+++ /dev/null
-// June 20th 2005 http://civicactions.net anselm@hook.org public domain version 0.5
-
-//
-// miscellaneous
-//
-
-var netscape = ( document.getElementById && !document.all ) || document.layers;
-var defaultEngine = null; // xxx for firefox keyboard events.
-
-var PI = 3.14159265358979323846;
-
-var lat_range = PI, lon_range = PI;
-
-//
-// Utility - get div position - may not be accurate
-//
-
-function getCSSPositionX(parent)
-{
- var offset = parent.x ? parseInt(parent.x) : 0;
- offset += parent.style.left ? parseInt(parent.style.left) : 0;
- for(var node = parent; node ; node = node.offsetParent )
- {
- offset += node.offsetLeft;
- }
- return offset;
-}
-
-function getCSSPositionY(parent)
-{
- var offset = parent.y ? parseInt(parent.y) : 0;
- offset += parent.style.top ? parseInt(parent.style.top) : 0;
- for(var node = parent; node ; node = node.offsetParent )
- {
- offset += node.offsetTop;
- }
- return offset;
-}
-
-///
-/// initialize a new tile engine object
-/// usage: var engine = new tile_engine_new(parentdiv,stylehints,wmssource,lon,lat,zoom,optional width, optional height)
-///
-function tile_engine_new(parentname,hints,feedurl,url,lon,lat,zoom,w,h)
-{
- // NW geocoder removed for now
-
- this.timestamp = new Date().getTime();
- this.urlAttr = new Array();
-
- // NW Removed navigation buttons entirely for flexibility
-
- this.lonPerPixel = function()
- { return (this.lon_quant/this.scale)/this.tilewidth; }
-
- this.latPerPixel = function()
- { return (this.lat_quant/this.scale)/this.tileheight; }
-
- this.xToLon = function(x)
- { return this.lon + (x-this.thewidth/2)*this.lonPerPixel(); }
-
- this.yToLat = function(y)
- { return normallat(this.lat - (y-this.theheight/2)
- *this.latPerPixel()); }
-
- this.lonToX = function (lon)
- { return ((lon-this.lon)/this.lonPerPixel()) + this.thewidth/2;}
-
- this.latToY = function(lat)
- { return ((this.lat-mercatorlat(lat))/this.latPerPixel()) +
- this.theheight/2; }
-
-
- //
- // it is possible that this collection is already in use - clean it
- //
- this.clean = function()
- {
- /*
- while( this.parent.hasChildNodes() )
- this.parent.removeChild( this.parent.firstChild );
- */
-
- for(var ct=0; ct<this.parent.childNodes.length; ct++)
- {
- if(this.parent.childNodes[ct].id != "controls")
- this.parent.removeChild(this.parent.childNodes[ct]);
- }
-
- //
- // build inner tile container for theoretical speed improvement?
- // center in parent for simplicity of math
- // size of inner container is irrelevant since overflow is enabled
- //
-
- if( this.dragcontainer )
- {
- this.tiles = document.createElement('div');
- this.tiles.style.position = 'absolute';
- this.tiles.style.left = this.displaywidth/2 + 'px';
- this.tiles.style.top = this.displayheight/2 + 'px';
- this.tiles.style.width = '16px';
- this.tiles.style.height = '16px';
- if( this.debug )
- {
- this.tiles.style.border = 'dashed green 1px';
- }
- this.tiles.tile_engine = this;
- this.parent.appendChild(this.tiles);
-
- }
- else
- {
- this.tiles = this.parent;
- }
- }
-
- /// focus over specified lon/lat and zoom
- /// user should call this.drag(0,0) after this to force an initial refresh
- ///
-
- this.performzoom = function(lon,lat,z)
- {
- // setup for zoom
- // this engine operates at * scale to try avoid tile errors thrashing
- // server cache
-
- this.scale = 1000000;
- this.lon_min_clamp = -180 * this.scale;
- this.lon_max_clamp = 180 * this.scale;
- this.lat_min_clamp = -180 * this.scale; //t
- this.lat_max_clamp = 180 * this.scale; //t
- this.lon_start_tile = 180 * this.scale;
- this.lat_start_tile = 90 * this.scale; //t
- this.zoom_power = 2;
- this.lon_quant = this.lon_start_tile;
- this.lat_quant = this.lat_start_tile;
- this.lon = lon;
- this.lat = lat;
-
- // operational lat - = lat due to quirks in our engine and quirks in o
- // lon/lat design
- lat = -lat;
-
- // divide tile size until reach requested zoom
