267 lines
7.8 KiB
JavaScript
267 lines
7.8 KiB
JavaScript
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window.requestAnimFrame = (function(){
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return window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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window.oRequestAnimationFrame ||
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window.msRequestAnimationFrame ||
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function( callback ){
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window.setTimeout(callback, 1000 / 60);
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};
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})();
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function Event() {}
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Event.prototype.on = function(evt, callback) {
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var cb = this.callbacks = this.callbacks || {};
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var l = cb[evt] || (cb[evt] = []);
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l.push(callback);
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};
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Event.prototype.emit = function(evt) {
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var c = this.callbacks && this.callbacks[evt];
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for(var i = 0; c && i < c.length; ++i) {
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c[i].apply(this, Array.prototype.slice.call(arguments, 1));
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}
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};
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function MapModel(opts) {
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opts = opts || {};
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this.projection = new MercatorProjection();
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this.setCenter(opts.center || new LatLng(0,0));
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this.setZoom(opts.zoom || 1);
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}
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MapModel.prototype = new Event();
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MapModel.prototype.setCenter = function(center) {
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this.center = new LatLng(center.lat, center.lng);
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this.center_pixel = this.projection.fromLatLngToPixel(this.center, this.zoom).floor();
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this.emit('center_changed', this.center);
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};
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MapModel.prototype.setZoom = function(zoom) {
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this.zoom = zoom;
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this.center_pixel = this.projection.fromLatLngToPixel(this.center, this.zoom).floor();
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this.emit('zoom_changed', this.center);
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};
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MapModel.prototype.getCenterPixel = function() {
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var center_point = this.projection.fromLatLngToPixel(this.center, this.zoom);
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return center_point;
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}
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MapModel.prototype.getTopLeft = function(width, height) {
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var center_point = this.projection.fromLatLngToPixel(this.center, this.zoom);
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var widthHalf = width / 2;
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var heightHalf = height / 2;
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center_point.x -= widthHalf;
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center_point.y -= heightHalf;
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return center_point;
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}
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MapModel.prototype.getBBox = function(width, height) {
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var center_point = this.projection.fromLatLngToPixel(this.center, this.zoom);
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var widthHalf = width / 2;
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var heightHalf = height / 2;
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center_point.x -= widthHalf;
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center_point.y += heightHalf;
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var bottomleft = this.projection.fromPixelToLatLng(center_point, this.zoom);
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center_point.x += width;
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center_point.y -= height;
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var topRight = this.projection.fromPixelToLatLng(center_point, this.zoom);
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return [bottomleft, topRight]
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}
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/**
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* return a list of tiles inside the spcified zone
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* the center will be placed on the center of that zone
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*/
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MapModel.prototype.visibleTiles = function(width, height) {
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var self = this;
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var widthHalf = width / 2;
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var heightHalf = height / 2;
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var center_point = self.projection.fromLatLngToPixel(self.center, self.zoom);
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center_point.x -= widthHalf;
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center_point.y -= heightHalf;
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var tile = this.projection.pixelToTile(center_point, self.zoom);
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var offset_x = center_point.x%this.projection.TILE_SIZE;
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var offset_y = center_point.y%this.projection.TILE_SIZE;
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var num_tiles_x = Math.ceil((width + offset_x)/this.projection.TILE_SIZE);
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var num_tiles_y = Math.ceil((height + offset_y)/this.projection.TILE_SIZE);
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var tiles = [];
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for(var i = 0; i < num_tiles_x; ++i) {
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for(var j = 0; j < num_tiles_y; ++j) {
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var tile_x = tile.x + i;
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var tile_y = tile.y + j;
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tiles.push({
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x: tile_x * this.projection.TILE_SIZE,
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y: tile_y * this.projection.TILE_SIZE,
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zoom: self.zoom,
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i: tile_x,
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j: tile_y
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});
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}
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}
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return tiles;
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}
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function dragger(el) {
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var self = this;
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var dragging = false;
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var x, y;
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el.ontouchstart = el.onmousedown = function(e) {
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dragging = true;
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if (e.touches) {
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var p = e.touches[0];
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x = p.pageX;
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y = p.pageY;
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} else {
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x = e.clientX;
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y = e.clientY;
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}
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self.emit('startdrag', x, y);
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};
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el.ontouchmove = el.onmousemove = function(e) {
