PDF Highlights Annotation
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Text Markup Annotations shall appear as highlights, underlines, strikeouts, or jagged (“squiggly”) underlines in the text of a document. When opened, they shall display a pop-up window containing the text of the associated note.
The properties of the text markup annotations in the PDF document can be edited using the properties window provided in the PDF viewer control. The color, opacity, author, and subject of the text markup annotation can be modified.
Its is possible to get or set the settings of the highlight annotations using the highlightSettings property. The highlightSettings property is used to set the color, opacity, author, subject, modifiedDate and isLocked properties of the highlight annotations.
Also possible to get or set the settings of the strikethrough annotations using the strikethroughSettings property. The strikethroughSettings property is used to set the color, opacity, author, subject, modifiedDate, and isLocked properties of the strikethrough annotations.
The next feature is the ability to get or set the settings of the underline annotations using the underlineSettings property. The underlineSettings property is used to set the color, opacity, author, subject, modifiedDate, and isLocked properties of the underline annotations.
Add Text Markup Annotation
In order to add an Text Markup Annotation to the PDF document, we need to perform the following actions:
- Load the PDF file - new Document object.
- Create annotations:
- HighlightAnnotation and set parameters (title, color).
- StrikeOutAnnotation and set parameters (title, color).
- SquigglyAnnotation and set parameters (title, color).
- UnderlineAnnotation and set parameters (title, color).
- After we should add all annotations to the page.
package com.aspose.pdf.examples;
import java.util.*;
import com.aspose.pdf.*;
public class ExampleTextMarkupAnnotation {
// The path to the documents directory.
private static String _dataDir = "/home/admin1/pdf-examples/Samples/";
public static void AddTextMarkupAnnotation() {
try {
// Load the PDF file
Document document = new Document(_dataDir + "sample.pdf");
Page page = document.getPages().get_Item(1);
TextFragmentAbsorber tfa = new TextFragmentAbsorber("PDF");
tfa.visit(page);
// Create annotations
HighlightAnnotation highlightAnnotation = new HighlightAnnotation(page,
tfa.getTextFragments().get_Item(1).getRectangle());
highlightAnnotation.setTitle("Aspose User");
highlightAnnotation.setColor(Color.getLightGreen());
StrikeOutAnnotation strikeOutAnnotation = new StrikeOutAnnotation(page,
tfa.getTextFragments().get_Item(2).getRectangle());
strikeOutAnnotation.setTitle("Aspose User");
strikeOutAnnotation.setColor(Color.getBlue());
SquigglyAnnotation squigglyAnnotation = new SquigglyAnnotation(page,
tfa.getTextFragments().get_Item(3).getRectangle());
squigglyAnnotation.setTitle("Aspose User");
squigglyAnnotation.setColor(Color.getRed());
UnderlineAnnotation underlineAnnotation = new UnderlineAnnotation(page,
tfa.getTextFragments().get_Item(4).getRectangle());
underlineAnnotation.setTitle("Aspose User");
underlineAnnotation.setColor(Color.getViolet());
// Add annotation to the page
page.getAnnotations().add(highlightAnnotation);
page.getAnnotations().add(squigglyAnnotation);
page.getAnnotations().add(strikeOutAnnotation);
page.getAnnotations().add(underlineAnnotation);
document.save(_dataDir + "sample_mod.pdf");
} catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
}
If you want to highlight a multi-line fragment you should use advanced example:
/// <summary>
/// Advanced example for you want to highlight a multi-line fragment
/// </summary>
public static void AddHighlightAnnotationAdvanced() {
Document document = new Document(_dataDir + "sample_mod.pdf");
Page page = document.getPages().get_Item(1);
TextFragmentAbsorber tfa = new TextFragmentAbsorber("Adobe\\W+Acrobat\\W+Reader", new TextSearchOptions(true));
tfa.visit(page);
for (TextFragment textFragment : tfa.getTextFragments()) {
