fix: match scatter error bar opacity to selected markers

draftlogs/8102_fix.md

@@ -0,0 +1 @@
+- Make scatter error bars follow marker opacity during selection and deselection [[#8102](https://github.com/plotly/plotly.js/pull/8102)]

src/components/errorbars/style.js

@@ -3,6 +3,8 @@
 var d3 = require('@plotly/d3');
 
 var Color = require('../color');
+const Drawing = require('../drawing');
+const subTypes = require('../../traces/scatter/subtypes');
 
 
 module.exports = function style(traces) {
@@ -12,14 +14,22 @@ module.exports = function style(traces) {
         var xObj = trace.error_x || {};
 
         var s = d3.select(this);
+        let opacity = 1;
+        if (subTypes.hasMarkers(trace)) {
+            const marker = trace.marker;
+            const selectedOpacity = trace.selectedpoints && Drawing.makeSelectedPointStyleFns(trace).selectedOpacityFn;
+            opacity = selectedOpacity || ((point) => (point.mo === undefined ? marker.opacity : point.mo));
+        }
 
         s.selectAll('path.yerror')
+            .style('opacity', opacity)
             .style('stroke-width', yObj.thickness + 'px')
             .call(Color.stroke, yObj.color);
 
         if(xObj.copy_ystyle) xObj = yObj;
 
         s.selectAll('path.xerror')
+            .style('opacity', opacity)
             .style('stroke-width', xObj.thickness + 'px')
             .call(Color.stroke, xObj.color);
     });

src/traces/scatter/style.js

@@ -50,6 +50,7 @@ function styleOnSelect(gd, cd, sel) {
         stylePoints(sel, trace, gd);
         styleText(sel, trace, gd);
     }
+    Registry.getComponentMethod('errorbars', 'style')(sel);
 }
 
 module.exports = {

test/jasmine/tests/errorbars_test.js

@@ -3,6 +3,8 @@ var Plotly = require('../../../lib/index');
 var d3Select = require('../../strict-d3').select;
 var createGraphDiv = require('../assets/create_graph_div');
 var destroyGraphDiv = require('../assets/destroy_graph_div');
+const drag = require('../assets/drag');
+const doubleClick = require('../assets/double_click');
 
 
 describe('errorbar plotting', function() {
@@ -29,6 +31,102 @@ describe('errorbar plotting', function() {
         });
     }
 
+    function checkPointOpacities(expected) {
+        for (const selector of ['.point', '.xerror', '.yerror']) {
+            const values = Array.from(gd.querySelectorAll(selector), (node) => Number(getComputedStyle(node).opacity));
+            expect(values).toBeCloseToArray(expected, 5);
+        }
+    }
+
+    it('applies marker opacity to error bars through selection and clear', async () => {
+        await Plotly.newPlot(gd, [{
+            x: [1, 2, 3],
+            y: [1, 2, 3],
+            mode: 'markers',
+            marker: { opacity: 0.6 },
+            error_x: { type: 'constant', value: 0.2 },
+            error_y: { type: 'constant', value: 0.3 },
+            selected: { marker: { opacity: 0.9 } },
+            unselected: { marker: { opacity: 0.1 } }
+        }]);
+        checkPointOpacities([0.6, 0.6, 0.6]);
+
+        await Plotly.restyle(gd, { selectedpoints: [[1]] });
+        checkPointOpacities([0.1, 0.9, 0.1]);
+
+        await Plotly.restyle(gd, { selectedpoints: [[]] });
+        checkPointOpacities([0.1, 0.1, 0.1]);
+
+        await Plotly.restyle(gd, { selectedpoints: null });
+        checkPointOpacities([0.6, 0.6, 0.6]);
+
+        await Plotly.restyle(gd, { 'marker.opacity': 0 });
+        checkPointOpacities([0, 0, 0]);
+    });
+
+    it('uses point opacity arrays across missing data', async () => {
+        await Plotly.newPlot(gd, [{
+            x: [1, null, 3],
+            y: [1, 2, 3],
+            mode: 'lines+markers',
+            marker: { opacity: [0.8, 0.4, 0.6] },
+            error_x: { type: 'constant', value: 0.2 },
+            error_y: { type: 'constant', value: 0.3 },
+            selectedpoints: [2]
+        }]);
+        checkPointOpacities([0.16, 0.6]);
+
+        await Plotly.restyle(gd, { selectedpoints: null });
+        checkPointOpacities([0.8, 0.6]);
+    });
+
+    for (const dragmode of ['select', 'lasso']) {
+        it(`updates error bars after ${dragmode} and deselection`, async () => {
+            await Plotly.newPlot(gd, [{
+                x: [1, 2, 3],
+                y: [1, 2, 3],
+                mode: 'markers',
+                selected: { marker: { opacity: 0.8 } },
+                unselected: { marker: { opacity: 0.3 } },
+                error_x: { type: 'constant', value: 0.2 },
+                error_y: { type: 'constant', value: 0.3 }
+            }], {
+                width: 400,
+                height: 400,
+                margin: { l: 50, r: 50, t: 50, b: 50 },
+                xaxis: { range: [0, 4] },
+                yaxis: { range: [0, 4] },
+                dragmode
+            });
+            await drag({
+                path: dragmode === 'select'
+                    ? [[100, 300], [150, 250]]
+                    : [[100, 300], [150, 300], [150, 250], [100, 250], [100, 300]]
+            });
+            expect(gd.data[0].selectedpoints).toEqual([0]);
+            checkPointOpacities([0.8, 0.3, 0.3]);
+
+            await doubleClick(200, 200);
+            checkPointOpacities([1, 1, 1]);
+        });
+    }
+
+    it('keeps line-only and bar error opacity independent of scatter marker styling', async () => {
+        await Plotly.newPlot(gd, [
+            {
+                x: [1, 2], y: [1, 2], mode: 'lines', marker: { opacity: 0.2 },
+                error_y: { type: 'constant', value: 0.2 }
+            },
+            {
+                x: [1, 2], y: [1, 2], type: 'bar', marker: { opacity: 0.6 },
+                error_y: { type: 'constant', value: 0.2 }, selectedpoints: [0]
+            }
+        ]);
+        for (const node of gd.querySelectorAll('.yerror')) {
+            expect(Number(getComputedStyle(node).opacity)).toBe(1);
+        }
+    });
+
     it('should autorange to the visible bars and remove invisible bars', function(done) {
         function check(xrange, yrange, xCount, yCount) {
             var xa = gd._fullLayout.xaxis;