GraphNG: support dashes (#30070)

packages/grafana-ui/src/components/GraphNG/GraphNG.tsx

@@ -175,6 +175,7 @@ export const GraphNG: React.FC<GraphNGProps> = ({
         lineColor: customConfig.lineColor ?? seriesColor,
         lineWidth: customConfig.lineWidth,
         lineInterpolation: customConfig.lineInterpolation,
+        lineStyle: customConfig.lineStyle,
         showPoints,
         pointSize: customConfig.pointSize,
         pointColor: customConfig.pointColor ?? seriesColor,

packages/grafana-ui/src/components/uPlot/config.ts

@@ -48,6 +48,14 @@ export enum ScaleDistribution {
   Logarithmic = 'log',
 }
 
+/**
+ * @alpha
+ */
+export interface LineStyle {
+  fill?: 'solid' | 'dash' | 'dot' | 'square'; // cap = 'butt' | 'round' | 'square'
+  dash?: number[];
+}
+
 /**
  * @alpha
  */
@@ -55,7 +63,7 @@ export interface LineConfig {
   lineColor?: string;
   lineWidth?: number;
   lineInterpolation?: LineInterpolation;
-  lineDash?: number[];
+  lineStyle?: LineStyle;
   spanNulls?: boolean;
 }
 

packages/grafana-ui/src/components/uPlot/config/UPlotSeriesBuilder.ts

@@ -25,6 +25,7 @@ export class UPlotSeriesBuilder extends PlotConfigBuilder<SeriesProps, Series> {
       lineInterpolation,
       lineColor,
       lineWidth,
+      lineStyle,
       showPoints,
       pointColor,
       pointSize,
@@ -40,6 +41,12 @@ export class UPlotSeriesBuilder extends PlotConfigBuilder<SeriesProps, Series> {
     } else {
       lineConfig.stroke = lineColor;
       lineConfig.width = lineWidth;
+      if (lineStyle && lineStyle.fill !== 'solid') {
+        if (lineStyle.fill === 'dot') {
+          // lineConfig.dashCap = 'round'; // square or butt
+        }
+        lineConfig.dash = lineStyle.dash ?? [10, 10];
+      }
       lineConfig.paths = (self: uPlot, seriesIdx: number, idx0: number, idx1: number) => {
         let pathsBuilder = mapDrawStyleToPathBuilder(drawStyle, lineInterpolation);
         return pathsBuilder(self, seriesIdx, idx0, idx1);

public/app/plugins/panel/graph3/LineStyleEditor.tsx

@@ -0,0 +1,123 @@
+import React, { useMemo } from 'react';
+import { FieldOverrideEditorProps, SelectableValue } from '@grafana/data';
+import { HorizontalGroup, IconButton, LineStyle, RadioButtonGroup, Select } from '@grafana/ui';
+
+type LineFill = 'solid' | 'dash' | 'dot';
+
+const lineFillOptions: Array<SelectableValue<LineFill>> = [
+  {
+    label: 'Solid',
+    value: 'solid',
+  },
+  {
+    label: 'Dash',
+    value: 'dash',
+  },
+  // {
+  //   label: 'Dots',
+  //   value: 'dot',
+  // },
+];
+
+const dashOptions: Array<SelectableValue<string>> = [
+  '10, 10', // default
+  '10, 15',
+  '10, 20',
+  '10, 25',
+  '10, 30',
+  '10, 40',
+  '15, 10',
+  '20, 10',
+  '25, 10',
+  '30, 10',
+  '40, 10',
+  '50, 10',
+  '5, 10',
+  '30, 3, 3',
+].map(txt => ({
+  label: txt,
+  value: txt,
+}));
+
+const dotOptions: Array<SelectableValue<string>> = [
+  '0, 10', // default
+  '0, 20',
+  '0, 30',
+  '0, 40',
+  '0, 3, 3',
+].map(txt => ({
+  label: txt,
+  value: txt,
+}));
+
+export const LineStyleEditor: React.FC<FieldOverrideEditorProps<LineStyle, any>> = ({ value, onChange }) => {
+  const options = useMemo(() => (value?.fill === 'dash' ? dashOptions : dotOptions), [value]);
+  const current = useMemo(() => {
+    if (!value?.dash?.length) {
+      return options[0];
+    }
+    const str = value.dash?.join(', ');
+    const val = options.find(o => o.value === str);
+    if (!val) {
+      return {
+        label: str,
+        value: str,
+      };
+    }
+    return val;
+  }, [value, options]);
+
+  return (
+    <HorizontalGroup>
+      <RadioButtonGroup
+        value={value?.fill || 'solid'}
+        options={lineFillOptions}
+        onChange={v => {
+          onChange({
+            ...value,
+            fill: v!,
+          });
+        }}
+      />
+      {value?.fill && value?.fill !== 'solid' && (
+        <>
+          <Select
+            allowCustomValue={true}
+            options={options}
+            value={current}
+            width={20}
+            onChange={v => {
+              onChange({
+                ...value,
+                dash: parseText(v.value ?? ''),
+              });
+            }}
+            formatCreateLabel={t => `Segments: ${parseText(t).join(', ')}`}
+          />
+          <div>
+            &nbsp;
+            <a
+              title="The input expects a segment list"
+              href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash#Parameters"
+              target="_blank"
+              rel="noreferrer"
+            >
+              <IconButton name="question-circle" />
+            </a>
+          </div>
+        </>
+      )}
+    </HorizontalGroup>
+  );
+};
+
+function parseText(txt: string): number[] {
+  const segments: number[] = [];
+  for (const s of txt.split(/(?:,| )+/)) {
+    const num = Number.parseInt(s, 10);
+    if (!isNaN(num)) {
+      segments.push(num);
+    }
+  }
+  return segments;
+}

