滚轮可以更快了。

src/index.js

@@ -217,10 +217,10 @@ export default class StockHeatmap extends React.Component {
     let l = 0, l2 = 0;
     switch (direction) {
       case 'zoom-in':
-        l = Math.max(this.windowLength - 16, 3);
+        l = Math.max(this.windowLength - 25, 10);
         break;
       case 'zoom-out':
-        l = Math.min(this.windowLength + 16, this.data.length - 16);
+        l = Math.min(this.windowLength + 25, this.data.length);
         break;
     }
     l2 = this.windowLength - l;

src/utils.js

@@ -51,7 +51,7 @@ export const extractMaxVolume = (data) => {
  */
 export const extractMaxTradedVolume = (data) => {
   let vols = data.map(d => {
-    if (d.marketDepth) return +d.marketDepth.lastTradedQty;
+    if (d.marketDepth) return +d.marketDepth.lastBuyQty > +d.marketDepth.lastSellQty ? +d.marketDepth.lastBuyQty : +d.marketDepth.lastSellQty;
     else return 0;
   }).sort((a, b) => a - b);
   if (vols.length > 0) return vols[vols.length - 1];