Caption for Area - Measurement Module

[Daniel_Martin_Garcia]

Hi guys,

After you create a ruler PDFTron renders a caption with the length of the line, but for the area annotations (Free Shape, Circle or Rectangle ) I cannot find a way to show that value, I mean to keep visible the calculated area as a text over the annotation.

The image below shows an example of the ruler, with the caption visible, and an area, where you cannot see the caption.

Thanks a lot!

[system]

Hello, I’m Ron, an automated tech support bot

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:

• Redact a PDF document - About redactor
• SDF / COS object model - SDF.Obj
• Measure area, distance & perimeter in PDFs using JavaScript
• Code samples to create / generate PDFs using JavaScript

APIs:

• Tools
• Tools. CalloutCreateTool - setEnableAutoSized(enable)
• Tools. Tool - new Tool(docViewer)

Forums:

• Customizing the UI to allow editing of a polygon area measurement after it’s created
• Custom tooltip position
• Xamarin Link Annotations not clickable

[Sardor_Isakov]

Hi Ron,

Circle measurement annotation does not have labels or caption by default.

[Sardor_Isakov]

Hi Daniel,

I replied to our bot named Ron by accident. I gathered more information about labels for these measurement tools.

You can try using this API setCustomDrawHandler on Annotations.EllipseAnnotation
Here is the callback function that is passed to it CustomAnnotationDrawHandler

Here is a possible way for rendering label in circle annotation

Annotations.setCustomDrawHandler(Annotations.EllipseAnnotation, function(ctx, pageMatrix, rotation, options) {
  if (options.annotation.Measure) {
    ctx.fillText(options.annotation.popupComment, options.annotation.X, options.annotation.Y);
  }
  options.originalDraw(ctx, pageMatrix);
});

The reason circle measurement annotation does not have a label is that PDF specification guidelines do not require a label for this annotation type.