📅  最后修改于: 2023-12-03 14:43:07.159000             🧑  作者: Mango
JOGL(Java OpenGL)是一个Java编程语言的代码库,它允许Java应用程序使用OpenGL API。JOGL提供了许多OpenGL特性,例如着色器和顶点缓冲对象。
要开始使用JOGL进行3D编程,您需要安装JOGL库并配置您的开发环境。以下是一些简单的步骤,让您开始进入3D编程的世界。
下载JOGL库。您可以从其官方网站下载JOGL库:https://jogamp.org/deployment/jogamp-current/archive/
导入库。在您的Java项目中安装JOGL库。您可以通过使用以下操作导入库:
file > project structure > libraries > add external jars
配置类路径。在您的Java项目中配置类路径,以便您的代码可以访问JOGL库。您可以通过使用以下操作配置类路径:
run > edit configurations > VM options > -Djava.library.path=path/to/jogl/library/
创建一个简单的3D场景,让我们首先从渲染三角形开始。以下是一个例子:
import com.jogamp.opengl.GL2;
import com.jogamp.opengl.GLAutoDrawable;
import com.jogamp.opengl.GLCapabilities;
import com.jogamp.opengl.GLEventListener;
import com.jogamp.opengl.awt.GLCanvas;
import javax.swing.*;
public class TriangleRenderer extends JFrame implements GLEventListener {
private GLCanvas glCanvas;
public TriangleRenderer() {
setTitle("Triangle Renderer");
setSize(800, 600);
setLocationRelativeTo(null);
GLCapabilities glCapabilities = new GLCapabilities(null);
glCanvas = new GLCanvas(glCapabilities);
glCanvas.addGLEventListener(this);
getContentPane().add(glCanvas);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) {
new TriangleRenderer();
}
@Override
public void init(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
}
@Override
public void display(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
gl.glClear(GL2.GL_COLOR_BUFFER_BIT);
gl.glBegin(GL2.GL_TRIANGLES);
gl.glColor3f(1.0f, 0.0f, 0.0f);
gl.glVertex3f(0.0f, 1.0f, 0.0f);
gl.glColor3f(0.0f, 1.0f, 0.0f);
gl.glVertex3f(-1.0f, -1.0f, 0.0f);
gl.glColor3f(0.0f, 0.0f, 1.0f);
gl.glVertex3f(1.0f, -1.0f, 0.0f);
gl.glEnd();
}
// Additional GLEventListener methods...
}
该示例创建了一个名为TriangleRenderer
的Java JFrame类。该类实现了JOGL的GLEventListener
接口,这意味着该类监听JOGL事件。该类渲染了一个三角形,使用了红色、绿色和蓝色的颜色。
您还可以旋转三角形。以下是一个例子:
import com.jogamp.opengl.*;
import com.jogamp.opengl.awt.*;
import javax.swing.*;
public class RotatingTriangle extends JFrame implements GLEventListener {
private GLCanvas canvas;
private float angle = 0.0f;
public RotatingTriangle() {
setTitle("Rotating Triangle");
setSize(800, 600);
setLocationRelativeTo(null);
GLCapabilities capabilities = new GLCapabilities(null);
canvas = new GLCanvas(capabilities);
getContentPane().add(canvas);
canvas.addGLEventListener(this);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) {
new RotatingTriangle();
}
public void display(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glRotatef(angle, 0.0f, 0.0f, 1.0f);
gl.glBegin(GL2.GL_TRIANGLES);
gl.glColor3f(1.0f, 0.0f, 0.0f);
gl.glVertex3f(0.0f, 1.0f, 0.0f);
gl.glColor3f(0.0f, 1.0f, 0.0f);
gl.glVertex3f(-1.0f, -1.0f, 0.0f);
gl.glColor3f(0.0f, 0.0f, 1.0f);
gl.glVertex3f(1.0f, -1.0f, 0.0f);
gl.glEnd();
angle += 0.5f;
}
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
GL2 gl = drawable.getGL().getGL2();
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
float aspect = (float) width / (float) height;
float fov = 45.0f;
float near = 0.1f;
float far = 100.0f;
float top = near * (float) Math.tan(Math.toRadians(fov / 2.0));
float bottom = -top;
float right = top * aspect;
float left = -right;
gl.glFrustum(left, right, bottom, top, near, far);
gl.glMatrixMode(GL2.GL_MODELVIEW);
}
public void dispose(GLAutoDrawable drawable) {
}
public void init(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
}
}
该示例创建了一个名为RotatingTriangle
的JFrame Java类。该类实现了JOGL的GLEventListener接口,并渲染了一个三角形。在GOpenGL的渲染循环中,三角形将沿着z轴旋转。
上述代码示例向您介绍了JOGL-3D基础知识。渲染一个简单的三角形,并将其旋转。您可以结合这些基础知识开发更加复杂的3D应用程序。