Example 23.19: The Sphere subclass

package elharo.vrml;

public class Sphere extends shape {

  double radius = 1.0;
 
  public Sphere (double radius) {
    this.radius = radius;
  }
  
  public Sphere ( double x, 
   double y, double z, double radius) {
    this.x = x;
    this.y = y;
    this.z = z;
    this.radius = radius;
  }
 
  public void sizeTo(double radius) {
 
    this.radius = radius;
    
  }
  
  public void sizeRelative(double radius) {
 
    this.radius += radius;

  }

  public String draw() {
  
    String node1 = "Translation { \n" +
      "translation " + x + " " + y + " " + z + 
      "\n}\n\n";
      
    String node2 = "Cylinder {\n" + 
      "  radius " + radius + 
      "\n}\n\n";
  
    String node3 = "Translation { \n" +
      "  translation " + -x + " " + -y + " " + -z + 
      "\n" + "}\n\n"; 

  
    return node1 + node2 + node3;
    
  }

}