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modestmaps.js
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modestmaps.js
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/*!
* Modest Maps JS v1.0.0-beta1
* http://modestmaps.com/
*
* Copyright (c) 2011 Stamen Design, All Rights Reserved.
*
* Open source under the BSD License.
* http://creativecommons.org/licenses/BSD/
*
* Versioned using Semantic Versioning (v.major.minor.patch)
* See CHANGELOG and http://semver.org/ for more details.
*
*/
var previousMM = MM;
// namespacing for backwards-compatibility
if (!com) {
var com = {};
if (!com.modestmaps) com.modestmaps = {};
}
var MM = com.modestmaps = {
noConflict: function() {
MM = previousMM;
return this;
}
};
(function(MM) {
// Make inheritance bearable: clone one level of properties
MM.extend = function(child, parent) {
for (var property in parent.prototype) {
if (typeof child.prototype[property] == "undefined") {
child.prototype[property] = parent.prototype[property];
}
}
return child;
};
MM.getFrame = function () {
// native animation frames
// http://webstuff.nfshost.com/anim-timing/Overview.html
// http://dev.chromium.org/developers/design-documents/requestanimationframe-implementation
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// can't apply these directly to MM because Chrome needs window
// to own webkitRequestAnimationFrame (for example)
// perhaps we should namespace an alias onto window instead?
// e.g. window.mmRequestAnimationFrame?
return function(callback) {
(window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) {
window.setTimeout(function () {
callback(+new Date());
}, 10);
})(callback);
};
}();
// Inspired by LeafletJS
MM.transformProperty = (function(props) {
if (!this.document) return; // node.js safety
var style = document.documentElement.style;
for (var i = 0; i < props.length; i++) {
if (props[i] in style) {
return props[i];
}
}
return false;
})(['transformProperty', 'WebkitTransform', 'OTransform', 'MozTransform', 'msTransform']);
MM.matrixString = function(point) {
// Make the result of point.scale * point.width a whole number.
if (point.scale * point.width % 1) {
point.scale += (1 - point.scale * point.width % 1) / point.width;
}
var scale = point.scale || 1;
if (MM._browser.webkit3d) {
// return 'scale3d(' + scale + ',' + scale + ', 1) translate3d(' + point.x.toFixed(6) + 'px,' + point.y.toFixed(6) + 'px, 0px)';
return 'scale3d(' + scale + ',' + scale + ', 1) translate3d(' + point.x.toFixed(0) + 'px,' + point.y.toFixed(0) + 'px, 0px)';
} else {
return 'scale(' + scale + ',' + scale + ') translate(' + point.x.toFixed(6) + 'px,' + point.y.toFixed(6) + 'px)';
}
};
MM._browser = (function(window) {
return {
webkit: ('WebKitCSSMatrix' in window),
webkit3d: ('WebKitCSSMatrix' in window) && ('m11' in new WebKitCSSMatrix())
};
})(this); // use this for node.js global
MM.moveElement = function(el, point) {
if (MM.transformProperty) {
// Optimize for identity transforms, where you don't actually
// need to change this element's string. Browsers can optimize for
// the .style.left case but not for this CSS case.
