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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 | ||
43 | //drawMap(); | |
44 | ||
45 | var gPos = {x: 35630000.0, // Current position in the map in pixels at the maximum zoom level (18) | |
46 | y: 23670000.0, // The range is 0-67108864 (2^gMaxZoom * gTileSize) | |
47 | z: 5.0}; // This can be fractional if we are between zoom levels. | |
48 | ||
49 | var gLastMouseX = 0; | |
50 | var gLastMouseY = 0; | |
51 | ||
52 | // Used as an assiciative array. They keys have to be strings, ours will be "xindex,yindex,zindex" e.g. "13,245,12". | |
53 | var gTiles = {}; | |
54 | ||
55 | var gDragging = false; | |
56 | var gZoomTouchID; | |
57 | ||
58 | window.onload = function() { | |
59 | gCanvas = document.getElementById("map"); | |
60 | gContext = gCanvas.getContext("2d"); | |
61 | ||
62 | gCanvas.addEventListener("mouseup", mapEvHandler, false); | |
63 | gCanvas.addEventListener("mousemove", mapEvHandler, false); | |
64 | gCanvas.addEventListener("mousedown", mapEvHandler, false); | |
65 | gCanvas.addEventListener("mouseout", mapEvHandler, false); | |
66 | ||
67 | gCanvas.addEventListener("touchstart", mapEvHandler, false); | |
68 | gCanvas.addEventListener("touchmove", mapEvHandler, false); | |
69 | gCanvas.addEventListener("touchend", mapEvHandler, false); | |
70 | gCanvas.addEventListener("touchcancel", mapEvHandler, false); | |
71 | gCanvas.addEventListener("touchleave", mapEvHandler, false); | |
72 | ||
73 | gCanvas.addEventListener("DOMMouseScroll", mapEvHandler, false); | |
74 | gCanvas.addEventListener("mousewheel", mapEvHandler, false); | |
75 | ||
76 | resizeAndDraw(); | |
77 | } | |
78 | ||
79 | window.onresize = function() { | |
80 | resizeAndDraw(); | |
81 | } | |
82 | ||
83 | function resizeAndDraw() { | |
84 | var viewportWidth = window.innerWidth; | |
85 | var viewportHeight = window.innerHeight; | |
86 | ||
87 | var canvasWidth = viewportWidth * 0.98; | |
88 | var canvasHeight = (viewportHeight-110) * 0.98; | |
89 | gCanvas.style.position = "fixed"; | |
90 | gCanvas.width = canvasWidth; | |
91 | gCanvas.height = canvasHeight; | |
92 | drawMap(); | |
93 | } | |
94 | ||
95 | function zoomIn() { | |
96 | if (gPos.z < gMaxZoom) { | |
97 | gPos.z++; | |
98 | drawMap(); | |
99 | } | |
100 | } | |
101 | ||
102 | function zoomOut() { | |
103 | if (gPos.z > 0) { | |
104 | gPos.z--; | |
105 | drawMap(); | |
106 | } | |
107 | } | |
108 | ||
109 | // A sane mod function that works for negative numbers. | |
110 | // Returns a % b. | |
111 | function mod(a, b) { | |
112 | return ((a % b) + b) % b; | |
113 | } | |
114 | ||
115 | function normaliseIndices(x, y, z) { | |
116 | return {x: mod(x, Math.pow(2, z)), | |
117 | y: mod(y, Math.pow(2, z)), | |
118 | z: z}; | |
119 | } | |
120 | ||
121 | function tileURL(x, y, z) { | |
122 | var norm = normaliseIndices(x, y, z); | |
123 | var url = "http://tile.openstreetmap.org/" + norm.z + "/" + norm.x + "/" + norm.y + ".png"; | |
124 | return url; | |
125 | } | |
126 | ||
127 | // Returns true if the tile is outside the current view. | |
128 | function isOutsideWindow(t) { | |
129 | var pos = decodeIndex(t); | |
130 | var x = pos[0]; | |
131 | var y = pos[1]; | |
132 | var z = pos[2]; | |
133 | ||
134 | var wid = gCanvas.width * Math.pow(2, gMaxZoom - z); | |
135 | var ht = gCanvas.height * Math.pow(2, gMaxZoom - z); | |
136 | ||
137 | x *= Math.pow(2, gMaxZoom - z); | |
138 | y *= Math.pow(2, gMaxZoom - z); | |
139 | ||
140 | var sz = gTileSize * Math.pow(2, gMaxZoom - z); | |
141 | if (x > gPos.x + wid / 2 || y > gPos.y + ht / 2 || | |
142 | x + sz < gPos.x - wid / 2 || y - sz < gPos.y - ht / 2) | |
143 | return true; | |
144 | return false; | |
145 | } | |
146 | ||
147 | function encodeIndex(x, y, z) { | |
148 | var norm = normaliseIndices(x, y, z); | |
149 | return norm.x + "," + norm.y + "," + norm.z; | |
150 | } | |
151 | ||
152 | function decodeIndex(encodedIdx) { | |
153 | return encodedIdx.split(",", 3); | |
154 | } | |
155 | ||
156 | function drawMap() { | |
157 | // Go through all the currently loaded tiles. If we don't want any of them remove them. | |
158 | // for (t in gTiles) { | |
159 | // if (isOutsideWindow(t)) | |
160 | // delete gTiles[t]; | |
161 | // } | |
162 | var z = Math.round(gPos.z); | |
