How to use the time function in Go language to generate a schedule calendar and export it to a PDF file?

How to use the time function in Go language to generate a schedule calendar and export it to a PDF file?

In daily life and work, we often need to arrange and manage schedules, and an important task is to generate a schedule calendar. As a concise and efficient programming language, Go language provides a wealth of time functions that can easily operate date and time. This article will introduce how to use the time function in the Go language to generate a schedule calendar and export it to a PDF file.

First, we need to create a schedule calendar data structure. Assume that our schedule calendar contains two fields: date and event, which can be represented by a structure:

type Event struct {
    Date  time.Time
    Title string
}

Next, we need to generate a series of events and store them in a slice. In this example, we randomly generate some events and set their dates to the current date plus a random number of days:

func generateEvents(num int) []Event {
    events := make([]Event, num)
    now := time.Now()
    rand.Seed(time.Now().UnixNano())
    for i := 0; i < num; i++ {
        event := Event{
            Date:  now.AddDate(0, 0, rand.Intn(30)),
            Title: fmt.Sprintf("Event %d", i+1),
        }
        events[i] = event
    }
    return events
}

Next, we need to sort the events by date. This can be achieved using the Sort function in the sort package of the Go language:

type ByDate []Event

func (b ByDate) Len() int           { return len(b) }
func (b ByDate) Less(i, j int) bool { return b[i].Date.Before(b[j].Date) }
func (b ByDate) Swap(i, j int)      { b[i], b[j] = b[j], b[i] }

func sortEvents(events []Event) {
    sort.Sort(ByDate(events))
}

With the sorted event slices, we can display them in a calendar grid. We can use the third-party package github.com/jung-kurt/gofpdf to operate PDF files and draw calendar grids.

const (
    pdfWidth  = 210
    pdfHeight = 297
    cellWidth = pdfWidth / 7
    cellHeight = 15
)

func drawCalendar(events []Event) {
    pdf := gofpdf.New("P", "mm", "A4", "")
    pdf.AddPage()
    pdf.SetFont("Arial", "", 12)

    // Draw header
    pdf.CellFormat(pdfWidth, cellHeight, "Calendar", "0", 1, "CM")

    // Draw days of the week
    weekdays := []string{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}
    for _, day := range weekdays {
        pdf.CellFormat(cellWidth, cellHeight, day, "1", 0, "CM", false, 0, "")
    }
    pdf.Ln(-1)

    // Draw events
    for _, event := range events {
        day := event.Date.Weekday()
        x := float64(day) * cellWidth
        y := pdf.GetY()

        pdf.SetX(x)
        pdf.SetY(y)
        pdf.CellFormat(cellWidth, cellHeight, event.Title, "1", 0, "CM", false, 0, "")

        pdf.Ln(-1)
    }

    pdf.OutputFileAndClose("calendar.pdf")
}

Finally, we combine the above functions, call and generate the schedule calendar in the main function:

func main() {
    events := generateEvents(10)
    sortEvents(events)
    drawCalendar(events)
}

The above is to use the time function in the Go language to generate the schedule calendar and export it to a PDF file Complete example. Please make sure your machine has the required third-party packages installed and use go mod to manage package dependencies. Through this example, you can use the powerful time function in the Go language to easily generate a customized schedule and export it as a PDF file for better schedule management and arrangement.

The complete code for this article can be found at the following link: [Github link](https://github.com/your-repo/calender-generator). Have fun using Go language to generate schedules and calendars!

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