can rotate text + add y axis names

_examples/twoaxis/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+
+	/*
+	   In this example we add a second series, and assign it to the secondary y axis, giving that series it's own range.
+
+	   We also enable all of the axes by setting the `Show` propery of their respective styles to `true`.
+	*/
+
+	graph := chart.Chart{
+		XAxis: chart.XAxis{
+			Style: chart.Style{
+				Show: true, //enables / displays the x-axis
+			},
+		},
+		YAxis: chart.YAxis{
+			Style: chart.Style{
+				Show: true, //enables / displays the y-axis
+			},
+		},
+		YAxisSecondary: chart.YAxis{
+			Style: chart.Style{
+				Show: true, //enables / displays the secondary y-axis
+			},
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+			chart.ContinuousSeries{
+				YAxis:   chart.YAxisSecondary,
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{50.0, 40.0, 30.0, 20.0, 10.0},
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	graph.Render(chart.PNG, res)
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	http.ListenAndServe(":8080", nil)
+}