colouring-montreal/app/src/tileserver.js
2018-10-25 13:48:48 +01:00

189 lines
5.4 KiB
JavaScript

/**
* Tileserver routes for Express app
*
*/
import express from 'express';
import { get_bbox, render_tile } from './tile';
import { strictParseInt } from './parse';
// tiles router
const router = express.Router()
// basic geometry tiles
router.get('/base_light/:z/:x/:y.png', function(req, res) {
const bbox = get_bbox(req.params)
const table_def = `(
SELECT
b.location_number as location_number,
g.geometry_geom
FROM
geometries as g,
buildings as b
WHERE
g.geometry_id = b.geometry_id
) as outline`
const style_def = ['base_light']
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'))
})
});
// dark theme
router.get('/base_night/:z/:x/:y.png', function(req, res) {
const bbox = get_bbox(req.params)
const table_def = `(
SELECT
b.location_number as location_number,
g.geometry_geom
FROM
geometries as g,
buildings as b
WHERE
g.geometry_id = b.geometry_id
) as outline`
const style_def = ['base_night']
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
router.get('/highlight/:z/:x/:y.png', function(req, res) {
const { highlight } = req.query
const geometry_id = strictParseInt(highlight);
if(isNaN(geometry_id)){
res.status(400).send({error:'Bad parameter'})
return
}
const bbox = get_bbox(req.params)
const table_def = `(
SELECT
g.geometry_id = ${geometry_id} as focus,
g.geometry_geom
FROM
geometries as g,
buildings as b
WHERE
g.geometry_id = b.geometry_id
) as highlight`
const style_def = ['highlight']
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'))
})
});
// date_year choropleth
router.get('/date_year/:z/:x/:y.png', function(req, res) {
const bbox = get_bbox(req.params)
// const table_def = 'geometries'
const table_def = `(
SELECT
b.date_year as date_year,
g.geometry_geom
FROM
geometries as g,
buildings as b
WHERE
g.geometry_id = b.geometry_id
) as outline`
const style_def = ['date_year']
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'))
})
});
// date_year choropleth
router.get('/size_storeys/:z/:x/:y.png', function(req, res) {
const bbox = get_bbox(req.params)
// const table_def = 'geometries'
const table_def = `(
SELECT
(
coalesce(b.size_storeys_attic, 0) +
coalesce(b.size_storeys_core, 0)
) as size_storeys,
g.geometry_geom
FROM
geometries as g,
buildings as b
WHERE
g.geometry_id = b.geometry_id
) as outline`
const style_def = ['size_storeys']
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'))
})
});
// location information depth
router.get('/location/:z/:x/:y.png', function(req, res) {
const bbox = get_bbox(req.params)
const table_def = `(
SELECT
(
case when b.location_name is null then 0 else 1 end +
case when b.location_number is null then 0 else 1 end +
case when b.location_street is null then 0 else 1 end +
case when b.location_line_two is null then 0 else 1 end +
case when b.location_town is null then 0 else 1 end +
case when b.location_postcode is null then 0 else 1 end +
case when b.location_latitude is null then 0 else 1 end +
case when b.location_longitude is null then 0 else 1 end
) as location_info_count,
g.geometry_geom
FROM
geometries as g,
buildings as b
WHERE
g.geometry_id = b.geometry_id
) as location`
const style_def = ['location_info_count']
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'))
})
});
// location information depth
router.get('/likes/:z/:x/:y.png', function(req, res) {
const bbox = get_bbox(req.params)
const table_def = `(
SELECT
g.geometry_geom
FROM
geometries as g,
buildings as b
WHERE
g.geometry_id = b.geometry_id
AND b.likes_total > 0
) as location`
const style_def = ['likes']
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'))
})
});
export default router;