var MapTiles = { # displays maps background from web tiles # code from http://wiki.flightgear.org/Canvas_Snippets#A_simple_tile_map new : func (device, group) { var m = { parents: [MapTiles] }; m.device = device; m.display = m.device.display.display; m.tile_size = 256; m.maps_base = getprop("/sim/fg-home") ~ '/cache/maps'; m.makeUrl = string.compileTemplate(data['tiles-template']); m.makePath = string.compileTemplate(m.maps_base ~ '/{server}/{type}/{z}/{x}/{y}.{format}'); m.num_tiles = [ math.ceil( m.device.data.mapsize[0] / m.tile_size ) + 1, math.ceil( m.device.data.mapsize[1] / m.tile_size ) + 1 ]; m.center_tile_offset = [ (m.num_tiles[0] - 1) / 2, (m.num_tiles[1] - 1) / 2 ]; m.visibility = m.device.role == 'MFD'; m.group = group.createChild('group', 'tiles') .setTranslation( m.device.role == 'MFD' ? (m.device.data.mapview[0] - m.device.data.mapsize[0] + m.device.data.mapclip.left)/2 : -520, m.device.role == 'MFD' ? -250 : -45) .setVisible(m.visibility); m.tiles = setsize([], m.num_tiles[0]); m.last_tile = [-1,-1]; m.last_type = data['tiles-type']; m.initialize_grid(); if (m.device.role == 'PFD') m.device.softkeys.colored.INSETTERRAIN = 1; if (m.device.role == 'MFD') m.device.softkeys.colored.MAPTERRAIN = 1; return m; }, setVisible : func (v) { if (v != me.visibility) { me.visibility = v; me.group.setVisible(v); } }, # initialize the map by setting up a grid of raster images initialize_grid : func { for(var x = 0; x < me.num_tiles[0]; x += 1) { me.tiles[x] = setsize([], me.num_tiles[1]); for(var y = 0; y < me.num_tiles[1]; y += 1) me.tiles[x][y] = me.group.createChild('image', 'tile ' ~ x ~ ',' ~ y); } }, # this is the callback that will be regularly called by the timer to update the map update : func { if (! me.visibility) return; var n = math.pow(2, me.device.data.zoom); var offset = [ n * ((data.lon + 180) / 360) - me.center_tile_offset[0], (1 - math.ln(math.tan(data.lat * math.pi/180) + 1 / math.cos(data.lat * math.pi/180)) / math.pi) / 2 * n - me.center_tile_offset[1] ]; var tile_index = [int(offset[0]), int(offset[1])]; var ox = tile_index[0] - offset[0]; var oy = tile_index[1] - offset[1]; for (var x = 0; x < me.num_tiles[0]; x += 1) for(var y = 0; y < me.num_tiles[1]; y += 1) me.tiles[x][y] .setTranslation( int((ox + x) * me.tile_size + 0.5), int((oy + y) * me.tile_size + 0.5)); if (tile_index[0] != me.last_tile[0] or tile_index[1] != me.last_tile[1] or data['tiles-type'] != me.last_type) { for(var x = 0; x < me.num_tiles[0]; x += 1) for(var y = 0; y < me.num_tiles[1]; y += 1) { var pos = { z: me.device.data.zoom, x: int(offset[0] + x), y: int(offset[1] + y), type: data['tiles-type'], server : data['tiles-server'], format: data['tiles-format'], apikey: data['tiles-apikey'], }; (func { var img_path = me.makePath(pos); logprint(LOG_DEBUG, 'img_path: ', img_path); var tile = me.tiles[x][y]; if (io.stat(img_path) == nil) { # image not found, save in $FG_HOME var img_url = me.makeUrl(pos); logprint(LOG_DEBUG, 'requesting ' ~ img_url); http.save(img_url, img_path) .done(func {logprint(LOG_INFO, 'received image ' ~ img_path); tile.set("src", img_path);}) .fail(func (r) logprint(LOG_WARN, 'Failed to get image ' ~ img_path ~ ' ' ~ r.status ~ ': ' ~ r.reason)); } else { # cached image found, reusing logprint(LOG_DEBUG, 'loading ' ~ img_path); tile.set("src", img_path); } })(); } me.last_tile = tile_index; me.last_type = data['tiles-type']; } }, };