if (!point.scale) point.scale = 1;
if (!point.width) point.width = 0;
if (!point.height) point.height = 0;
var ms = MM.matrixString(point);
if (el[MM.transformProperty] !== ms) {
el.style[MM.transformProperty] =
el[MM.transformProperty] = ms;
}
} else {
el.style.left = point.x + 'px';
el.style.top = point.y + 'px';
// Don't set width unless asked to: this is performance-intensive
// and not always necessary
if (point.width && point.height && point.scale) {
el.style.width = Math.ceil(point.width * point.scale) + 'px';
el.style.height = Math.ceil(point.height * point.scale) + 'px';
}
}
};
// Events
// Cancel an event: prevent it from bubbling
MM.cancelEvent = function(e) {
// there's more than one way to skin this cat
e.cancelBubble = true;
e.cancel = true;
e.returnValue = false;
if (e.stopPropagation) { e.stopPropagation(); }
if (e.preventDefault) { e.preventDefault(); }
return false;
};
// From underscore.js
MM.bind = function(func, obj) {
var slice = Array.prototype.slice;
var nativeBind = Function.prototype.bind;
if (func.bind === nativeBind && nativeBind) {
return nativeBind.apply(func, slice.call(arguments, 1));
}
var args = slice.call(arguments, 2);
return function() {
return func.apply(obj, args.concat(slice.call(arguments)));
};
};
MM.coerceLayer = function(layerish) {
if (typeof layerish == 'string') {
// Probably a template string
return new MM.Layer(new MM.TemplatedMapProvider(layerish));
} else if ('draw' in layerish && typeof layerish.draw == 'function') {
// good enough, though we should probably enforce .parent and .destroy() too
return layerish;
} else {
// probably a MapProvider
return new MM.Layer(layerish);
}
};
// see http://ejohn.org/apps/jselect/event.html for the originals
MM.addEvent = function(obj, type, fn) {
if (obj.addEventListener) {
obj.addEventListener(type, fn, false);
if (type == 'mousewheel') {
obj.addEventListener('DOMMouseScroll', fn, false);
}
} else if (obj.attachEvent) {
obj['e'+type+fn] = fn;
obj[type+fn] = function(){ obj['e'+type+fn](window.event); };
obj.attachEvent('on'+type, obj[type+fn]);
}
};
MM.removeEvent = function( obj, type, fn ) {
if (obj.removeEventListener) {
obj.removeEventListener(type, fn, false);
if (type == 'mousewheel') {
obj.removeEventListener('DOMMouseScroll', fn, false);
}
} else if (obj.detachEvent) {
obj.detachEvent('on'+type, obj[type+fn]);
obj[type+fn] = null;
}
};
// Cross-browser function to get current element style property
MM.getStyle = function(el,styleProp) {
if (el.currentStyle)
return el.currentStyle[styleProp];
else if (window.getComputedStyle)
return document.defaultView.getComputedStyle(el,null).getPropertyValue(styleProp);
};
// Point
MM.Point = function(x, y) {
this.x = parseFloat(x);
this.y = parseFloat(y);
};
MM.Point.prototype = {
x: 0,
y: 0,
toString: function() {
return "(" + this.x.toFixed(3) + ", " + this.y.toFixed(3) + ")";
},
copy: function() {
return new MM.Point(this.x, this.y);
}
};
// Get the euclidean distance between two points
MM.Point.distance = function(p1, p2) {
return Math.sqrt(
Math.pow(p2.x - p1.x, 2) +
Math.pow(p2.y - p1.y, 2));
};
// Get a point between two other points, biased by `t`.
MM.Point.interpolate = function(p1, p2, t) {
return new MM.Point(
p1.x + (p2.x - p1.x) * t,
p1.y + (p2.y - p1.y) * t);
};
// Coordinate
// ----------
// An object representing a tile position, at as specified zoom level.
// This is not necessarily a precise tile - `row`, `column`, and
// `zoom` can be floating-point numbers, and the `container()` function
// can be used to find the actual tile that contains the point.
MM.Coordinate = function(row, column, zoom) {
this.row = row;
this.column = column;
this.zoom = zoom;
};
MM.Coordinate.prototype = {
row: 0,
column: 0,
zoom: 0,
toString: function() {
return "(" + this.row.toFixed(3) +
", " + this.column.toFixed(3) +
" @" + this.zoom.toFixed(3) + ")";
},
// Quickly generate a string representation of this coordinate to
// index it in hashes.
toKey: function() {
// We've tried to use efficient hash functions here before but we took
// them out. Contributions welcome but watch out for collisions when the
// row or column are negative and check thoroughly (exhaustively) before
// committing.
return this.zoom + ',' + this.row + ',' + this.column;
},
// Clone this object.
copy: function() {
return new MM.Coordinate(this.row, this.column, this.zoom);
},
// Get the actual, rounded-number tile that contains this point.
container: function() {
// using floor here (not parseInt, ~~) because we want -0.56 --> -1
return new MM.Coordinate(Math.floor(this.row),
Math.floor(this.column),
Math.floor(this.zoom));
},
// Recalculate this Coordinate at a different zoom level and return the
// new object.
zoomTo: function(destination) {
var power = Math.pow(2, destination - this.zoom);
return new MM.Coordinate(this.row * power,
this.column * power,
destination);
},
// Recalculate this Coordinate at a different relative zoom level and return the
// new object.
