Test cases for creator and test files.

pdf/creator/creator_test.go

@@ -0,0 +1,804 @@
+/*
+ * This file is subject to the terms and conditions defined in
+ * file 'LICENSE.md', which is part of this source code package.
+ */
+
+package creator
+
+// This test file contains multiple tests to generate PDFs. The outputs are written into /tmp as files.  The files
+// themselves need to be observed to check for correctness as we don't have a good way to automatically check
+// if every detail is correct.
+
+import (
+	"fmt"
+	goimage "image"
+	"io/ioutil"
+	"math"
+	"testing"
+
+	"github.com/boombuler/barcode"
+	"github.com/boombuler/barcode/qr"
+	"github.com/unidoc/unidoc/pdf/model"
+	"github.com/unidoc/unidoc/pdf/model/fonts"
+)
+
+const testPdfFile1 = "../../testfiles/minimal.pdf"
+const testPdfLoremIpsumFile = "../../testfiles/lorem.pdf"
+const testPdfTemplatesFile1 = "../../testfiles/templates1.pdf"
+const testImageFile1 = "../../testfiles/logo.png"
+const testImageFile2 = "../../testfiles/signature.png"
+
+func init() {
+	//common.SetLogger(common.NewConsoleLogger(common.LogLevelTrace))
+}
+
+func TestTemplate1(t *testing.T) {
+	creator := New()
+
+	pages, err := loadPagesFromFile(testPdfFile1)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	template, err := NewBlockFromPage(pages[0])
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	template.SetPos(0, 0)
+	creator.Draw(template)
+
+	template.SetAngle(45)
+	creator.Draw(template)
+
+	template.Scale(0.5, 0.5)
+	creator.Draw(template)
+
+	template.Scale(4, 4)
+	creator.Draw(template)
+
+	template.SetAngle(90)
+	template.SetPos(100, 200)
+	creator.Draw(template)
+
+	creator.WriteToFile("/tmp/template_1.pdf")
+
+	return
+}
+
+func TestImage1(t *testing.T) {
+	creator := New()
+
+	imgData, err := ioutil.ReadFile(testImageFile1)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	img, err := NewImage(imgData)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	img.SetPos(0, 100)
+	img.ScaleToWidth(1.0 * creator.Width())
+
+	err = creator.Draw(img)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	err = creator.WriteToFile("/tmp/1.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestImageWrapping(t *testing.T) {
+	creator := New()
+
+	imgData, err := ioutil.ReadFile(testImageFile1)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	img, err := NewImage(imgData)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	for j := 0; j < 40; j++ {
+		img.ScaleToWidth(100 + 10*float64(j+1))
+
+		err = creator.Draw(img)
+		if err != nil {
+			t.Errorf("Fail: %v\n", err)
+			return
+		}
+	}
+
+	err = creator.WriteToFile("/tmp/1_wrap.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestImageRotation(t *testing.T) {
+	creator := New()
+
+	imgData, err := ioutil.ReadFile(testImageFile1)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	img, err := NewImage(imgData)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	//creator.MoveTo(0, 0)
+	img.ScaleToWidth(100)
+
+	angles := []float64{0, 90, 180, 270}
+	for _, angle := range angles {
+		creator.NewPage()
+
+		creator.MoveTo(100, 100)
+
+		img.SetAngle(angle)
+		err = creator.Draw(img)
+		if err != nil {
+			t.Errorf("Fail: %v\n", err)
+			return
+		}
+	}
+
+	err = creator.WriteToFile("/tmp/1_rotate.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestImageRotationAndWrap(t *testing.T) {
+	creator := New()
+
+	imgData, err := ioutil.ReadFile(testImageFile1)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	img, err := NewImage(imgData)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+	img.ScaleToWidth(100)
+
+	creator.NewPage()
+
+	creator.MoveTo(100, 100)
+
+	angles := []float64{0, 90, 180, 270, 0, 90, 180, 270}
+	//angles := []float64{0, 0, 45, 90}
+
+	for _, angle := range angles {
+		img.SetAngle(angle)
+
+		err = creator.Draw(img)
+		if err != nil {
+			t.Errorf("Fail: %v\n", err)
+			return
+		}
+	}
+
+	err = creator.WriteToFile("/tmp/rotate_2.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestParagraph1(t *testing.T) {
+	creator := New()
+
+	p := NewParagraph("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt" +
+		"ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut " +
+		"aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore" +
+		"eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt " +
+		"mollit anim id est laborum.")