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var xx, yy;
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if(!dragging) return;
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if (e.touches) {
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var p = e.touches[0];
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xx = p.pageX;
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yy = p.pageY;
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} else {
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xx = e.clientX;
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yy = e.clientY;
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}
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self.emit('move', xx - x, yy - y);
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return false;
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};
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el.ontouchend = el.onmouseup = function(e) {
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dragging = false;
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self.emit('enddrag', x, y);
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};
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}
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dragger.prototype = new Event();
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function CanvasRenderer(el, map) {
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var self = this;
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this.el = el;
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this.tiles = {};
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this.width = el.offsetWidth >> 0;
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this.height = el.offsetHeight >> 0;
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var widthHalf = (this.width / 2) >> 0;
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var heightHalf = (this.height / 2) >> 0;
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var canvas = this.canvas = document.createElement('canvas');
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canvas.style.padding = '0';
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canvas.style.margin= '0';
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canvas.style.position = 'absolute';
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canvas.width = this.width;
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canvas.height = this.height;
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var context = canvas.getContext( '2d' );
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context.translate( widthHalf, heightHalf );
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this.context = context;
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var div = document.createElement('div');
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div.style.width = this.width + "px";
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div.style.height= this.height + "px";
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div.style.position = 'relative';
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div.appendChild(canvas);
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el.appendChild(div);
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this.center_init = null;
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this.target_center = new LatLng();
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this.drag = new dragger(div);
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this.drag.on('startdrag', function() {
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self.center_init = map.center.clone();
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});
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this.drag.on('enddrag', function() {
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map.emit('end_move');
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});
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function go_to_target() {
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var c = map.center;
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var t = self.target_center;
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var dlat = t.lat - c.lat;
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var dlon = t.lng - c.lng;
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t.lat += dlat*0.0001;
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t.lng += dlon*0.0001;
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map.setCenter(t);
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if(Math.abs(dlat) + Math.abs(dlon) > 0.001) {
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requestAnimFrame(go_to_target);
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} else {
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//map.emit('end_move');
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}
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}
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this.drag.on('move', function(dx, dy) {
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var t = 1 << map.zoom;
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var s = 1/t;
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s = s/map.projection.pixelsPerLonDegree_;
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self.target_center.lat = self.center_init.lat + dy*s;
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self.target_center.lng = self.center_init.lng - dx*s;
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requestAnimFrame(go_to_target);
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});
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}
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CanvasRenderer.prototype.renderTile = function(tile, at) {
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var self = this;
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var key = at.x + '_' + at.y
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if(a=self.tiles[key]) {
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self.context.drawImage(a, at.x, at.y);
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return;
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}
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//var layer = 'http://a.tile.cloudmade.com/BC9A493B41014CAABB98F0471D759707/997/256/{{z}}/{{x}}/{{y}}.png';
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var layer = 'http://b.tiles.mapbox.com/v3/mapbox.mapbox-light/{{z}}/{{x}}/{{y}}.png64';
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var url = layer.replace('{{z}}', tile.zoom).replace('{{x}}', tile.i).replace('{{y}}', tile.j);
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var img = new Image();
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img.src = url;
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img.onload = function() {
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self.context.drawImage(img, at.x, at.y);
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self.tiles[key] = img;
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};
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}
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CanvasRenderer.prototype.renderTiles = function(tiles, center) {
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for(var i = 0; i < tiles.length; ++i) {
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var tile = tiles[i];
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var p = new Point(tile.x, tile.y);
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p.x -= center.x;
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p.y -= center.y;
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this.renderTile(tile, p);
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}
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}
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function Map(el, opts) {
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opts = opts || {};
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var self = this;
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this.model = new MapModel({
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center: opts.center || new LatLng(41.69, -4.83),
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zoom: opts.zoom || 1
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});
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this.view = new CanvasRenderer(el, this.model);
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/*function render() {
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var tiles = self.model.visibleTiles(self.view.width, self.view.height);
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self.view.renderTiles(tiles, this.center_pixel);
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}
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this.model.on('center_changed', render);
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this.model.on('zoom_changed', render);
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this.model.emit('center_changed');
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*/
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}
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