display（）似乎只能在調整大小時調用

Question

基本上，我實現的旋轉只在屏幕被調整大小期間被繪製到屏幕上。爲了調試，我在display（）函數中插入了一個print，輸出角度。在運行程序時，它只顯示display（）的兩次迭代的輸出，然後在隨後調整屏幕大小的過程中再次顯示輸出。 這使我相信display（）只會被調用兩次？ 我已經在下面發佈了相關回調，但是讓我知道是否需要其他代碼。

float angle = 0.0f; 
float increment = 0.5f; 

@Override 
    public void init(GLAutoDrawable drawable) 
    { 
     GL2 gl = drawable.getGL().getGL2();  // get the OpenGL graphics context 
     glu = new GLU();       // get GL Utilities 
     glut = new GLUT(); 
     gl.glClearColor(1.0f, 1.0f, 1.0f, 1.0f); // set background (clear) color 

     gl.glClearDepth(1.0f);  // set clear depth value to farthest 
     gl.glEnable(GL_DEPTH_TEST); // enables depth testing 
     gl.glDepthFunc(GL_LEQUAL); // the type of depth test to do 

     gl.glShadeModel(GL_SMOOTH); // blends colors nicely, and smoothes out lighting 

     calculateSpecks(noSpecks); 
    } 

    @Override 
    public void dispose(GLAutoDrawable drawable) 
    { 

    } 

    @Override 
    public void display(GLAutoDrawable drawable) 
    { 
     GL2 gl = drawable.getGL().getGL2(); // get the OpenGL 2 graphics context 
     gl.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear color and depth buffers 
     gl.glColor3f(1.0f, 0.0f, 0.0f); 
     gl.glLoadIdentity(); 

     glu.gluLookAt(1.0, 0.0, 3.0, 0.0, 0.0, -0.5, 0.0, 1.0, 0.0); 

     gl.glRotatef(angle, 1.0f, 0.0f, 0.0f); 
     angle+=increment; 

     //setLighting(gl); 
     glut.glutWireSphere(1, 32, 32); 

     gl.glColor3f(0.0f, 0.0f, 0.0f); 

     for(int i = 0; i < noSpecks; i++) 
     { 
      gl.glBegin(GL.GL_POINTS); 
       gl.glVertex3i(specks[i][0], specks[i][1], specks[i][2]); 
      gl.glEnd(); 
     } 

    } 

    @Override 
    public void reshape(GLAutoDrawable drawable, int x, int y, int width, 
      int height) 
    { 
      GL2 gl = drawable.getGL().getGL2(); // get the OpenGL 2 graphics context 

      if (height == 0) height = 1; // prevent divide by zero 
      float aspect = (float)width/height; 

      // Set the view port (display area) to cover the entire window 
      gl.glViewport(0, 0, width, height); 

      // Setup perspective projection, with aspect ratio matches viewport 
      gl.glMatrixMode(GL_PROJECTION); // choose projection matrix 
      gl.glLoadIdentity();    // reset projection matrix 
      glu.gluPerspective(45.0, aspect, 0.1, 100.0); // fovy, aspect, zNear, zFar 

      // Enable the model-view transform 
      gl.glMatrixMode(GL_MODELVIEW); 
      gl.glLoadIdentity(); // reset 
    } 

Answer 1

剛纔意識到，我忘記了使用動畫器是強制驅動JOGL中的display（）函數的。解決問題