我是Java和OpenGL的新手。
我有一个听众，我想弄清楚它为什么不起作用？当我按下一个键绝对没有任何反应。我所指的听众是：
@Override
public void keyTyped(KeyEvent e)
{
// TODO Auto-generated method stub
char key= e.getKeyChar();
System.out.printf("Key typed: %c\n", key);
}
这是我的档案。
HelloOpenGL.java
package helloOpenGL;
/*************************************************************************************
* IMPORTS
**************************************************************************************/
import java.awt.BorderLayout;
import java.awt.Frame;
import com.jogamp.opengl.GLCapabilities;
import com.jogamp.opengl.awt.GLCanvas;
import com.jogamp.opengl.util.Animator;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
/*************************************************************************************
* Class HelloOpenGL
**************************************************************************************/
public class HelloOpenGL extends Frame
{
// Animator? Unneeded??
static Animator anim = null;
/*************************************************************************************
* setupJOGL
*
* Method that sets up Java openGL??
**************************************************************************************/
private void setupJOGL()
{
GLCapabilities caps = new GLCapabilities(null);
caps.setDoubleBuffered(true);
caps.setHardwareAccelerated(true);
GLCanvas canvas = new GLCanvas(caps);
add(canvas);
JoglEventListener jgl = new JoglEventListener();
canvas.addGLEventListener(jgl);
canvas.addKeyListener(jgl);
//anim = new Animator(canvas);
//anim.start();
}
/*************************************************************************************
* HelloOpenGL Constructor ?
**************************************************************************************/
public HelloOpenGL()
{
super("test");
setLayout(new BorderLayout());
// To close window
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
setSize(600, 600);
setLocation(40, 40);
setVisible(true);
// Call setupJOGL
setupJOGL();
}
public static void main(String[] args)
{
// Instantiate object
HelloOpenGL demo = new HelloOpenGL();
// Show it?
demo.setVisible(true);
}
}
class MyWin extends WindowAdapter
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
JoglEventListener.java
package helloOpenGL;
/*************************************************************************************
* IMPORTS
**************************************************************************************/
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import com.jogamp.opengl.*;
import com.jogamp.opengl.glu.GLU;
/*************************************************************************************
* JoglEventListener
**************************************************************************************/
public class JoglEventListener implements GLEventListener, KeyListener
{
float[] vertices={5.97994f, -0.085086f, -0.010798f,
5.97994f, 10.0043f, -0.010798f,
7.99077f, 10.0043f, -0.010798f,
7.99077f, 11.3449f, -0.010798f,
-0.405339f, 11.3449f, -0.010798f,
-0.405339f, 9.98083f, -0.010798f,
1.65252f, 9.98083f, -0.010798f,
1.65252f, 0.549879f, -0.010798f,
-0.722839f, 0.549879f, -0.010798f,
-0.722839f, -1.69612f, -0.010798f,
2.6168f, -1.69612f, -0.010798f,
-7.24925f, 0.42055f, -0.010798f,
-9.35415f, 0.42055f, -0.010798f,
-9.35415f, 10.0043f, -0.010798f,
-7.37859f, 10.0043f, -0.010798f,
-7.37859f, 11.3802f, -0.010798f,
-15.8217f, 11.3802f, -0.010798f,
-15.8217f, 9.99258f, -0.010798f,
-13.8109f, 9.99258f, -0.010798f,
-13.8109f, -0.061591f, -0.010798f,
-10.2361f, -1.73139f, -0.010798f,
-7.26099f, -1.73139f, -0.010798f,
-6.1909f, 0.855631f, -0.010798f,
-8.11942f, 0.855631f, -0.010798f,
-8.11942f, 2.31379f, -0.010798f,
0.217914f, 2.31379f, -0.010798f,
0.217914f, 0.926204f, -0.010798f,
-1.73415f, 0.926204f, -0.010798f,
-1.73415f, -4.10675f, -0.010798f,
9.23724f, 0.937952f, -0.010798f,
7.26169f, 0.937952f, -0.010798f,
7.26169f, 2.38434f, -0.010798f,
15.6696f, 2.38434f, -0.010798f,
15.6696f, 1.00851f, -0.010798f,
14.964f, 1.00851f, -0.010798f,
7.75558f, -2.44873f, -0.010798f,
14.4231f, -9.36318f, -0.010798f,
16.0576f, -9.36318f, -0.010798f,
16.0576f, -10.6685f, -0.010798f,
7.62625f, -10.6685f, -0.010798f,