public/app/plugins/panel/graph3/__snapshots__/migrations.test.ts.snap

@@ -117,6 +117,13 @@ Object {
         "axisPlacement": "auto",
         "drawStyle": "line",
         "fillOpacity": 10,
+        "lineStyle": Object {
+          "dash": Array [
+            10,
+            10,
+          ],
+          "fill": "dash",
+        },
         "lineWidth": 1,
         "pointSize": 6,
         "showPoints": "never",
@@ -155,6 +162,16 @@ Object {
             "id": "custom.axisLabel",
             "value": "Y222",
           },
+          Object {
+            "id": "custom.lineStyle",
+            "value": Object {
+              "dash": Array [
+                5,
+                8,
+              ],
+              "fill": "dash",
+            },
+          },
         ],
       },
     ],

public/app/plugins/panel/graph3/migrations.test.ts

@@ -186,6 +186,9 @@ const twoYAxis = {
     {
       alias: 'B-series',
       yaxis: 2,
+      dashLength: 5,
+      dashes: true,
+      spaceLength: 8,
     },
   ],
   thresholds: [],
@@ -199,7 +202,7 @@ const twoYAxis = {
     },
   ],
   fillGradient: 0,
-  dashes: false,
+  dashes: true,
   hiddenSeries: false,
   points: false,
   bars: false,

public/app/plugins/panel/graph3/migrations.ts

@@ -16,6 +16,7 @@ import {
   AxisPlacement,
   DrawStyle,
   LineInterpolation,
+  LineStyle,
   PointVisibility,
 } from '@grafana/ui/src/components/uPlot/config';
 import { Options } from './types';
@@ -52,6 +53,12 @@ export function flotToGraphOptions(angular: any): { fieldConfig: FieldConfigSour
     };
   }
 
+  // Dashes
+  const dash: LineStyle = {
+    fill: angular.dashes ? 'dash' : 'solid',
+    dash: [angular.dashLength ?? 10, angular.spaceLength ?? 10],
+  };
+
   // "seriesOverrides": [
   //   {
   //     "$$hashKey": "object:183",
@@ -98,6 +105,8 @@ export function flotToGraphOptions(angular: any): { fieldConfig: FieldConfigSour
         },
         properties: [],
       };
+      let dashOverride: LineStyle | undefined = undefined;
+
       for (const p of Object.keys(seriesOverride)) {
         const v = seriesOverride[p];
         switch (p) {
@@ -165,10 +174,37 @@ export function flotToGraphOptions(angular: any): { fieldConfig: FieldConfigSour
               value: 2 + v * 2,
             });
             break;
+          case 'dashLength':
+          case 'spaceLength':
+          case 'dashes':
+            if (!dashOverride) {
+              dashOverride = {
+                fill: dash.fill,
+                dash: [...dash.dash!],
+              };
+            }
+            switch (p) {
+              case 'dashLength':
+                dashOverride.dash![0] = v;
+                break;
+              case 'spaceLength':
+                dashOverride.dash![1] = v;
+                break;
+              case 'dashes':
+                dashOverride.fill = v ? 'dash' : 'solid';
+                break;
+            }
+            break;
           default:
             console.log('Ignore override migration:', seriesOverride.alias, p, v);
         }
       }
+      if (dashOverride) {
+        rule.properties.push({
+          id: 'custom.lineStyle',
+          value: dashOverride,
+        });
+      }
       if (rule.properties.length) {
         overrides.push(rule);
       }
@@ -185,6 +221,9 @@ export function flotToGraphOptions(angular: any): { fieldConfig: FieldConfigSour
   }
 
   graph.lineWidth = angular.linewidth;
+  if (dash.fill !== 'solid') {
+    graph.lineStyle = dash;
+  }
 
   if (isNumber(angular.pointradius)) {
     graph.pointSize = 2 + angular.pointradius * 2;

public/app/plugins/panel/graph3/module.tsx

@@ -11,6 +11,7 @@ import {
   GraphFieldConfig,
   graphFieldOptions,
   LegendDisplayMode,
+  LineStyle,
   PointVisibility,
   ScaleDistribution,
   ScaleDistributionConfig,
@@ -20,6 +21,7 @@ import { GraphPanel } from './GraphPanel';
 import { graphPanelChangedHandler } from './migrations';
 import { Options } from './types';
 import { ScaleDistributionEditor } from './ScaleDistributionEditor';
+import { LineStyleEditor } from './LineStyleEditor';
 
 export const plugin = new PanelPlugin<Options, GraphFieldConfig>(GraphPanel)
   .setPanelChangeHandler(graphPanelChangedHandler)
@@ -75,6 +77,16 @@ export const plugin = new PanelPlugin<Options, GraphFieldConfig>(GraphPanel)
           },
           showIf: c => c.drawStyle !== DrawStyle.Points,
         })
+        .addCustomEditor<void, LineStyle>({
+          id: 'lineStyle',
+          path: 'lineStyle',
+          name: 'Line style',
+          showIf: c => c.drawStyle === DrawStyle.Line,
+          editor: LineStyleEditor,
+          override: LineStyleEditor,
+          process: identityOverrideProcessor,
+          shouldApply: f => f.type === FieldType.number,
+        })
         .addRadio({
           path: 'fillGradient',
           name: 'Fill gradient',