Add example that demonstrates how to embed an image that is retrieved from a web server. Resolves issue 29.

1 files changed, 43 insertions, 1 deletions

diff --git a/fpdf_test.go b/fpdf_test.go
index 41f388e..11b96bb 100644
--- a/fpdf_test.go
+++ b/fpdf_test.go
@@ -22,6 +22,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"math"
+	"net/http"
 	"os"
 	"path/filepath"
 	"strings"
@@ -1281,7 +1282,48 @@ func ExampleFpdf_tutorial26() {
 	pdf.EndLayer()
 
 	pdf.OutputAndClose(docWriter(pdf, 26))
-
 	// Output:
 	// Successfully generated pdf/tutorial26.pdf
+
+}
+
+// This example demonstrates the use of an image that is retrieved from a web
+// server.
+func ExampleFpdf_tutorial27() {
+
+	const (
+		margin   = 10
+		wd       = 210
+		ht       = 297
+		fontSize = 15
+		urlStr   = "https://code.google.com/p/gofpdf/logo?cct=1402750750"
+		msgStr   = `Images from the web can be easily embedded when a PDF document is generated.`
+	)
+
+	var (
+		rsp *http.Response
+		err error
+		tp  string
+	)
+
+	pdf := gofpdf.New("P", "mm", "A4", "")
+	pdf.AddPage()
+	pdf.SetFont("Helvetica", "", fontSize)
+	ln := pdf.PointConvert(fontSize)
+	pdf.MultiCell(wd-margin-margin, ln, msgStr, "", "L", false)
+	rsp, err = http.Get(urlStr)
+	if err == nil {
+		tp = pdf.ImageTypeFromMime(rsp.Header["Content-Type"][0])
+		infoPtr := pdf.RegisterImageReader(urlStr, tp, rsp.Body)
+		if pdf.Ok() {
+			imgWd, imgHt := infoPtr.Extent()
+			pdf.Image(urlStr, (wd-imgWd)/2.0, pdf.GetY()+ln, imgWd, imgHt, false, tp, 0, "")
+		}
+	} else {
+		pdf.SetError(err)
+	}
+	pdf.OutputAndClose(docWriter(pdf, 27))
+	// Output:
+	// Successfully generated pdf/tutorial27.pdf
+
 }