RotationTest.java

Below is the syntax highlighted version of RotationTest.java from § Standard Draw 3D.

/******************************************************************************
 *  Compilation:  javac RotationTest.java
 *  Execution:    java RotationTest
 *
 * Draws a cone inside a wireframe sphere, and animates them rotating
 * in different directions.
 * 
 * Keywords: Cone, Sphere, Wireframe, Rotation
 ******************************************************************************/

public class RotationTest {
    public static void main(String[] args) {
        
        // Sets the scale
        StdDraw3D.setScale(-1, 1);
        
        // Initializes the angles of rotation
        double cone_xA = 0;
        double sphere_yA = 0;
        
        while (true) {
            
            StdDraw3D.clear(StdDraw3D.WHITE);
            
            // Draws a wireframe sphere rotated along the y-axis
            StdDraw3D.setPenColor(StdDraw3D.BLUE);
            StdDraw3D.wireSphere(0, 0, 0, 1.0, 0, sphere_yA, 0);
            
            // Draws a translucent cone rotated along the x-axis
            StdDraw3D.setPenColor(StdDraw3D.RED, 100);
            StdDraw3D.cone(0, 0, 0, .5, 1, cone_xA, 0, 0);
            
            // Increments the rotation angles.
            sphere_yA += 0.4;
            cone_xA   += 0.2;
            
            StdDraw3D.show(30);
        }
    }
}