lint fixes

client/src/components/continuous/continuous.js

@@ -5,17 +5,8 @@ import React from "react";
 import _ from "lodash";
 import { connect } from "react-redux";
 
-import styles from "./parallelCoordinates.css";
-import SectionHeader from "../framework/sectionHeader";
-
-import setupParallelCoordinates from "./setupParallelCoordinates";
-import drawAxes from "./drawAxes";
-import drawLinesCanvas from "./drawLinesCanvas";
-
 import HistogramBrush from "./histogramBrush";
 
-import { margin, width, height, createDimensions } from "./util";
-
 @connect(state => {
   const metadata = _.get(state.controls.world, "obsAnnotations", null);
   const ranges = _.get(state.controls.world, "summary.obs", null);
@@ -29,35 +20,29 @@ import { margin, width, height, createDimensions } from "./util";
   };
 })
 class Continuous extends React.Component {
-  constructor(props) {
-    super(props);
-    this.state = {
-      svg: null,
-      ctx: null,
-      axes: null,
-      dimensions: null
-    };
-  }
-
   handleBrushAction(selection) {
-    this.props.dispatch({
+    const { dispatch } = this.props;
+    dispatch({
       type: "continuous selection using parallel coords brushing",
       data: selection
     });
   }
 
   handleColorAction(key) {
-    this.props.dispatch({
+    const { dispatch, ranges } = this.props;
+    dispatch({
       type: "color by continuous metadata",
       colorAccessor: key,
-      rangeMaxForColorAccessor: this.props.ranges[key].range.max
+      rangeMaxForColorAccessor: ranges[key].range.max
     });
   }
 
   render() {
+    const { ranges } = this.props;
+
     return (
       <div>
-        {_.map(this.props.ranges, (value, key) => {
+        {_.map(ranges, (value, key) => {
           const isColorField = key.includes("color") || key.includes("Color");
           if (value.range && key !== "name" && !isColorField) {
             return (
@@ -68,6 +53,7 @@ class Continuous extends React.Component {
               />
             );
           }
+          return null;
         })}
       </div>
     );
@@ -75,5 +61,3 @@ class Continuous extends React.Component {
 }
 
 export default Continuous;
-
-// <SectionHeader text="Continuous Metadata"/>

client/src/components/continuous/drawAxes.js

@@ -1,4 +1,5 @@
 // jshint esversion: 6
+import * as d3 from "d3";
 import styles from "./parallelCoordinates.css";
 import { yAxis, brushstart } from "./util";
 
@@ -19,13 +20,11 @@ const drawAxes = (
   ******************************************/
 
   function brush() {
-    var actives = [];
+    const actives = [];
     svg
       .selectAll(".parcoords_axis .parcoords_brush")
-      .filter(function(d) {
-        return d3.brushSelection(this);
-      })
-      .each(function(d) {
+      .filter(() => d3.brushSelection(this))
+      .each(d => {
         actives.push({
           dimension: d,
           extent: d3.brushSelection(this)
@@ -35,20 +34,18 @@ const drawAxes = (
     handleBrushAction(actives);
   }
 
-  var axes = svg
+  const axes = svg
     .selectAll(".parcoords_axis")
     .data(dimensions)
     .enter()
     .append("g")
     .attr("class", `${styles.axis} parcoords_axis`)
-    .attr("transform", (d, i) => {
-      return "translate(" + xscale(i) + ")";
-    });
+    .attr("transform", (d, i) => `translate(${xscale(i)})`);
 
   axes
     .append("g")
-    .each(function(d) {
-      var renderAxis =
+    .each(d => {
+      const renderAxis =
         "axis" in d
           ? d.axis.scale(d.scale) // custom axis
           : yAxis.scale(d.scale); // default axis
@@ -60,15 +57,13 @@ const drawAxes = (
     })
     .attr("class", styles.title)
     .attr("text-anchor", "start")
-    .text(function(d) {
-      return "description" in d ? d.description + "  🖌️" : d.key + "  🖌️";
-    });
+    .text(d => ("description" in d ? `${d.description}  🖌️` : `${d.key}  🖌️`));
 
   // Add and store a brush for each axis.
   axes
     .append("g")
     .attr("class", `${styles.brush} parcoords_brush`)
-    .each(function(d) {
+    .each(d => {
       d3.select(this).call(
         (d.brush = d3
           .brushY()

client/src/components/continuous/drawLinesCanvas.js

@@ -10,54 +10,46 @@ import renderQueue from "../../util/renderQueue";
 ******************************************
 ******************************************/
 
-const drawLinesCanvas = (
-  ctx,
-  dimensions,
-  xscale,
-  colorAccessor,
-  colorScale
-) => {
-  return d => {
-    ctx.globalAlpha = 0.1;
+const drawLinesCanvas = (ctx, dimensions, xscale) => d => {
+  ctx.globalAlpha = 0.1;
 
