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