JOGL Rotation

by Online Tutorials Library July 14, 2022

JOGL Rotation

In JOGL, an object can be rotated in any direction along any of the three axis. To rotate an object you need to follow the below step: –

Removes the previous state of an object to clear the view. For that you need to clear the color and depth buffer by using the following method: –

Now, reset the project matrix with the help of glLoadIntensity() method
Invoke the glRotatef() method of GLMatrixFunc interface.

Frame per Second Animator Class

The FPSAnimator class is a subclass of Animator class used to rotate an object at the rate of frame per second.

Constructor of FPSAnimator Class

Constructor	Description
FPSAnimator(int fps)	It creates an FPSAnimator with specified value of target frame-per-second.
FPSAnimator(GLAutoDrawabledrawable, int fps)	It creates an FPSAnimator with an intialdrawable to animate and specified value of target frame-per-second.
FPSAnimator(GLAutoDrawabledrawable, int fps, booleanscheduleAtFixedRate)	It creates an FPSAnimator with an intialdrawable to animate, specified value of target frame-per-second and a flag that specifies whether to use fixed-rate scheduling.
FPSAnimator(int fps, booleanscheduleAtFixedRate)	It creates an FPSAnimator with specified value of target frame-per-second a flag that specifies whether to use fixed-rate scheduling.

JOGL Rotation Example

In this example, we will rotate a triangle.

  package com.tutoraspire.jogl;  import javax.media.opengl.GL2;       import javax.media.opengl.*;  import javax.media.opengl.awt.GLCanvas;     import javax.swing.JFrame;     import com.jogamp.opengl.util.FPSAnimator;     public class JRotation implements GLEventListener {   public float rotation;        @Override   public void display( GLAutoDrawable drawable ) {    final GL2 gl = drawable.getGL().getGL2();   gl.glClear (GL2.GL_COLOR_BUFFER_BIT |  GL2.GL_DEPTH_BUFFER_BIT );            // Clear The Screen And The Depth Buffer   gl.glLoadIdentity();  // Reset The View               //triangle rotation        gl.glRotatef( rotation, 0.0f, 1.0f, 0.0f );        gl.glBegin(GL2.GL_TRIANGLES);             //Green Color  gl.glColor3f( 0.0f,1.0f,0.0f );   gl.glVertex2d(0,0.5);  gl.glVertex2d(-0.5,-0.5);  gl.glVertex2d(0.5,-0.5);    gl.glEnd();    gl.glFlush();         //Assign the angle  rotation += 0.6f;       }        @Override   public void dispose( GLAutoDrawable arg0 ) {         //method body      }        @Override   public void init( GLAutoDrawable arg0 ) {         // method body      }       @Override   public void reshape( GLAutoDrawable drawable, int x, int y, int width, int height ) {      }  public static void main( String[] args ) {    final GLProfile gp  = GLProfile.get(GLProfile.GL2 );   GLCapabilities cap  = new GLCapabilities(gp);    final GLCanvas gc = new GLCanvas(cap);   JRotation jr = new JRotation();   gc.addGLEventListener(jr);   gc.setSize( 400, 400 );      final JFrame frame = new JFrame(“JOGL Rotation”);    frame.add(gc);  frame.setSize(500,400);  frame.setVisible(true);     final FPSAnimator animator = new FPSAnimator(gc, 400,true);   animator.start();        }     }   

Output:

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