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.

1 files changed, 96 insertions, 0 deletions

diff --git a/assets/static/vendor/leaflet-elevation/src/components/marker.js b/assets/static/vendor/leaflet-elevation/src/components/marker.js
new file mode 100644
index 0000000..6f1f6af
--- /dev/null
+++ b/assets/static/vendor/leaflet-elevation/src/components/marker.js
@@ -0,0 +1,96 @@
+import * as D3 from './d3.js';
+
+const _ = L.Control.Elevation.Utils;
+
+export var Marker = L.Class.extend({
+
+	initialize(options, control) {
+		this.options = options;
+		this.control = control
+
+		switch(this.options.marker) {
+			case 'elevation-line':
+				// this._container = d3.create("g").attr("class", "height-focus-group");
+			break;
+			case 'position-marker':
+				// this._marker   = L.circleMarker([0, 0], { pane: 'overlayPane', radius: 6, fillColor: '#fff', fillOpacity:1, color: '#000', weight:1, interactive: false });
+				this._marker      = L.marker([0, 0], { icon: this.options.markerIcon, zIndexOffset: 1000000, interactive: false });
+			break;
+		}
+
+		this._labels = {};
+
+		return this;
+	},
+
+	addTo(map) {
+		this._map = map;
+		switch(this.options.marker) {
+			case 'elevation-line':  this._container = d3.select(map.getPane('elevationPane')).select("svg > g").call(D3.PositionMarker({})); break;
+			case 'position-marker': this._marker.addTo(map, { pane: 'overlayPane' }); break;
+		}
+		return this;
+	},
+
+	/**
+	 * Update position marker ("leaflet-marker").
+	 */
+	update(props) {
+		if (props) this._props = props;
+		else props = this._props;
+
+		if (!props) return;
+
+		if (props.options) this.options = props.options;
+		if (!this._map) this.addTo(props.map);
+
+		this._latlng = props.item.latlng;
+
+		switch(this.options.marker) {
+			case 'elevation-line':
+				if (this._container) {
+					let point = this._map.latLngToLayerPoint(this._latlng);
+					point     = L.extend({}, props.item, this._map._rotate ? this._map.rotatedPointToMapPanePoint(point) : point);
+
+					let yMax = (this.control._height() / props.yCoordMax * point[this.options.yAttr]);
+
+					if (!isFinite(yMax) || isNaN(yMax)) yMax = 0;
+
+					this._container.classed("leaflet-hidden", false);
+					this._container.call(D3.PositionMarker({
+						theme : this.options.theme,
+						xCoord: point.x,
+						yCoord: point.y,
+						length: point.y - yMax, // normalized Y
+						labels: this._labels,
+						item: point,
+					}));
+				}
+			break;
+			case 'position-marker':
+				_.removeClass(this._marker.getElement(), 'leaflet-hidden');
+				this._marker.setLatLng(this._latlng);
+			break;
+		}
+	},
+
+	/*
+	 * Hides the position/height indicator marker drawn onto the map
+	 */
+	remove() {
+		this._props = null;
+		switch(this.options.marker) {
+			case 'elevation-line':  this._container && this._container.classed("leaflet-hidden", true); break;
+			case 'position-marker': _.addClass(this._marker.getElement(), 'leaflet-hidden');            break;
+		}
+	},
+
+	getLatLng() {
+		return this._latlng;
+	},
+
+	_registerTooltip(props) {
+		this._labels[props.name] = props;
+	}
+
+});