From 1fe1d13c600b7dfe421b3b99b833b7d5d1232724 Mon Sep 17 00:00:00 2001
From: Dennis Fink
Date: Thu, 23 Jul 2026 00:18:21 +0200
Subject: Add GPX trail maps to blog posts

This adds a trail flow block so posts can include attached GPX files as
interactive maps with route display, elevation charts, activity
summaries, and start/finish markers.

The trail assets are loaded only when needed, keeping the shared
templates clean while vendoring the Leaflet dependencies required for
offline, self-hosted map rendering.
---
 .../leaflet-elevation/src/handlers/altitude.js     | 78 ++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 assets/static/vendor/leaflet-elevation/src/handlers/altitude.js

(limited to 'assets/static/vendor/leaflet-elevation/src/handlers/altitude.js')

diff --git a/assets/static/vendor/leaflet-elevation/src/handlers/altitude.js b/assets/static/vendor/leaflet-elevation/src/handlers/altitude.js
new file mode 100644
index 0000000..b7fe6e3
--- /dev/null
+++ b/assets/static/vendor/leaflet-elevation/src/handlers/altitude.js
@@ -0,0 +1,78 @@
+export function Altitude() {
+	
+	const _  = L.Control.Elevation.Utils;
+
+	let opts       = this.options;
+	let altitude   = {};
+
+	let theme           = opts.theme.split(' ')[0].replace('-theme', '');
+	let color           = _.Colors[theme] || {};
+
+	opts.altitudeFactor = opts.imperial ? this.__footFactor : (opts.altitudeFactor || 1); // 1 m = (1 m)
+	altitude.label      = opts.imperial ? "ft" : opts.yLabel;
+
+	return {
+		name: 'altitude',
+		required: this.options.slope,
+		meta: 'z',
+		unit: altitude.label,
+		statsName: 'elevation',
+		deltaMax: this.options.altitudeDeltaMax,
+		clampRange: this.options.altitudeRange,
+		// init: ({point}) => {
+		// 	// "alt" property is generated inside "leaflet"
+		// 	if ("alt" in point) point.meta.ele = point.alt;
+		// },
+		pointToAttr: (point, i) => {
+			if ("alt" in point) point.meta.ele = point.alt; // "alt" property is generated inside "leaflet"
+			return this._data[i].z *= opts.altitudeFactor;
+		},
+		stats: { max: _.iMax, min: _.iMin, avg: _.iAvg },
+		grid: {
+			axis      : "y",
+			position  : "left",
+			scale     : "y" // this._chart._y,
+		},
+		scale: {
+			axis    : "y",
+			position: "left",
+			scale   : "y", // this._chart._y,
+			labelX  : -3,
+			labelY  : -8,
+		},
+		path: {
+			label        : 'Altitude',
+			scaleX       : 'distance',
+			scaleY       : 'altitude',
+			className    : 'area',
+			color        : color.area || theme,
+			strokeColor  : opts.detached ? color.stroke : '#000',
+			strokeOpacity: "1",
+			fillOpacity  : opts.detached ? (color.alpha || '0.8') : 1,
+			preferCanvas : opts.preferCanvas,
+		},
+		tooltip: {
+			name: 'y',
+			chart: (item) => L._("y: ") + _.round(item[opts.yAttr], opts.decimalsY) + " " + altitude.label,
+			marker: (item) => _.round(item[opts.yAttr], opts.decimalsY) + " " + altitude.label,
+			order: 10,
+		},
+		summary: {
+			"minele"  : {
+				label: "Min Elevation: ",
+				value: (track, unit) => (track.elevation_min || 0).toFixed(2) + ' ' + unit,
+				order: 30,
+			},
+			"maxele"  : {
+				label: "Max Elevation: ",
+				value: (track, unit) => (track.elevation_max || 0).toFixed(2) + ' ' + unit,
+				order: 31,
+			},
+			"avgele"  : {
+				label: "Avg Elevation: ",
+				value: (track, unit) => (track.elevation_avg || 0).toFixed(2) + ' ' + unit,
+				order: 32,
+			},
+		}
+	};
+}
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