basics of stacked bar.

examples/stacked_bar/main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	sbc := chart.StackedBarChart{
+		Background: chart.Style{
+			Padding: chart.Box{Top: 50, Left: 50, Right: 50, Bottom: 50},
+		},
+		Bars: []chart.StackedBar{
+			{
+				Values: []chart.Value{
+					{Value: 5, Label: "Blue"},
+					{Value: 5, Label: "Green"},
+					{Value: 4, Label: "Gray"},
+					{Value: 4, Label: "Orange"},
+					{Value: 3, Label: "Test"},
+					{Value: 3, Label: "??"},
+					{Value: 1, Label: "!!"},
+				},
+			},
+			{
+				Values: []chart.Value{
+					{Value: 10, Label: "Blue"},
+					{Value: 5, Label: "Green"},
+					{Value: 1, Label: "Gray"},
+				},
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/svg+xml")
+	err := sbc.Render(chart.SVG, res)
+	if err != nil {
+		fmt.Printf("Error rendering chart: %v\n", err)
+	}
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}