | gTiles[tileKey].src = tileURL(x, y, gPos.z); | |
260 | gTiles[tileKey].onload = function() { | |
261 | // TODO: Just render this tile where it should be. | |
262 | // context.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); // Doesn't work for some reason. | |
263 | drawMap(); | |
264 | } | |
265 | } | |
b395419b | 266 | gContext.drawImage(gLoadingTile, Math.round(xoff), Math.round(yoff)); |
23cd2dcc RK |
267 | } |
268 | } | |
269 | } | |
55c4a0b7 RK |
270 | if (gTrack.length) |
271 | for (var i = 0; i < gTrack.length; i++) { | |
272 | drawTrackPoint(gTrack[i].coords.latitude, gTrack[i].coords.longitude); | |
273 | } | |
274 | } | |
275 | ||
276 | function drawTrackPoint(aLatitude, aLongitude) { | |
277 | var trackpoint = gps2xy(aLatitude, aLongitude); | |
278 | gContext.strokeStyle = "#FF0000"; | |
279 | gContext.fillStyle = gContext.strokeStyle; | |
280 | gContext.lineWidth = 2; | |
281 | gContext.lineCap = "round"; | |
282 | gContext.lineJoin = "round"; | |
283 | gContext.beginPath(); | |
284 | if (!gLastTrackPoint || gLastTrackPoint == trackpoint) { | |
285 | gContext.arc((trackpoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, | |
286 | (trackpoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2, | |
287 | gContext.lineWidth, 0, Math.PI * 2, false); | |
288 | gContext.fill(); | |
289 | } | |
290 | else { | |
291 | gContext.moveTo((gLastTrackPoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, | |
292 | (gLastTrackPoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2); | |
293 | gContext.lineTo((trackpoint.x - gPos.x) / gZoomFactor + gCanvas.width / 2, | |
294 | (trackpoint.y - gPos.y) / gZoomFactor + gCanvas.height / 2); | |
295 | gContext.stroke(); | |
296 | } | |
297 | gLastTrackPoint = trackpoint; | |
23cd2dcc RK |
298 | } |
299 | ||
300 | var mapEvHandler = { | |
301 | handleEvent: function(aEvent) { | |
302 | var touchEvent = aEvent.type.indexOf('touch') != -1; | |
303 | ||
b395419b | 304 | // Bail out on unwanted map moves, but not zoom-changing events. |
23cd2dcc RK |
305 | if (aEvent.type != "DOMMouseScroll" && aEvent.type != "mousewheel") { |
306 | // Bail out if this is neither a touch nor left-click. | |
307 | if (!touchEvent && aEvent.button != 0) | |
308 | return; | |
309 | ||
310 | // Bail out if the started touch can't be found. | |
311 | if (touchEvent && zoomstart && | |
312 | !aEvent.changedTouches.identifiedTouch(gZoomTouchID)) | |
313 | return; | |
314 | } | |
315 | ||
316 | var coordObj = touchEvent ? | |
317 | aEvent.changedTouches.identifiedTouch(gZoomTouchID) : | |
318 | aEvent; | |
319 | ||
320 | switch (aEvent.type) { | |
321 | case "mousedown": | |
322 | case "touchstart": | |
323 | if (touchEvent) { | |
324 | zoomTouchID = aEvent.changedTouches.item(0).identifier; | |
325 | coordObj = aEvent.changedTouches.identifiedTouch(gZoomTouchID); | |
326 | } | |
327 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
328 | var y = coordObj.clientY - gCanvas.offsetTop; | |
b395419b | 329 | |
23cd2dcc RK |
330 | if (touchEvent || aEvent.button === 0) { |
331 | gDragging = true; | |
332 | } | |
333 | gLastMouseX = x; | |
334 | gLastMouseY = y; | |
335 | break; | |
336 | case "mousemove": | |
337 | case "touchmove": | |
338 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
339 | var y = coordObj.clientY - gCanvas.offsetTop; | |
340 | if (gDragging === true) { | |
341 | var dX = x - gLastMouseX; | |
342 | var dY = y - gLastMouseY; | |
b395419b RK |
343 | gPos.x -= dX * gZoomFactor; |
344 | gPos.y -= dY * gZoomFactor; | |
23cd2dcc RK |
345 | drawMap(); |
346 | } | |
347 | gLastMouseX = x; | |
348 | gLastMouseY = y; | |
349 | break; | |
350 | case "mouseup": | |
351 | case "touchend": | |
352 | gDragging = false; | |
353 | break; | |
354 | case "mouseout": | |
355 | case "touchcancel": | |
356 | case "touchleave": | |
357 | //gDragging = false; | |
358 | break; | |
359 | case "DOMMouseScroll": | |
360 | case "mousewheel": | |
361 | var delta = 0; | |
362 | if (aEvent.wheelDelta) { | |
363 | delta = aEvent.wheelDelta / 120; | |
364 | if (window.opera) | |
365 | delta = -delta; | |
366 | } | |
367 | else if (aEvent.detail) { | |
368 | delta = -aEvent.detail / 3; | |
369 | } | |
370 | ||
b395419b RK |
371 | // Calculate new center of the map - same point stays under the mouse. |
372 | // This means that the pixel distance between the old center and point | |
373 | // must equal the pixel distance of the new center and that point. | |
374 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
375 | var y = coordObj.clientY - gCanvas.offsetTop; | |
55c4a0b7 RK |
