jogl入門之簡單的貪吃蛇
JOGL 是Java對于OpenGl的綁定（Java Bindings for OpenGL）.
package org.ligson.jogl.test;import java.awt.BorderLayout; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.util.ArrayList; import java.util.List; import java.util.Random;
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; import javax.swing.JFrame;
import org.ligson.jogl.test.SnakeDemo.Dir; /*
事物只有一個 */ public class SnakeDemo extends JFrame implements GLEventListener, Runnable,
KeyListener {//產生食物隨機坐標 Random random = new Random();
//枚舉方向 enum Dir {
UP(1), DOWN(2), LEFT(3), RIGHT(4); final int d; private Dir(int d) { this.d = d; } public int getDir() { return this.d; }}
//速度 float speed = 10.0f; //長度 int len = 5;
// gl庫的handler，相當于畫筆 GL gl; // 畫布 GLCanvas canvas; // 指定了一套OpenGL的功能：渲染內容必須支持，如色彩深度，以及立體是否已啟用。 GLCapabilities capabilities;
Thread thread = new Thread(this);
//蛇集合
List<Snake> snakes = new ArrayList<Snake>();
//食物集合
List<Food> foods = new ArrayList<Food>();
public SnakeDemo() {
super("Demo4");
this.setSize(500, 500);
//屏幕中心
this.setLocationRelativeTo(null);
this.setResizable(false);
capabilities = new GLCapabilities();
canvas = new GLCanvas(capabilities);
canvas.addGLEventListener(this);
this.addKeyListener(this);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
this.add(canvas, BorderLayout.CENTER);
thread.start();
}
@Override
public void run() {
while (true) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
canvas.display();
//檢查撞擊
checkHit();
}
}
@Override
public void display(GLAutoDrawable drawable) {
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glClear(GL.GL_DEPTH_BUFFER_BIT);
gl.glEnable(GL.GL_DEPTH_TEST);
gl.glColor3f(1.0f, 0.0f, 0.0f);
painSnakes();
painFoods();
gl.glFlush();
}
@Override
public void displayChanged(GLAutoDrawable drawable, boolean arg1,
boolean arg2) {
}
@Override
public void init(GLAutoDrawable drawable) {
gl = drawable.getGL();
gl.glClearColor(0.3f, 0.3f, 0.3f, 1.0f);
gl.glShadeModel(GL.GL_FLAT);
gl.glFrontFace(GL.GL_CW);
//初始化蛇
for (int i = 0; i < len; i++) {
Snake snake = new Snake(10.0f, 10.0f, 0.0f, i * 10.0f, Dir.UP);
snakes.add(snake);
}
//初始化食物
Food food = new Food(10.0f, 10.0f, random.nextInt(250),
random.nextInt(250));
foods.add(food);
}
@Override
public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h) {
if (h == 0) {
h = 1;
}
int windowWidth;
int windowHeight;
gl.glViewport(0, 0, w, h);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
if (w <= h) {
windowWidth = 250;
windowHeight = 250 * h / w;
} else {
windowWidth = 250 * w / h;
windowHeight = 250;
}
//重新定義世界坐標系，以窗口中心為（0,0,0）
gl.glOrtho(0 - windowWidth, windowWidth, 0 - windowHeight,
windowHeight, 250.0f, -250.0f);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}
public static void main(String[] args) {
SnakeDemo demo = new SnakeDemo();
demo.setVisible(true);
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
switch (key) {
case KeyEvent.VK_UP:
//防止向相反方向走
if (snakes.get(0).getDir() != Dir.DOWN) {
snakes.get(0).setDir(Dir.UP);
}
break;
case KeyEvent.VK_DOWN:
if (snakes.get(0).getDir() != Dir.UP) {
snakes.get(0).setDir(Dir.DOWN);
}
break;
case KeyEvent.VK_LEFT:
if (snakes.get(0).getDir() != Dir.RIGHT) {
snakes.get(0).setDir(Dir.LEFT);
}
break;
case KeyEvent.VK_RIGHT:
if (snakes.get(0).getDir() != Dir.LEFT) {
snakes.get(0).setDir(Dir.RIGHT);
}
break;
case KeyEvent.VK_EQUALS:
len++;
break;
case KeyEvent.VK_MINUS:
len--;
if (len < 1) {
len = 1;
}
break;
default:
break;
}
}
@Override
public void keyReleased(KeyEvent e) {
}
private void painSnakes() {
int abs = len - snakes.size();
if (abs > 0) {
for (int i = 0; i < abs; i++) {
Snake lastSnake = snakes.get(snakes.size() - 1);
Snake newSnake = new Snake(10.0f, 10.0f, lastSnake.getX() + 10,
