improves code

Author: 3ace

accessibility/pdf_tag_annots.go

@@ -54,7 +54,11 @@ func createPdfWithTextAnnotations(outputPath string) error {
 	// Create a new page with standard letter size.
 	page := model.NewPdfPage()
 	mediaBox := core.MakeArrayFromFloats([]float64{0, 0, 612, 792})
-	page.MediaBox, _ = model.NewPdfRectangle(*mediaBox)
+	mediaRect, err := model.NewPdfRectangle(*mediaBox)
+	if err != nil {
+		return fmt.Errorf("failed to create MediaBox rectangle: %w", err)
+	}
+	page.MediaBox = mediaRect
 
 	// Add first text annotation.
 	textAnnotation1 := model.NewPdfAnnotationText()

accessibility/pdf_tag_form.go

@@ -15,7 +15,6 @@
 package main
 
 import (
-	"fmt"
 	"log"
 	"os"
 
@@ -67,7 +66,7 @@ func main() {
 	form := model.NewPdfAcroForm()
 	fields := core.MakeArray()
 
-	// Create text fields and it's label
+	// Create text fields and its label
 	for idx, fdef := range textFieldsDef {
 		opt := annotator.TextFieldOptions{}
 		textf, err := annotator.NewTextField(page, fdef.Name, fdef.Rect, opt)
@@ -97,7 +96,7 @@ func main() {
 
 		k, err := p.GenerateKDict()
 		if err != nil {
-			fmt.Errorf("Error: %v", err)
+			log.Fatalf("Error: %v", err)
 		}
 
 		k.Alt = core.MakeString(fdef.Tooltip) // Set alternative text for the label.
@@ -137,7 +136,7 @@ func main() {
 	}
 }
 
-// Add Submit button that will submit all fields value.
+// Add Submit button that will submit all field values.
 func addSubmitButton(page *model.PdfPage, form *model.PdfAcroForm) error {
 	optSubmit := annotator.FormSubmitActionOptions{
 		Url: "https://unidoc.io",
@@ -163,7 +162,7 @@ func addSubmitButton(page *model.PdfPage, form *model.PdfAcroForm) error {
 	return nil
 }
 
-// Add Reset button that would reset the specified fields to it's default value.
+// Add Reset button that would reset the specified fields to its default value.
 func addResetButton(page *model.PdfPage, form *model.PdfAcroForm, fields *core.PdfObjectArray) error {
 	optReset := annotator.FormResetActionOptions{
 		Rectangle: draw.Rectangle{

accessibility/pdf_tag_grid.go

@@ -38,20 +38,24 @@ func main() {
 	// Add K dictionary to the struct tree root.
 	structTreeRoot.AddKDict(docK)
 
-	drawGrid(c, docK)
+	err := drawGrid(c, docK)
+	if err != nil {
+		fmt.Printf("Error drawing grid: %v\n", err)
+		return
+	}
 
 	// Set the struct tree root.
 	c.SetStructTreeRoot(structTreeRoot)
 
-	err := c.WriteToFile("pdf_tag_grid.pdf")
+	err = c.WriteToFile("pdf_tag_grid.pdf")
 	if err != nil {
 		fmt.Printf("Error writing to file: %v\n", err)
 		return
 	}
 }
 
 func drawGrid(c *creator.Creator, rootKObj *model.KDict) error {
-	// Create table.
+	// Create grid.
 	grid := c.NewGrid(3)
 	grid.SetMargins(0, 0, 10, 0)
 
@@ -75,12 +79,12 @@ func drawGrid(c *creator.Creator, rootKObj *model.KDict) error {
 	currentRow = grid.NewRow()
 	currentRow.SetSection(creator.GridRowSectionHeader) // Set the first row as a header row.
 
-	// Draw table header.
+	// Draw grid header.
 	drawCell("Align left", creator.CellHorizontalAlignmentLeft)
 	drawCell("Align center", creator.CellHorizontalAlignmentCenter)
 	drawCell("Align right", creator.CellHorizontalAlignmentRight)
 
-	// Draw table content.
+	// Draw grid content.
 	for i := 0; i < 5; i++ {
 		num := i + 1
 
@@ -91,7 +95,7 @@ func drawGrid(c *creator.Creator, rootKObj *model.KDict) error {
 		drawCell(fmt.Sprintf("$%d", num*10), creator.CellHorizontalAlignmentRight)
 	}
 
-	// Draw tabke footer.
+	// Draw grid footer.
 	currentRow = grid.NewRow()
 	currentRow.SetSection(creator.GridRowSectionFooter) // Set the last row as a footer row.
 

accessibility/pdf_tag_link_annot.go

@@ -10,6 +10,7 @@ package main
 
 import (
 	"fmt"
+	"log"
 	"os"
 
 	"github.com/unidoc/unipdf/v4/common/license"
@@ -55,7 +56,10 @@ func main() {
 	heading.SetFontSize(20)
 	chunk := heading.Append("Accessible Links in PDF Documents")
 	chunk.Style.FontSize = 20
-	c.Draw(heading)
+
+	if err := c.Draw(heading); err != nil {
+		log.Fatalf("failed to draw heading: %v", err)
+	}
 
 	// Example 1: Link with descriptive text (no Alt needed)
 	p1 := c.NewStyledParagraph()
@@ -76,7 +80,10 @@ func main() {
 		AltText: altText,
 		MCID:    1,
 	})
-	c.Draw(p1)
+
+	if err := c.Draw(p1); err != nil {
+		log.Fatalf("failed to draw paragraph: %v", err)
+	}
 
 	docK.AddKChild(annot)
 
@@ -97,7 +104,10 @@ func main() {
 		AltText: altText,
 		MCID:    2,
 	})
-	c.Draw(p2)
+
+	if err := c.Draw(p2); err != nil {
+		log.Fatalf("failed to draw paragraph: %v", err)
+	}
 
 	docK.AddKChild(annot)
 
@@ -117,7 +127,10 @@ func main() {
 		AltText: altText,
 		MCID:    3,
 	})
-	c.Draw(p3)
+
+	if err := c.Draw(p3); err != nil {
+		log.Fatalf("failed to draw paragraph: %v", err)
+	}
 
 	docK.AddKChild(annot)
 
@@ -136,7 +149,10 @@ func main() {
 		AltText: altText,
 		MCID:    4,
 	})
-	c.Draw(p4)
+
+	if err := c.Draw(p4); err != nil {
+		log.Fatalf("failed to draw paragraph: %v", err)
+	}
 
 	docK.AddKChild(annot)
 

accessibility/pdf_tag_list.go

@@ -80,7 +80,9 @@ func main() {
 		}
 	}
 
-	c.Draw(list)
+	if err := c.Draw(list); err != nil {
+		log.Fatalf("failed to draw list: %v", err)
+	}
 
 	// Set the struct tree root.
 	c.SetStructTreeRoot(structTreeRoot)

accessibility/pdf_tag_table.go

@@ -46,7 +46,10 @@ func main() {
 	// Add K dictionary to the struct tree root.
 	structTreeRoot.AddKDict(docK)
 
-	drawTable(c, docK)
+	if err := drawTable(c, docK); err != nil {
+		fmt.Printf("Error drawing table: %v\n", err)
+		return
+	}
 
 	// Set the struct tree root.
 	c.SetStructTreeRoot(structTreeRoot)