refactor: add example for chinese

examples/chinese/main.go

@@ -0,0 +1,118 @@
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/vicanso/go-charts"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "chinese-line-chart.png")
+	err = ioutil.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	// 字体文件需要自行下载
+	buf, err := ioutil.ReadFile("../NotoSansSC.ttf")
+	if err != nil {
+		panic(err)
+	}
+	err = charts.InstallFont("noto", buf)
+	if err != nil {
+		panic(err)
+	}
+
+	values := [][]float64{
+		{
+			120,
+			132,
+			101,
+			134,
+			90,
+			230,
+			210,
+		},
+		{
+			220,
+			182,
+			191,
+			234,
+			290,
+			330,
+			310,
+		},
+		{
+			150,
+			232,
+			201,
+			154,
+			190,
+			330,
+			410,
+		},
+		{
+			320,
+			332,
+			301,
+			334,
+			390,
+			330,
+			320,
+		},
+		{
+			820,
+			932,
+			901,
+			934,
+			1290,
+			1330,
+			1320,
+		},
+	}
+	p, err := charts.LineRender(
+		values,
+		charts.TitleTextOptionFunc("Line"),
+		charts.FontFamilyOptionFunc("noto"),
+		charts.XAxisDataOptionFunc([]string{
+			"星期一",
+			"星期二",
+			"星期三",
+			"星期四",
+			"星期五",
+			"星期六",
+			"星期日",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"邮件",
+			"广告",
+			"视频广告",
+			"直接访问",
+			"搜索引擎",
+		}, charts.PositionCenter),
+	)
+
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err = p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}