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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 | |
45 | osm_mapnik: | |
46 | {name: "OpenStreetMap (Mapnik)", | |
47 | url: "http://tile.openstreetmap.org/{z}/{x}/{y}.png", | |
48 | 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>'}, | |
49 | osm_tilesathome: | |
50 | {name: "OpenStreetMap (OSMarender)", | |
51 | url: "http://tah.openstreetmap.org/Tiles/tile/{z}/{x}/{y}.png", | |
52 | 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>'}, | |
53 | mapquest_open: | |
54 | {name: "MapQuest Open", | |
55 | url: "http://otile1.mqcdn.com/tiles/1.0.0/osm/{z}/{x}/{y}.png", | |
56 | 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>.'} | |
57 | }; | |
58 | var gActiveMap = "osm_mapnik"; | |
23cd2dcc RK |
59 | |
60 | var gPos = {x: 35630000.0, // Current position in the map in pixels at the maximum zoom level (18) | |
61 | y: 23670000.0, // The range is 0-67108864 (2^gMaxZoom * gTileSize) | |
b395419b | 62 | z: 5}; // This could be fractional if supported being between zoom levels. |
23cd2dcc RK |
63 | |
64 | var gLastMouseX = 0; | |
65 | var gLastMouseY = 0; | |
b395419b | 66 | var gZoomFactor; |
23cd2dcc | 67 | |
b395419b | 68 | // Used as an associative array. They keys have to be strings, ours will be "xindex,yindex,zindex" e.g. "13,245,12". |
23cd2dcc | 69 | var gTiles = {}; |
b395419b | 70 | var gLoadingTile; |
23cd2dcc RK |
71 | |
72 | var gDragging = false; | |
73 | var gZoomTouchID; | |
74 | ||
b47b4a65 | 75 | function initMap() { |
23cd2dcc RK |
76 | gCanvas = document.getElementById("map"); |
77 | gContext = gCanvas.getContext("2d"); | |
b47b4a65 RK |
78 | if (!gActiveMap) |
79 | gActiveMap = "osm_mapnik"; | |
23cd2dcc RK |
80 | |
81 | gCanvas.addEventListener("mouseup", mapEvHandler, false); | |
82 | gCanvas.addEventListener("mousemove", mapEvHandler, false); | |
83 | gCanvas.addEventListener("mousedown", mapEvHandler, false); | |
84 | gCanvas.addEventListener("mouseout", mapEvHandler, false); | |
85 | ||
86 | gCanvas.addEventListener("touchstart", mapEvHandler, false); | |
87 | gCanvas.addEventListener("touchmove", mapEvHandler, false); | |
88 | gCanvas.addEventListener("touchend", mapEvHandler, false); | |
89 | gCanvas.addEventListener("touchcancel", mapEvHandler, false); | |
90 | gCanvas.addEventListener("touchleave", mapEvHandler, false); | |
91 | ||
92 | gCanvas.addEventListener("DOMMouseScroll", mapEvHandler, false); | |
93 | gCanvas.addEventListener("mousewheel", mapEvHandler, false); | |
94 | ||
b47b4a65 RK |
95 | document.getElementById("copyright").innerHTML = |
96 | gMapStyles[gActiveMap].copyright; | |
b395419b RK |
97 | |
98 | gLoadingTile = new Image(); | |
99 | gLoadingTile.src = "style/loading.png"; | |
23cd2dcc RK |
100 | } |
101 | ||
102 | function resizeAndDraw() { | |
103 | var viewportWidth = window.innerWidth; | |
104 | var viewportHeight = window.innerHeight; | |
105 | ||
106 | var canvasWidth = viewportWidth * 0.98; | |
b47b4a65 | 107 | var canvasHeight = (viewportHeight - 100) * 0.98; |
23cd2dcc RK |
108 | gCanvas.style.position = "fixed"; |
109 | gCanvas.width = canvasWidth; | |
110 | gCanvas.height = canvasHeight; | |
111 | drawMap(); | |
112 | } | |
113 | ||
114 | function zoomIn() { | |
115 | if (gPos.z < gMaxZoom) { | |
116 | gPos.z++; | |
117 | drawMap(); | |
118 | } | |
119 | } | |
120 | ||
121 | function zoomOut() { | |
122 | if (gPos.z > 0) { | |
123 | gPos.z--; | |
124 | drawMap(); | |
125 | } | |
126 | } | |
127 | ||
b47b4a65 RK |
128 | function setMapStyle() { |
129 | var mapSel = document.getElementById("mapSelector"); | |
130 | if (mapSel.selectedIndex >= 0 && gActiveMap != mapSel.value) { | |