+
+	err := creator.Draw(p)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	err = creator.WriteToFile("/tmp/2_p1.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestParagraphWrapping(t *testing.T) {
+	creator := New()
+
+	p := NewParagraph("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt" +
+		"ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut " +
+		"aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore" +
+		"eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt " +
+		"mollit anim id est laborum.")
+
+	p.SetMargins(0, 0, 5, 0)
+
+	alignments := []TextAlignment{TextAlignmentLeft, TextAlignmentJustify, TextAlignmentCenter, TextAlignmentRight}
+	for j := 0; j < 25; j++ {
+		//p.SetAlignment(alignments[j%4])
+		p.SetTextAlignment(alignments[1])
+
+		err := creator.Draw(p)
+		if err != nil {
+			t.Errorf("Fail: %v\n", err)
+			return
+		}
+	}
+
+	err := creator.WriteToFile("/tmp/2_pwrap.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestParagraphFonts(t *testing.T) {
+	creator := New()
+
+	verdana, err := model.NewPdfFontFromTTFFile("/Library/Fonts/Verdana.ttf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	arialBold, err := model.NewPdfFontFromTTFFile("/Library/Fonts/Arial Bold.ttf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	fonts := []fonts.Font{verdana, arialBold, fonts.NewFontHelvetica(), verdana, arialBold, fonts.NewFontHelvetica()}
+	for _, font := range fonts {
+		p := NewParagraph("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt" +
+			"ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut " +
+			"aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore" +
+			"eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt " +
+			"mollit anim id est laborum.")
+		p.SetFont(font)
+		p.SetFontSize(14)
+		//p.SetWrapWidth(0.8 * creator.Width())
+		p.SetTextAlignment(TextAlignmentJustify)
+		p.SetLineHeight(1.2)
+		p.SetMargins(0, 0, 5, 0)
+
+		err = creator.Draw(p)
+		if err != nil {
+			t.Errorf("Fail: %v\n", err)
+			return
+		}
+	}
+
+	err = creator.WriteToFile("/tmp/2_pArial.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestChapter(t *testing.T) {
+	c := New()
+
+	ch1 := c.NewChapter("Introduction")
+
+	//subCh1 := NewSubchapter(ch1, "Workflow")
+
+	p := NewParagraph("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt " +
+		"ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut " +
+		"aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore " +
+		"eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt " +
+		"mollit anim id est laborum.")
+	p.SetMargins(0, 0, 10, 0)
+
+	for j := 0; j < 55; j++ {
+		ch1.Add(p) // Can add any drawable..
+	}
+
+	c.Draw(ch1)
+
+	err := c.WriteToFile("/tmp/3_chapters.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestSubchaptersSimple(t *testing.T) {
+	c := New()
+
+	ch1 := c.NewChapter("Introduction")
+	subchap1 := c.NewSubchapter(ch1, "The fundamentals of the mastery of the most genious experiment of all times in modern world history. The story of the maker and the maker bot and the genius cow.")
+	subchap1.SetMargins(0, 0, 5, 0)
+
+	//subCh1 := NewSubchapter(ch1, "Workflow")
+
+	p := NewParagraph("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt " +
+		"ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut " +
+		"aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore " +
+		"eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt " +
+		"mollit anim id est laborum.")
+	p.SetTextAlignment(TextAlignmentJustify)
+	p.SetMargins(0, 0, 5, 0)
+	for j := 0; j < 1; j++ {
+		subchap1.Add(p)
+	}
+
+	subchap2 := c.NewSubchapter(ch1, "Mechanism")
+	subchap2.SetMargins(0, 0, 5, 0)
+	for j := 0; j < 1; j++ {
+		subchap2.Add(p)
+	}
+
+	subchap3 := c.NewSubchapter(ch1, "Discussion")
+	subchap3.SetMargins(0, 0, 5, 0)
+	for j := 0; j < 1; j++ {
+		subchap3.Add(p)
+	}
+
+	subchap4 := c.NewSubchapter(ch1, "Conclusion")
+	subchap4.SetMargins(0, 0, 5, 0)
+	for j := 0; j < 1; j++ {
+		subchap4.Add(p)
+	}
+	c.Draw(ch1)
+
+	ch2 := c.NewChapter("References")
+	for j := 0; j < 13; j++ {
+		ch2.Add(p)
+	}
+	c.Draw(ch2)
+
+	// Set a function to create the front Page.
