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| package main | |
| import ( | |
| "bytes" | |
| "fmt" | |
| "log" | |
| "math/rand" | |
| "os" | |
| "strings" | |
| "time" | |
| "github.com/SebastiaanKlippert/go-wkhtmltopdf" | |
| "github.com/go-echarts/go-echarts/v2/charts" | |
| "github.com/go-echarts/go-echarts/v2/opts" | |
| ) | |
| // generate random data for bar chart | |
| func generateBarItems() []opts.BarData { | |
| items := make([]opts.BarData, 0) | |
| for i := 0; i < 7; i++ { | |
| items = append(items, opts.BarData{Value: rand.Intn(300)}) | |
| } | |
| return items | |
| } | |
| func exampleBarChart() bytes.Buffer { | |
| // create a new bar instance | |
| bar := charts.NewBar() | |
| // set some global options like Title/Legend/ToolTip or anything else | |
| bar.SetGlobalOptions(charts.WithTitleOpts(opts.Title{ | |
| Title: "My first bar chart generated by go-echarts", | |
| Subtitle: "It's extremely easy to use, right?", | |
| })) | |
| // Put data into instance | |
| bar.SetXAxis([]string{"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"}). | |
| AddSeries("Category A", generateBarItems()). | |
| AddSeries("Category B", generateBarItems()) | |
| // Where the magic happens | |
| var result bytes.Buffer | |
| bar.Render(&result) | |
| return result | |
| } | |
| func ExampleNewPDFGenerator() { | |
| // Create new PDF generator | |
| pdfg, err := wkhtmltopdf.NewPDFGenerator() | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| html := "<html>Hi</html>" | |
| pdfg.AddPage(wkhtmltopdf.NewPageReader(strings.NewReader(html))) | |
| chart := exampleBarChart() | |
| chartString := strings.ReplaceAll(chart.String(), "let ", "var ") | |
| f, _ := os.Create(fmt.Sprintf("bar-%d.html", time.Now().UnixMicro())) | |
| f.WriteString(chartString) | |
| f.Close() | |
| defer os.Remove(f.Name()) | |
| pdfg.AddPage(wkhtmltopdf.NewPage(f.Name())) | |
| // Create PDF document in internal buffer | |
| err = pdfg.Create() | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| // Write buffer contents to file on disk | |
| err = pdfg.WriteFile("./simplesample.pdf") | |
| if err != nil { | |
| log.Fatal(err) | |
| } | |
| fmt.Println("Done") | |
| // Output: Done | |
| } | |
| func main() { | |
| ExampleNewPDFGenerator() | |
| } |
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