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