java - 使用 gl.glrotatef 旋转对象

Question

我正在尝试使用 opengl 和命令 gl.glroate 让对象旋转，但似乎没有发生任何事情，任何人都可以告诉我哪里出了问题吗？下面是代码

import javax.media.opengl.*;
import javax.media.opengl.glu.GLU;
import javax.swing.JFrame;
import com.sun.opengl.util.Animator;
import com.sun.opengl.util.FPSAnimator;

public class Cube2 implements GLEventListener {

      private float Rotate = 0.0f;

    private static final GLU glu = new GLU ();

    /**
     * @param args
     */
    public static void main(String[] args){
        JFrame frame = new JFrame("A simple JOGL demo");
        GLCanvas canvas = new GLCanvas ();
        canvas.addGLEventListener(new Cube2());
        frame.add(canvas);
        frame.setSize(640, 480);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

        Animator animator = new FPSAnimator(canvas, 60);
        animator.add(canvas);
    }

@Override
public void display (GLAutoDrawable glDrawable){
    final GL gl = glDrawable.getGL();
    //gl.glClear(GL.GL_COLOR_BUFFER_BIT);
    gl.glClear(GL.GL_DEPTH_BUFFER_BIT);
    gl.glLoadIdentity();
    gl.glTranslatef(0.0f, 0.0f, -7.0f);
    gl.glRotatef(Rotate++, 1.0f, 0.0f, 0.0f); 
    gl.glRotatef(Rotate++, 0.0f, 1.0f, 0.0f);
    gl.glRotatef(Rotate++, 0.0f, 0.0f, 1.0f);


    gl.glBegin(GL.GL_TRIANGLES);

    //Counter Clockwise Front Face 1 
        gl.glColor3f(0.0f, 1.0f, 0.0f); //Green
        gl.glVertex3f (1.0f, 1.0f, 0.0f); //Top 
        gl.glVertex3f(-1.0f, 1.0f, 0.0f); // left to right      
        gl.glVertex3f (-1.0f, -1.0f, 0.0f); //left
        gl.glVertex3f (-1.0f, -1.0f, -0.0f); //left         
        gl.glVertex3f(1.0f, -1.0f, -0.0f);  //left to right     
        gl.glVertex3f (1.0f, 1.0f, -0.0f);  //left  

    // Right Face 2
        gl.glColor3f(1.0f, 0.0f, 1.0f); //Pink
        gl.glVertex3f (1.0f, 1.0f, 0.0f);       
        gl.glVertex3f(1.0f, -1.0f, -0.0f);      
        gl.glVertex3f (1.0f, 1.0f, 1.0f);       
        gl.glVertex3f (-1.0f, -1.0f, -0.0f);        
        gl.glVertex3f(-1.0f, 1.0f, 0.0f);       
        gl.glVertex3f (-1.0f, -1.0f, -1.0f);        

    gl.glEnd();

}

@Override
public void displayChanged (GLAutoDrawable arg0, boolean arg1, boolean arg2) 
{
    //TODO Auto-generated method stub
}

@Override
public void init(GLAutoDrawable glDrawable) 
{
    final GL gl = glDrawable.getGL();

    int width = 640;
    int height = 480;

    //Set the state of out new OpenGL context
    gl.glViewport(0, 0, width, height);
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glLoadIdentity();

    glu.gluPerspective(45.0f,(float)(width)/(float)(height),1.0f,100.0f);
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glLoadIdentity();

    gl.glShadeModel(GL.GL_SMOOTH);                                  //Enable Smooth Shading
    gl.glClearColor(0.0f, 0.0f, 0.0f, 0.5f);                        //Black Background
    gl.glClearDepth(1.0f);                                          //Depth Buffer Setup
    gl.glEnable(GL.GL_DEPTH_TEST);                                  //Enables Depth Testing
    gl.glDepthFunc(GL.GL_LEQUAL);                                   //The Type of Depth Testing To Do
    gl.glEnable(GL.GL_CULL_FACE);                                   //Start culling back faces
    gl.glHint(GL.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST);     //Really Nice Perspective Calculations
}

@Override
public void reshape (GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4){
    //TODO Auto-generated method stub
}
}

提前感谢您的帮助

Answer 1

1. 您应该首先添加

   animator.start();

   以便开始渲染。

2. 您正在使用不再维护的 JOGL 1。这肯定行不通。您应该遵循 Jogamp.org 上的教程。

3. 您正在使用专有 api，例如 import com.sun.opengl.util.Animator；首先。如果您希望获得无权使用该 api 的人的帮助，那么这是一个糟糕的选择。正如我所说，您可以访问 jogamp.org 获取该软件包的开源替代品。