-    if (d["__selected__"]) {
-      ctx.strokeStyle = d["__color__"];
-    } else {
+  if (d.__selected__) {
+    ctx.strokeStyle = d.__color__;
+  } else {
+    return;
+  }
+
+  ctx.beginPath();
+  const coords = project(d, dimensions, xscale);
+  coords.forEach((p, i) => {
+    // this tricky bit avoids rendering null values as 0
+    if (p === null) {
+      // this bit renders horizontal lines on the previous/next
+      // dimensions, so that sandwiched null values are visible
+      if (i > 0) {
+        const prev = coords[i - 1];
+        if (prev !== null) {
+          ctx.moveTo(prev[0], prev[1]);
+          ctx.lineTo(prev[0] + 6, prev[1]);
+        }
+      }
+      if (i < coords.length - 1) {
+        const next = coords[i + 1];
+        if (next !== null) {
+          ctx.moveTo(next[0] - 6, next[1]);
+        }
+      }
       return;
     }
 
-    ctx.beginPath();
-    var coords = project(d, dimensions, xscale);
-    coords.forEach((p, i) => {
-      // this tricky bit avoids rendering null values as 0
-      if (p === null) {
-        // this bit renders horizontal lines on the previous/next
-        // dimensions, so that sandwiched null values are visible
-        if (i > 0) {
-          var prev = coords[i - 1];
-          if (prev !== null) {
-            ctx.moveTo(prev[0], prev[1]);
-            ctx.lineTo(prev[0] + 6, prev[1]);
-          }
-        }
-        if (i < coords.length - 1) {
-          var next = coords[i + 1];
-          if (next !== null) {
-            ctx.moveTo(next[0] - 6, next[1]);
-          }
-        }
-        return;
-      }
+    if (i === 0) {
+      ctx.moveTo(p[0], p[1]);
+      return;
+    }
 
-      if (i == 0) {
-        ctx.moveTo(p[0], p[1]);
-        return;
-      }
-
-      ctx.lineTo(p[0], p[1]);
-    });
-    ctx.stroke();
-  };
+    ctx.lineTo(p[0], p[1]);
+  });
+  ctx.stroke();
 };
 
 const drawCellLinesUsingRenderQueue = (

client/src/components/continuous/histogramBrush.js

@@ -12,14 +12,12 @@ import * as d3 from "d3";
 import memoize from "memoize-one";
 import * as globals from "../../globals";
 
-@connect(state => {
-  return {
-    initializeRanges: _.get(state.controls.world, "summary.obs"),
-    colorAccessor: state.controls.colorAccessor,
-    colorScale: state.controls.colorScale,
-    obsAnnotations: _.get(state.controls.world, "obsAnnotations", null)
-  };
-})
+@connect(state => ({
+  initializeRanges: _.get(state.controls.world, "summary.obs"),
+  colorAccessor: state.controls.colorAccessor,
+  colorScale: state.controls.colorScale,
+  obsAnnotations: _.get(state.controls.world, "obsAnnotations", null)
+}))
 class HistogramBrush extends React.Component {
   calcHistogramCache = memoize((obsAnnotations, metadataField, ranges) => {
     // recalculate expensive stuff
@@ -101,18 +99,10 @@ class HistogramBrush extends React.Component {
       .enter()
       .append("rect")
       .attr("class", "bar")
-      .attr("x", function(d) {
-        return x(d.x0) + 1;
-      })
-      .attr("y", function(d) {
-        return y(d.length / numValues);
-      })
-      .attr("width", function(d) {
-        return Math.abs(x(d.x1) - x(d.x0) - 1);
-      })
-      .attr("height", function(d) {
-        return y(0) - y(d.length / numValues);
-      });
+      .attr("x", d => x(d.x0) + 1)
+      .attr("y", d => y(d.length / numValues))
+      .attr("width", d => Math.abs(x(d.x1) - x(d.x0) - 1))
+      .attr("height", d => y(0) - y(d.length / numValues));
 
     if (!this.state.brush && !this.state.axis) {
       const brush = d3
@@ -122,20 +112,14 @@ class HistogramBrush extends React.Component {
         .call(
           d3
             .brushX()
-            .on(
-              "end",
-              this.onBrush(this.props.metadataField, x.invert).bind(this)
-            )
+            .on("end", this.onBrush(metadataField, x.invert).bind(this))
         );
 
       const xAxis = d3
         .select(svgRef)
         .append("g")
         .attr("class", "axis axis--x")
-        .attr(
-          "transform",
-          "translate(0," + (this.height - this.marginBottom) + ")"
-        )
+        .attr("transform", `translate(0,${this.height - this.marginBottom})`)
         .call(d3.axisBottom(x).ticks(5))
         .append("text")
         .attr("x", this.width - 2)
@@ -143,30 +127,30 @@ class HistogramBrush extends React.Component {
         .attr("fill", "#000")
         .attr("text-anchor", "end")
         .attr("font-weight", "bold")
-        .text(this.props.metadataField);
+        .text(metadataField);
 