- // trying to guarantee consistency so as to not thrash the server side tile cache
- while(z > 0)
- {
- this.lon_quant = this.lon_quant / this.zoom_power;
- this.lat_quant = this.lat_quant / this.zoom_power;
- z--;
- }
- this.lon_quant = Math.round( this.lon_quant );
- this.lat_quant = Math.round( this.lat_quant );
-
- // get user requested exact lon/lat
- this.lon_scaled = Math.round( lon * this.scale );
- this.lat_scaled = Math.round( lat * this.scale );
-
-
-
- // convert requested exact lon/lat to quantized lon lat (rounding down
- // or up as best suits)
- this.lon_round = Math.round( this.lon_scaled / this.lon_quant ) *
- this.lon_quant;
- this.lat_round = Math.round( this.lat_scaled / this.lat_quant ) *
- this.lat_quant;
-
- //alert('lon_round=' + this.lon_round+ ' lat_round='+this.lat_round);
-
- // calculate world extents [ this is the span of all tiles in lon/lat ]
- this.lon_min = this.lon_round - this.lon_quant;
- this.lon_max = this.lon_round + this.lon_quant;
- this.lat_min = this.lat_round - this.lat_quant;
- this.lat_max = this.lat_round + this.lat_quant;
-
- // set tiled region details [ this is the span of all tiles in pixels ]
- this.centerx = 0;
- this.centery = 0;
- this.tilewidth = 256;
- this.tileheight = 128;
- this.left = -this.tilewidth;
- this.right = this.tilewidth;
- this.top = -this.tileheight;
- this.bot = this.tileheight;
-
-
- // adjust the current center position slightly to reflect exact lat/lon
- // not rounded
- this.centerx -= (this.lon_scaled-this.lon_round)/
- (this.lon_max-this.lon_min)*(this.right-this.left);
- this.centery -= (this.lat_scaled-this.lat_round)/
- (this.lat_max-this.lat_min)*(this.bot-this.top);
- }
-
- this.update_perma_link = function() {
- // because we're using mercator
- updatelinks(this.lon,normallat(this.lat),this.zoom);
- }
-
- ///
- /// draw the spanning lon/lat range
- /// drag is simply the mouse delta in pixels
- ///
-
- this.drag = function(dragx,dragy)
- {
- var fred=true;
-
- // move the drag offset
- this.centerx += dragx;
- this.centery += dragy;
-
- // update where we think the user is actually focused
- this.lon = ( this.lon_round - ( this.lon_max - this.lon_min ) /
- ( this.right - this.left ) * this.centerx ) / this.scale;
- this.lat = - ( this.lat_round - ( this.lat_max - this.lat_min ) /
- ( this.bot - this.top ) * this.centery ) / this.scale;
-
- this.update_perma_link();
-
- // show it
- var helper = this.navhelp;
-
- // extend exposed sections
- var dirty = false;
- while( this.left + this.centerx > -this.displaywidth/2 &&
- this.lon_min > this.lon_min_clamp )
- {
- this.left -= this.tilewidth;
- this.lon_min -= this.lon_quant;
- dirty = true;
- }
- while( this.right + this.centerx < this.displaywidth/2 &&
- this.lon_max < this.lon_max_clamp )
- {
- this.right += this.tilewidth;
- this.lon_max += this.lon_quant;
- dirty = true;
- }
- while( this.top + this.centery > -this.displayheight/2 &&
- this.lat_min > this.lat_min_clamp )
- {
- this.top -= this.tileheight;
- this.lat_min -= this.lat_quant;
- dirty = true;
- }
-
- while( this.bot + this.centery < this.displayheight/2 &&
- this.lat_max < this.lat_max_clamp )
- {
- this.bot += this.tileheight;
- this.lat_max += this.lat_quant;
- dirty = true;
- }
-
-
- // prepare to walk the container and assure that all nodes are correct
- var containerx;
- var containery;
-
- // in drag container mode we do not have to move the children all the
- // time
- if( this.dragcontainer )
- {
- this.tiles.style.left = this.displaywidth / 2 + this.centerx + 'px';
- this.tiles.style.top = this.displayheight / 2 + this.centery + 'px';
- if( !dirty && this.tiles.hasChildNodes() )
- {
- return;
- }
- containerx = this.left;
- containery = this.top;
- }
- else
- {
- containerx = this.left + this.centerx;
- containery = this.top + this.centery;
- }
-
- // walk all tiles and repair as needed
- // xxx one bug is that it walks the _entire_ width and height...
