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DRYer tile code

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This commit is contained in:
Tom Russell 2018-08-02 16:56:27 +01:00
parent 3928b47867
commit 717c07595a
1 changed files with 48 additions and 86 deletions
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134
tileserver/index.js
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@ -9,6 +9,16 @@ const SphericalMercator = require('@mapbox/sphericalmercator')
// config file with connection details
const config = require('../config.json')
const DATASOURCE_CONFIG = {
'dbname': config.database.dbname,
'user': config.database.user,
'password': config.database.password,
'port': config.database.port,
'geometry_field': 'geometry_geom',
'extent' : '-20005048.4188,-9039211.13765,19907487.2779,17096598.5401',
'srid': 3857,
'type': 'postgis'
}
const TILE_SIZE = 256
const TILE_BUFFER_SIZE = 64
@ -25,10 +35,8 @@ if (mapnik.register_default_input_plugins) mapnik.register_default_input_plugins
// set up app
const app = express()
// basic geometry tiles
app.get('/outline/:z/:x/:y.png', function(req, res) {
const { z, x, y } = req.params
console.log(z, x, y)
function get_bbox(params){
const { z, x, y } = params
const int_z = parseInt(z);
const int_x = parseInt(x);
@ -40,21 +48,25 @@ app.get('/outline/:z/:x/:y.png', function(req, res) {
return
}
var bbox = mercator.bbox(
return mercator.bbox(
int_x,
int_y,
int_z,
false,
'900913'
);
}
var map = new mapnik.Map(TILE_SIZE, TILE_SIZE, PROJ4_STRING);
function render_tile(bbox, table_def, style_def, cb){
const map = new mapnik.Map(TILE_SIZE, TILE_SIZE, PROJ4_STRING);
map.bufferSize = TILE_BUFFER_SIZE;
var layer = new mapnik.Layer('tile', PROJ4_STRING);
var postgis = new mapnik.Datasource(get_datasource_config());
const layer = new mapnik.Layer('tile', PROJ4_STRING);
const conf = Object.assign({table: table_def}, DATASOURCE_CONFIG)
const postgis = new mapnik.Datasource(conf);
layer.datasource = postgis;
layer.styles = ['polygon'];
layer.styles = style_def
map.load(
path.join(__dirname, 'map_styles', 'polygon.xml'),
@ -63,93 +75,43 @@ app.get('/outline/:z/:x/:y.png', function(req, res) {
if (err) throw err
map.add_layer(layer)
var im = new mapnik.Image(map.width, map.height)
const im = new mapnik.Image(map.width, map.height)
map.extent = bbox
map.render(im, function(err, im) {
if (err) throw err
res.writeHead(200, {'Content-Type': 'image/png'})
res.end(im.encodeSync('png'))
});
map.render(im, cb);
}
)
}
// basic geometry tiles
app.get('/outline/:z/:x/:y.png', function(req, res) {
const bbox = get_bbox(req.params)
const table_def = 'geometries'
const style_def = ['polygon']
render_tile(bbox, table_def, style_def, function(err, im) {
if (err) throw err
res.writeHead(200, {'Content-Type': 'image/png'})
res.end(im.encodeSync('png'))
})
});
// highlight single geometry
app.get('/highlight/:z/:x/:y.png', function(req, res) {
const { z, x, y } = req.params
const { highlight } = req.query
const geometry_id = parseInt(highlight);
console.log(z, x, y, highlight)
if(!geometry_id) res.status(400).send({error:'Bad parameter'})
const bbox = get_bbox(req.params)
const table_def = `(
select * from geometries
where geometry_id = ${geometry_id}
) as highlight`
const style_def = ['highlight']
render_tile(bbox, table_def, style_def, function(err, im) {
if (err) throw err
const int_z = parseInt(z);
const int_x = parseInt(x);
const int_y = parseInt(y);
if (!int_x || !int_y || !int_z){
console.error("Missing x or y or z")
res.status(400).send({error:'Bad parameter'})
return
}
if(!geometry_id){
res.status(400).send({error:'No highlight'})
}
var bbox = mercator.bbox(
int_x,
int_y,
int_z,
false,
'900913'
);
var map = new mapnik.Map(TILE_SIZE, TILE_SIZE, PROJ4_STRING);
map.bufferSize = TILE_BUFFER_SIZE;
var layer_h = new mapnik.Layer('highlight', PROJ4_STRING);
var conf_h = get_datasource_config()
conf_h.table = '(select * from geometries where geometry_id = '+geometry_id+') as highlight'
var postgis_h = new mapnik.Datasource(conf_h);
layer_h.datasource = postgis_h;
layer_h.styles = ['highlight'];
map.load(
path.join(__dirname, 'map_styles', 'polygon.xml'),
{ strict: true },
function(err, map){
if (err) throw err
map.add_layer(layer_h)
var im = new mapnik.Image(map.width, map.height)
map.extent = bbox
map.render(im, function(err, im) {
if (err) throw err
res.writeHead(200, {'Content-Type': 'image/png'})
res.end(im.encodeSync('png'))
});
}
)
res.writeHead(200, {'Content-Type': 'image/png'})
res.end(im.encodeSync('png'))
})
});
function get_datasource_config(){
return {
'table': 'geometries',
'dbname': config.database.dbname,
'user': config.database.user,
'password': config.database.password,
'port': config.database.port,
'geometry_field': 'geometry_geom',
'extent' : '-20005048.4188,-9039211.13765,19907487.2779,17096598.5401',
'srid': 3857,
'type': 'postgis'
}
}
app.listen(8082, () => console.log('Tile server listening on port 8082'))