Merge pull request #1805 from influxdata/fix/graph-fixes

Graph Fixes for Bar Graphs and Add Hash-based Colors

CHANGELOG.md

@@ -10,6 +10,9 @@
 
 ### UI Improvements
 1. [#1796](https://github.com/influxdata/chronograf/pull/1796): Add spinner to indicate data is being written
+1. [#1800](https://github.com/influxdata/chronograf/pull/1796): Embiggen text area for line protocol manual entry in Data Explorer's Write Data overlay
+1. [#1805](https://github.com/influxdata/chronograf/pull/1805): Fix bar graphs overlapping
+1. [#1805](https://github.com/influxdata/chronograf/pull/1805): Add series names hashing so that graph colors should stay the same for the same series across charts
 1. [#1800](https://github.com/influxdata/chronograf/pull/1800): Embiggen text area for line protocol manual entry in Data Explorer's Write Data overlay
 1. [#1812](https://github.com/influxdata/chronograf/pull/1812): Improve error message when request for Status Page News Feed fails
 

ui/src/shared/components/Dygraph.js

@@ -11,6 +11,12 @@ import {LINE_COLORS, multiColumnBarPlotter} from 'src/shared/graphs/helpers'
 import DygraphLegend from 'src/shared/components/DygraphLegend'
 import {buildYLabel} from 'shared/presenters'
 
+const hasherino = (str, len) =>
+  str
+    .split('')
+    .map(char => char.charCodeAt(0))
+    .reduce((hash, code) => hash + code, 0) % len
+
 export default class Dygraph extends Component {
   constructor(props) {
     super(props)
@@ -80,17 +86,25 @@ export default class Dygraph extends Component {
 
     const graphRef = this.graphRef
     const legendRef = this.legendRef
-    let finalLineColors = overrideLineColors
+    const finalLineColors = [...(overrideLineColors || LINE_COLORS)]
 
-    if (finalLineColors === null) {
-      finalLineColors = LINE_COLORS
+    const hashColorDygraphSeries = {}
+    const {length} = finalLineColors
+
+    for (const seriesName in dygraphSeries) {
+      const series = dygraphSeries[seriesName]
+      const hashIndex = hasherino(seriesName, length)
+      const color = finalLineColors[hashIndex]
+      hashColorDygraphSeries[seriesName] = {...series, color}
     }
 
     const yAxis = _.get(axes, ['y', 'bounds'], [null, null])
     const y2Axis = _.get(axes, ['y2', 'bounds'], undefined)
 
     const defaultOptions = {
-      plugins: [
+      plugins: isBarGraph
+        ? []
+        : [
             new Dygraphs.Plugins.Crosshair({
               direction: 'vertical',
             }),
@@ -103,12 +117,11 @@ export default class Dygraph extends Component {
       fillGraph: isGraphFilled,
       axisLineWidth: 2,
       gridLineWidth: 1,
-      highlightCircleSize: 3,
+      highlightCircleSize: isBarGraph ? 0 : 3,
       animatedZooms: true,
       hideOverlayOnMouseOut: false,
       colors: finalLineColors,
-      series: dygraphSeries,
-      ylabel: this.getLabel('y'),
+      series: hashColorDygraphSeries,
       axes: {
         y: {
           valueRange: getRange(timeSeries, yAxis, ruleValues),
@@ -119,7 +132,7 @@ export default class Dygraph extends Component {
       },
       highlightSeriesOpts: {
         strokeWidth: 2,
-        highlightCircleSize: 5,
+        highlightCircleSize: isBarGraph ? 0 : 5,
       },
       legendFormatter: legend => {
         if (!legend.x) {
@@ -259,6 +272,7 @@ export default class Dygraph extends Component {
       dygraphSeries,
       ruleValues,
       isBarGraph,
+      overrideLineColors,
     } = this.props
 
     const dygraph = this.dygraph
@@ -272,6 +286,17 @@ export default class Dygraph extends Component {
     const y2 = _.get(axes, ['y2', 'bounds'], undefined)
     const timeSeries = this.getTimeSeries()
     const ylabel = this.getLabel('y')
+    const finalLineColors = [...(overrideLineColors || LINE_COLORS)]
+
+    const hashColorDygraphSeries = {}
+    const {length} = finalLineColors
+
+    for (const seriesName in dygraphSeries) {
+      const series = dygraphSeries[seriesName]
+      const hashIndex = hasherino(seriesName, length)
+      const color = finalLineColors[hashIndex]
+      hashColorDygraphSeries[seriesName] = {...series, color}
+    }
 
     const updateOptions = {
       labels,
@@ -288,7 +313,8 @@ export default class Dygraph extends Component {
       stepPlot: options.stepPlot,
       stackedGraph: options.stackedGraph,
       underlayCallback: options.underlayCallback,
-      series: dygraphSeries,
+      colors: finalLineColors,
+      series: hashColorDygraphSeries,
       plotter: isBarGraph ? multiColumnBarPlotter : null,
       visibility: this.visibility(),
     }

ui/src/shared/graphs/helpers.js

@@ -26,7 +26,7 @@ export const darkenColor = colorStr => {
   return `rgb(${color.r},${color.g},${color.b})`
 }
 
-// Bar Graph code below is from http://dygraphs.com/tests/plotters.html
+// Bar Graph code below is adapted from http://dygraphs.com/tests/plotters.html
 export const multiColumnBarPlotter = e => {
   // We need to handle all the series simultaneously.
   if (e.seriesIndex !== 0) {
@@ -51,24 +51,34 @@ export const multiColumnBarPlotter = e => {
     }
   }
 
-  const barWidth = Math.floor(2.0 / 3 * minSep)
+  // calculate bar width using some graphics math while
+  // ensuring a bar is never smaller than one px, so it is always rendered
+  const barWidth = Math.max(Math.floor(2.0 / 3.0 * minSep), 1.0)
 
   const fillColors = []
   const strokeColors = g.getColors()
+
+  let selPointX
+  if (g.selPoints_ && g.selPoints_.length) {
+    selPointX = g.selPoints_[0].canvasx
+  }
+
   for (let i = 0; i < strokeColors.length; i++) {
     fillColors.push(darkenColor(strokeColors[i]))
   }
 
+  ctx.lineWidth = 2
+
   for (let j = 0; j < sets.length; j++) {
-    ctx.fillStyle = fillColors[j]
     ctx.strokeStyle = strokeColors[j]
     for (let i = 0; i < sets[j].length; i++) {
       const p = sets[j][i]
       const centerX = p.canvasx
+      ctx.fillStyle = fillColors[j]
       const xLeft =
         sets.length === 1
-          ? centerX - barWidth / 2
-          : centerX - barWidth / 2 * (1 - j / (sets.length - 1))
+          ? centerX - barWidth
+          : centerX - barWidth * (1 - j / sets.length)
 
       ctx.fillRect(
         xLeft,
@@ -77,6 +87,8 @@ export const multiColumnBarPlotter = e => {
         yBottom - p.canvasy
       )
 
+      // hover highlighting
+      if (selPointX === centerX) {
         ctx.strokeRect(
           xLeft,
           p.canvasy,
@@ -86,3 +98,4 @@ export const multiColumnBarPlotter = e => {
       }
     }
   }
+}