examples, some fixes

examples/custom_ticks/main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	/*
+	   In this example we set a custom set of ticks to use for the y-axis. It can be (almost) whatever you want, including some custom labels for ticks.
+	   Custom ticks will supercede a custom range, which will supercede automatic generation based on series values.
+	*/
+
+	graph := chart.Chart{
+		YAxis: chart.YAxis{
+			Style: chart.Style{
+				Show: true,
+			},
+			Range: chart.Range{
+				Min: 0.0,
+				Max: 4.0,
+			},
+			Ticks: []chart.Tick{
+				{0.0, "0.00"},
+				{2.0, "2.00"},
+				{4.0, "4.00"},
+				{6.0, "6.00"},
+				{8.0, "Eight"},
+				{10.0, "Ten"},
+			},
+		},
+		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},
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	graph.Render(chart.PNG, res)
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	http.ListenAndServe(":8080", nil)
+}