zoomBy: function(distance) {
var power = Math.pow(2, distance);
return new MM.Coordinate(this.row * power,
this.column * power,
this.zoom + distance);
},
// Move this coordinate up by `dist` coordinates
up: function(dist) {
if (dist === undefined) dist = 1;
return new MM.Coordinate(this.row - dist, this.column, this.zoom);
},
// Move this coordinate right by `dist` coordinates
right: function(dist) {
if (dist === undefined) dist = 1;
return new MM.Coordinate(this.row, this.column + dist, this.zoom);
},
// Move this coordinate down by `dist` coordinates
down: function(dist) {
if (dist === undefined) dist = 1;
return new MM.Coordinate(this.row + dist, this.column, this.zoom);
},
// Move this coordinate left by `dist` coordinates
left: function(dist) {
if (dist === undefined) dist = 1;
return new MM.Coordinate(this.row, this.column - dist, this.zoom);
}
};
// Location
// --------
MM.Location = function(lat, lon) {
this.lat = parseFloat(lat);
this.lon = parseFloat(lon);
};
MM.Location.prototype = {
lat: 0,
lon: 0,
toString: function() {
return "(" + this.lat.toFixed(3) + ", " + this.lon.toFixed(3) + ")";
},
copy: function() {
return new MM.Location(this.lat, this.lon);
}
};
// returns approximate distance between start and end locations
//
// default unit is meters
//
// you can specify different units by optionally providing the
// earth's radius in the units you desire
//
// Default is 6,378,000 metres, suggested values are:
//
// * 3963.1 statute miles
// * 3443.9 nautical miles
// * 6378 km
//
// see [Formula and code for calculating distance based on two lat/lon locations](http://jan.ucc.nau.edu/~cvm/latlon_formula.html)
MM.Location.distance = function(l1, l2, r) {
if (!r) {
// default to meters
r = 6378000;
}
var deg2rad = Math.PI / 180.0,
a1 = l1.lat * deg2rad,
b1 = l1.lon * deg2rad,
a2 = l2.lat * deg2rad,
b2 = l2.lon * deg2rad,
c = Math.cos(a1) * Math.cos(b1) * Math.cos(a2) * Math.cos(b2),
d = Math.cos(a1) * Math.sin(b1) * Math.cos(a2) * Math.sin(b2),
e = Math.sin(a1) * Math.sin(a2);
return Math.acos(c + d + e) * r;
};
// Interpolates along a great circle, f between 0 and 1
//
// * FIXME: could be heavily optimized (lots of trig calls to cache)
// * FIXME: could be inmproved for calculating a full path
MM.Location.interpolate = function(l1, l2, f) {
if (l1.lat === l2.lat && l1.lon === l2.lon) {
return new MM.Location(l1.lat, l1.lon);
}
var deg2rad = Math.PI / 180.0,
lat1 = l1.lat * deg2rad,
lon1 = l1.lon * deg2rad,
lat2 = l2.lat * deg2rad,
lon2 = l2.lon * deg2rad;
var d = 2 * Math.asin(
Math.sqrt(
Math.pow(Math.sin((lat1 - lat2) / 2), 2) +
Math.cos(lat1) * Math.cos(lat2) *
Math.pow(Math.sin((lon1 - lon2) / 2), 2)));
var A = Math.sin((1-f)*d)/Math.sin(d);
var B = Math.sin(f*d)/Math.sin(d);
var x = A * Math.cos(lat1) * Math.cos(lon1) +
B * Math.cos(lat2) * Math.cos(lon2);
var y = A * Math.cos(lat1) * Math.sin(lon1) +
B * Math.cos(lat2) * Math.sin(lon2);
var z = A * Math.sin(lat1) + B * Math.sin(lat2);
var latN = Math.atan2(z, Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)));
var lonN = Math.atan2(y,x);
return new MM.Location(latN / deg2rad, lonN / deg2rad);
};
// Returns bearing from one point to another
//
// * FIXME: bearing is not constant along significant great circle arcs.
MM.Location.bearing = function(l1, l2) {
var result = Math.atan2(
Math.sin(lon1 - lon2) *
Math.cos(lat2),
Math.cos(lat1) *
Math.sin(lat2) -
Math.sin(lat1) *
Math.cos(lat2) *
Math.cos(lon1 - lon2)
) / -(Math.PI / 180);
// map it into 0-360 range
return (result < 0) ? result + 360 : result;
};
// Location from string
MM.Location.fromString = function(location){
var split = feature.split(",");
return new MM.Location(split[1],split[0])
};
// Extent
// ----------
// An object representing a map's rectangular extent, defined by its north,
// south, east and west bounds.
