refactor: enhance chart render function

examples/charts/main.go

@@ -73,6 +73,7 @@ func handler(w http.ResponseWriter, req *http.Request, chartOptions []charts.Cha
 	bytesList := make([][]byte, 0)
 	for _, opt := range chartOptions {
 		opt.Theme = theme
+		opt.Type = charts.ChartOutputSVG
 		d, err := charts.Render(opt)
 		if err != nil {
 			panic(err)
@@ -1055,6 +1056,64 @@ func echartsHandler(w http.ResponseWriter, req *http.Request) {
 				}
 			]
 		}`,
+		`{
+			"title": {
+				"text": "World Population"
+			},
+			"tooltip": {
+				"trigger": "axis",
+				"axisPointer": {
+					"type": "shadow"
+				}
+			},
+			"legend": {},
+			"grid": {
+				"left": "3%",
+				"right": "4%",
+				"bottom": "3%",
+				"containLabel": true
+			},
+			"xAxis": {
+				"type": "value"
+			},
+			"yAxis": {
+				"type": "category",
+				"data": [
+					"Brazil",
+					"Indonesia",
+					"USA",
+					"India",
+					"China",
+					"World"
+				]
+			},
+			"series": [
+				{
+					"name": "2011",
+					"type": "bar",
+					"data": [
+						18203,
+						23489,
+						29034,
+						104970,
+						131744,
+						630230
+					]
+				},
+				{
+					"name": "2012",
+					"type": "bar",
+					"data": [
+						19325,
+						23438,
+						31000,
+						121594,
+						134141,
+						681807
+					]
+				}
+			]
+		}`,
 		`{
 			"title": {
 				"text": "Rainfall vs Evaporation",