JOGL 3D长方体

17 Mar 2025 | 阅读 2 分钟

在前一节中，我们创建了一个内部镂空的立方体。现在，我们将创建一个实心的长方体并旋转它。旋转时，长方体也会在整个屏幕上移动。

要创建实心图形 3D 对象，需要启用深度测试。gl.glEnable( GL2.GL_DEPTH_TEST ) 方法用于启用它。

JCuboid.java

package com.javatpoint.jogl;

import javax.media.opengl.*;
import javax.media.opengl.awt.GLCanvas;
import javax.media.opengl.glu.GLU;

import javax.swing.JFrame;

import com.jogamp.opengl.util.FPSAnimator;

public class JCuboid implements GLEventListener {

  
   private GLU glu = new GLU();
   private float rotation = 0.0f;
      
   @Override
   public void display( GLAutoDrawable drawable ) {
	
      final GL2 gl = drawable.getGL().getGL2();
      gl.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT );
      gl.glLoadIdentity();
      gl.glTranslatef( 0f, 0f, -5.0f ); 

      
      gl.glRotatef(rotation, 1.0f, 1.0f, 1.0f); 
 
    
      
      
      gl.glBegin(GL2.GL_QUADS); 
      gl.glColor3f(1f,0f,0f); //red color
      
      //Top
      gl.glVertex3f(-1f, 0.8f, 0.5f); 
      gl.glVertex3f(-0.5f, 0.8f, 0.5f); 
      gl.glVertex3f(-1f,0.5f,0.5f ); 
      gl.glVertex3f(-0.5f, 0.5f,0.5f ); 
		
      //Bottom
      gl.glVertex3f( -1f,0.8f, 0.9f ); 
      gl.glVertex3f( -1f, 0.5f, 0.9f ); 
      gl.glVertex3f( -0.5f, 0.5f, 0.9f ); 
      gl.glVertex3f(-0.5f, 0.8f, 0.9f ); 

      //Front
      gl.glVertex3f(-0.5f, 0.8f, 0.5f ); 
      gl.glVertex3f( -1f, 0.8f, 0.5f ); 
      gl.glVertex3f( -1f, 0.8f, 0.9f );
      gl.glVertex3f( -0.5f, 0.8f, 0.9f);
      //Back
 
      gl.glVertex3f(-0.5f,0.5f, 0.5f); 
      gl.glVertex3f( -1f, 0.5f, 0.5f); 
      gl.glVertex3f( -1f, 0.5f, 0.9f ); 
      gl.glVertex3f( -0.5f, 0.5f, 0.9f ); 
      
      //Left
      gl.glVertex3f(-0.5f,0.8f, 0.9f   ); 
      gl.glVertex3f(  -0.5f, 0.8f, 0.5f ); 
      gl.glVertex3f(-0.5f,0.5f, 0.9f);
      gl.glVertex3f( -0.5f, 0.5f, 0.5f);

      //Right
      gl.glVertex3f( -1f, 0.8f, 0.9f); 
      gl.glVertex3f( -1f, 0.8f, 0.5f ); 
      gl.glVertex3f( -1f, 0.5f, 0.5f); 
      gl.glVertex3f(-1f, 0.5f, 0.9f); 
      gl.glEnd(); 
      gl.glFlush();
		
      rotation -= 0.15f;
   }
   
   @Override
   public void dispose( GLAutoDrawable drawable ) {
      
   }
   
   @Override
   public void init( GLAutoDrawable drawable ) {
	
      final GL2 gl = drawable.getGL().getGL2();
      gl.glEnable( GL2.GL_DEPTH_TEST );
    
   }
      
   @Override
   public void reshape( GLAutoDrawable drawable, int x, int y, int width, int height ) {
	

      final GL2 gl = drawable.getGL().getGL2();
      if( height<=0 )
         height = 1;
			
      final float h = ( float ) width / ( float ) height;
      gl.glViewport( 0, 0, width, height );
      gl.glMatrixMode( GL2.GL_PROJECTION );
      gl.glLoadIdentity();
		
      glu.gluPerspective( 45.0f, h, 1.0, 20.0 );
      gl.glMatrixMode( GL2.GL_MODELVIEW );
      gl.glLoadIdentity();
   }
      
   public static void main( String[] args ) {
	
      final GLProfile gp = GLProfile.get( GLProfile.GL2 );
      GLCapabilities cap = new GLCapabilities( gp );
      
      
      final GLCanvas gc = new GLCanvas( cap );
      JCuboid cuboid = new JCuboid();
		
      gc.addGLEventListener( cuboid );
      gc.setSize( 100, 100 );
		
      final JFrame frame = new JFrame ( " JOGL Cuboid" );
      frame.add(gc);  
      frame.setSize(500,400);  
      frame.setVisible(true); 
      final FPSAnimator animator = new FPSAnimator(gc, 300,true);
		
      animator.start();
   }}

输出