MM.Extent = function(north, west, south, east) {
if (north instanceof MM.Location &&
west instanceof MM.Location) {
var northwest = north,
southeast = west;
north = northwest.lat;
west = northwest.lon;
south = southeast.lat;
east = southeast.lon;
}
if (isNaN(south)) south = north;
if (isNaN(east)) east = west;
this.north = Math.max(north, south);
this.south = Math.min(north, south);
this.east = Math.max(east, west);
this.west = Math.min(east, west);
};
MM.Extent.prototype = {
// boundary attributes
north: 0,
south: 0,
east: 0,
west: 0,
copy: function() {
return new MM.Extent(this.north, this.west, this.south, this.east);
},
toString: function(precision) {
if (isNaN(precision)) precision = 3;
return [
this.north.toFixed(precision),
this.west.toFixed(precision),
this.south.toFixed(precision),
this.east.toFixed(precision)
].join(", ");
},
// getters for the corner locations
northWest: function() {
return new MM.Location(this.north, this.west);
},
southEast: function() {
return new MM.Location(this.south, this.east);
},
northEast: function() {
return new MM.Location(this.north, this.east);
},
southWest: function() {
return new MM.Location(this.south, this.west);
},
// getter for the center location
center: function() {
return new MM.Location(
this.south + (this.north - this.south) / 2,
this.east + (this.west - this.east) / 2
);
},
// extend the bounds to include a location's latitude and longitude
encloseLocation: function(loc) {
if (loc.lat > this.north) this.north = loc.lat;
if (loc.lat < this.south) this.south = loc.lat;
if (loc.lon > this.east) this.east = loc.lon;
if (loc.lon < this.west) this.west = loc.lon;
},
// extend the bounds to include multiple locations
encloseLocations: function(locations) {
var len = locations.length;
for (var i = 0; i < len; i++) {
this.encloseLocation(locations[i]);
}
},
// reset bounds from a list of locations
setFromLocations: function(locations) {
var len = locations.length,
first = locations[0];
this.north = this.south = first.lat;
this.east = this.west = first.lon;
for (var i = 1; i < len; i++) {
this.encloseLocation(locations[i]);
}
},
// extend the bounds to include another extent
encloseExtent: function(extent) {
if (extent.north > this.north) this.north = extent.north;
if (extent.south < this.south) this.south = extent.south;
if (extent.east > this.east) this.east = extent.east;
if (extent.west < this.west) this.west = extent.west;
},
// determine if a location is within this extent
containsLocation: function(loc) {
return loc.lat >= this.south &&
loc.lat <= this.north &&
loc.lon >= this.west &&
loc.lon <= this.east;
},
// turn an extent into an array of locations containing its northwest
// and southeast corners (used in MM.Map.setExtent())
toArray: function() {
return [this.northWest(), this.southEast()];
}
};
MM.Extent.fromString = function(str) {
var parts = str.split(/\s*,\s*/);
if (parts.length != 4) {
throw "Invalid extent string (expecting 4 comma-separated numbers)";
}
return new MM.Extent(
parseFloat(parts[0]),
parseFloat(parts[1]),
parseFloat(parts[2]),
parseFloat(parts[3])
);
};
MM.Extent.fromArray = function(locations) {
var extent = new MM.Extent();
extent.setFromLocations(locations);
return extent;
};
// Transformation
// --------------
MM.Transformation = function(ax, bx, cx, ay, by, cy) {
this.ax = ax;
this.bx = bx;
this.cx = cx;
this.ay = ay;
this.by = by;
this.cy = cy;
};
MM.Transformation.prototype = {
ax: 0,
bx: 0,
cx: 0,
ay: 0,
by: 0,
cy: 0,
transform: function(point) {
return new MM.Point(this.ax * point.x + this.bx * point.y + this.cx,
this.ay * point.x + this.by * point.y + this.cy);
},
untransform: function(point) {
return new MM.Point((point.x * this.by - point.y * this.bx -
this.cx * this.by + this.cy * this.bx) /
(this.ax * this.by - this.ay * this.bx),
(point.x * this.ay - point.y * this.ax -
this.cx * this.ay + this.cy * this.ax) /
(this.bx * this.ay - this.by * this.ax));
}
};
// Generates a transform based on three pairs of points,
// a1 -> a2, b1 -> b2, c1 -> c2.