131 | gActiveMap = mapSel.value; | |
132 | gTiles = {}; | |
133 | drawMap(); | |
134 | } | |
135 | } | |
136 | ||
23cd2dcc RK |
137 | // A sane mod function that works for negative numbers. |
138 | // Returns a % b. | |
139 | function mod(a, b) { | |
140 | return ((a % b) + b) % b; | |
141 | } | |
142 | ||
143 | function normaliseIndices(x, y, z) { | |
b395419b RK |
144 | var zoomFactor = Math.pow(2, z); |
145 | return {x: mod(x, zoomFactor), | |
146 | y: mod(y, zoomFactor), | |
23cd2dcc RK |
147 | z: z}; |
148 | } | |
149 | ||
150 | function tileURL(x, y, z) { | |
151 | var norm = normaliseIndices(x, y, z); | |
b47b4a65 RK |
152 | return gMapStyles[gActiveMap].url.replace("{x}", norm.x) |
153 | .replace("{y}", norm.y) | |
154 | .replace("{z}", norm.z); | |
23cd2dcc RK |
155 | } |
156 | ||
157 | // Returns true if the tile is outside the current view. | |
158 | function isOutsideWindow(t) { | |
159 | var pos = decodeIndex(t); | |
160 | var x = pos[0]; | |
161 | var y = pos[1]; | |
162 | var z = pos[2]; | |
163 | ||
b395419b RK |
164 | var zoomFactor = Math.pow(2, gMaxZoom - z); |
165 | var wid = gCanvas.width * zoomFactor; | |
166 | var ht = gCanvas.height * zoomFactor; | |
23cd2dcc | 167 | |
b395419b RK |
168 | x *= zoomFactor; |
169 | y *= zoomFactor; | |
23cd2dcc | 170 | |
b395419b | 171 | var sz = gTileSize * zoomFactor; |
23cd2dcc RK |
172 | if (x > gPos.x + wid / 2 || y > gPos.y + ht / 2 || |
173 | x + sz < gPos.x - wid / 2 || y - sz < gPos.y - ht / 2) | |
174 | return true; | |
175 | return false; | |
176 | } | |
177 | ||
178 | function encodeIndex(x, y, z) { | |
179 | var norm = normaliseIndices(x, y, z); | |
180 | return norm.x + "," + norm.y + "," + norm.z; | |
181 | } | |
182 | ||
183 | function decodeIndex(encodedIdx) { | |
184 | return encodedIdx.split(",", 3); | |
185 | } | |
186 | ||
187 | function drawMap() { | |
188 | // Go through all the currently loaded tiles. If we don't want any of them remove them. | |
189 | // for (t in gTiles) { | |
190 | // if (isOutsideWindow(t)) | |
191 | // delete gTiles[t]; | |
192 | // } | |
b395419b RK |
193 | document.getElementById("zoomLevel").textContent = gPos.z; |
194 | gZoomFactor = Math.pow(2, gMaxZoom - gPos.z); | |
195 | var wid = gCanvas.width * gZoomFactor; // Width in level 18 pixels. | |
196 | var ht = gCanvas.height * gZoomFactor; // Height in level 18 pixels. | |
197 | var size = gTileSize * gZoomFactor; // Tile size in level 18 pixels. | |
23cd2dcc RK |
198 | |
199 | var xMin = gPos.x - wid / 2; // Corners of the window in level 18 pixels. | |
200 | var yMin = gPos.y - ht / 2; | |
201 | var xMax = gPos.x + wid / 2; | |
202 | var yMax = gPos.y + ht / 2; | |
203 | ||
204 | // Go through all the tiles we want. If any of them aren't loaded or being loaded, do so. | |
b47b4a65 RK |
205 | for (var x = Math.floor(xMin / size); x < Math.ceil(xMax / size); x++) { |
206 | for (var y = Math.floor(yMin / size); y < Math.ceil(yMax / size); y++) { | |
b395419b RK |
207 | var xoff = (x * size - xMin) / gZoomFactor; |
208 | var yoff = (y * size - yMin) / gZoomFactor; | |
209 | var tileKey = encodeIndex(x, y, gPos.z); | |
23cd2dcc RK |
210 | if (gTiles[tileKey] && gTiles[tileKey].complete) { |
211 | // Round here is **CRUICIAL** otherwise the images are filtered and the performance sucks (more than expected). | |
212 | gContext.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); | |
213 | } | |
214 | else { | |
215 | if (!gTiles[tileKey]) { | |
216 | gTiles[tileKey] = new Image(); | |
217 | gTiles[tileKey].src = tileURL(x, y, gPos.z); | |
218 | gTiles[tileKey].onload = function() { | |
219 | // TODO: Just render this tile where it should be. | |
