updated

src/DataManipulator.ts

@@ -1,20 +1,33 @@
 import { ServerRespond } from './DataStreamer';
 
 export interface Row {
-  stock: string,
-  top_ask_price: number,
+  price_abc:number,
+  price_def:number,
+  ratio: number,
   timestamp: Date,
+  upper_bound:number,
+  lower_bound:number,
+  trigger_alert:number | undefined,
 }
 
 
 export class DataManipulator {
-  static generateRow(serverResponds: ServerRespond[]) {
-    return serverResponds.map((el: any) => {
-      return {
-        stock: el.stock,
-        top_ask_price: el.top_ask && el.top_ask.price || 0,
-        timestamp: el.timestamp,
+  static generateRow(serverResponds: ServerRespond[]) :Row{
+    const priceABC=(serverRespond[0].top_ask.price+serverRespond[0].top_bid_price)/2;
+    const priceDEF=(serverRespond[1].top_ask.price+serverRespond[1].top_bid_price)/2;
+    const ratio= priceABC/priceDEF;
+    const upperBound=1+0.05;
+    const lowerBound=1-0.05;
+          return {
+            price_abc:priceABC,
+            price_def:priceDEF,
+            ratio,
+            timestamp:serverRespond[0].timestamp>serverRespond[1].timestamp?
+              serverRespond[0].temestamp:serverRespond[1].timestamp,
+            upper_bound:upperBound,
+            lower_bound:lowerBound,
+            trigger_alert:(ratio > upperBound || ratio<lowerBound)?ratio:undefined,
+
       };
-    })
   }
 }

src/Graph.tsx

@@ -23,10 +23,13 @@ class Graph extends Component<IProps, {}> {
     const elem = document.getElementsByTagName('perspective-viewer')[0] as unknown as PerspectiveViewerElement;
 
     const schema = {
-      stock: 'string',
-      top_ask_price: 'float',
-      top_bid_price: 'float',
-      timestamp: 'date',
+      price_abc:'float',
+      price_def:'float',
+      ratio:'float',
+      timestamp:'date',
+      upper_bound:'float',
+      lower_bound:'float',
+      trigger_alert:'float',
     };
 
     if (window.perspective && window.perspective.worker()) {
@@ -36,23 +39,26 @@ class Graph extends Component<IProps, {}> {
       // Load the `table` in the `<perspective-viewer>` DOM reference.
       elem.load(this.table);
       elem.setAttribute('view', 'y_line');
-      elem.setAttribute('column-pivots', '["stock"]');
       elem.setAttribute('row-pivots', '["timestamp"]');
-      elem.setAttribute('columns', '["top_ask_price"]');
+      elem.setAttribute('columns', '["ratio","lower_bound","upper_bound","trigger_alert"]');
       elem.setAttribute('aggregates', JSON.stringify({
-        stock: 'distinctcount',
-        top_ask_price: 'avg',
-        top_bid_price: 'avg',
+        price_abc: 'avg',
+        price_def: 'avg',
+        ratio:'avg',
         timestamp: 'distinct count',
+        upper_bound:'avg',
+        lower_bound:'avg',
+        trigger_alert:'avg',
       }));
     }
   }
 
   componentDidUpdate() {
     if (this.table) {
-      this.table.update(
+      this.table.update([
         DataManipulator.generateRow(this.props.data),
-      );
+      ] as unknown as TableData);
+
     }
   }
 }