Handle 0/1 data items returned before resampling

cointop/chart.go

@@ -172,15 +172,17 @@ func (ct *Cointop) ChartPoints(symbol string, name string) error {
 		}
 	}
 
+	var labels []string
+	var data []float64
+	timeQuantum := timedata.CalculateTimeQuantum(cacheData) // will be 0 if <2 points
+	if timeQuantum > 0 {
 		// Resample cachedata
-	timeQuantum := timedata.CalculateTimeQuantum(cacheData)
 		newStart := cacheData[0][0] // use the first data point
 		newEnd := time.Unix(end, 0).Add(-timeQuantum)
 		timeData := timedata.ResampleTimeSeriesData(cacheData, newStart, float64(newEnd.UnixMilli()), chart.GetChartDataSize(maxX))
-	labels := timedata.BuildTimeSeriesLabels(timeData)
+		labels = timedata.BuildTimeSeriesLabels(timeData)
 
 		// Extract just the values from the data
-	var data []float64
 		for i := range timeData {
 			value := timeData[i][1]
 			if math.IsNaN(value) {
@@ -188,6 +190,7 @@ func (ct *Cointop) ChartPoints(symbol string, name string) error {
 			}
 			data = append(data, value)
 		}
+	}
 
 	chart.SetData(data)
 	chart.SetDataLabels(labels)
@@ -282,12 +285,15 @@ func (ct *Cointop) PortfolioChart() error {
 			break // use the first one
 		}
 	}
+
+	// If there is data, resample and sum
+	var data []float64
+	var labels []string
+	if timeQuantum > 0 {
 		newStart := time.Unix(start, 0).Add(timeQuantum)
 		newEnd := time.Unix(end, 0).Add(-timeQuantum)
 
 		// Resample and sum data
-	var data []float64
-	var labels []string
 		for i, cacheData := range allCacheData {
 			coinData := timedata.ResampleTimeSeriesData(cacheData.data, float64(newStart.UnixMilli()), float64(newEnd.UnixMilli()), chart.GetChartDataSize(maxX))
 			if i == 0 {
@@ -317,6 +323,7 @@ func (ct *Cointop) PortfolioChart() error {
 				}
 			}
 		}
+	}
 
 	chart.SetData(data)
 	chart.SetDataLabels(labels)