JOGL 3D三角形

在本节中，我们将通过简单的示例学习如何创建一个三维三角形。我们还将旋转这个三角形以查看它的所有边。

package cn.xnip;

import com.jogamp.opengl.util.FPSAnimator;

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

public class J3DTriangle implements GLEventListener {

    private GLU glu = new GLU();
    private float rotation = 0.0f;

    @Override
    public void display(GLAutoDrawable drawable) {
        final GL2 gl = drawable.getGL().getGL2();


        gl.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);
        gl.glLoadIdentity();
        // Move triangle  
        gl.glTranslatef(-0.5f, 0.0f, -6.0f);
        gl.glRotatef(rotation, 0.0f, 1.0f, 0.0f);
        gl.glBegin(GL2.GL_TRIANGLES);


        // Front  
        gl.glColor3f(1.0f, 1.0f, 0.0f); // Yellow  
        gl.glVertex3f(1.5f, 2f, 0.0f); // Top Of Triangle   

        gl.glColor3f(0.0f, 1.5f, 0.0f); // Green  
        gl.glVertex3f(-1.5f, -1.5f, 1.5f); // Left Of Triangle   

        gl.glColor3f(1.0f, 0.0f, 1.0f); // Purple  
        gl.glVertex3f(1.5f, -1.5f, 1.5f); // Right Of Triangle   

        // Right  
        gl.glColor3f(1.0f, 1.0f, 0.0f); // Yellow  
        gl.glVertex3f(1.5f, 2.0f, 0.0f); // Top Of Triangle   

        gl.glColor3f(1.0f, 0.0f, 1.0f); // Purple  
        gl.glVertex3f(1.5f, -1.5f, 1.5f); // Left Of Triangle   

        gl.glColor3f(0.0f, 1.0f, 0.0f); // Green  
        gl.glVertex3f(1.5f, -1.5f, -1.5f); // Right Of Triangle   

        // Back  
        gl.glColor3f(1.0f, 1.0f, 0.0f); // Yellow  
        gl.glVertex3f(1.5f, 2.0f, 0.0f); // Top Of Triangle   

        gl.glColor3f(0.0f, 1.0f, 0.0f); // Green  
        gl.glVertex3f(1.5f, -1.5f, -1.5f); // Left Of Triangle   

        gl.glColor3f(1.0f, 0.0f, 1.0f); // Purple  
        gl.glVertex3f(-1.5f, -1.5f, -1.5f); // Right Of Triangle   

        //left  
        gl.glColor3f(1.0f, 1.0f, 0.0f); // Yellow  
        gl.glVertex3f(1.5f, 2.0f, 0.0f); // Top Of Triangle   

        gl.glColor3f(1.0f, 0.0f, 1.0f); // Purple  
        gl.glVertex3f(-1.5f, -1.5f, -1.5f); // Left Of Triangle   

        gl.glColor3f(0.0f, 1.0f, 0.0f); // Green  
        gl.glVertex3f(-1.5f, -1.5f, 1.5f); // Right Of Triangle   

        gl.glEnd();
        gl.glFlush();
        rotation += 0.6f;
    }

    @Override
    public void dispose(GLAutoDrawable drawable) {
        //method body  
    }

    @Override
    public void init(GLAutoDrawable drawable) {
        //method body  
    }

    @Override
    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {

        final GL2 gl = drawable.getGL().getGL2();
        if (height <= 0)
            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, 20.0);
        gl.glMatrixMode(GL2.GL_MODELVIEW);
        gl.glLoadIdentity();
    }

    public static void main(String[] args) {

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

        final GLCanvas gc = new GLCanvas(cap);
        J3DTriangle triangle = new J3DTriangle();

        gc.addGLEventListener(triangle);
        gc.setSize(400, 400);

        final JFrame frame = new JFrame("xnip.cn:3D Triangle");

        frame.add(gc);
        frame.setSize(500, 400);
        frame.setVisible(true);


        final FPSAnimator animator = new FPSAnimator(gc, 400, true);
        animator.start();
    }

}  

输出结果为：