JOGL 2D对象

17 Mar 2025 | 阅读 2 分钟

在上一节中，我们已经学习了如何在 JOGL 中绘制一条基本线。使用相同的方法，我们还可以绘制各种类型的形状，例如正方形、矩形、三角形等。

JOGL 正方形示例

在此示例中，我们将绘制四个不同的边，使它们都连接在正方形形状的点上。

package com.javatpoint.jogl;
import javax.media.opengl.*;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;

public class Square implements GLEventListener {

	@Override
public void init(GLAutoDrawable arg0) 
  {
		
  }

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

      //Drawing top edge
gl.glBegin( GL2.GL_LINES );
gl.glVertex2d(-0.4, 0.4);
gl.glVertex2d(0.4, 0.4);
gl.glEnd();

//Drawing bottom edge
gl.glBegin( GL2.GL_LINES );
gl.glVertex2d(-0.4,-0.4);
gl.glVertex2d(0.4, -0.4);
gl.glEnd();

      //Drawing right edge
gl.glBegin( GL2.GL_LINES );
gl.glVertex2d(-0.4, 0.4);
gl.glVertex2d(-0.4, -0.4);
gl.glEnd();

      //Drawing left edge
gl.glBegin( GL2.GL_LINES );
gl.glVertex2d(0.4, 0.4);
gl.glVertex2d(0.4, -0.4);
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);
      Square sq = new Square();
gc.addGLEventListener(sq);
gc.setSize(400, 400);

final JFrame frame = new JFrame("JOGL Line");
frame.add(gc);
frame.setSize(500,400);
frame.setVisible(true);  
   }	
}

输出

JOGL 三角形示例

在此示例中，我们将绘制三个不同的边，使它们都连接在三角形形状的点上。

Triangle.java

package com.javatpoint.jogl;
import javax.media.opengl.*;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;

public class Triangle implements GLEventListener {

	@Override
public void init(GLAutoDrawable arg0) 
  {
		
  }

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

      // Base edge
gl.glBegin (GL2.GL_LINES);
gl.glVertex2d(-0.65, -0.65);
gl.glVertex2d(0.65, -0.65);
gl.glEnd();

      //Right edge
gl.glBegin (GL2.GL_LINES);
gl.glVertex2d(0, 0.65);
gl.glVertex2d(-0.65, -0.65);
gl.glEnd();

      //Left edge
gl.glBegin (GL2.GL_LINES);
gl.glVertex2d(0, 0.65);
gl.glVertex2d(0.65, -0.65);
gl.glEnd();
gl.glFlush();
   }      
   @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);
      Triangle tr= new Triangle();
gc.addGLEventListener(tr);
gc.setSize(400, 400);

final JFrame frame = new JFrame("JOGL Triangle");
frame.add(gc);
frame.setSize(500,400);
frame.setVisible(true);  
   }	
}

输出