org.jcae.opencascade/src-java-test/org/jcae/opencascade/jni/Dimensions.java

   1 package org.jcae.opencascade.jni;
   2
   3 import static org.junit.Assert.*;
   4 import org.junit.Test;
   5
   6 /**
   7  * Example of BRepGProp and BRepBndLib
   8  * @author Jerome Robert
   9  */
  10 public class Dimensions
  11 {
  12         @Test public void torus()
  13         {
  14                 // Create a shape for the example (a torus)
  15                 double[] axis=new double[]{
  16                         0,0,0,  // position
  17                         0,0,1}; // direction
  18                 double R = 3.0;
  19                 double r = 1.0;
  20                 TopoDS_Shape torus=new BRepPrimAPI_MakeTorus(axis, R, r).shape();
  21
  22                 // Compute the bounding box of the shape
  23                 Bnd_Box bbox = new Bnd_Box();
  24                 BRepBndLib.add(torus, bbox);
  25                 double[] bboxValues = bbox.get();
  26
  27                 // Display the bounding box
  28                 System.out.println("Xmin="+bboxValues[0]);
  29                 System.out.println("Ymin="+bboxValues[1]);
  30                 System.out.println("Zmin="+bboxValues[2]);
  31                 System.out.println("Xmax="+bboxValues[3]);
  32                 System.out.println("Ymax="+bboxValues[4]);
  33                 System.out.println("Zmax="+bboxValues[5]);
  34
  35                 // Display various other properties
  36                 GProp_GProps property=new GProp_GProps();
  37                 BRepGProp.linearProperties(torus, property);
  38                 System.out.println("length="+property.mass());
  39                 assertEquals(property.mass(), 4.0*Math.PI*(R+2.0*r), 1.e-6);
  40
  41                 // If Eps is argument is absent, precision is quite poor
  42                 BRepGProp.surfaceProperties(torus, property, 1.e-2);
  43                 System.out.println("surface="+property.mass());
  44                 assertEquals(property.mass(), 4.0*Math.PI*Math.PI*R*r, 1.e-6);
  45
  46                 BRepGProp.volumeProperties(torus, property);
  47                 System.out.println("volume="+property.mass());
  48                 assertEquals(property.mass(), 2.0*Math.PI*Math.PI*R*r*r, 1.e-6);
  49
  50         }
  51 }