| 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 | 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"; |
| 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) |
| 62 | z: 5}; // This could be fractional if supported being between zoom levels. |
| 63 | |
| 64 | var gLastMouseX = 0; |
| 65 | var gLastMouseY = 0; |
| 66 | var gZoomFactor; |
| 67 | |
| 68 | // Used as an associative array. They keys have to be strings, ours will be "xindex,yindex,zindex" e.g. "13,245,12". |
| 69 | var gTiles = {}; |
| 70 | var gLoadingTile; |
| 71 | |
| 72 | var gDragging = false; |
| 73 | var gZoomTouchID; |
| 74 | |
| 75 | function initMap() { |
| 76 | gCanvas = document.getElementById("map"); |
| 77 | gContext = gCanvas.getContext("2d"); |
| 78 | if (!gActiveMap) |
| 79 | gActiveMap = "osm_mapnik"; |
| 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 | |
| 95 | document.getElementById("copyright").innerHTML = |
| 96 | gMapStyles[gActiveMap].copyright; |
| 97 | |
| 98 | gLoadingTile = new Image(); |
| 99 | gLoadingTile.src = "style/loading.png"; |
| 100 | } |
| 101 | |
| 102 | function resizeAndDraw() { |
| 103 | var viewportWidth = window.innerWidth; |
| 104 | var viewportHeight = window.innerHeight; |
| 105 | |
| 106 | var canvasWidth = viewportWidth * 0.98; |
| 107 | var canvasHeight = (viewportHeight - 100) * 0.98; |
| 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 | |
| 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 | |
| 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) { |
| 144 | var zoomFactor = Math.pow(2, z); |
| 145 | return {x: mod(x, zoomFactor), |
| 146 | y: mod(y, zoomFactor), |
| 147 | z: z}; |
| 148 | } |
| 149 | |
| 150 | function tileURL(x, y, z) { |
| 151 | var norm = normaliseIndices(x, y, z); |
| 152 | return gMapStyles[gActiveMap].url.replace("{x}", norm.x) |
| 153 | .replace("{y}", norm.y) |
| 154 | .replace("{z}", norm.z); |
| 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 | |
| 164 | var zoomFactor = Math.pow(2, gMaxZoom - z); |
| 165 | var wid = gCanvas.width * zoomFactor; |
| 166 | var ht = gCanvas.height * zoomFactor; |
| 167 | |
| 168 | x *= zoomFactor; |
| 169 | y *= zoomFactor; |
| 170 | |
| 171 | var sz = gTileSize * zoomFactor; |
| 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 | // } |
| 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. |
| 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. |
| 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++) { |
| 207 | var xoff = (x * size - xMin) / gZoomFactor; |
| 208 | var yoff = (y * size - yMin) / gZoomFactor; |
| 209 | var tileKey = encodeIndex(x, y, gPos.z); |
| 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 | } |
| 224 | gContext.drawImage(gLoadingTile, Math.round(xoff), Math.round(yoff)); |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | var mapEvHandler = { |
| 231 | handleEvent: function(aEvent) { |
| 232 | var touchEvent = aEvent.type.indexOf('touch') != -1; |
| 233 | |
| 234 | // Bail out on unwanted map moves, but not zoom-changing events. |
| 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; |
| 259 | |
| 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; |
| 273 | gPos.x -= dX * gZoomFactor; |
| 274 | gPos.y -= dY * gZoomFactor; |
| 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 | |
| 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 | |
| 312 | if (delta > 0) |
| 313 | zoomIn(); |
| 314 | else if (delta < 0) |
| 315 | zoomOut(); |
| 316 | break; |
| 317 | } |
| 318 | } |
| 319 | }; |