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gopdf is a simple library for generating PDF document written in Go lang.
A minimum version of Go 1.13 is required.
go get -u github.com/signintech/gopdf
package main
import (
"log"
"github.com/signintech/gopdf"
)
func main() {
pdf := gopdf.GoPdf{}
pdf.Start(gopdf.Config{ PageSize: *gopdf.PageSizeA4 })
pdf.AddPage()
err := pdf.AddTTFFont("wts11", "../ttf/wts11.ttf")
if err != nil {
log.Print(err.Error())
return
}
err = pdf.SetFont("wts11", "", 14)
if err != nil {
log.Print(err.Error())
return
}
pdf.Cell(nil, "您好")
pdf.WritePdf("hello.pdf")
}
pdf.SetTextColor(156, 197, 140)
pdf.Cell(nil, "您好")
pdf.SetTextColorCMYK(0, 6, 14, 0)
pdf.Cell(nil, "Hello")
package main
import (
"log"
"github.com/signintech/gopdf"
)
func main() {
pdf := gopdf.GoPdf{}
pdf.Start(gopdf.Config{PageSize: *gopdf.PageSizeA4 })
pdf.AddPage()
var err error
err = pdf.AddTTFFont("loma", "../ttf/Loma.ttf")
if err != nil {
log.Print(err.Error())
return
}
pdf.Image("../imgs/gopher.jpg", 200, 50, nil) //print image
err = pdf.SetFont("loma", "", 14)
if err != nil {
log.Print(err.Error())
return
}
pdf.SetXY(250, 200) //move current location
pdf.Cell(nil, "gopher and gopher") //print text
pdf.WritePdf("image.pdf")
}
package main
import (
"log"
"github.com/signintech/gopdf"
)
func main() {
pdf := gopdf.GoPdf{}
pdf.Start(gopdf.Config{ PageSize: *gopdf.PageSizeA4 })
pdf.AddPage()
err := pdf.AddTTFFont("times", "./test/res/times.ttf")
if err != nil {
log.Print(err.Error())
return
}
err = pdf.SetFont("times", "", 14)
if err != nil {
log.Print(err.Error())
return
}
pdf.SetXY(30, 40)
pdf.Text("Link to example.com")
pdf.AddExternalLink("http://example.com/", 27.5, 28, 125, 15)
pdf.SetXY(30, 70)
pdf.Text("Link to second page")
pdf.AddInternalLink("anchor", 27.5, 58, 120, 15)
pdf.AddPage()
pdf.SetXY(30, 100)
pdf.SetAnchor("anchor")
pdf.Text("Anchor position")
pdf.WritePdf("hello.tmp.pdf")
}
package main
import (
"log"
"github.com/signintech/gopdf"
)
func main() {
pdf := gopdf.GoPdf{}
pdf.Start(gopdf.Config{ PageSize: *gopdf.PageSizeA4 })
err := pdf.AddTTFFont("font1", "./test/res/font1.ttf")
if err != nil {
log.Print(err.Error())
return
}
err = pdf.SetFont("font1", "", 14)
if err != nil {
log.Print(err.Error())
return
}
pdf.AddHeader(func() {
pdf.SetY(5)
pdf.Cell(nil, "header")
})
pdf.AddFooter(func() {
pdf.SetY(825)
pdf.Cell(nil, "footer")
})
pdf.AddPage()
pdf.SetY(400)
pdf.Text("page 1 content")
pdf.AddPage()
pdf.SetY(400)
pdf.Text("page 2 content")
pdf.WritePdf("header-footer.tmp.pdf")
}
pdf.SetLineWidth(2)
pdf.SetLineType("dashed")
pdf.Line(10, 30, 585, 30)
pdf.SetLineWidth(1)
pdf.Oval(100, 200, 500, 500)
pdf.SetStrokeColor(255, 0, 0)
pdf.SetLineWidth(2)
pdf.SetFillColor(0, 255, 0)
pdf.Polygon([]gopdf.Point{{X: 10, Y: 30}, {X: 585, Y: 200}, {X: 585, Y: 250}}, "DF")
pdf.SetStrokeColor(255, 0, 0)
pdf.SetLineWidth(2)
pdf.SetFillColor(0, 255, 0)
err := pdf.Rectangle(196.6, 336.8, 398.3, 379.3, "DF", 3, 10)
if err != nil {
return err
}
pdf.SetStrokeColorCMYK(88, 49, 0, 0)
pdf.SetLineWidth(2)
pdf.SetFillColorCMYK(0, 5, 89, 0)
err := pdf.Rectangle(196.6, 336.8, 398.3, 379.3, "DF", 3, 10)
if err != nil {
return err
}
pdf.SetXY(100, 100)
pdf.Rotate(270.0, 100.0, 100.0)
pdf.Text("Hello...")
