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mapmote.js
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mapmote.js
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(function() {
var SphericalMercator = (function(){
// Closures including constants and other precalculated values.
var cache = {},
EPSLN = 1.0e-10,
D2R = Math.PI / 180,
R2D = 180 / Math.PI,
// 900913 properties.
A = 6378137,
MAXEXTENT = 20037508.34;
// SphericalMercator constructor: precaches calculations
// for fast tile lookups.
function SphericalMercator(options) {
options = options || {};
this.size = options.size || 256;
if (!cache[this.size]) {
var size = this.size;
var c = cache[this.size] = {};
c.Bc = [];
c.Cc = [];
c.zc = [];
c.Ac = [];
for (var d = 0; d < 30; d++) {
c.Bc.push(size / 360);
c.Cc.push(size / (2 * Math.PI));
c.zc.push(size / 2);
c.Ac.push(size);
size *= 2;
}
}
this.Bc = cache[this.size].Bc;
this.Cc = cache[this.size].Cc;
this.zc = cache[this.size].zc;
this.Ac = cache[this.size].Ac;
}
// Convert lon lat to screen pixel value
//
// - `ll` {Array} `[lon, lat]` array of geographic coordinates.
// - `zoom` {Number} zoom level.
SphericalMercator.prototype.px = function(ll, zoom) {
var d = this.zc[zoom];
var f = Math.min(Math.max(Math.sin(D2R * ll[1]), -0.9999), 0.9999);
var x = Math.round(d + ll[0] * this.Bc[zoom]);
var y = Math.round(d + 0.5 * Math.log((1 + f) / (1 - f)) * (-this.Cc[zoom]));
(x > this.Ac[zoom]) && (x = this.Ac[zoom]);
(y > this.Ac[zoom]) && (y = this.Ac[zoom]);
//(x < 0) && (x = 0);
//(y < 0) && (y = 0);
return [x, y];
};
// Convert screen pixel value to lon lat
//
// - `px` {Array} `[x, y]` array of geographic coordinates.
// - `zoom` {Number} zoom level.
SphericalMercator.prototype.ll = function(px, zoom) {
var g = (px[1] - this.zc[zoom]) / (-this.Cc[zoom]);
var lon = (px[0] - this.zc[zoom]) / this.Bc[zoom];
var lat = R2D * (2 * Math.atan(Math.exp(g)) - 0.5 * Math.PI);
return [lon, lat];
};
// Convert tile xyz value to bbox of the form `[w, s, e, n]`
//
// - `x` {Number} x (longitude) number.
// - `y` {Number} y (latitude) number.
// - `zoom` {Number} zoom.
// - `tms_style` {Boolean} whether to compute using tms-style.
// - `srs` {String} projection for resulting bbox (WGS84|900913).
// - `return` {Array} bbox array of values in form `[w, s, e, n]`.
SphericalMercator.prototype.bbox = function(x, y, zoom, tms_style, srs) {
// Convert xyz into bbox with srs WGS84
if (tms_style) {
y = (Math.pow(2, zoom) - 1) - y;
}
// Use +y to make sure it's a number to avoid inadvertent concatenation.
var ll = [x * this.size, (+y + 1) * this.size]; // lower left
// Use +x to make sure it's a number to avoid inadvertent concatenation.
var ur = [(+x + 1) * this.size, y * this.size]; // upper right
var bbox = this.ll(ll, zoom).concat(this.ll(ur, zoom));
// If web mercator requested reproject to 900913.
if (srs === '900913') {
return this.convert(bbox, '900913');
} else {
return bbox;
}
};
// Convert bbox to xyx bounds
//
// - `bbox` {Number} bbox in the form `[w, s, e, n]`.
// - `zoom` {Number} zoom.
// - `tms_style` {Boolean} whether to compute using tms-style.
// - `srs` {String} projection of input bbox (WGS84|900913).
// - `@return` {Object} XYZ bounds containing minX, maxX, minY, maxY properties.
SphericalMercator.prototype.xyz = function(bbox, zoom, tms_style, srs) {
// If web mercator provided reproject to WGS84.
if (srs === '900913') {
bbox = this.convert(bbox, 'WGS84');
}
var ll = [bbox[0], bbox[1]]; // lower left
var ur = [bbox[2], bbox[3]]; // upper right
var px_ll = this.px(ll, zoom);
var px_ur = this.px(ur, zoom);
// Y = 0 for XYZ is the top hence minY uses px_ur[1].
var bounds = {
minX: Math.floor(px_ll[0] / this.size),
minY: Math.floor(px_ur[1] / this.size),
maxX: Math.floor((px_ur[0] - 1) / this.size),
maxY: Math.floor((px_ll[1] - 1) / this.size)
};
if (tms_style) {
var tms = {
minY: (Math.pow(2, zoom) - 1) - bounds.maxY,
maxY: (Math.pow(2, zoom) - 1) - bounds.minY
};
bounds.minY = tms.minY;
bounds.maxY = tms.maxY;
}
return bounds;
};
// Convert projection of given bbox.
