From 6284c9d8b45b4df112326c23037a5c7c2e0b89d0 Mon Sep 17 00:00:00 2001
From: Markus Koch <markus@notsyncing.net>
Date: Sat, 18 Apr 2020 12:35:36 +0200
Subject: [PATCH] Center markers etc. on block

Before, markers were set to the bottom left corner of a block.
Now, it is nicely centered even on high zoom levels.
---
 htdocs/mapscript.js | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/htdocs/mapscript.js b/htdocs/mapscript.js
index e3689c6..83967ba 100644
--- a/htdocs/mapscript.js
+++ b/htdocs/mapscript.js
@@ -83,6 +83,29 @@ function load_svg(name, url, active=1) {
 	xhttp_ps.send();
 }
 
+function json_center_on_block(json) {
+	for (var i = 0; i < json.length; i++) {
+		if (json[i].geometry && json[i].geometry.coordinates) {
+			switch (json[i].geometry.type) {
+			case "Point":
+					json[i].geometry.coordinates[0] += 0.5;
+					json[i].geometry.coordinates[1] += 0.5;
+				break;
+			case "LineString":
+				for (var j = 0; j < json[i].geometry.coordinates.length; j++) {
+					json[i].geometry.coordinates[j][0] += 0.5;
+					json[i].geometry.coordinates[j][1] += 0.5;
+				}
+				break;
+			default:
+				console.log("centering: Type " + json[i].geometry.type + " not yet implemented.");
+				break;
+			}
+		}
+	}
+	return json;
+}
+
 function load_tiles(name, id) {
 	var satellite = L.tileLayer('https://notsyncing.net/maps.linux-forks.de/tiles/?id={id}&z={z}&x={x}&y={y}', {
 		maxZoom: 14 /*8*/,
@@ -136,7 +159,8 @@ function load_geojson(name, url, iconname, iconcolor, active=1, style={}) {
 						};
 					break;
 				}
-				var geojson = L.geoJSON(JSON.parse(xhttp_ps.responseText), {
+				var json = json_center_on_block(JSON.parse(xhttp_ps.responseText));
+				var geojson = L.geoJSON(json, {
 					style: style,
 					onEachFeature: onEachFeature,
 					pointToLayer: pointToLayer