- // not just visible.
- // xxx this makes cleanup harder and perhaps a bitmap is better
-
- var removehidden = 1;
- var removecolumn = 0;
- var removerow = 0;
- var containeryreset = containery;
-
- for( var x = this.lon_min; x < this.lon_max ; x+= this.lon_quant )
- {
- // will this row be visible in the next round?
- if( removehidden )
- {
- var rx = containerx + this.centerx;
- if( rx > this.displaywidth / 2 )
- {
- removerow = 1;
- // ideally i would truncate max width here
- }
- else if( rx + this.tilewidth < - this.displaywidth / 2 )
- {
- removerow = 1;
- }
- else
- {
- removerow = 0;
- }
- }
-
- for( var y = this.lat_min; y < this.lat_max ; y+= this.lat_quant )
- {
- // is this column visible?
- if( removehidden )
- {
- var ry = containery + this.centery;
- if( ry > this.displayheight / 2 )
- {
- removecolumn = 1;
- }
- else if( ry + this.tileheight < - this.displayheight/2)
- {
- removecolumn = 1;
- }
- else
- {
- removecolumn = 0;
- }
- }
-
- // convert to WMS compliant coordinate system
- var lt = x / this.scale;
- var rt = lt + this.lon_quant / this.scale;
- var tp = y / this.scale;
- var bt = tp + this.lat_quant / this.scale;
- var temp = bt;
- var bt = -tp;
- var tp = -temp;
-
- // modify for mercator-projected tiles:
- tp = 180/PI * (2 * Math.atan(Math.exp(tp * PI / 180)) - PI / 2);
- bt = 180/PI * (2 * Math.atan(Math.exp(bt * PI / 180)) - PI / 2);
-
- // make a key
- var key = this.url + "?WIDTH="+(this.tilewidth)+"&HEIGHT="+
- (this.tileheight)+"&BBOX="+lt+","+tp+","+rt+","+bt;
-
- // see if our tile is already present
- var node = document.getElementById(key);
-
- // create if not present
- if(!node)
- {
- if( this.debug > 0)
- {
- node = document.createElement('div');
- }
- else
- {
- node = document.createElement('img');
- }
- node.id = key;
- node.className = 'tile';
- node.style.position = 'absolute';
- node.style.width = this.tilewidth + 'px';
- node.style.height = this.tileheight + 'px';
- node.style.left = containerx + 'px';
- node.style.top = containery + 'px';
- node.style.zIndex = 10; // to appear under the rss elements
- node.tile_engine = this;
- if( this.debug > 0)
- {
- node.style.border = "1px solid yellow";
- node.innerHTML = key;
- if( this.debug > 1 )
- {
- var img = document.createElement('img');
- img.src = key;
- node.appendChild(img);
- }
- }
-
- var goURL = key + "&zoom=" + this.zoom;
-
- for(var k in this.urlAttr)
- {
- goURL += "&"+k+"="+this.urlAttr[k];
- }
-
- node.src = goURL;
-
- node.alt = "loading tile..";
- node.style.color = "#ffffff";
- this.tiles.appendChild(node);
- }
- // adjust if using active style
- else if( !this.dragcontainer ) {
- node.style.left = containerx + 'px';
- node.style.top = containery + 'px';
- }
-
- containery += this.tileheight;
