Calibrate Method

Sets the ruler calibration scale.

Syntax

JavaScript

 function Leadtools.Annotations.Core.AnnContainerMapper.calibrate( 
   sourceLength ,
   sourceUnit ,
   destinationLength ,
   destinationUnit 
)

Parameters

Parameter	Type	Description
sourceLength	LeadLengthD	Known source length value
sourceUnit	AnnUnit	Units of sourceLength
destinationLength	LeadLengthD	What the destination length must be
destinationUnit	AnnUnit	Units of destinationUnit

Remarks

This method will use the parameters to calculate a new value for CalibrationScale. This value is used afterwards by all the existing ruler and new ruler objects created in this container.

Calibrating a ruler means assigning a specific length to it. For example, on a digital X-ray of a hand, you may draw an annotation ruler object along one of the fingers. You know that this distance is supposed to be exactly 6.5 cm. Using the new calibration functionality you can calibrate this ruler, all existing rulers, and all newly created rulers so that they would precisely measure this distance to be 6.5 cm. This is accomplished by first drawing a ruler on the container till it matches exactly the length of the finger - ignoring the values shown - then using Calibrate as shown in the example.

Example

This example will draw a ruler with a length that is assumed is 6.5cm, it then uses Calibrate to set the mapper calibration scale.

JavaScript

example: function SiteLibrary_DefaultPage$example() {
   // Add a ruler with a length of 1 inch to the container
   var container = this._automation.get_container();
   var inch = 720;
   var rulerObj = new lt.Annotations.Core.AnnPolyRulerObject();
   rulerObj.get_points().add(lt.LeadPointD.create(1 * inch, 1 * inch));
   rulerObj.get_points().add(lt.LeadPointD.create(2 * inch, 1 * inch));
   rulerObj.set_stroke(lt.Annotations.Core.AnnStroke.create(lt.Annotations.Core.AnnSolidColorBrush.create("red"), lt.LeadLengthD.create(1)));
   rulerObj.set_showGauge(true);
   rulerObj.set_showTickMarks(true);
   rulerObj.set_measurementUnit(lt.Annotations.Core.AnnUnit.inch);
   container.get_children().add(rulerObj);

   // Show the ruler
   this._automation.invalidate(lt.LeadRectD.get_empty());
   alert("Ruler to calibrate, length is 1 inch");

   // Get the length of the ruler
   var point1 = rulerObj.get_points().get_item(0);
   var point2 = rulerObj.get_points().get_item(1);
   var length = Math.sqrt(Math.pow(Math.abs(point2.get_x() - point1.get_x()), 2) + Math.pow(Math.abs(point2.get_y() - point1.get_y()), 2));

   // Calibrate the container mapper
   container.get_mapper().calibrate(
      lt.LeadLengthD.create(length),           // Source length
      lt.Annotations.Core.AnnUnit.unit,        // Source unit (container units)
      lt.LeadLengthD.create(6.5),              // Destination length
      lt.Annotations.Core.AnnUnit.centimeter); // Destination unit 

   // Use the Centimeters as the measurement unit in the ruler
   rulerObj.set_measurementUnit(lt.Annotations.Core.AnnUnit.centimeter);

   // Now rulerObj should show 6.5 Centimeter as its length
   this._automation.invalidate(lt.LeadRectD.get_empty());
   alert("Calibrated, length is 6.5 cm");
},

Calibrate Method

Parameters

Reference