tweaks to make ticks not be terrible

examples/market_hours/main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	start := time.Date(2016, 07, 04, 12, 0, 0, 0, chart.Date.Eastern())
+	end := time.Date(2016, 07, 06, 12, 0, 0, 0, chart.Date.Eastern())
+	xv := chart.Sequence.MarketHours(start, end, chart.NYSEOpen, chart.NYSEClose, chart.Date.IsNYSEHoliday)
+	yv := chart.Sequence.RandomWithAverage(len(xv), 200, 10)
+
+	graph := chart.Chart{
+		XAxis: chart.XAxis{
+			Style:          chart.StyleShow(),
+			TickPosition:   chart.TickPositionBetweenTicks,
+			ValueFormatter: chart.TimeHourValueFormatter,
+			Range: &chart.MarketHoursRange{
+				MarketOpen:      chart.NYSEOpen,
+				MarketClose:     chart.NYSEClose,
+				HolidayProvider: chart.Date.IsNYSEHoliday,
+			},
+		},
+		YAxis: chart.YAxis{
+			Style: chart.StyleShow(),
+		},
+		Series: []chart.Series{
+			chart.TimeSeries{
+				XValues: xv,
+				YValues: yv,
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	graph.Render(chart.PNG, res)
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	http.ListenAndServe(":8080", nil)
+}