From 9a0bfc39a45fa69c01dfa0365e34c746c5e43309 Mon Sep 17 00:00:00 2001
From: Jannis R <mail@jannisr.de>
Date: Tue, 15 May 2018 19:39:28 +0200
Subject: [PATCH] radar: polylines option, return polylines

---
 docs/radar.md     |  3 +++
 index.js          |  9 +++++++--
 parse/movement.js | 27 ++++++++++++++++++---------
 3 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/docs/radar.md b/docs/radar.md
index 281b2f77..8c4fa6a8 100644
--- a/docs/radar.md
+++ b/docs/radar.md
@@ -11,6 +11,7 @@ With `opt`, you can override the default options, which look like this:
 	results: 256, // maximum number of vehicles
 	duration: 30, // compute frames for the next n seconds
 	frames: 3, // nr of frames to compute
+	polylines: false // return a track shape for each vehicle?
 }
 ```
 
@@ -156,3 +157,5 @@ The response may look like this:
 	} ]
 }, /* … */ ]
 ```
+
+If you pass `polylines: true`, each result will have a `polyline` field, containing an encoded shape. You can use e.g. [`@mapbox/polyline`](https://www.npmjs.com/package/@mapbox/polyline) to decode it.
diff --git a/index.js b/index.js
index ac8f5a8e..b08a408b 100644
--- a/index.js
+++ b/index.js
@@ -313,7 +313,8 @@ const createClient = (profile, request = _request) => {
 			results: 256, // maximum number of vehicles
 			duration: 30, // compute frames for the next n seconds
 			frames: 3, // nr of frames to compute
-			products: null // optionally an object of booleans
+			products: null, // optionally an object of booleans
+			polylines: false // return a track shape for each vehicle?
 		}, opt || {})
 		opt.when = opt.when || new Date()
 
@@ -339,7 +340,11 @@ const createClient = (profile, request = _request) => {
 		.then((d) => {
 			if (!Array.isArray(d.jnyL)) return []
 
-			const parse = profile.parseMovement(profile, d.locations, d.lines, d.remarks)
+			let polylines = []
+			if (opt.polylines && Array.isArray(d.common.polyL)) {
+				polylines = d.common.polyL
+			}
+			const parse = profile.parseMovement(profile, d.locations, d.lines, d.remarks, polylines)
 			return d.jnyL.map(parse)
 		})
 	}
diff --git a/parse/movement.js b/parse/movement.js
index 4a006026..5de96cd9 100644
--- a/parse/movement.js
+++ b/parse/movement.js
@@ -1,13 +1,12 @@
 'use strict'
 
-const createParseMovement = (profile, locations, lines, remarks) => {
+const createParseMovement = (profile, locations, lines, remarks, polylines) => {
 	// todo: what is m.dirGeo? maybe the speed?
 	// todo: what is m.stopL?
 	// todo: what is m.proc? wut?
 	// todo: what is m.pos?
 	// todo: what is m.ani.dirGeo[n]? maybe the speed?
 	// todo: what is m.ani.proc[n]? wut?
-	// todo: how does m.ani.poly work?
 	const parseMovement = (m) => {
 		const pStopover = profile.parseStopover(profile, locations, lines, remarks, m.date)
 
@@ -24,13 +23,23 @@ const createParseMovement = (profile, locations, lines, remarks) => {
 			frames: []
 		}
 
-		if (m.ani && Array.isArray(m.ani.mSec)) {
-			for (let i = 0; i < m.ani.mSec.length; i++) {
-				res.frames.push({
-					origin: locations[m.ani.fLocX[i]] || null,
-					destination: locations[m.ani.tLocX[i]] || null,
-					t: m.ani.mSec[i]
-				})
+		if (m.ani) {
+			if (Array.isArray(m.ani.mSec)) {
+				for (let i = 0; i < m.ani.mSec.length; i++) {
+					res.frames.push({
+						origin: locations[m.ani.fLocX[i]] || null,
+						destination: locations[m.ani.tLocX[i]] || null,
+						t: m.ani.mSec[i]
+					})
+				}
+			}
+
+			if (m.ani.poly && m.ani.poly.crdEncYX) {
+				res.polyline = m.ani.poly.crdEncYX
+			} else if (m.ani.polyG && Array.isArray(m.ani.polyG.polyXL)) {
+				let p = m.ani.polyG.polyXL[0]
+				// todo: there can be >1 polyline
+				res.polyline = polylines[p] && polylines[p].crdEncXY || null
 			}
 		}