- }
- containery = containeryreset;
- containerx += this.tilewidth;
- }
- }
-
- this.zoomTo = function(zoom)
- {
-
- this.zoom = zoom;
-
- if (this.zoom < this.minzoom) { this.zoom = this.minzoom; }
- if (this.zoom > this.maxzoom) { this.zoom = this.maxzoom; }
-
-
-
-
- ///
- /// immediately draw and or fit to feed
- ///
- this.performzoom(this.lon,this.lat,zoom);
- this.drag(0,0);
-
- ///
- } // CLOSE ZOOM FUNCTION
-
- this.setLatLon = function(lat,lon)
- {
- this.lon=lon;
- this.lat=mercatorlat(lat);
- this.clean();
- this.performzoom(lon,mercatorlat(lat),this.zoom);
- this.drag(0,0);
- }
-
- this.forceRefresh = function()
- {
- this.clean();
- this.performzoom(this.lon,this.lat,this.zoom);
- this.drag(0,0);
- }
-
- ///
- /// zoom a tile group
- ///
- this.tile_engine_zoomout = function()
- {
- this.clean();
- this.zoomTo(this.zoom-1);
-
- return false; // or safari falls over
- }
-
- ///
- /// zoom a tile group
- ///
- this.tile_engine_zoomin = function()
- {
-
- this.clean();
- this.zoomTo(this.zoom+1);
-
- return false; // or safari falls over
- }
-
- this.setURL=function(url) { this.url=url; }
-
-
-
- ///
- /// intercept context events to minimize out-of-browser interruptions
- ///
-
- this.event_context = function(e)
- {
- return false;
- }
-
- ///
- /// keys
- ///
-
- this.event_key = function(e)
- {
- var key = 0;
-
- var hostengine = defaultEngine;
-
- if( window && window.event && window.event.srcElement ) {
- hostengine = window.event.srcElement.tile_engine;
- } else if( e.target ) {
- hostengine = e.target.tile_engine;
- } else if( e.srcElement ) {
- hostengine = e.srcElement.tile_engine;
- }
-
- if( hostengine == null ) {
- hostengine = defaultEngine;
- if( hostengine == null ) {
- return;
- }
- }
-
-
- if( e == null && document.all ) {
- e = window.event;
- }
-
- if( e ) {
- if( e.keyCode ) {
- key = e.keyCode;
- }
- else if( e.which ) {
- key = e.which;
- }
-
- switch(key) {
- case 97: // a = left
- hostengine.drag(16,0);
- break;
- case 100: // d = right
- hostengine.drag(-16,0);
- break;
- case 119: // w = up
- hostengine.drag(0,16);
- break;
- case 120: // x = dn
- hostengine.drag(0,-16);
- break;
- case 115: // s = center
- new tile_engine_new(hostengine.parentname,
- "FULL",
- hostengine.feedurl, // xxx hrm, cache this?
- hostengine.url,
- hostengine.lon,
- hostengine.lat,
- hostengine.zoom,
- 0,0
- );
- break;
- case 122: // z = zoom
- new tile_engine_new(hostengine.parentname,
- "FULL",
- hostengine.feedurl, // xxx hrm, cache this?
- hostengine.url,
- hostengine.lon,
- hostengine.lat,
- hostengine.zoom + 1,
- 0,0
- );
- break;
- case 99: // c = unzoom
- new tile_engine_new(hostengine.parentname,
- "FULL",
- hostengine.feedurl, // xxx hrm, cache this?
