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PDFTron SDK has built-in tools allowing you to create measurement annotations and provides a UI to modify common properties.
By default, creating and editing measurement annotations in the drop-in components DocumentActivity and PdfViewCtrlTabHostFragment are automatically enabled unless disabled using
ToolManagerBuilder. You can learn more about configuring ToolManager here.
To create a measurement annotations, tap and hold on an area of the PDF without any text or annotations to bring up the long-press quick menu. Then find a group called
Measure in the overflow menu.
There are three measurement tools:
Snapping is useful when you want to precisely place annotations in documents by snapping them to lines & objects. The point snapping API can be used to easily place annotations to the exact location.
This is disabled by default and can be enabled as follows:
The Calibrate menu option for measurement annotations allows you to determine a PDF's scale, enabling accurate measurements.
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