7.62625f, -9.33965f, -0.010798f,
9.67236f, -9.33965f, -0.010798f,
4.49827f, -3.90687f, -0.010798f,
-1.35784f, -6.59973f, -0.010798f,
-1.35784f, -9.3279f, -0.010798f,
0.217914f, -9.3279f, -0.010798f,
0.217914f, -10.6919f, -0.010798f,
-8.22526f, -10.6919f, -0.010798f,
-8.22526f, -9.32786f, -0.010798f,
-6.20266f, -9.32786f, -0.010798f};
int[] indices={3, 2, 3, 1,
3, 1, 3, 6,
3, 1, 6, 10,
3, 10, 6, 7,
3, 10, 7, 8,
3, 4, 5, 6,
3, 4, 6, 3,
3, 10, 8, 9,
3, 1, 10, 0,
3, 13, 14, 15,
3, 13, 15, 18,
3, 13, 18, 20,
3, 13, 20, 12,
3, 16, 17, 18,
3, 16, 18, 15,
3, 12, 20, 21,
3, 12, 21, 11,
3, 20, 18, 19,
3, 49, 22, 44,
3, 44, 22, 28,
3, 44, 28, 43,
3, 43, 28, 29,
3, 43, 29, 42,
3, 42, 29, 35,
3, 42, 35, 41,
3, 41, 35, 36,
3, 41, 36, 38,
3, 38, 36, 37,
3, 39, 40, 41,
3, 39, 41, 38,
3, 29, 30, 32,
3, 29, 32, 34,
3, 29, 34, 35,
3, 46, 47, 49,
3, 46, 49, 44,
3, 46, 44, 45,
3, 22, 23, 25,
3, 22, 25, 27,
3, 22, 27, 28,
3, 25, 23, 24,
3, 27, 25, 26,
3, 49, 47, 48,
3, 32, 30, 31,
3, 34, 32, 33};
float backrgb[] = new float[4];
float rot;
// Instantiate GLU thing?
private GLU glu = new GLU();
/*************************************************************************************
* displayChanged
* What does this do?
**************************************************************************************/
public void displayChanged(GLAutoDrawable gLDrawable,
boolean modeChanged, boolean deviceChanged)
{
// Function that does nothing?
}
/** Called by the drawable immediately after the OpenGL context is
* initialized for the first time. Can be used to perform one-time OpenGL
* initialization such as setup of lights and display lists.
* @param gLDrawable The GLAutoDrawable object.
*/
/*************************************************************************************
* init
**************************************************************************************/
public void init(GLAutoDrawable gLDrawable)
{
GL2 gl = gLDrawable.getGL().getGL2();
//gl.glShadeModel(GL.GL_LINE_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
// Really Nice Perspective Calculations
//gl.glHint(GL.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_NICEST);
}
public void reshape(GLAutoDrawable gLDrawable, int x, int y, int width,
int height)
{
final GL2 gl = gLDrawable.getGL().getGL2();
if (height <= 0) // avoid a divide by zero error!
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, 200.0);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -40.0f);
}
@Override
public void display(GLAutoDrawable gLDrawable)
{
// TODO Auto-generated method stub
final GL2 gl = gLDrawable.getGL().getGL2();
gl.glClearColor(backrgb[0], 0, 1, 1);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
backrgb[0]+=0.0005;
if (backrgb[0]> 1) backrgb[0] = 0;
// DRAW STUFF IN THIS FUNCTION
}
@Override
public void dispose(GLAutoDrawable arg0)
{
// TODO Auto-generated method stub
}
@Override
public void keyTyped(KeyEvent e)
{
// TODO Auto-generated method stub
char key= e.getKeyChar();
System.out.printf("Key typed: %c\n", key);
}
@Override
public void keyPressed(KeyEvent e)
{
// TODO Auto-generated method stub
}
@Override
public void keyReleased(KeyEvent e)
{
// TODO Auto-generated method stub
}
/*
public void init(GLDrawable gLDrawable) {
final GL gl = glDrawable.getGL();
final GLU glu = glDrawable.getGLU();
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluOrtho2D(-1.0f, 1.0f, -1.0f, 1.0f); // drawing square
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}*/
}
当我按下键盘上的键时，基本上“键入的键”从不会被输出，这几乎就像是在听不到。我确定我的错误在某处是微不足道的，但我不知道它在哪里？
答案 0 :(得分：0)
您需要确保canvas具有焦点，以便在那里接收输入事件。我无法从GUI元素接收输入事件的代码量中分辨出来。也许将监听器添加到框架和显示的其他元素。或者将焦点明确地设置为canvas（并确保它保持在那里）。
当然，使用的方法称为JComponent.requestFocus（API）和needs to be called after the elements are displayed。
答案 1 :(得分：0)
key listener必须添加到Frame（画布）中。我会将HelloOpenGL类扩展为Frame，如下所示：
public class HelloOpenGL extends Frame implements KeyListener{
public HelloOpenGL(){
addKeyListener(this); //this statement is missing from your code
setFocusable(true);
...
}
...
//Override KeyListener interface methods in this class
}
所以我会在HelloOpenGL类本身进行键事件处理，因为它是表示Frame的那个，同时还要记住@Andy Turner所说的内容。我以这种方式尝试了一个程序，这在我的情况下工作得很好。