pdf.RotateReset() //reset
Read about transparency in pdf (page 320, section 11)
// alpha - value of transparency, can be between `0` and `1`
// blendMode - default value is `/Normal` - read about [blendMode and kinds of its](https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDF32000_2008.pdf) `(page 325, section 11.3.5)`
transparency := Transparency{
Alpha: 0.5,
BlendModeType: "",
}
pdf.SetTransparency(transparency Transparency)
package main
import (
"log"
"github.com/signintech/gopdf"
)
func main() {
pdf := gopdf.GoPdf{}
pdf.Start(gopdf.Config{
PageSize: *gopdf.PageSizeA4,
Protection: gopdf.PDFProtectionConfig{
UseProtection: true,
Permissions: gopdf.PermissionsPrint | gopdf.PermissionsCopy | gopdf.PermissionsModify,
OwnerPass: []byte("123456"),
UserPass: []byte("123456789")},
})
pdf.AddPage()
pdf.AddTTFFont("loma", "../ttf/loma.ttf")
pdf.Cell(nil,"Hi")
pdf.WritePdf("protect.pdf")
}
Import existing PDF power by package gofpdi created by @phpdave11 (thank you
package main
import (
"github.com/signintech/gopdf"
"io"
"net/http"
"os"
)
func main() {
var err error
// Download a Font
fontUrl := "https://github.com/google/fonts/raw/master/ofl/daysone/DaysOne-Regular.ttf"
if err = DownloadFile("example-font.ttf", fontUrl); err != nil {
panic(err)
}
// Download a PDF
fileUrl := "https://tcpdf.org/files/examples/example_012.pdf"
if err = DownloadFile("example-pdf.pdf", fileUrl); err != nil {
panic(err)
}
pdf := gopdf.GoPdf{}
pdf.Start(gopdf.Config{PageSize: *gopdf.PageSizeA4})
pdf.AddPage()
err = pdf.AddTTFFont("daysone", "example-font.ttf")
if err != nil {
panic(err)
}
err = pdf.SetFont("daysone", "", 20)
if err != nil {
panic(err)
}
// Color the page
pdf.SetLineWidth(0.1)
pdf.SetFillColor(124, 252, 0) //setup fill color
pdf.RectFromUpperLeftWithStyle(50, 100, 400, 600, "FD")
pdf.SetFillColor(0, 0, 0)
pdf.SetXY(50, 50)
pdf.Cell(nil, "Import existing PDF into GoPDF Document")
// Import page 1
tpl1 := pdf.ImportPage("example-pdf.pdf", 1, "/MediaBox")
// Draw pdf onto page
pdf.UseImportedTemplate(tpl1, 50, 100, 400, 0)
pdf.WritePdf("example.pdf")
}
// DownloadFile will download a url to a local file. It's efficient because it will
// write as it downloads and not load the whole file into memory.
func DownloadFile(filepath string, url string) error {
// Get the data
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
// Create the file
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
// Write the body to file
_, err = io.Copy(out, resp.Body)
return err
}
package main
import (
"log"
"github.com/signintech/gopdf"
)
func main() {
pdf := gopdf.GoPdf{}
mm6ToPx := 22.68
// Base trim-box
pdf.Start(gopdf.Config{
PageSize: *gopdf.PageSizeA4,
TrimBox: gopdf.Box{Left: mm6ToPx, Top: mm6ToPx, Right: gopdf.PageSizeA4.W - mm6ToPx, Bottom: gopdf.PageSizeA4.H - mm6ToPx},
})
// Page trim-box
opt := gopdf.PageOption{
PageSize: *gopdf.PageSizeA4,
TrimBox: &gopdf.Box{Left: mm6ToPx, Top: mm6ToPx, Right: gopdf.PageSizeA4.W - mm6ToPx, Bottom: gopdf.PageSizeA4.H - mm6ToPx},
}
pdf.AddPageWithOption(opt)
if err := pdf.AddTTFFont("wts11", "../ttf/wts11.ttf"); err != nil {
log.Print(err.Error())
return
}
if err := pdf.SetFont("wts11", "", 14); err != nil {
log.Print(err.Error())
return
}
pdf.Cell(nil,"Hi")
pdf.WritePdf("hello.pdf")
}
this function(s) made for experimental. There may be changes in the future.
