exploring/transformations/transformations.java

Refer to the Transformation Example.

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// Copyright (C) 2008-2014, Roman Lygin. All rights reserved.
// Copyright (C) 2014-2023, CADEX. All rights reserved.
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// This file is part of the CAD Exchanger software.
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import cadex.*;
 
import java.util.Stack;
 
public class transformations {
    static {
        try {
            System.loadLibrary("CadExCore");
        } catch (UnsatisfiedLinkError e) {
            System.err.println("Native code library failed to load.\n" + e);
            System.exit(1);
        }
    }
 
    public static void main(String[] args) {
        String aKey = LicenseKey.Value();
 
        // Activate the license (aKey must be defined in LicenseKey.java)
        if (!LicenseManager.Activate(aKey)) {
            System.out.println("Failed to activate CAD Exchanger license.");
            System.exit(1);
        }
 
        if (args.length != 1) {
            System.out.println("Usage: " + " <input_file>, where:");
            System.out.println("    <input_file>  is a name of the XML file to be read");
            System.exit(1);
        }
 
        String aSource = args[0];
 
        ModelData_Model aModel = new ModelData_Model();
 
        if (!new ModelData_ModelReader().Read(new Base_UTF16String(aSource), aModel)) {
            System.out.println("Failed to read the file");
            System.exit(1);
        }
 
        // Visitor to check and print trasformations of instances
        InstancesTransformationsVisitor aVisitor = new InstancesTransformationsVisitor();
        aModel.Accept(aVisitor);
    }
}
 
class InstancesTransformationsVisitor extends ModelData_Model.VoidElementVisitor {
    public InstancesTransformationsVisitor() {
        // We are going to multiply each matrix to produce transformations relative to the SceneGraph root
        ModelData_Transformation anIdentity = new ModelData_Transformation();
        myTransformationMatrix.push(anIdentity);
    }
 
    @Override
    public boolean VisitEnter(ModelData_Instance theInstance) {
        if (theInstance.HasTransformation()) {
            ModelData_Transformation aTrsf = theInstance.Transformation();
            myTransformationMatrix.push(myTransformationMatrix.peek().Multiplied(aTrsf));
        } else {
            ModelData_Transformation anIdentity = new ModelData_Transformation();
            myTransformationMatrix.push(anIdentity);
        }
 
        PrintTransformation(theInstance.Name());
 
        return true;
    }
 
    @Override
    public void VisitLeave(ModelData_Instance theInstance) {
        myTransformationMatrix.pop();
    }
 
    private void PrintTransformation(Base_UTF16String theName) {
        // Print instance name
        if (theName.IsEmpty()) {
            theName = new Base_UTF16String("noName");
        }
        System.out.println("Instance " + theName + " has transformations:");
 
        ModelData_Transformation.RotationPart aR = myTransformationMatrix.peek().GetRotationPart();
 
        ModelData_Vector aTranslation = myTransformationMatrix.peek().TranslationPart();
        System.out.println("| " + aR.v00 + " " + aR.v01 + " " + aR.v02 + " " + aTranslation.X() + " |");
        System.out.println("| " + aR.v10 + " " + aR.v11 + " " + aR.v12 + " " + aTranslation.Y() + " |");
        System.out.println("| " + aR.v20 + " " + aR.v21 + " " + aR.v22 + " " + aTranslation.Z() + " |");
    }
 
    private Stack<ModelData_Transformation> myTransformationMatrix = new Stack<>();
}