JAVA的OPENGL，JOGL入门实例----不断变色的点阵 （源代码）

原文：http://blog.csdn.net/sidihuo/article/details/44035015

第一个类（代码解读）

package test1.opengl;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.HeadlessException;
import java.awt.Toolkit;

import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLCapabilities;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

import com.sun.opengl.util.Animator;
import com.sun.opengl.util.FPSAnimator;

public class SecondJoglApp extends JFrame {

    public static Animator animator = null;

    public GLCanvas canvas = null;

    public SecondJoglApp() throws HeadlessException {

        super("第二个JOGL");

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 初始化GLCapabilities

        final GLCapabilities glcaps = new GLCapabilities();

        canvas = new GLCanvas(glcaps); // 初试化GLcanvas,用法参照第一章

        canvas.addGLEventListener(new SecondGLEventListener()); // GLcanvas添加GLEventListener

        getContentPane().add(canvas, BorderLayout.CENTER); // 给窗体panel添加GLcanvas

        animator = new FPSAnimator(canvas, 10, true); // 本章重点，给canvas添加动画线程，每秒10帧

        setSize(500, 300);

        centerWindow(this);

    }

    public void centerWindow(final Component frame) { // 把窗体居中

        final Dimension screenSize =

        Toolkit.getDefaultToolkit().getScreenSize();

        final Dimension frameSize = frame.getSize();

        if (frameSize.width > screenSize.width) {
            frameSize.width = screenSize.width;
        }

        if (frameSize.height > screenSize.height) {
            frameSize.height = screenSize.height;
        }

        frame.setLocation(

        screenSize.width - frameSize.width >> 1,

        screenSize.height - frameSize.height >> 1

        );

    }

    public static void main(final String[] args) {

        // TODO Auto-generated method stub

        final SecondJoglApp app = new SecondJoglApp();

        // 显示窗体

        SwingUtilities.invokeLater(

        new Runnable() {

            @Override
            public void run() {

                app.setVisible(true);

            }

        }

        );

        SwingUtilities.invokeLater(

        new Runnable() {

            @Override
            public void run() {

                animator.start(); // 开始动画线程

            }

        }

        );

    }

}

第二个类

package test1.opengl;

import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.glu.GLU;

public class SecondGLEventListener implements GLEventListener {

    public SecondGLEventListener() {

        // TODO Auto-generated constructor stub

    }

    @Override
    public void display(final GLAutoDrawable arg0) { // 画图函数

        // TODO Auto-generated method stub

        float red = (float) (Math.random() * 1.0f); // 随机红

        float green = (float) (Math.random() * 1.0f); // 随机绿

        float blue = (float) (Math.random() * 1.0f); // 随机蓝

        final GL gl = arg0.getGL(); // 从GLAutoDrawable获取GL

        gl.glClear(GL.GL_COLOR_BUFFER_BIT); // 填充背景颜色

        gl.glPointSize(5.0f); // 设置点的大小

        for (int i = 0; i < 50; i++) { // 画点

            red -= .09f; // 红色值递减

            green -= .12f; // 绿色值递减

            blue -= .15f; // 蓝色值递减

            if (red < 0.15) {
                red = 1.0f;
            }

            if (green < 0.15) {
                green = 1.0f;
            }

            if (blue < 0.15) {
                blue = 1.0f;
            }

            gl.glColor3f(red, green, blue); // 设置GL的画图颜色，也就是画刷的颜色

            gl.glBegin(GL.GL_POINTS);

            gl.glVertex2i(i * 10, 150); // 画点由glBegin(GL.GL_POINTS)开始，glEnd()结束

            gl.glEnd();

        }

    }

    @Override
    public void displayChanged(final GLAutoDrawable arg0, final boolean arg1, final boolean arg2) {

        // TODO Auto-generated method stub

    }

    @Override
    public void init(final GLAutoDrawable gld) { // 初始函数

        // TODO Auto-generated method stub

        final GL gl = gld.getGL();

        final GLU glu = new GLU();

        gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // 设置背景颜色

        gl.glViewport(0, 0, 500, 300); // 视点大小

        gl.glMatrixMode(GL.GL_PROJECTION);

        gl.glLoadIdentity();

        glu.gluOrtho2D(0.0, 500.0, 0.0, 300.0); // 使坐标系统出现在GL里

    }

    @Override
    public void reshape(final GLAutoDrawable arg0, final int arg1, final int arg2, final int arg3,

    final int arg4) {

        // TODO Auto-generated method stub

    }

}