Initial commit of details_box.go and example

examples/details_box/main.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"math/rand"
+	"os"
+	"time"
+
+	chart "github.com/wcharczuk/go-chart"
+)
+
+func random(min, max float64) float64 {
+	return rand.Float64()*(max-min) + min
+}
+
+func main() {
+	/*
+		This is an example of using `DetailsBox` to add a box with additional
+		information about the graph.
+	*/
+	xValues := make([]time.Time, 0)
+	yValues := make([][]float64, 3)
+	for i := 0; i < 50; i++ {
+		xValues = append(xValues, time.Now().Add(time.Duration(i)*time.Minute))
+
+		for j := 0; j < 3; j++ {
+			yValues[j] = append(yValues[j], random(float64(0), float64(20)))
+		}
+	}
+
+	   	seriesOne := chart.TimeSeries{
+	   		Name:    "Series One",
+	   		XValues: xValues,
+	   		YValues: yValues[0],
+	   	}
+
+	   	seriesTwo := chart.TimeSeries{
+	   		Name:    "Series Two",
+	   		XValues: xValues,
+	   		YValues: yValues[1],
+		   }
+
+		seriesThree := chart.TimeSeries{
+			Name: "Series Three",
+			XValues: xValues,
+			YValues: yValues[2],
+		}
+
+	graph := chart.Chart{
+		Series: []chart.Series{
+			seriesOne,
+			seriesTwo,
+			seriesThree,
+		},
+		Background: chart.Style{
+			Padding: chart.Box{
+				Left: 120,
+			},
+		},
+	}
+
+	graph.Elements = []chart.Renderable{
+		chart.LegendLeft(&graph),
+		chart.DetailsBox(&graph, []string{
+			"M-F 8:00 am - 6:00 pm",
+			"Poll for data every 9 min.",
+		}),
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}