220 | // context.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); // Doesn't work for some reason. | |
221 | drawMap(); | |
222 | } | |
223 | } | |
b395419b | 224 | gContext.drawImage(gLoadingTile, Math.round(xoff), Math.round(yoff)); |
23cd2dcc RK |
225 | } |
226 | } | |
227 | } | |
228 | } | |
229 | ||
230 | var mapEvHandler = { | |
231 | handleEvent: function(aEvent) { | |
232 | var touchEvent = aEvent.type.indexOf('touch') != -1; | |
233 | ||
b395419b | 234 | // Bail out on unwanted map moves, but not zoom-changing events. |
23cd2dcc RK |
235 | if (aEvent.type != "DOMMouseScroll" && aEvent.type != "mousewheel") { |
236 | // Bail out if this is neither a touch nor left-click. | |
237 | if (!touchEvent && aEvent.button != 0) | |
238 | return; | |
239 | ||
240 | // Bail out if the started touch can't be found. | |
241 | if (touchEvent && zoomstart && | |
242 | !aEvent.changedTouches.identifiedTouch(gZoomTouchID)) | |
243 | return; | |
244 | } | |
245 | ||
246 | var coordObj = touchEvent ? | |
247 | aEvent.changedTouches.identifiedTouch(gZoomTouchID) : | |
248 | aEvent; | |
249 | ||
250 | switch (aEvent.type) { | |
251 | case "mousedown": | |
252 | case "touchstart": | |
253 | if (touchEvent) { | |
254 | zoomTouchID = aEvent.changedTouches.item(0).identifier; | |
255 | coordObj = aEvent.changedTouches.identifiedTouch(gZoomTouchID); | |
256 | } | |
257 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
258 | var y = coordObj.clientY - gCanvas.offsetTop; | |
b395419b | 259 | |
23cd2dcc RK |
260 | if (touchEvent || aEvent.button === 0) { |
261 | gDragging = true; | |
262 | } | |
263 | gLastMouseX = x; | |
264 | gLastMouseY = y; | |
265 | break; | |
266 | case "mousemove": | |
267 | case "touchmove": | |
268 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
269 | var y = coordObj.clientY - gCanvas.offsetTop; | |
270 | if (gDragging === true) { | |
271 | var dX = x - gLastMouseX; | |
272 | var dY = y - gLastMouseY; | |
b395419b RK |
273 | gPos.x -= dX * gZoomFactor; |
274 | gPos.y -= dY * gZoomFactor; | |
23cd2dcc RK |
275 | drawMap(); |
276 | } | |
277 | gLastMouseX = x; | |
278 | gLastMouseY = y; | |
279 | break; | |
280 | case "mouseup": | |
281 | case "touchend": | |
282 | gDragging = false; | |
283 | break; | |
284 | case "mouseout": | |
285 | case "touchcancel": | |
286 | case "touchleave": | |
287 | //gDragging = false; | |
288 | break; | |
289 | case "DOMMouseScroll": | |
290 | case "mousewheel": | |
291 | var delta = 0; | |
292 | if (aEvent.wheelDelta) { | |
293 | delta = aEvent.wheelDelta / 120; | |
294 | if (window.opera) | |
295 | delta = -delta; | |
296 | } | |
297 | else if (aEvent.detail) { | |
298 | delta = -aEvent.detail / 3; | |
299 | } | |
300 | ||
b395419b RK |
301 | // Calculate new center of the map - same point stays under the mouse. |
302 | // This means that the pixel distance between the old center and point | |
303 | // must equal the pixel distance of the new center and that point. | |
304 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
305 | var y = coordObj.clientY - gCanvas.offsetTop; | |
306 | // Zoom factor after this action. | |
307 | var newZoomFactor = Math.pow(2, gMaxZoom - gPos.z + (delta > 0 ? -1 : 1)); | |
308 | gPos.x -= (x - gCanvas.width / 2) * (newZoomFactor - gZoomFactor); | |
309 | gPos.y -= (y - gCanvas.height / 2) * (newZoomFactor - gZoomFactor); | |
310 | document.getElementById("debug").textContent = newZoomFactor + " - " + gZoomFactor; | |
311 | ||
23cd2dcc RK |
312 | if (delta > 0) |
313 | zoomIn(); | |
314 | else if (delta < 0) | |
315 | zoomOut(); | |
316 | break; | |
317 | } | |
318 | } | |
319 | }; |