- hostengine.url,
- hostengine.lon,
- hostengine.lat,
- hostengine.zoom - 1,
- 0,0
- );
- break;
- }
- }
- }
-
- ///
- /// catch mouse move events
- /// this routine _must_ return false or else the operating system outside-of-browser-scope drag and drop handler will interfere
- ///
-
- this.event_mouse_move = function(e) {
-
- var hostengine = null;
- if( window && window.event && window.event.srcElement ) {
- hostengine = window.event.srcElement.tile_engine;
- } else if( e.target ) {
- hostengine = e.target.tile_engine;
- } else if( e.srcElement ) {
- hostengine = e.srcElement.tile_engine;
- }
-
-
- if( hostengine && hostengine.drag ) {
- if( hostengine.mousedown ) {
- if( netscape ) {
- hostengine.mousex = parseInt(e.pageX) + 0.0;
- hostengine.mousey = parseInt(e.pageY) + 0.0;
- } else {
- hostengine.mousex = parseInt(window.event.clientX) + 0.0;
- hostengine.mousey = parseInt(window.event.clientY) + 0.0;
- }
- hostengine.drag(hostengine.mousex-hostengine.lastmousex,hostengine.mousey-hostengine.lastmousey);
- }
- hostengine.lastmousex = hostengine.mousex;
- hostengine.lastmousey = hostengine.mousey;
- }
-
- // must return false to prevent operating system drag and drop from handling events
- return false;
- }
-
- ///
- /// catch mouse down
- ///
-
- this.event_mouse_down = function(e) {
-
- var hostengine = null;
- if( window && window.event && window.event.srcElement ) {
- hostengine = window.event.srcElement.tile_engine;
- } else if( e.target ) {
- hostengine = e.target.tile_engine;
- } else if( e.srcElement ) {
- hostengine = e.srcElement.tile_engine;
- }
-
-
- if( hostengine ) {
- if( netscape ) {
- hostengine.mousex = parseInt(e.pageX) + 0.0;
- hostengine.mousey = parseInt(e.pageY) + 0.0;
- } else {
- hostengine.mousex = parseInt(window.event.clientX) + 0.0;
- hostengine.mousey = parseInt(window.event.clientY) + 0.0;
- }
- hostengine.lastmousex = hostengine.mousex;
- hostengine.lastmousey = hostengine.mousey;
- hostengine.mousedown = 1;
- }
-
- // must return false to prevent operating system drag and drop from handling events
- return false;
- }
-
- ///
- /// catch double click (use to center map)
- ///
-
- this.event_double_click = function(e) {
-
- var hostengine = null;
- if( window && window.event && window.event.srcElement ) {
- hostengine = window.event.srcElement.tile_engine;
- } else if( e.target ) {
- hostengine = e.target.tile_engine;
- } else if( e.srcElement ) {
- hostengine = e.srcElement.tile_engine;
- }
-
-
- if( hostengine ) {
- if( netscape ) {
- hostengine.mousex = parseInt(e.pageX) + 0.0;
- hostengine.mousey = parseInt(e.pageY) + 0.0;
- } else {
- hostengine.mousex = parseInt(window.event.clientX) + 0.0;
- hostengine.mousey = parseInt(window.event.clientY) + 0.0;
- }
- var dx = hostengine.mousex-(hostengine.displaywidth/2)-hostengine.parent_x;
- var dy = hostengine.mousey-(hostengine.displayheight/2)-hostengine.parent_y;
- hostengine.drag(-dx,-dy); // TODO smooth
- }
-
- // must return false to prevent operating system drag and drop from handling events
- return false;
-
- }
-
- ///
- /// catch mouse up
- ///
-
- this.event_mouse_up = function(e) {
-
- var hostengine = null;
- if( window && window.event && window.event.srcElement ) {
- hostengine = window.event.srcElement.tile_engine;
- } else if( e.target ) {
- hostengine = e.target.tile_engine;
- } else if( e.srcElement ) {
- hostengine = e.srcElement.tile_engine;
- }
-
-
- if( hostengine ) {
- if( netscape ) {
- hostengine.mousex = parseInt(e.pageX) + 0.0;
- hostengine.mousey = parseInt(e.pageY) + 0.0;
- } else {
- hostengine.mousex = parseInt(window.event.clientX) + 0.0;
- hostengine.mousey = parseInt(window.event.clientY) + 0.0;
- }
- hostengine.mousedown = 0;
- }
-
- // must return false to prevent operating system drag and drop from handling events
- return false;
- }
-
- ///
- /// catch mouse out
- ///
-
- this.event_mouse_out = function(e) {
-
- var hostengine = null;
- if( window && window.event && window.event.srcElement ) {