163 | var wid = gCanvas.width * Math.pow(2, gMaxZoom - z); // Width in level 18 pixels. | |
164 | var ht = gCanvas.height * Math.pow(2, gMaxZoom - z); // Height in level 18 pixels. | |
165 | var sz = gTileSize * Math.pow(2, gMaxZoom - z); // Tile size in level 18 pixels. | |
166 | ||
167 | var xMin = gPos.x - wid / 2; // Corners of the window in level 18 pixels. | |
168 | var yMin = gPos.y - ht / 2; | |
169 | var xMax = gPos.x + wid / 2; | |
170 | var yMax = gPos.y + ht / 2; | |
171 | ||
172 | // Go through all the tiles we want. If any of them aren't loaded or being loaded, do so. | |
173 | for (var x = Math.floor(xMin / sz); x < Math.ceil(xMax / sz); ++x) { | |
174 | for (var y = Math.floor(yMin / sz); y < Math.ceil(yMax / sz); ++y) { | |
175 | var xoff = (x * sz - xMin) / Math.pow(2, gMaxZoom - z); | |
176 | var yoff = (y * sz - yMin) / Math.pow(2, gMaxZoom - z); | |
177 | var tileKey = encodeIndex(x, y, z); | |
178 | if (gTiles[tileKey] && gTiles[tileKey].complete) { | |
179 | // Round here is **CRUICIAL** otherwise the images are filtered and the performance sucks (more than expected). | |
180 | gContext.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); | |
181 | } | |
182 | else { | |
183 | if (!gTiles[tileKey]) { | |
184 | gTiles[tileKey] = new Image(); | |
185 | gTiles[tileKey].src = tileURL(x, y, gPos.z); | |
186 | gTiles[tileKey].onload = function() { | |
187 | // TODO: Just render this tile where it should be. | |
188 | // context.drawImage(gTiles[tileKey], Math.round(xoff), Math.round(yoff)); // Doesn't work for some reason. | |
189 | drawMap(); | |
190 | } | |
191 | } | |
192 | gContext.fillStyle = "#ffffff"; | |
193 | gContext.fillRect(Math.round(xoff), Math.round(yoff), gTileSize, gTileSize); | |
194 | } | |
195 | } | |
196 | } | |
197 | } | |
198 | ||
199 | var mapEvHandler = { | |
200 | handleEvent: function(aEvent) { | |
201 | var touchEvent = aEvent.type.indexOf('touch') != -1; | |
202 | ||
203 | // Bail out on unwanted map moves, but not mousewheel events. | |
204 | if (aEvent.type != "DOMMouseScroll" && aEvent.type != "mousewheel") { | |
205 | // Bail out if this is neither a touch nor left-click. | |
206 | if (!touchEvent && aEvent.button != 0) | |
207 | return; | |
208 | ||
209 | // Bail out if the started touch can't be found. | |
210 | if (touchEvent && zoomstart && | |
211 | !aEvent.changedTouches.identifiedTouch(gZoomTouchID)) | |
212 | return; | |
213 | } | |
214 | ||
215 | var coordObj = touchEvent ? | |
216 | aEvent.changedTouches.identifiedTouch(gZoomTouchID) : | |
217 | aEvent; | |
218 | ||
219 | switch (aEvent.type) { | |
220 | case "mousedown": | |
221 | case "touchstart": | |
222 | if (touchEvent) { | |
223 | zoomTouchID = aEvent.changedTouches.item(0).identifier; | |
224 | coordObj = aEvent.changedTouches.identifiedTouch(gZoomTouchID); | |
225 | } | |
226 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
227 | var y = coordObj.clientY - gCanvas.offsetTop; | |
228 | if (touchEvent || aEvent.button === 0) { | |
229 | gDragging = true; | |
230 | } | |
231 | gLastMouseX = x; | |
232 | gLastMouseY = y; | |
233 | break; | |
234 | case "mousemove": | |
235 | case "touchmove": | |
236 | var x = coordObj.clientX - gCanvas.offsetLeft; | |
237 | var y = coordObj.clientY - gCanvas.offsetTop; | |
238 | if (gDragging === true) { | |
239 | var dX = x - gLastMouseX; | |
240 | var dY = y - gLastMouseY; | |
241 | gPos.x -= dX * Math.pow(2, gMaxZoom - gPos.z); | |
242 | gPos.y -= dY * Math.pow(2, gMaxZoom - gPos.z); | |
243 | drawMap(); | |
244 | } | |
245 | gLastMouseX = x; | |
246 | gLastMouseY = y; | |
247 | break; | |
248 | case "mouseup": | |
249 | case "touchend": | |
250 | gDragging = false; | |
251 | break; | |
252 | case "mouseout": | |
253 | case "touchcancel": | |
254 | case "touchleave": | |
255 | //gDragging = false; | |
256 | break; | |
257 | case "DOMMouseScroll": | |
258 | case "mousewheel": | |
259 | var delta = 0; | |
260 | if (aEvent.wheelDelta) { | |
261 | delta = aEvent.wheelDelta / 120; | |
262 | if (window.opera) | |
263 | delta = -delta; | |
264 | } | |
265 | else if (aEvent.detail) { | |
266 | delta = -aEvent.detail / 3; | |
267 | } | |
268 | ||
269 | if (delta > 0) | |
270 | zoomIn(); | |
271 | else if (delta < 0) | |
272 | zoomOut(); | |
273 | break; | |
274 | } | |
275 | } | |
276 | }; |