       this.setState({ brush, xAxis });
     }
   }
 
   handleColorAction() {
-    this.props.dispatch({
+    const { dispatch, metadataField, initializeRanges } = this.props;
+    dispatch({
       type: "color by continuous metadata",
-      colorAccessor: this.props.metadataField,
-      rangeMaxForColorAccessor: this.props.initializeRanges[
-        this.props.metadataField
-      ].range.max
+      colorAccessor: metadataField,
+      rangeMaxForColorAccessor: initializeRanges[metadataField].range.max
     });
   }
 
   render() {
+    const { metadataField, ranges, colorAccessor } = this.props;
     return (
       <div
         style={{
           marginTop: 10,
           position: "flex"
         }}
-        id={"histogram_" + this.props.metadataField}
+        id={`histogram_${metadataField}`}
       >
         <svg
           width={this.width}
@@ -175,9 +159,9 @@ class HistogramBrush extends React.Component {
             this.drawHistogram(svgRef);
           }}
         >
-          {this.props.ranges.min}
+          {ranges.min}
           {" to "}
-          {this.props.ranges.max}
+          {ranges.max}
         </svg>
         <span
           onClick={this.handleColorAction.bind(this)}
@@ -187,9 +171,7 @@ class HistogramBrush extends React.Component {
             // padding: this.props.colorAccessor === this.props.metadataField ? 3 : "auto",
             borderRadius: 3,
             color:
-              this.props.colorAccessor === this.props.metadataField
-                ? globals.brightBlue
-                : "black",
+              colorAccessor === metadataField ? globals.brightBlue : "black",
             // backgroundColor: this.props.colorAccessor === this.props.metadataField ? globals.brightBlue : "inherit",
             position: "relative",
             top: -29,

client/src/components/continuous/setupParallelCoordinates.js

@@ -4,26 +4,28 @@
 ******************************************
 ******************************************/
 // jshint esversion: 6
-const setupParallelCoordinates = (width, height, margin) => {
-  var container = d3.select("#parcoords");
+import * as d3 from "d3";
 
-  var svg = container
+const setupParallelCoordinates = (width, height, margin) => {
+  const container = d3.select("#parcoords");
+
+  const svg = container
     .append("svg")
     .attr("width", width + margin.left + margin.right)
     .attr("height", height + margin.top + margin.bottom)
     .append("g")
-    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
+    .attr("transform", `translate(${margin.left},${margin.top})`);
 
-  var canvas = container
+  const canvas = container
     .append("canvas")
     .attr("width", width * devicePixelRatio)
     .attr("height", height * devicePixelRatio)
-    .style("width", width + "px")
-    .style("height", height + "px")
-    .style("margin-top", margin.top + "px")
-    .style("margin-left", margin.left + "px");
+    .style("width", `${width}px`)
+    .style("height", `${height}px`)
+    .style("margin-top", `${margin.top}px`)
+    .style("margin-left", `${margin.left}px`);
 
-  var ctx = canvas.node().getContext("2d");
+  const ctx = canvas.node().getContext("2d");
   ctx.globalCompositeOperation = "darken";
   ctx.globalAlpha = 0.15;
   ctx.lineWidth = 1.5;

client/src/components/continuous/util.js

@@ -18,11 +18,10 @@ export const createDimensions = data => {
   _.each(data, (value, key) => {
     if (value.range) {
       newArr.push({
-        key: key /* room for confusion: lodash calls this key, it's also the name of the property parallel coords code is looking for */,
+        key /* room for confusion: lodash calls this key, it's also the name of the property parallel coords code is looking for */,
         type: {
-          within: (d, extent, dim) => {
-            return extent[0] <= dim.scale(d) && dim.scale(d) <= extent[1];
-          }
+          within: (d, extent, dim) =>
+            extent[0] <= dim.scale(d) && dim.scale(d) <= extent[1]
         },
         scale: d3
           .scaleSqrt()
@@ -41,18 +40,13 @@ export const brushstart = () => {
 };
 
 export const d3_functor = v => {
-  return typeof v === "function"
-    ? v
-    : () => {
-        return v;
-      };
+  return typeof v === "function" ? v : () => v;
 };
 
-export const project = (d, dimensions, xscale) => {
-  return dimensions.map((p, i) => {
+export const project = (d, dimensions, xscale) =>
+  dimensions.map((p, i) => {
     // check if data element has property and contains a value
     if (!(p.key in d) || d[p.key] === null) return null;
 
     return [xscale(i), p.scale(d[p.key])];
   });
-};