[WIP DO NOT MERGE] correctly display graph legend for negative continuous metadata (#620)

correctly display graph legend for negative continuous metadata

client/src/components/brushableHistogram/index.js

@@ -146,7 +146,7 @@ class HistogramBrush extends React.Component {
       dispatch({
         type: "color by continuous metadata",
         colorAccessor: field,
-        rangeMaxForColorAccessor: ranges.max
+        rangeForColorAccessor: ranges
       });
     } else if (world.varData.hasCol(field)) {
       dispatch(actions.requestSingleGeneExpressionCountsForColoringPOST(field));

client/src/components/continuous/continuous.js

@@ -33,7 +33,7 @@ class Continuous extends React.Component {
       dispatch({
         type: "color by continuous metadata",
         colorAccessor: key,
-        rangeMaxForColorAccessor: summary.max
+        rangeForColorAccessor: summary
       });
     };
   }

client/src/middleware/updateCellColors.js

@@ -82,7 +82,7 @@ const updateCellColorsMiddleware = store => next => action => {
 
   if (action.type === "color by continuous metadata") {
     const colorBins = 100;
-    const [min, max] = [0, action.rangeMaxForColorAccessor];
+    const { min, max } = action.rangeForColorAccessor;
     colorScale = d3
       .scaleQuantile()
       .domain([min, max])