gofpdfを使う

package main

import (
	"fmt"
	"github.com/jung-kurt/gofpdf"
)

func main() {
	pdf := gofpdf.New("P", "mm", "A4", "")
	pdf.AddPage()
	pdf.SetFont("Arial", "B", 16)
	pdf.Cell(40, 10, "Hello, world")
	err := pdf.OutputFileAndClose("hello.pdf")
	if err != nil {
		fmt.Printf("error\n")
	}
}

	pdf := gofpdf.New("P", "mm", "A4", "")

	pdf.AddPage()

	pdf.SetFont("Arial", "B", 16)

	pdf.Cell(40, 10, "Hello, world")

	err := pdf.OutputFileAndClose("hello.pdf")

// Fpdf is the principal structure for creating a single PDF document
type Fpdf struct {
	page             int                       // current page number
	n                int                       // current object number
	offsets          []int                     // array of object offsets
	templates        map[int64]Template        // templates used in this document
	templateObjects  map[int64]int             // template object IDs within this document
	buffer           fmtBuffer                 // buffer holding in-memory PDF
	pages            []*bytes.Buffer           // slice[page] of page content; 1-based
	state            int                       // current document state
	compress         bool                      // compression flag
	k                float64                   // scale factor (number of points in user unit)
	defOrientation   string                    // default orientation
	curOrientation   string                    // current orientation
	stdPageSizes     map[string]SizeType       // standard page sizes
	defPageSize      SizeType                  // default page size
	curPageSize      SizeType                  // current page size
	pageSizes        map[int]SizeType          // used for pages with non default sizes or orientations
	unitStr          string                    // unit of measure for all rendered objects except fonts
	wPt, hPt         float64                   // dimensions of current page in points
	w, h             float64                   // dimensions of current page in user unit
	lMargin          float64                   // left margin
	tMargin          float64                   // top margin
	rMargin          float64                   // right margin
	bMargin          float64                   // page break margin
	cMargin          float64                   // cell margin
	x, y             float64                   // current position in user unit
	lasth            float64                   // height of last printed cell
	lineWidth        float64                   // line width in user unit
	fontpath         string                    // path containing fonts
	fontLoader       FontLoader                // used to load font files from arbitrary locations
	coreFonts        map[string]bool           // array of core font names
	fonts            map[string]fontDefType    // array of used fonts
	fontFiles        map[string]fontFileType   // array of font files
	diffs            []string                  // array of encoding differences
	fontFamily       string                    // current font family
	fontStyle        string                    // current font style
	underline        bool                      // underlining flag
	currentFont      fontDefType               // current font info
	fontSizePt       float64                   // current font size in points
	fontSize         float64                   // current font size in user unit
	ws               float64                   // word spacing
	images           map[string]*ImageInfoType // array of used images
	pageLinks        [][]linkType              // pageLinks[page][link], both 1-based
	links            []intLinkType             // array of internal links
	outlines         []outlineType             // array of outlines
	outlineRoot      int                       // root of outlines
	autoPageBreak    bool                      // automatic page breaking
	acceptPageBreak  func() bool               // returns true to accept page break
	pageBreakTrigger float64                   // threshold used to trigger page breaks
	inHeader         bool                      // flag set when processing header
	headerFnc        func()                    // function provided by app and called to write header
	inFooter         bool                      // flag set when processing footer
	footerFnc        func()                    // function provided by app and called to write footer
	footerFncLpi     func(bool)                // function provided by app and called to write footer with last page flag
	zoomMode         string                    // zoom display mode
	layoutMode       string                    // layout display mode
	xmp              []byte                    // XMP metadata
	title            string                    // title
	subject          string                    // subject
	author           string                    // author
	keywords         string                    // keywords
	creator          string                    // creator
	creationDate     time.Time                 // override for dcoument CreationDate value
	aliasNbPagesStr  string                    // alias for total number of pages
	pdfVersion       string                    // PDF version number
	fontDirStr       string                    // location of font definition files
	capStyle         int                       // line cap style: butt 0, round 1, square 2
	joinStyle        int                       // line segment join style: miter 0, round 1, bevel 2
	dashArray        []float64                 // dash array
	dashPhase        float64                   // dash phase
	blendList        []blendModeType           // slice[idx] of alpha transparency modes, 1-based
	blendMap         map[string]int            // map into blendList
	blendMode        string                    // current blend mode
	alpha            float64                   // current transpacency
	gradientList     []gradientType            // slice[idx] of gradient records
	clipNest         int                       // Number of active clipping contexts
	transformNest    int                       // Number of active transformation contexts
	err              error                     // Set if error occurs during life cycle of instance
	protect          protectType               // document protection structure
	layer            layerRecType              // manages optional layers in document
	catalogSort      bool                      // sort resource catalogs in document
	nJs              int                       // JavaScript object number
	javascript       *string                   // JavaScript code to include in the PDF
	colorFlag        bool                      // indicates whether fill and text colors are different
	color            struct {
		// Composite values of colors
		draw, fill, text colorType
	}
	spotColorMap map[string]spotColorType // Map of named ink-based colors
}