MM.deriveTransformation = function(a1x, a1y, a2x, a2y,
b1x, b1y, b2x, b2y,
c1x, c1y, c2x, c2y) {
var x = MM.linearSolution(a1x, a1y, a2x,
b1x, b1y, b2x,
c1x, c1y, c2x);
var y = MM.linearSolution(a1x, a1y, a2y,
b1x, b1y, b2y,
c1x, c1y, c2y);
return new MM.Transformation(x[0], x[1], x[2], y[0], y[1], y[2]);
};
// Solves a system of linear equations.
//
// t1 = (a * r1) + (b + s1) + c
// t2 = (a * r2) + (b + s2) + c
// t3 = (a * r3) + (b + s3) + c
//
// r1 - t3 are the known values.
// a, b, c are the unknowns to be solved.
// returns the a, b, c coefficients.
MM.linearSolution = function(r1, s1, t1, r2, s2, t2, r3, s3, t3) {
// make them all floats
r1 = parseFloat(r1);
s1 = parseFloat(s1);
t1 = parseFloat(t1);
r2 = parseFloat(r2);
s2 = parseFloat(s2);
t2 = parseFloat(t2);
r3 = parseFloat(r3);
s3 = parseFloat(s3);
t3 = parseFloat(t3);
var a = (((t2 - t3) * (s1 - s2)) - ((t1 - t2) * (s2 - s3))) /
(((r2 - r3) * (s1 - s2)) - ((r1 - r2) * (s2 - s3)));
var b = (((t2 - t3) * (r1 - r2)) - ((t1 - t2) * (r2 - r3))) /
(((s2 - s3) * (r1 - r2)) - ((s1 - s2) * (r2 - r3)));
var c = t1 - (r1 * a) - (s1 * b);
return [ a, b, c ];
};
// Projection
// ----------
// An abstract class / interface for projections
MM.Projection = function(zoom, transformation) {
if (!transformation) {
transformation = new MM.Transformation(1, 0, 0, 0, 1, 0);
}
this.zoom = zoom;
this.transformation = transformation;
};
MM.Projection.prototype = {
zoom: 0,
transformation: null,
rawProject: function(point) {
throw "Abstract method not implemented by subclass.";
},
rawUnproject: function(point) {
throw "Abstract method not implemented by subclass.";
},
project: function(point) {
point = this.rawProject(point);
if(this.transformation) {
point = this.transformation.transform(point);
}
return point;
},
unproject: function(point) {
if(this.transformation) {
point = this.transformation.untransform(point);
}
point = this.rawUnproject(point);
return point;
},
locationCoordinate: function(location) {
var point = new MM.Point(Math.PI * location.lon / 180.0,
Math.PI * location.lat / 180.0);
point = this.project(point);
return new MM.Coordinate(point.y, point.x, this.zoom);
},
coordinateLocation: function(coordinate) {
coordinate = coordinate.zoomTo(this.zoom);
var point = new MM.Point(coordinate.column, coordinate.row);
point = this.unproject(point);
return new MM.Location(180.0 * point.y / Math.PI,
180.0 * point.x / Math.PI);
}
};
// A projection for equilateral maps, based on longitude and latitude
MM.LinearProjection = function(zoom, transformation) {
MM.Projection.call(this, zoom, transformation);
};
// The Linear projection doesn't reproject points
MM.LinearProjection.prototype = {
rawProject: function(point) {
return new MM.Point(point.x, point.y);
},
rawUnproject: function(point) {
return new MM.Point(point.x, point.y);
}
};
MM.extend(MM.LinearProjection, MM.Projection);
MM.MercatorProjection = function(zoom, transformation) {
// super!
MM.Projection.call(this, zoom, transformation);
};
// Project lon/lat points into meters required for Mercator
MM.MercatorProjection.prototype = {
rawProject: function(point) {
return new MM.Point(point.x,
Math.log(Math.tan(0.25 * Math.PI + 0.5 * point.y)));
},
rawUnproject: function(point) {
return new MM.Point(point.x,
2 * Math.atan(Math.pow(Math.E, point.y)) - 0.5 * Math.PI);
}
};
MM.extend(MM.MercatorProjection, MM.Projection);
// Providers
// ---------
// Providers provide tile URLs and possibly elements for layers.
