OpenGL的第二个实验：移动的方块

野性酷女 2022-12-24 12:56 132阅读 0赞

第一步：下载jogl-1.1.2-pre-20080523-windows-amd64包

第二步：打开eclipse导包和导入dll文件，导入的方法请见上一篇我的“OpenGL的第一个实验"文章。

第三步：代码如下：

package controller;

import java.awt.BorderLayout;  
import java.awt.Frame;  
import java.awt.HeadlessException;  
import java.awt.event.WindowAdapter;  
import java.awt.event.WindowEvent;  
import javax.media.opengl.GL;  
import javax.media.opengl.GLAutoDrawable;  
import javax.media.opengl.GLCanvas;  
import javax.media.opengl.GLCapabilities;  
import javax.media.opengl.GLEventListener;  
  
public class Opengl\_Bounce extends Frame implements GLEventListener, Runnable \{  
float x1 = 100.0f; //矩型的X坐标  
float y1 = 150.0f; //矩型的y坐标  
long rsize = 50; //为矩型宽度预留的位置或距离  
float xstep = 1.0f; //沿X每步位移的距离,当然可以改大些  
float ystep = 1.0f; //沿Y每步位移的距离  
float windowWidth; //这里不是指窗体边框的的宽，而是视觉投影的右端  
float windowHeight; //这里不是指窗体边框的的高，而是视觉投影的顶端  
GL gl; //OPENGL的主接口  
GLCanvas glcanvas; //类似java.awt.Canvas, GLCanvas主要用来显示各种OPENGL的效果  
GLCapabilities capabilities; //指定了一套OpenGL的功能：渲染内容必须支持，如色彩深度，以及立体是否已启用。  
Thread myThread = new Thread(this);  
public Opengl\_Bounce() throws HeadlessException \{  
this.capabilities = new GLCapabilities(); //实例化capabilities  
this.glcanvas = new GLCanvas(capabilities); //实例化glcanvas  
this.glcanvas.addGLEventListener(this); //给glcanvas添加GL事件处理  
this.add(glcanvas, BorderLayout.CENTER); //给窗体添加一个Component:glcanvas  
this.addWindowListener(new WindowAdapter() \{ //给窗体添加关闭事件  
public void windowClosing(WindowEvent e) \{  
System.exit(0);  
\}  
\});  
myThread.start(); //主线程开始  
\}  
  
public static void main(String\[\] args) \{  
Opengl\_Bounce f = new Opengl\_Bounce();  
f.setTitle("移动的矩型");  
f.setSize(800, 600);  
f.setVisible(true);  
\}  
  
public void display(GLAutoDrawable drawable) \{  
if (x1 > windowWidth - rsize || x1 < 0) \{  
xstep = -xstep;  
\}  
if (y1 > windowHeight - rsize || y1 < 0) \{  
ystep = -ystep;  
\}  
if (x1 > windowWidth - rsize) \{  
x1 = windowWidth - rsize;  
\}  
if (y1 > windowHeight - rsize) \{  
y1 = windowHeight - rsize;  
\}  
x1 += xstep;  
y1 += ystep;  
gl.glClear(GL.GL\_COLOR\_BUFFER\_BIT);  
gl.glColor3f(1.0f, 0.0f, 0.0f);  
gl.glRectf(x1, y1, x1 + rsize, y1 + rsize);  
gl.glFlush();  
glcanvas.swapBuffers();  
\}  
  
public void displayChanged(GLAutoDrawable drawable, boolean arg1,  
boolean arg2) \{  
\}  
  
public void init(GLAutoDrawable drawable) \{  
gl = drawable.getGL();  
gl.glClearColor(0.0f, 0.0f, 1.0f, 1.0f);  
\}  
  
public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h) \{  
if (h == 0) \{  
h = 1;  
\}  
gl.glViewport(0, 0, w, h);  
gl.glMatrixMode(GL.GL\_PROJECTION);  
gl.glLoadIdentity();  
if (w <= h) \{  
this.windowWidth = 250.0f;  
this.windowHeight = 250.0f \* h / w;  
\} else \{  
this.windowWidth = 250.0f \* w / h;  
this.windowHeight = 250.0f;  
\}  
gl.glOrtho(0.0f, windowWidth, 0.0f, windowHeight, 1.0f, -1.0f);  
gl.glMatrixMode(GL.GL\_MODELVIEW);  
gl.glLoadIdentity();  
\}  
  
public void run() \{  
while (true) \{  
glcanvas.display(); //主线程不停调用display()  
try \{  
myThread.sleep(20); //每执行完一次休息20毫秒  
\} catch (InterruptedException ex) \{  
ex.printStackTrace();  
\}  
\}  
\}  
\}

第四步：运行结果如下：它其实是一个红色的方块在窗体中运行。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnRpbmdibw_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppbnRpbmdibw_size_16_color_FFFFFF_t_70]: /images/20221120/2c05c74e0b2143de80dc671c58860177.png