- hostengine = window.event.srcElement.tile_engine;
- } else if( e.target ) {
- hostengine = e.target.tile_engine;
- } else if( e.srcElement ) {
- hostengine = e.srcElement.tile_engine;
- }
-
-
- if( hostengine ) {
- if( netscape ) {
- hostengine.mousex = parseInt(e.pageX) + 0.0;
- hostengine.mousey = parseInt(e.pageY) + 0.0;
- } else {
- hostengine.mousex = parseInt(window.event.clientX) + 0.0;
- hostengine.mousey = parseInt(window.event.clientY) + 0.0;
- }
- hostengine.mousedown = 0;
- }
-
- // must return false to prevent operating system drag and drop from handling events
- return false;
- }
-
-
- ///
- /// register new handlers to catch desired events
- ///
-
- // NW removed parameter - always use parent
- this.event_catch = function() {
-
- this.parent.style.cursor = 'move';
-
- if( netscape ) {
- window.captureEvents(Event.MOUSEMOVE);
- window.captureEvents(Event.KEYPRESS);
- }
-
- this.parent.onmousemove = this.event_mouse_move;
- this.parent.onmousedown = this.event_mouse_down;
- this.parent.onmouseup = this.event_mouse_up;
- this.parent.onkeypress = this.event_key;
- window.ondblclick = this.event_double_click;
-
- if( window ) {
- window.onmousemove = this.event_mouse_move;
- window.onmouseup = this.event_mouse_up;
- window.ondblclick = this.event_double_click;
- }
-
- }
-
- this.setURLAttribute = function(k,v)
- {
- this.urlAttr[k] = v;
- }
-
- this.getURLAttribute = function(k)
- {
- return this.urlAttr[k];
- }
-
- this.getDownloadedTileBounds = function()
- {
- var bounds = new Array();
- bounds.w=this.lon_min;
- bounds.s=normallat(this.lat_min);
- bounds.e=this.lon_max;
- bounds.n=normallat(this.lat_max);
- return bounds;
- }
-
- this.getVisibleBounds = function()
- {
- var bounds = new Array();
- bounds.w = this.xToLon(0);
- bounds.s = this.yToLat(this.theheight);
- bounds.e = this.xToLon(this.thewidth);
- bounds.n = this.yToLat(0);
- return bounds;
- }
-
- // navout and navin stuff - START
- // draw navigation buttons into the parent div
-
- // ENTRY CODE BEGINS HERE....
-
-
- // get parent div or fail
- this.parent = document.getElementById(parentname);
- if( this.parent == null ) {
- alert('The tile map engine cannot find a parent container named ['
- +parentname+']');
- return;
- }
-
- //
- // store for later
- //
-
- this.parentname = parentname;
- this.hints = hints;
- this.feedurl = feedurl;
- this.url = url;
- this.lon = lon;
- this.lat = mercatorlat(lat);
- this.thewidth = w;
- this.theheight = h;
- this.dragcontainer = 1;
- this.debug = 0;
-
- // for firefox keyboard
- defaultEngine = this;
- document.engine = this;
-
-
- //
- // decide on display width and height
- //
- if( !w || !h )
- {
- w = parseInt(this.parent.style.width);
- h = parseInt(this.parent.style.height);
- if(!w || !h)
- {
- w = 512;
- h = 256;
- this.parent.style.width = w + 'px';
- this.parent.style.height = h + 'px';
- }
- }
- else
- {
- this.parent.style.width = parseInt(w) + 'px';
- this.parent.style.height = parseInt(h) + 'px';
- }
- this.displaywidth = w;
- this.displayheight = h;
-
- this.minzoom = 0;
- this.maxzoom = 20;
-
- //
- // enforce parent div style?
- // position absolute is really only required for firefox
- // http://www.quirksmode.org/js/findpos.html
- //
-
- this.parent_x = getCSSPositionX(this.parent);
- this.parent_y = getCSSPositionY(this.parent);
-
- this.parent.style.position = 'relative';
- this.parent.style.overflow = 'hidden';
- this.parent.style.backgroundColor = '#000036';
-
-
- // attach event capture parent div
- this.event_catch();
-
- this.clean();
- //this.makeZoom();
-
- this.zoomTo(zoom);
-}
-
-
-function normallat(mercatorlat)
-{
- var tp = 180/PI*(2 * Math.atan(Math.exp(mercatorlat * PI / 180)) - PI / 2);
- return tp;
-}
-
-function mercatorlat(normallat)
-{
- var lpi = 3.14159265358979323846;
- return Math.log( Math.tan( (lpi / 4.0) + (normallat / 180.0 * lpi / 2.0))) *
- 180.0 / lpi ;
-}
projects / rails.git / commitdiff