+	c.CreateFrontPage(func(pageNum int, numPages int) {
+		p := NewParagraph("Example Report")
+		p.SetWidth(c.Width())
+		p.SetTextAlignment(TextAlignmentCenter)
+		p.SetFontSize(32)
+		p.SetPos(0, 300)
+		c.Draw(p)
+
+		p.SetFontSize(22)
+		p.SetText("Example Report Data Results")
+		p.SetPos(0, 340)
+		c.Draw(p)
+	})
+
+	// Set a function to create the table of contents.
+	// Should be able to wrap..
+	c.CreateTableOfContents(func(toc *TableOfContents) (*Chapter, error) {
+		ch := c.NewChapter("Table of contents")
+		ch.GetHeading().SetColor(0.5, 0.5, 0.5)
+		ch.GetHeading().SetFontSize(28)
+		ch.GetHeading().SetMargins(0, 0, 0, 30)
+
+		numRows := len(toc.entries)
+		table := NewTable(numRows, 2) // Nx3 table
+		// Default, equal column sizes (4x0.25)...
+		table.SetColumnWidths(0.9, 0.1)
+
+		row := 1
+		for _, entry := range toc.entries {
+			// Col 1. Chapter number, title.
+			var str string
+			if entry.Subchapter == 0 {
+				str = fmt.Sprintf("%d. %s", entry.Chapter, entry.Title)
+			} else {
+				str = fmt.Sprintf("        %d.%d. %s", entry.Chapter, entry.Subchapter, entry.Title)
+			}
+			p := NewParagraph(str)
+			p.SetFontSize(14)
+			cell := table.NewCell(row, 1)
+			cell.SetContent(p)
+			// Set the width so the height can be determined correctly.
+			p.SetWidth(c.Width() - c.pageMargins.left - c.pageMargins.right)
+			table.SetRowHeight(row, p.Height()+5)
+
+			// Col 1. Page number.
+			p = NewParagraph(fmt.Sprintf("%d", entry.PageNumber))
+			p.SetFontSize(14)
+			cell = table.NewCell(row, 2)
+			cell.SetContent(p)
+
+			row++
+		}
+		err := ch.Add(table)
+		if err != nil {
+			fmt.Printf("Error adding table: %v\n", err)
+			return nil, err
+		}
+
+		return ch, nil
+	})
+
+	err := c.WriteToFile("/tmp/3_subchapters_simple.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestSubchapters(t *testing.T) {
+	c := New()
+
+	ch1 := c.NewChapter("Introduction")
+	subchap1 := c.NewSubchapter(ch1, "The fundamentals")
+	subchap1.SetMargins(0, 0, 5, 0)
+
+	//subCh1 := NewSubchapter(ch1, "Workflow")
+
+	p := NewParagraph("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt " +
+		"ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut " +
+		"aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore " +
+		"eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt " +
+		"mollit anim id est laborum.")
+	p.SetTextAlignment(TextAlignmentJustify)
+	p.SetMargins(0, 0, 5, 0)
+	for j := 0; j < 18; j++ {
+		subchap1.Add(p)
+	}
+
+	subchap2 := c.NewSubchapter(ch1, "Mechanism")
+	subchap2.SetMargins(0, 0, 5, 0)
+	for j := 0; j < 15; j++ {
+		subchap2.Add(p)
+	}
+
+	subchap3 := c.NewSubchapter(ch1, "Discussion")
+	subchap3.SetMargins(0, 0, 5, 0)
+	for j := 0; j < 19; j++ {
+		subchap3.Add(p)
+	}
+
+	subchap4 := c.NewSubchapter(ch1, "Conclusion")
+	subchap4.SetMargins(0, 0, 5, 0)
+	for j := 0; j < 23; j++ {
+		subchap4.Add(p)
+	}
+
+	c.Draw(ch1)
+
+	for i := 0; i < 50; i++ {
+		ch2 := c.NewChapter("References")
+		for j := 0; j < 13; j++ {
+			ch2.Add(p)
+		}
+
+		c.Draw(ch2)
+	}
+
+	// Set a function to create the front Page.