HighlightAnnotation highlightAnnotation = HighLightTextFragment(page, textFragment, Color.getYellow());
page.getAnnotations().add(highlightAnnotation);
}
document.save(_dataDir + "sample_mod.pdf");
}
private static HighlightAnnotation HighLightTextFragment(Page page, TextFragment textFragment, Color color) {
HighlightAnnotation ha;
if (textFragment.getSegments().size() == 1) {
ha = new HighlightAnnotation(page, textFragment.getSegments().get_Item(1).getRectangle());
ha.setTitle("Aspose User");
ha.setColor(color);
ha.setModified(new Date());
Rectangle rect = textFragment.getSegments().get_Item(1).getRectangle();
ha.setQuadPoints(
new Point[] { new Point(rect.getLLX(), rect.getURY()), new Point(rect.getURX(), rect.getURY()),
new Point(rect.getLLX(), rect.getLLY()), new Point(rect.getURX(), rect.getLLY()) });
return ha;
}
int offset = 0;
Point[] quadPoints = new Point[textFragment.getSegments().size() * 4];
for (TextSegment segment : textFragment.getSegments()) {
Rectangle r = segment.getRectangle();
quadPoints[offset + 0] = new Point(r.getLLX(), r.getURY());
quadPoints[offset + 1] = new Point(r.getURX(), r.getURY());
quadPoints[offset + 2] = new Point(r.getLLX(), r.getLLY());
quadPoints[offset + 3] = new Point(r.getURX(), r.getLLY());
offset += 4;
}
double llx = quadPoints[0].getX();
double lly = quadPoints[0].getY();
double urx = quadPoints[0].getX();
double ury = quadPoints[0].getY();
for (Point pt : quadPoints) {
if (llx > pt.getX())
llx = pt.getX();
if (lly > pt.getY())
lly = pt.getY();
if (urx < pt.getX())
urx = pt.getX();
if (ury < pt.getY())
ury = pt.getY();
}
ha = new HighlightAnnotation(page, new Rectangle(llx, lly, urx, ury));
ha.setTitle("Aspose User");
ha.setColor(color);
ha.setModified(new Date());
ha.setQuadPoints(quadPoints);
return ha;
}
/// <summary>
/// How to get a Highlighted Text
/// </summary>
public static void GetHighlightedText() {
// Load the PDF file
Document document = new Document(_dataDir + "sample_mod.pdf");
Page page = document.getPages().get_Item(1);
AnnotationSelector annotationSelector1 = new AnnotationSelector(
new HighlightAnnotation(page, Rectangle.getTrivial()));
page.accept(annotationSelector1);
List<Annotation> highlightAnnotations = annotationSelector1.getSelected();
for (Annotation ta : highlightAnnotations) {
System.out.println("[" + ((HighlightAnnotation) ta).getMarkedText() + "]");
}
}
Get Text Markup Annotation
Please try using the following code snippet to Get Text Markup Annotation from PDF document.
public static void GetTextMarkupAnnotation() {
// Load the PDF file
Document document = new Document(_dataDir + "sample_mod.pdf");
Page page = document.getPages().get_Item(1);
AnnotationSelector annotationSelector1 = new AnnotationSelector(
new HighlightAnnotation(page, Rectangle.getTrivial()));
page.accept(annotationSelector1);
AnnotationSelector annotationSelector2 = new AnnotationSelector(
new SquigglyAnnotation(page, Rectangle.getTrivial()));
page.accept(annotationSelector2);
List<Annotation> textMarkupAnnotations = annotationSelector1.getSelected();
textMarkupAnnotations.addAll(annotationSelector2.getSelected());
// print results
for (Annotation ta : textMarkupAnnotations) {
System.out.printf("[" + ta.getAnnotationType() + ta.getRect() + "]");
}
}
Delete Text Markup Annotation
The following code snippet shows how to Delete Text Markup Annotation from PDF file.
public static void DeleteTextMarkupAnnotation() {
// Load the PDF file
Document document = new Document(_dataDir + "sample_mod.pdf");
Page page = document.getPages().get_Item(1);
AnnotationSelector annotationSelector1 = new AnnotationSelector(
new HighlightAnnotation(page, Rectangle.getTrivial()));
page.accept(annotationSelector1);
AnnotationSelector annotationSelector2 = new AnnotationSelector(
new SquigglyAnnotation(page, Rectangle.getTrivial()));
page.accept(annotationSelector2);
List<Annotation> textMarkupAnnotations = annotationSelector1.getSelected();
textMarkupAnnotations.addAll(annotationSelector2.getSelected());
// print results
for (Annotation ta : textMarkupAnnotations) {
page.getAnnotations().delete(ta);
}
document.save(_dataDir + "sample_del.pdf");
}