Section:

Customizing the scale of PDF measurement tool

Each of the measurement tools and measurement annotations has a scale ratio and precision. These properties can be changed using the UI or programmatically.

Setting scale and precision with the UI

To set the measurement properties, select a tool or an annotation, the current scale will show in the overlay.

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Click it will open the dropdown menu showing all the existing scales. The current scale is highlighted with blue color.

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Click another scale, or click the Add New Scale button to create a new scale, and then it will be applied to the current tool or annotation.

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In the Scale Modal above, click the Calibrate button to calibrate the scale and apply.

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Setting scale and precision programmatically

You can take the same approach as shown in the Customizing tools guide to set measurement properties. Measurement related tool names include: AnnotationCreateDistanceMeasurement, AnnotationCreatePerimeterMeasurement and AnnotationCreateAreaMeasurement, etc.. You can view the list of valid tool names. The following example sets the scale and precision of the distance measurement tool:

1WebViewer(...)
2  .then(instance => {
3    const { documentViewer } = instance.Core;
4    const distanceMeasurementTool = documentViewer.getTool('AnnotationCreateDistanceMeasurement');
5
6    distanceMeasurementTool.setStyles({
7      // value of Scale is an array that is consisted of two arrays
8      // the first element in each array is the scale ratio and the second element is the unit.
9      // valid units are: mm, cm, m, km, mi, yd, ft, in and pt
10      // the following array means that for the annotations created by the distance measurement tool, 0.25 inches on the document is equal to 1 inch in the real world
11      Scale: [[0.25, 'in'], [1, 'in']],
12
13      // value of Precision is a number that means how many decimal places the calculated value should have
14      Precision: 0.001
15    });
16  });

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Getting scale and precision programmatically

The following example logs the precision and scale of the distance measurement tool:

1WebViewer(...)
2  .then(instance => {
3    const { documentViewer } = instance.Core;
4    const distanceMeasurementTool = documentViewer.getTool('AnnotationCreateDistanceMeasurement');
5
6    console.log(distanceMeasurementTool.defaults.Scale);
7    console.log(distanceMeasurementTool.defaults.Precision);
8  });

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