+	c.CreateFrontPage(func(pageNum int, numPages int) {
+		p := NewParagraph("Example Report")
+		p.SetWidth(c.Width())
+		p.SetTextAlignment(TextAlignmentCenter)
+		p.SetFontSize(32)
+		p.SetPos(0, 300)
+		c.Draw(p)
+
+		p.SetFontSize(22)
+		p.SetText("Example Report Data Results")
+		p.SetPos(0, 340)
+		c.Draw(p)
+	})
+
+	// Set a function to create the table of contents.
+	c.CreateTableOfContents(func(toc *TableOfContents) (*Chapter, error) {
+		ch := c.NewChapter("Table of contents")
+		ch.GetHeading().SetColor(0.5, 0.5, 0.5)
+		ch.GetHeading().SetFontSize(28)
+		ch.GetHeading().SetMargins(0, 0, 0, 30)
+
+		numRows := len(toc.entries)
+		table := NewTable(numRows, 2) // Nx3 table
+		// Default, equal column sizes (4x0.25)...
+		table.SetColumnWidths(0.9, 0.1)
+
+		row := 1
+		for _, entry := range toc.entries {
+			// Col 1. Chapter number, title.
+			var str string
+			if entry.Subchapter == 0 {
+				str = fmt.Sprintf("%d. %s", entry.Chapter, entry.Title)
+			} else {
+				str = fmt.Sprintf("        %d.%d. %s", entry.Chapter, entry.Subchapter, entry.Title)
+			}
+			p := NewParagraph(str)
+			p.SetFontSize(14)
+			cell := table.NewCell(row, 1)
+			cell.SetContent(p)
+			// Set the width so the height can be determined correctly.
+			p.SetWidth(c.Width() - c.pageMargins.left - c.pageMargins.right)
+			table.SetRowHeight(row, p.Height()+5)
+
+			// Col 1. Page number.
+			p = NewParagraph(fmt.Sprintf("%d", entry.PageNumber))
+			p.SetFontSize(14)
+			cell = table.NewCell(row, 2)
+			cell.SetContent(p)
+
+			row++
+		}
+		err := ch.Add(table)
+		if err != nil {
+			fmt.Printf("Error adding table: %v\n", err)
+			return nil, err
+		}
+
+		return ch, nil
+	})
+
+	addHeadersAndFooters(c)
+
+	err := c.WriteToFile("/tmp/3_subchapters.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func TestTable(t *testing.T) {
+	table := NewTable(4, 4) // 4x4 table
+	// Default, equal column sizes (4x0.25)...
+	table.SetColumnWidths(0.5, 0.2, 0.2, 0.1)
+
+	cell := table.NewCell(1, 1)
+	p := NewParagraph("1,1")
+	cell.SetContent(p)
+
+	cell = table.NewCell(1, 2)
+	p = NewParagraph("1,2")
+	cell.SetContent(p)
+
+	cell = table.NewCell(1, 3)
+	p = NewParagraph("1,3")
+	cell.SetContent(p)
+
+	cell = table.NewCell(1, 4)
+	p = NewParagraph("1,4")
+	cell.SetContent(p)
+
+	cell = table.NewCell(2, 1)
+	p = NewParagraph("2,1")
+	cell.SetContent(p)
+
+	cell = table.NewCell(2, 2)
+	p = NewParagraph("2,2")
+	cell.SetContent(p)
+
+	cell = table.NewCell(2, 4)
+	p = NewParagraph("2,4")
+	cell.SetContent(p)
+
+	cell = table.NewCell(4, 4)
+	p = NewParagraph("4,4")
+	cell.SetContent(p)
+
+	c := New()
+	c.Draw(table)
+
+	err := c.WriteToFile("/tmp/4_table.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func addHeadersAndFooters(c *Creator) {
+	c.DrawHeader(func(pageNum int, totPages int) {
+		/*
+			if pageNum == 1 {
+				// Skip on front Page.
+				return
+			}
+		*/
+
+		// Add Page number
+		p := NewParagraph(fmt.Sprintf("Page %d / %d", pageNum, totPages))
+		p.SetPos(0.8*c.pageWidth, 20)
+		c.Draw(p)
+
+		// Draw on the template...