//
// MapProvider ->
// TemplatedMapProvider
//
MM.MapProvider = function(getTile) {
if (getTile) {
this.getTile = getTile;
}
};
MM.MapProvider.prototype = {
// these are limits for available *tiles*
// panning limits will be different (since you can wrap around columns)
// but if you put Infinity in here it will screw up sourceCoordinate
tileLimits: [
new MM.Coordinate(0,0,0), // top left outer
new MM.Coordinate(1,1,0).zoomTo(18) // bottom right inner
],
getTileUrl: function(coordinate) {
throw "Abstract method not implemented by subclass.";
},
getTile: function(coordinate) {
throw "Abstract method not implemented by subclass.";
},
// releaseTile is not required
releaseTile: function(element) { },
// use this to tell MapProvider that tiles only exist between certain zoom levels.
// should be set separately on Map to restrict interactive zoom/pan ranges
setZoomRange: function(minZoom, maxZoom) {
this.tileLimits[0] = this.tileLimits[0].zoomTo(minZoom);
this.tileLimits[1] = this.tileLimits[1].zoomTo(maxZoom);
},
// return null if coord is above/below row extents
// wrap column around the world if it's outside column extents
// ... you should override this function if you change the tile limits
// ... see enforce-limits in examples for details
sourceCoordinate: function(coord) {
var TL = this.tileLimits[0].zoomTo(coord.zoom),
BR = this.tileLimits[1].zoomTo(coord.zoom),
columnSize = Math.pow(2, coord.zoom),
wrappedColumn;
if (coord.column < 0) {
wrappedColumn = (coord.column + columnSize) % columnSize;
} else {
wrappedColumn = coord.column % columnSize;
}
if (coord.row < TL.row || coord.row >= BR.row) {
return null;
} else if (wrappedColumn < TL.column || wrappedColumn >= BR.column) {
return null;
} else {
return new MM.Coordinate(coord.row, wrappedColumn, coord.zoom);
}
}
};
/**
* FIXME: need a better explanation here! This is a pretty crucial part of
* understanding how to use ModestMaps.
*
* TemplatedMapProvider is a tile provider that generates tile URLs from a
* template string by replacing the following bits for each tile
* coordinate:
*
* {Z}: the tile's zoom level (from 1 to ~20)
* {X}: the tile's X, or column (from 0 to a very large number at higher
* zooms)
* {Y}: the tile's Y, or row (from 0 to a very large number at higher
* zooms)
*
* E.g.:
*
* var osm = new MM.TemplatedMapProvider("http://tile.openstreetmap.org/{Z}/{X}/{Y}.png");
*
* Or:
*
* var placeholder = new MM.TemplatedMapProvider("http://placehold.it/256/f0f/fff.png&text={Z}/{X}/{Y}");
*
*/
MM.TemplatedMapProvider = function(template, subdomains) {
var isQuadKey = template.match(/{(Q|quadkey)}/);
// replace Microsoft style substitution strings
if (isQuadKey) template = template
.replace('{subdomains}', '{S}')
.replace('{zoom}', '{Z}')
.replace('{quadkey}', '{Q}');
var hasSubdomains = (subdomains &&
subdomains.length && template.indexOf("{S}") >= 0);
var getTileUrl = function(coordinate) {
var coord = this.sourceCoordinate(coordinate);
if (!coord) {
return null;
}
var base = template;
if (hasSubdomains) {
var index = parseInt(coord.zoom + coord.row + coord.column, 10) %
subdomains.length;
base = base.replace('{S}', subdomains[index]);
}
if (isQuadKey) {
return base
.replace('{Z}', coord.zoom.toFixed(0))
.replace('{Q}', this.quadKey(coord.row,
coord.column,
coord.zoom));
} else {
return base
.replace('{Z}', coord.zoom.toFixed(0))
.replace('{X}', coord.column.toFixed(0))
.replace('{Y}', coord.row.toFixed(0));
}
};
MM.MapProvider.call(this, getTileUrl);
};
MM.TemplatedMapProvider.prototype = {
// quadKey generator
quadKey: function(row, column, zoom) {
var key = '';
for (var i = 1; i <= zoom; i++) {
key += (((row >> zoom - i) & 1) << 1) | ((column >> zoom - i) & 1);
}
return key || '0';
},
getTile: function(coord) {
return this.getTileUrl(coord);
}
};
MM.extend(MM.TemplatedMapProvider, MM.MapProvider);
MM.TemplatedLayer = function(template, subdomains) {
return new MM.Layer(new MM.TemplatedMapProvider(template, subdomains));
};
// Event Handlers
// --------------
// A utility function for finding the offset of the
// mouse from the top-left of the page
MM.getMousePoint = function(e, map) {
// start with just the mouse (x, y)
var point = new MM.Point(e.clientX, e.clientY);
// correct for scrolled document
point.x += document.body.scrollLeft + document.documentElement.scrollLeft;
point.y += document.body.scrollTop + document.documentElement.scrollTop;
// correct for nested offsets in DOM
for (var node = map.parent; node; node = node.offsetParent) {
point.x -= node.offsetLeft;
point.y -= node.offsetTop;
}
return point;
};
// A handler that allows mouse-wheel zooming - zooming in
// when page would scroll up, and out when the page would scroll down.
