Lawrence Kesteloot provided code to allow an image's extent to be determined prior to placement.

1 files changed, 50 insertions, 0 deletions

diff --git a/fpdf_test.go b/fpdf_test.go
index ccdf1bf..b683b9c 100644
--- a/fpdf_test.go
+++ b/fpdf_test.go
@@ -22,6 +22,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"regexp"
 	"strings"
 )
@@ -1083,3 +1084,52 @@ func ExampleFpdf_tutorial17() {
 	// Output:
 	// Successfully generated pdf/tutorial17.pdf
 }
+
+// Example to demonstrate Lawrence Kesteloot's image registration code.
+func ExampleFpdf_tutorial18() {
+	const (
+		margin = 10
+		wd     = 210
+		ht     = 297
+	)
+	fileList := []string{
+		"logo-gray.png",
+		"logo.jpg",
+		"logo.png",
+		"logo-rgb.png",
+		"logo-progressive.jpg",
+	}
+	var infoPtr *gofpdf.ImageInfoType
+	var fileStr string
+	var imgWd, imgHt, lf, tp float64
+	pdf := gofpdf.New("P", "mm", "A4", FONT_DIR)
+	pdf.AddPage()
+	pdf.SetMargins(10, 10, 10)
+	pdf.SetFont("Helvetica", "", 15)
+	for j, str := range fileList {
+		fileStr = filepath.Join(IMG_DIR, str)
+		infoPtr = pdf.RegisterImage(fileStr, "")
+		imgWd, imgHt = infoPtr.Extent()
+		switch j {
+		case 0:
+			lf = margin
+			tp = margin
+		case 1:
+			lf = wd - margin - imgWd
+			tp = margin
+		case 2:
+			lf = (wd - imgWd) / 2.0
+			tp = (ht - imgHt) / 2.0
+		case 3:
+			lf = margin
+			tp = ht - imgHt - margin
+		case 4:
+			lf = wd - imgWd - margin
+			tp = ht - imgHt - margin
+		}
+		pdf.Image(fileStr, lf, tp, imgWd, imgHt, false, "", 0, "")
+	}
+	pdf.OutputAndClose(docWriter(pdf, 18))
+	// Output:
+	// Successfully generated pdf/tutorial18.pdf
+}