Fix various issues with rendering scattermap icons

draftlogs/7825_update.md

@@ -0,0 +1 @@
+- Enable scattermap icons to render in color, upgrade Maki icons version to 8.2, and standardize scattermap legend icons to circles [[#7825](https://github.com/plotly/plotly.js/pull/7825)]

src/components/drawing/index.js

@@ -1866,7 +1866,10 @@ function getMarkerAngle(d, trace) {
 
     if (angle === undefined) {
         angle = trace.marker.angle;
-        if (!angle || Lib.isArrayOrTypedArray(angle)) {
+        // For scattermap traces, `trace.marker.angle` defaults to 'auto',
+        // which is meaningful for the MapLibre code but not for plotly.js itself. 
+        // Therefore we need to coerce any non-numeric values to 0 (no rotation).
+        if (!isNumeric(angle) || Lib.isArrayOrTypedArray(angle)) {
             angle = 0;
         }
     }

src/components/legend/style.js

@@ -207,7 +207,12 @@ module.exports = function style(s, gd, legend) {
 
             if (showMarker) {
                 dEdit.mc = boundVal('marker.color', pickFirst);
-                dEdit.mx = boundVal('marker.symbol', pickFirst);
+                // Scattermap traces use marker.symbol to specify the Maki icon used in
+                // the map itself, which usually doesn't correspond to a valid
+                // Plotly symbol. Always draw a circle so the swatch is consistent
+                // across symbols rather than silently mismatched.
+                var isScattermapTrace = trace.type === 'scattermap' || trace.type === 'scattermapbox';
+                dEdit.mx = isScattermapTrace ? 'circle' : boundVal('marker.symbol', pickFirst);
                 dEdit.mo = boundVal('marker.opacity', Lib.mean, [0.2, 1]);
                 dEdit.mlc = boundVal('marker.line.color', pickFirst);
                 dEdit.mlw = boundVal('marker.line.width', Lib.mean, [0, 5], CST_MARKER_LINE_WIDTH);

src/plots/map/layers.js

@@ -230,7 +230,7 @@ function convertOpts(opts) {
             var textOpts = convertTextOpts(symbol.textposition, symbol.iconsize);
 
             Lib.extendFlat(layout, {
-                'icon-image': symbol.icon + '-15',
+                'icon-image': symbol.icon,
                 'icon-size': symbol.iconsize / 10,
 
                 'text-field': symbol.text,

src/plots/map/map.js

@@ -107,14 +107,14 @@ proto.createMap = function(calcData, fullLayout, resolve, reject) {
     var requestedIcons = {};
     map.on('styleimagemissing', function(e) {
         var id = e.id;
-        if(!requestedIcons[id] && id.includes('-15')) {
+        if(!requestedIcons[id] && /^[a-zA-Z0-9-]+$/.test(id)) {
             requestedIcons[id] = true;
             var img = new Image(15, 15);
             img.onload = function() {
-                map.addImage(id, img);
+                map.addImage(id, img, {sdf: true});
             };
             img.crossOrigin = 'Anonymous';
-            img.src = 'https://unpkg.com/maki@2.1.0/icons/' + id + '.svg';
+            img.src = "https://cdn.jsdelivr.net/npm/@mapbox/maki@8.2.0/icons/" + id + '.svg';
         }
     });
 

src/traces/scattermap/convert.js

@@ -116,7 +116,7 @@ module.exports = function convert(gd, calcTrace) {
 
         Lib.extendFlat(symbol.layout, {
             visibility: 'visible',
-            'icon-image': '{symbol}-15',
+            'icon-image': '{symbol}',
             'text-field': '{text}'
         });
 
@@ -141,9 +141,11 @@ module.exports = function convert(gd, calcTrace) {
 
             Lib.extendFlat(symbol.paint, {
                 'icon-opacity': trace.opacity * trace.marker.opacity,
-
-                // TODO does not work ??
-                'icon-color': trace.marker.color
+                'icon-color': trace.marker.color,
+                // Set a tiny blur to make the edges look nicer
+                'icon-halo-color': trace.marker.color,
+                'icon-halo-width': 2,
+                'icon-halo-blur': 1.5,
             });
         }
 

test/jasmine/tests/scattermap_test.js

@@ -1248,6 +1248,45 @@ describe('Test plotly events on a scattermap plot when css transform is present:
     });
 });
 
+describe('scattermap legend', function() {
+    var gd;
+
+    beforeEach(function() {
+        Plotly.setPlotConfig({});
+        gd = createGraphDiv();
+    });
+
+    afterEach(function() {
+        Plotly.purge(gd);
+        destroyGraphDiv();
+    });
+
+    it('@gl should always draw a circle swatch regardless of marker.symbol', function(done) {
+        // marker.symbol on map traces is a Maki/sprite icon name that the SVG
+        // legend can't reproduce, so the swatch should consistently be a circle.
+        // The circle symbol path is the only one using an arc ('A') command;
+        // square/triangle/etc. use only straight (H/V/L) segments.
+        Plotly.newPlot(gd, {
+            data: [
+                { type: 'scattermap', lat: [0], lon: [0], mode: 'markers', name: 'square', marker: { symbol: 'square' } },
+                { type: 'scattermap', lat: [1], lon: [1], mode: 'markers', name: 'tri', marker: { symbol: 'triangle-stroked' } }
+            ],
+            layout: {
+                map: { style: 'open-street-map', zoom: 6, center: { lat: 0.5, lon: 0.5 } },
+                showlegend: true
+            }
+        }).then(function() {
+            var swatches = gd.querySelectorAll('.legend .legendpoints path.scatterpts');
+            expect(swatches.length).toBe(2, 'one swatch per trace');
+            swatches.forEach(function(node) {
+                var d = node.getAttribute('d');
+                expect(d.indexOf('A')).toBeGreaterThan(-1, 'swatch is a circle (has arc): ' + d);
+                expect(d.indexOf('NaN')).toBe(-1, 'swatch path has no NaN: ' + d);
+            });
+        }).then(done, done.fail);
+    });
+});
+
 describe('scattermap restyle', function() {
     var gd;