+		img, err := NewImageFromFile(testImageFile1)
+		if err != nil {
+			fmt.Printf("ERROR : %v\n", err)
+		}
+		img.ScaleToHeight(0.4 * c.pageMargins.top)
+		img.SetPos(20, 10)
+
+		c.Draw(img)
+	})
+
+	c.DrawFooter(func(pageNum int, totPages int) {
+		/*
+			if pageNum == 1 {
+				// Skip on front Page.
+				return
+			}
+		*/
+
+		// Add company name.
+		companyName := "Company inc."
+		p := NewParagraph(companyName)
+		p.SetPos(0.1*c.pageWidth, c.pageHeight-c.pageMargins.bottom+10)
+		c.Draw(p)
+
+		p = NewParagraph("July 2017")
+		p.SetPos(0.8*c.pageWidth, c.pageHeight-c.pageMargins.bottom+10)
+		c.Draw(p)
+	})
+}
+
+func TestHeadersAndFooters(t *testing.T) {
+	c := New()
+
+	ch1 := c.NewChapter("Introduction")
+
+	p := NewParagraph("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt " +
+		"ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut " +
+		"aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore " +
+		"eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt " +
+		"mollit anim id est laborum.")
+	p.SetMargins(0, 0, 10, 0)
+
+	for j := 0; j < 55; j++ {
+		ch1.Add(p) // Can add any drawable..
+	}
+
+	c.Draw(ch1)
+
+	// Make unidoc headers and footers.
+	addHeadersAndFooters(c)
+
+	err := c.WriteToFile("/tmp/4_headers.pdf")
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+}
+
+func makeQrCodeImage(text string, width float64, oversampling int) (goimage.Image, error) {
+	qrCode, err := qr.Encode(text, qr.M, qr.Auto)
+	if err != nil {
+		return nil, err
+	}
+
+	pixelWidth := 5 * int(math.Ceil(width))
+	qrCode, err = barcode.Scale(qrCode, pixelWidth, pixelWidth)
+	if err != nil {
+		return nil, err
+	}
+
+	return qrCode, nil
+}
+
+func TestQRCodeOnNewPage(t *testing.T) {
+	creator := New()
+
+	qrCode, err := makeQrCodeImage("HELLO", 40, 5)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	img, err := NewImageFromGoImage(qrCode)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+	// Sets positioning to absolute coordinates.
+	img.SetWidth(40)
+	img.SetHeight(40)
+
+	for i := 0; i < 5; i++ {
+		img.SetPos(100.0*float64(i), 100.0*float64(i))
+		creator.Draw(img)
+	}
+
+	creator.WriteToFile("/tmp/3_barcode_qr_newpage.pdf")
+}
+
+// Example of using a template Page, generating and applying QR
+func TestQRCodeOnTemplate(t *testing.T) {
+	pages, err := loadPagesFromFile(testPdfTemplatesFile1)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+	if len(pages) < 2 {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	// Load Page 1 as template.
+	tpl, err := NewBlockFromPage(pages[1])
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+	tpl.SetPos(0, 0)
+
+	// Generate QR code.
+	qrCode, err := makeQrCodeImage("HELLO", 50, 5)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+
+	// Prepare content image.
+	image, err := NewImageFromGoImage(qrCode)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+	image.SetWidth(50)
+	image.SetHeight(50)
+	image.SetPos(480, 100)
+
+	tpl.Draw(image)
+
+	creator := New()
+	creator.NewPage()
+	creator.Draw(tpl)
+
+	// Add another Page where the template has been rotated.
+	creator.NewPage()
+	tpl.SetAngle(90)
+	tpl.SetPos(-50, 750)
+
+	creator.Draw(tpl)
+
+	// Add another Page where the template is rotated 90 degrees.
+	loremPages, err := loadPagesFromFile(testPdfLoremIpsumFile)
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+	if len(loremPages) != 1 {
+		t.Errorf("Pages != 1")
+		return
+	}
+
+	// Add another Page where another Page is embedded on the Page.  The other Page is scaled and shifted to fit
+	// on the right of the template.
+	loremTpl, err := NewBlockFromPage(loremPages[0])
+	if err != nil {
+		t.Errorf("Fail: %v\n", err)
+		return
+	}
+	loremTpl.ScaleToWidth(0.8 * creator.Width())
+	loremTpl.SetPos(100, 100)
+
+	creator.Draw(loremTpl)
+
+	// Write the example to file.
+	creator.WriteToFile("/tmp/4_barcode_on_tpl.pdf")
+}