With the placeholder function(s), you can create a placeholder to define a position. To make room for text to be add later.
There are 2 related function(s):
Use case: For example, when you want to print the "total number of pages" on every page in pdf file, but you don't know the "total number of pages" until you have created all the pages. You can use func PlaceHolderText to create the point where you want "total number of pages" to be printed. And then when you have created all the pages so you know the "total number of pages", you call FillInPlaceHoldText(...). This function will take the text (in this case, text is "total number of pages") replace at the point that been created since func PlaceHolderText.
func main(){
pdf := GoPdf{}
pdf.Start(Config{PageSize: *PageSizeA4})
pdf.AddTTFFont("font1", "font1.ttf")
pdf.SetFont("font1", "", 14) }
for i := 0; i < 5; i++ {
pdf.AddPage()
pdf.Br(20)
//create PlaceHolder
err = pdf.PlaceHolderText("totalnumber", 30)
if err != nil {
log.Print(err.Error())
return
}
}
//fillin text to PlaceHolder
err = pdf.FillInPlaceHoldText("totalnumber",fmt.Sprintf("%d", 5), Left)
if err != nil {
log.Print(err.Error())
return
}
pdf.WritePdf("placeholder_text.pdf")
}
package main
import (
"fmt"
"github.com/signintech/gopdf"
)
func main() {
// Create a new PDF document
pdf := &gopdf.GoPdf{}
// Start the PDF with a custom page size (we'll adjust it later)
pdf.Start(gopdf.Config{PageSize: gopdf.Rect{W: 430, H: 200}})
// Add a new page to the document
pdf.AddPage()
pdf.AddTTFFont("font1", "./font1.ttf")
pdf.SetFont("font1", "", 11)
pdf.AddTTFFont("font2", "./font2.ttf")
pdf.SetFont("font2", "", 11)
// Set the starting Y position for the table
tableStartY := 10.0
// Set the left margin for the table
marginLeft := 10.0
// Create a new table layout
table := pdf.NewTableLayout(marginLeft, tableStartY, 25, 5)
// Add columns to the table
table.AddColumn("CODE", 50, "left")
table.AddColumn("DESCRIPTION", 200, "left")
table.AddColumn("QTY.", 40, "right")
table.AddColumn("PRICE", 60, "right")
table.AddColumn("TOTAL", 60, "right")
// Add rows to the table
table.AddRow([]string{"001", "Product A", "2", "10.00", "20.00"})
table.AddRow([]string{"002", "Product B", "1", "15.00", "15.00"})
table.AddRow([]string{"003", "Product C", "3", "5.00", "15.00"})
// Set the style for table cells
table.SetTableStyle(gopdf.CellStyle{
BorderStyle: gopdf.BorderStyle{
Top: true,
Left: true,
Bottom: true,
Right: true,
Width: 1.0,
},
FillColor: gopdf.RGBColor{R: 255, G: 255, B: 255},
TextColor: gopdf.RGBColor{R: 0, G: 0, B: 0},
FontSize: 10,
})
// Set the style for table header
table.SetHeaderStyle(gopdf.CellStyle{
BorderStyle: gopdf.BorderStyle{
Top: true,
Left: true,
Bottom: true,
Right: true,
Width: 2.0,
RGBColor: gopdf.RGBColor{R: 100, G: 150, B: 255},
},
FillColor: gopdf.RGBColor{R: 255, G: 200, B: 200},
TextColor: gopdf.RGBColor{R: 255, G: 100, B: 100},
Font: "font2",
FontSize: 12,
})
table.SetCellStyle(gopdf.CellStyle{
BorderStyle: gopdf.BorderStyle{
Right: true,
Bottom: true,
Width: 0.5,
RGBColor: gopdf.RGBColor{R: 0, G: 0, B: 0},
},
FillColor: gopdf.RGBColor{R: 255, G: 255, B: 255},
TextColor: gopdf.RGBColor{R: 0, G: 0, B: 0},
Font: "font1",
FontSize: 10,
})
// Draw the table
table.DrawTable()
// Save the PDF to the specified path
pdf.WritePdf("table.pdf")
}
result:
visit https://github.com/oneplus1000/gopdfsample for more samples.
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