376 | // Debug output: "coordinates" of the point the mouse was over. |
377 | /* | |
378 | var ptCoord = {x: gPos.x + (x - gCanvas.width / 2) * gZoomFactor, | |
379 | y: gPos.y + (x - gCanvas.height / 2) * gZoomFactor}; | |
380 | var gpsCoord = xy2gps(ptCoord.x, ptCoord.y); | |
381 | var pt2Coord = gps2xy(gpsCoord.latitude, gpsCoord.longitude); | |
382 | document.getElementById("debug").textContent = | |
383 | ptCoord.x + "/" + ptCoord.y + " - " + | |
384 | gpsCoord.latitude + "/" + gpsCoord.longitude + " - " + | |
385 | pt2Coord.x + "/" + pt2Coord.y; | |
386 | */ | |
b395419b RK |
387 | // Zoom factor after this action. |
388 | var newZoomFactor = Math.pow(2, gMaxZoom - gPos.z + (delta > 0 ? -1 : 1)); | |
389 | gPos.x -= (x - gCanvas.width / 2) * (newZoomFactor - gZoomFactor); | |
390 | gPos.y -= (y - gCanvas.height / 2) * (newZoomFactor - gZoomFactor); | |
b395419b | 391 | |
23cd2dcc RK |
392 | if (delta > 0) |
393 | zoomIn(); | |
394 | else if (delta < 0) | |
395 | zoomOut(); | |
396 | break; | |
397 | } | |
398 | } | |
399 | }; | |
55c4a0b7 | 400 | |
993fd081 | 401 | var geofake = { |
55c4a0b7 RK |
402 | tracking: false, |
403 | watchPosition: function(aSuccessCallback, aErrorCallback, aPrefObject) { | |
404 | this.tracking = true; | |
405 | var watchCall = function() { | |
406 | aSuccessCallback({timestamp: Date.now(), | |
3610c22d RK |
407 | coords: {latitude: 48.208174 + |
408 | (Math.random() - .5) / 5, | |
409 | longitude: 16.373819 + | |
410 | (Math.random() - .5) / 5, | |
55c4a0b7 RK |
411 | accuracy: 20}}); |
412 | if (geofake.tracking) | |
413 | setTimeout(watchCall, 1000); | |
414 | }; | |
415 | setTimeout(watchCall, 1000); | |
416 | return "foo"; | |
417 | }, | |
418 | clearWatch: function(aID) { | |
419 | this.tracking = false; | |
420 | } | |
421 | } | |
422 | ||
3610c22d RK |
423 | function setCentering(aCheckbox) { |
424 | if (gMapPrefsLoaded && mainDB) | |
425 | gPrefs.set("center_map", aCheckbox.checked); | |
426 | gCenterPosition = aCheckbox.checked; | |
427 | } | |
428 | ||
429 | function setTracking(aCheckbox) { | |
430 | if (gMapPrefsLoaded && mainDB) | |
431 | gPrefs.set("tracking_enabled", aCheckbox.checked); | |
432 | if (aCheckbox.checked) | |
433 | startTracking(); | |
434 | else | |
435 | endTracking(); | |
436 | } | |
437 | ||
55c4a0b7 | 438 | function startTracking() { |
993fd081 RK |
439 | var loopCnt = 0; |
440 | var getStoredTrack = function() { | |
441 | if (mainDB) | |
442 | gTrackStore.getList(function(aTPoints) { | |
4c13fe0c | 443 | //document.getElementById("debug").textContent = aTPoints.length + " points loaded."; |
993fd081 RK |
444 | if (aTPoints.length) { |
445 | gTrack = aTPoints; | |
446 | } | |
447 | }); | |
448 | else | |
449 | setTimeout(getStoredTrack, 100); | |
450 | loopCnt++; | |
451 | if (loopCnt > 20) | |
452 | return; | |
453 | }; | |
454 | getStoredTrack(); | |
55c4a0b7 RK |
455 | if (navigator.geolocation) { |
456 | //gGeoWatchID = geofake.watchPosition( | |
457 | gGeoWatchID = navigator.geolocation.watchPosition( | |
458 | function(position) { | |
459 | // Coords spec: https://developer.mozilla.org/en/XPCOM_Interface_Reference/NsIDOMGeoPositionCoords | |
993fd081 RK |
460 | var tPoint = {time: position.timestamp, |
461 | coords: position.coords, | |
462 | beginSegment: !gLastTrackPoint}; | |
463 | gTrack.push(tPoint); | |
464 | gTrackStore.push(tPoint); | |
55c4a0b7 | 465 | drawTrackPoint(position.coords.latitude, position.coords.longitude); |
05c21757 | 466 | if (gCenterPosition) { |
3610c22d RK |
467 | var posCoord = gps2xy(position.coords.latitude, |
468 | position.coords.longitude); | |
99631a75 RK |
469 | if (Math.abs(gPos.x - posCoord.x) > gCanvas.width * gZoomFactor / 4 || |
470 | Math.abs(gPos.y - posCoord.y) > gCanvas.height * gZoomFactor / 4) { | |
471 | gPos.x = posCoord.x; | |
472 | gPos.y = posCoord.y; | |
473 | drawMap(); | |
474 | } | |
05c21757 | 475 | } |
55c4a0b7 RK |
476 | }, |
477 | function(error) { | |
478 | // Ignore erros for the moment, but this is good for debugging. | |
479 | // See https://developer.mozilla.org/en/Using_geolocation#Handling_errors | |
480 | document.getElementById("debug").textContent = error.message; | |
481 | }, | |
482 | {enableHighAccuracy: true} | |
483 | ); | |
484 | } | |
485 | } | |
486 | ||
487 | function endTracking() { | |
488 | if (gGeoWatchID) { | |
3610c22d | 489 | //geofake.clearWatch(gGeoWatchID); |
55c4a0b7 RK |
490 | navigator.geolocation.clearWatch(gGeoWatchID); |
491 | } | |
492 | } | |
993fd081 RK |
493 | |
494 | function clearTrack() { | |
495 | gTrack = []; | |
496 | gTrackStore.clear(); | |
497 | drawMap(); | |
498 | } |