lastSnake.getY() + 10, lastSnake.getDir());
snakes.add(newSnake);
}
} else if (abs < 0) {
for (int i = 0; i < -abs; i++) {
snakes.remove(snakes.size() - 1);
}
}
for (int i = snakes.size() - 1; i >= 1; i--) {
Snake tmpSnake = snakes.get(i);
Snake prevSnake = snakes.get(i - 1);
tmpSnake.setX(prevSnake.getX());
tmpSnake.setY(prevSnake.getY());
tmpSnake.setDir(prevSnake.getDir());
}
Snake snake = snakes.get(0);
int h = getContentPane().getHeight();
int w = getContentPane().getWidth();
switch (snake.getDir().getDir()) {
case 1:
if ((snake.getY() + speed - 10.0f) > (h / 2.0)) {
snake.setY(-250.0f);
} else {
snake.setY(snake.getY() + speed);
}
break;
case 2:
if ((snake.getY() + speed + snake.getHeight()) < -(h / 2.0)) {
snake.setY(250.0f);
} else {
snake.setY(snake.getY() - speed);
}
break;
case 3:
if ((snake.getX() + speed + snake.getWidth()) < -(w / 2.0)) {
snake.setX(250.0f);
} else {
snake.setX(snake.getX() - speed);
}
break;
case 4:
if ((snake.getX() + speed - 10.0f) > (w / 2.0)) {
snake.setX(-250.0f);
} else {
snake.setX(snake.getX() + speed);
}
break;
}
snakes.set(0, snake);
for (Snake snake2 : snakes) {
snake2.pain(gl);
}
}
private void painFoods() {
if (foods.size() == 0) {
Food food = new Food(10.0f, 10.0f, random.nextInt(250),
random.nextInt(250));
foods.add(food);
}
for (Food food : foods) {
food.pain(gl);
}
}
private void checkHit() {
for (Snake snake : snakes) {
for (Food food : foods) {
if (Math.abs(snake.getX() - food.getX()) < 10.0f
&& Math.abs(snake.getY() - food.getY()) < 10.0f) {
len++;
foods.remove(food);
break;
}
}
}
}
}
class Food { private float width = 10.0f; private float height = 10.0f; private float x = 0.0f; private float y = 0.0f;
public Food(float width, float height, float x, float y) {
super();
this.width = width;
this.height = height;
this.x = x;
this.y = y;
}
public float getWidth() {
return width;
}
public void setWidth(float width) {
this.width = width;
}
public float getHeight() {
return height;
}
public void setHeight(float height) {
this.height = height;
}
public float getX() {
return x;
}
public void setX(float x) {
this.x = x;
}
public float getY() {
return y;
}
public void setY(float y) {
this.y = y;
}
public void pain(GL gl) {
gl.glBegin(GL.GL_QUADS);
gl.glVertex3f(this.x, this.y, 0.0f);
gl.glVertex3f(this.x, this.y + height, 0.0f);
gl.glVertex3f(this.x + width, this.y + height, 0.0f);
gl.glVertex3f(this.x + width, this.y, 0.0f);
gl.glEnd();
}
}
class Snake { private float width = 10.0f; private float height = 10.0f; private float x = 0.0f; private float y = 0.0f; private Dir dir = Dir.UP;
private Random random = new Random();
public Snake(float width, float height, float x, float y, Dir dir) {
super();
this.width = width;
this.height = height;
this.x = x;
this.y = y;
this.dir = dir;
}
public float getWidth() {
return width;
}
public void setWidth(float width) {
this.width = width;
}
public float getHeight() {
return height;
}
public void setHeight(float height) {
this.height = height;
}
public float getX() {
return x;
}
public void setX(float x) {
this.x = x;
}
public float getY() {
return y;
}
public void setY(float y) {
this.y = y;
}
public Dir getDir() {
return dir;
}
public void setDir(Dir dir) {
this.dir = dir;
}
public float[] getPoints() {
return null;
}
public void pain(GL gl) {
gl.glColor3f(random.nextFloat(), random.nextFloat(), random.nextFloat());
gl.glBegin(GL.GL_QUADS);
gl.glVertex3f(this.x, this.y, 0.0f);
gl.glVertex3f(this.x, this.y + height, 0.0f);
gl.glVertex3f(this.x + width, this.y + height, 0.0f);
gl.glVertex3f(this.x + width, this.y, 0.0f);
gl.glEnd();
}
public String toString() {
return "X:" + this.x + ";Y:" + this.y;
}
}</pre>
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