Merge pull request #16095 from ryantxu/flot-pairs

calculate flot pairs

packages/grafana-ui/src/utils/floatPairs.test.ts

+import { getFlotPairs } from './flotPairs';
+
+describe('getFlotPairs', () => {
+  const table = {
+    rows: [[1, 100, 'a'], [2, 200, 'b'], [3, 300, 'c']],
+  };
+  it('should get X and y', () => {
+    const pairs = getFlotPairs({ rows: table.rows, xIndex: 0, yIndex: 1 });
+
+    expect(pairs.length).toEqual(3);
+    expect(pairs[0].length).toEqual(2);
+    expect(pairs[0][0]).toEqual(1);
+    expect(pairs[0][1]).toEqual(100);
+  });
+
+  it('should work with strings', () => {
+    const pairs = getFlotPairs({ rows: table.rows, xIndex: 0, yIndex: 2 });
+
+    expect(pairs.length).toEqual(3);
+    expect(pairs[0].length).toEqual(2);
+    expect(pairs[0][0]).toEqual(1);
+    expect(pairs[0][1]).toEqual('a');
+  });
+});

packages/grafana-ui/src/utils/flotPairs.ts

+// Types
+import { NullValueMode } from '../types/index';
+
+export interface FloatPairsOptions {
+  rows: any[][];
+  xIndex: number;
+  yIndex: number;
+  nullValueMode?: NullValueMode;
+}
+
+export function getFlotPairs({ rows, xIndex, yIndex, nullValueMode }: FloatPairsOptions): any[][] {
+  const ignoreNulls = nullValueMode === NullValueMode.Ignore;
+  const nullAsZero = nullValueMode === NullValueMode.AsZero;
+
+  const pairs: any[][] = [];
+
+  for (let i = 0; i < rows.length; i++) {
+    const x = rows[i][xIndex];
+    let y = rows[i][yIndex];
+
+    if (y === null) {
+      if (ignoreNulls) {
+        continue;
+      }
+      if (nullAsZero) {
+        y = 0;
+      }
+    }
+
+    // X must be a value
+    if (x === null) {
+      continue;
+    }
+
+    pairs.push([x, y]);
+  }
+  return pairs;
+}

packages/grafana-ui/src/utils/processTimeSeries.ts

@@ -4,6 +4,7 @@ import isNumber from 'lodash/isNumber';
 import { colors } from './colors';
 
 // Types
+import { getFlotPairs } from './flotPairs';
 import { TimeSeriesVMs, NullValueMode, TimeSeriesValue, TableData } from '../types';
 
 interface Options {
@@ -34,7 +35,14 @@ export function processTimeSeries({ data, xColumn, yColumn, nullValueMode }: Opt
 
     const colorIndex = index % colors.length;
     const label = item.columns[yColumn].text;
-    const result = [];
+
+    // Use external calculator just to make sure it works :)
+    const result = getFlotPairs({
+      rows: item.rows,
+      xIndex: xColumn,
+      yIndex: yColumn,
+      nullValueMode,
+    });
 
     // stat defaults
     let total = 0;
@@ -137,8 +145,6 @@ export function processTimeSeries({ data, xColumn, yColumn, nullValueMode }: Opt
           allIsZero = false;
         }
       }
-
-      result.push([currentTime, currentValue]);
     }
 
     if (max === -Number.MAX_VALUE) {