MM.MouseWheelHandler = function(map, precise) {
// only init() if we get a map
if (map) {
this.init(map, precise);
// allow (null, true) as constructor args
} else if (arguments.length > 1) {
this.precise = precise ? true : false;
}
};
MM.MouseWheelHandler.prototype = {
precise: false,
init: function(map) {
this.map = map;
this._mouseWheel = MM.bind(this.mouseWheel, this);
this._zoomDiv = document.body.appendChild(document.createElement('div'));
this._zoomDiv.style.cssText = 'visibility:hidden;top:0;height:0;width:0;overflow-y:scroll';
var innerDiv = this._zoomDiv.appendChild(document.createElement('div'));
innerDiv.style.height = '2000px';
MM.addEvent(map.parent, 'mousewheel', this._mouseWheel);
},
remove: function() {
MM.removeEvent(this.map.parent, 'mousewheel', this._mouseWheel);
this._zoomDiv.parentNode.removeChild(this._zoomDiv);
},
mouseWheel: function(e) {
var delta = 0;
this.prevTime = this.prevTime || new Date().getTime();
try {
this._zoomDiv.scrollTop = 1000;
this._zoomDiv.dispatchEvent(e);
delta = 1000 - this._zoomDiv.scrollTop;
} catch (error) {
delta = e.wheelDelta || (-e.detail * 5);
}
// limit mousewheeling to once every 200ms
var timeSince = new Date().getTime() - this.prevTime;
if (Math.abs(delta) > 0 && (timeSince > 200) && !this.precise) {
var point = MM.getMousePoint(e, this.map);
this.map.zoomByAbout(delta > 0 ? 1 : -1, point);
this.prevTime = new Date().getTime();
} else if (this.precise) {
var point = MM.getMousePoint(e, this.map);
this.map.zoomByAbout(delta * 0.001, point);
}
// Cancel the event so that the page doesn't scroll
return MM.cancelEvent(e);
}
};
// Handle double clicks, that zoom the map in one zoom level.
MM.DoubleClickHandler = function(map) {
if (map !== undefined) {
this.init(map);
}
};
MM.DoubleClickHandler.prototype = {
init: function(map) {
this.map = map;
this._doubleClick = MM.bind(this.doubleClick, this);
MM.addEvent(map.parent, 'dblclick', this._doubleClick);
},
remove: function() {
MM.removeEvent(this.map.parent, 'dblclick', this._doubleClick);
},
doubleClick: function(e) {
// Ensure that this handler is attached once.
// Get the point on the map that was double-clicked
var point = MM.getMousePoint(e, this.map);
// use shift-double-click to zoom out
this.map.zoomByAbout(e.shiftKey ? -1 : 1, point);
return MM.cancelEvent(e);
}
};
// Handle the use of mouse dragging to pan the map.
MM.DragHandler = function(map) {
if (map !== undefined) {
this.init(map);
}
};
MM.DragHandler.prototype = {
init: function(map) {
this.map = map;
this._mouseDown = MM.bind(this.mouseDown, this);
MM.addEvent(map.parent, 'mousedown', this._mouseDown);
},
remove: function() {
MM.removeEvent(this.map.parent, 'mousedown', this._mouseDown);
},
mouseDown: function(e) {
MM.addEvent(document, 'mouseup', this._mouseUp = MM.bind(this.mouseUp, this));