JOGL 入门程序

我们已经学会了如何在 JOGL 中绘制简单的线条。通过改变这样的线的坐标，我们也可以写出字母单词。

JOGL 入门程序 示例

在本例中，我们将绘制 Hello World（即 HW）的第一个字符。

package cn.xnip;

import javax.media.opengl.*;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.*;

public class HelloWorld implements GLEventListener {

    @Override
    public void init(GLAutoDrawable arg0) {

    }

    @Override
    public void display(GLAutoDrawable drawable) {
        final GL2 gl = drawable.getGL().getGL2();
        //Draw H
        gl.glBegin(GL2.GL_LINES);
        gl.glVertex2d(-0.8, 0.6);
        gl.glVertex2d(-0.8, -0.6);
        gl.glVertex2d(-0.8, 0.0);
        gl.glVertex2d(-0.4, 0.0);
        gl.glVertex2d(-0.4, 0.6);
        gl.glVertex2d(-0.4, -0.6);
        gl.glEnd();
//Draw W  
        gl.glBegin(GL2.GL_LINES);
        gl.glVertex2d(0.4, 0.6);
        gl.glVertex2d(0.4, -0.6);
        gl.glVertex2d(0.4, -0.6);
        gl.glVertex2d(0.6, 0);
        gl.glVertex2d(0.6, 0);
        gl.glVertex2d(0.8, -0.6);
        gl.glVertex2d(0.8, -0.6);
        gl.glVertex2d(0.8, 0.6);
        gl.glEnd();
    }

    @Override
    public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4) {

    }

    @Override
    public void dispose(GLAutoDrawable arg0) {

    }

    public static void main(String[] args) {

        final GLProfile gp = GLProfile.get(GLProfile.GL2);
        GLCapabilities cap = new GLCapabilities(gp);

        final GLCanvas gc = new GLCanvas(cap);
        HelloWorld sq = new HelloWorld();
        gc.addGLEventListener(sq);
        gc.setSize(400, 400);

        final JFrame frame = new JFrame("xnip.cn:Hello World");
        frame.add(gc);
        frame.setSize(500, 400);
        frame.setVisible(true);
    }
}    

输出结果如下：