//
// - `bbox` {Number} bbox in the form `[w, s, e, n]`.
// - `to` {String} projection of output bbox (WGS84|900913). Input bbox
// assumed to be the "other" projection.
// - `@return` {Object} bbox with reprojected coordinates.
SphericalMercator.prototype.convert = function(bbox, to) {
if (to === '900913') {
return this.forward(bbox.slice(0, 2)).concat(this.forward(bbox.slice(2,4)));
} else {
return this.inverse(bbox.slice(0, 2)).concat(this.inverse(bbox.slice(2,4)));
}
};
// Convert lon/lat values to 900913 x/y.
SphericalMercator.prototype.forward = function(ll) {
var xy = [
A * ll[0] * D2R,
A * Math.log(Math.tan((Math.PI*0.25) + (0.5 * ll[1] * D2R)))
];
// if xy value is beyond maxextent (e.g. poles), return maxextent.
(xy[0] > MAXEXTENT) && (xy[0] = MAXEXTENT);
(xy[0] < -MAXEXTENT) && (xy[0] = -MAXEXTENT);
(xy[1] > MAXEXTENT) && (xy[1] = MAXEXTENT);
(xy[1] < -MAXEXTENT) && (xy[1] = -MAXEXTENT);
return xy;
};
// Convert 900913 x/y values to lon/lat.
SphericalMercator.prototype.inverse = function(xy) {
return [
(xy[0] * R2D / A),
((Math.PI*0.5) - 2.0 * Math.atan(Math.exp(-xy[1] / A))) * R2D
];
};
return SphericalMercator;
})();
if (typeof module !== 'undefined' && typeof exports !== 'undefined') {
module.exports = exports = SphericalMercator;
}
function guessTiles() {
var tile_images;
tile_images = document.getElementsByClassName('map-tile-loaded');
if (!tile_images.length) {
tile_images = document.getElementsByClassName('leaflet-tile');
if (!tile_images.length) {
tile_images = document.getElementsByClassName('olTileImage');
if (!tile_images.length) {
tile_images = document.getElementsByTagName('img');
}}}
if (!tile_images.length) return alert('No images found on this page');
var coordinates = [];
for (var i = 0; i < tile_images.length; i++) {
var img = tile_images[i];
if (img.getAttribute('src')) {
var coord = [];
console.log(img.getAttribute('src'));
coord = img.getAttribute('src').match(/(\d+)\/(\d+)\/(\d+)/);
if (!coord || !coord.length) {
// google.
var s = img.getAttribute('src');
var x = s.match(/x=(\d+)/),
y = s.match(/y=(\d+)/),
z = s.match(/z=(\d+)/);
if (x && y && z) coord = [0, z[1], x[1], y[1]];
}
if (coord && coord.length) coordinates.push({
z: +coord[1],
x: +coord[2],
y: +coord[3]
});
}
}
if (!coordinates.length) return alert('No tiles found on this page');
if (coordinates.length) coordsToLL(coordinates);
}
function union(cs) {
var minx = Infinity, miny = Infinity, maxx = -Infinity, maxy = -Infinity;
for (var i = 0; i < cs.length; i++) {
if (cs[i][0] < minx) minx = cs[i][0];
if (cs[i][1] < miny) miny = cs[i][1];
if (cs[i][2] > maxx) maxx = cs[i][2];
if (cs[i][3] > maxy) maxy = cs[i][3];
}
return [minx, miny, maxx, maxy];
}
function loadZoom(bb) {
var ifr = document.body.appendChild(document.createElement('iframe'));
ifr.style.width = '0px';
ifr.style.height = '0px';
var p = 12;
if ((bb[2] - bb[0]) > 0.01) {
var c = (bb[0] + bb[2]) / 2;
bb[0] = c - 0.005;
bb[2] = c + 0.005;
}
if ((bb[3] - bb[1]) > 0.01) {
var d = (bb[3] + bb[1]) / 2;
bb[1] = d - 0.005;
bb[3] = d + 0.005;
}
ifr.setAttribute('src',
'http://127.0.0.1:8111/load_and_zoom' +
'?left=' + bb[0].toFixed(p) +
'&top=' + bb[3].toFixed(p) +
'&right=' + bb[2].toFixed(p) +
'&bottom=' + bb[1].toFixed(p));
}
function coordsToLL(cs) {
var s = new SphericalMercator();
var zoom = cs[0].z;
var bboxes = [];
for (var i = 0; i < cs.length; i++) {
if (cs[i].z !== zoom) continue;
bboxes.push(s.bbox(cs[i].x, cs[i].y, cs[i].z));
}
if (bboxes.length) loadZoom(union(bboxes));
}
guessTiles();
})();