dvas0004/pdfExperiment.go

## pdfExperiment.go
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()
}
	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()
	}