我尝试将我的 LWJGL 游戏转换为小程序，但它无法加载图像，当我删除图像的代码时，它会引发空指针异常，所以有人可以给我一个关于如何将此代码转换为小程序的演练：
package com.kgt.platform.name;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import kuusisto.tinysound.Sound;
import kuusisto.tinysound.Music;
import kuusisto.tinysound.TinySound;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.newdawn.slick.Color;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;
import static org.lwjgl.opengl.GL11.*;
public class Game {
public static Player player;
public static Enemy enemy;
public static ExitButton exitbutton;
public static MenuButton menubutton;
public static ArrayList<Coin> coinlist;
public static ArrayList<Bullet> bulletlist;
public static ArrayList<Bullet2> bulletlist2;
public static ArrayList<Platform> platformlist;
public static ArrayList<OneWayPlatform> onewayplatformlist;
public static int score;
public static boolean p1on;
public static boolean p2on;
static State state = State.GAME;
public int curlvl = 1;
private static Texture logo;
private static Texture pause;
public enum State {
PAUSE, GAME, MAIN_MENU, INTRO;
}
public static void init() {
try {
// load texture from PNG file
logo = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("res/logo.png"));
System.out.println("Texture 'logo' Loaded. Format: PNG");
pause = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("res/paused.png"));
System.out.println("Texture 'pause' Loaded. Format: PNG");
} catch (IOException e) {
e.printStackTrace();
}
}
public static void logo() {
Color.white.bind();
logo.bind(); // or GL11.glBind(texture.getTextureID());
GL11.glBegin(GL11.GL_QUADS);
GL11.glTexCoord2f(0,0);
GL11.glVertex2f(192,468);
GL11.glTexCoord2f(1,0);
GL11.glVertex2f(192+logo.getTextureWidth(),468);
GL11.glTexCoord2f(1,1);
GL11.glVertex2f(192+logo.getTextureWidth(),468- logo.getTextureHeight());
GL11.glTexCoord2f(0,1);
GL11.glVertex2f(192,468-logo.getTextureHeight());
GL11.glEnd();
}
public static void pause() {
Color.white.bind();
pause.bind(); // or GL11.glBind(texture.getTextureID());
GL11.glBegin(GL11.GL_QUADS);
GL11.glTexCoord2f(0,0);
GL11.glVertex2f(256,440);
GL11.glTexCoord2f(1,0);
GL11.glVertex2f(256+pause.getTextureWidth(),440);
GL11.glTexCoord2f(1,1);
GL11.glVertex2f(256+pause.getTextureWidth(),440- pause.getTextureHeight());
GL11.glTexCoord2f(0,1);
GL11.glVertex2f(256,440-pause.getTextureHeight());
GL11.glEnd();
}
public static void main(String[] args) throws Exception
{
System.setProperty("org.lwjgl.librarypath", new File("natives").getAbsolutePath());
System.out.println("Native Path: " + System.getProperty("org.lwjgl.librarypath"));
Display.setDisplayMode(new DisplayMode(640, 480));
Display.create();
init();
score = 0;
player = new Player();
exitbutton = new ExitButton(320, 61);
menubutton = new MenuButton(320, 95);
enemy = new Enemy();
coinlist = new ArrayList<Coin>(0);
bulletlist = new ArrayList<Bullet>(0);
bulletlist2 = new ArrayList<Bullet2>(0);
platformlist = new ArrayList<Platform>(0);
onewayplatformlist = new ArrayList<OneWayPlatform>(0);
Level1();
while(!Display.isCloseRequested())
{
setCamera();
drawBackground1();
for(Coin c: coinlist) c.draw();
for(Bullet b: bulletlist) b.draw();
for(Bullet2 b: bulletlist2) b.draw();
for(Platform b: platformlist) b.draw();
for(OneWayPlatform b: onewayplatformlist) b.draw();
enemy.draw();
player.draw();
states();
stateinput();
exitbutton.draw();
menubutton.draw();
Display.update();
Display.sync(60);
}
Display.destroy();
}
public static void stopsound(){
TinySound.shutdown();
}
public static void states(){
switch (state) {
case INTRO:
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
glColor3f(1.0f, 0.0f, 0.0f);
glRectf(0, 0, 640, 480);
break;
case GAME:
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
break;
case MAIN_MENU:
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
glColor3f(0.0f, 0.0f, 1.0f);
glRectf(0, 0, 640, 480);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, logo.getTextureID());
logo();
break;
case PAUSE:
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
glEnable(GL_COLOR_ARRAY);
glBegin(GL_QUADS);
glColor4d(0.5f, 0.5f, 0.5, 0.7);
glVertex2d(224, 40);
glVertex2d(416, 40);
glColor4d(0.7f, 0.7f, 0.7, 0.7);
glVertex2d(416, 440);
glVertex2d(224, 440);
glEnd();
glDisable(GL_COLOR_ARRAY);
glColor3f(0f, 0f, 0f);
glRectf(224, 40, 226, 440);
glRectf(416, 40, 414, 440);
glRectf(224, 40, 416, 42);
glRectf(224, 438, 416, 440);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, pause.getTextureID());
pause();
break;
}
}
public static void stateinput(){
while (Keyboard.next()) {
if(Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) {
if(state == State.GAME)
state = State.PAUSE;
else if(state == State.PAUSE)
state = State.GAME;
}
}
}
public static void jumpsound(){
TinySound.init();
Sound jump = TinySound.loadSound("/sound/Jump6.wav");
jump.play();
}
public static void shootsound(){
TinySound.init();
Sound shoot = TinySound.loadSound("/sound/Shoot1.wav");
shoot.play();
}
public static void selectsound(){
TinySound.init();
Sound select = TinySound.loadSound("/sound/select.wav");
select.play();
}
public static void hurtsound(){
TinySound.init();
Sound hurt = TinySound.loadSound("/sound/Hurt1.wav");
hurt.play();
}
public static void music(int track){
TinySound.init();
Music ocean = TinySound.loadMusic("/music/ocean.wav");
Music menu1 = TinySound.loadMusic("/music/menu1.wav");
if(track == 1){
ocean.play(true);
}
else if (track == 0){
menu1.play(true);
}
}
public static void setCamera(){
GL11.glEnable(GL11.GL_TEXTURE_2D);
GL11.glEnable(GL_COLOR_ARRAY);
GL11.glShadeModel(GL11.GL_SMOOTH);
GL11.glDisable(GL11.GL_DEPTH_TEST);
GL11.glDisable(GL11.GL_LIGHTING);
GL11.glEnable( GL11.GL_TEXTURE );
GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
GL11.glClearDepth(1);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glViewport(0,0,640,480);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glMatrixMode(GL11.GL_PROJECTION);
GL11.glLoadIdentity();
GL11.glOrtho(0, 640, 0, 480, 1, -1);
GL11.glMatrixMode(GL11.GL_MODELVIEW);
}
public static void Level1(){
Game.platformlist.add(new Platform(16, 120));
Game.platformlist.add(new Platform(48, 120));
Game.platformlist.add(new Platform(624, 120));
Game.platformlist.add(new Platform(592, 120));
Game.onewayplatformlist.add(new OneWayPlatform(128, 200));
Game.onewayplatformlist.add(new OneWayPlatform(160, 200));
music(1);
}
public static void drawBackground1(){
GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
glBegin(GL_QUADS);
glColor3d(0.4, 0.5, 0.7);
glVertex2d(640, 480);
glVertex2d(0, 480);
glColor3d(0.7, 0.8, 0.9);
glVertex2d(0, 0);
glVertex2d(640, 0);
glEnd();
glBegin(GL_QUADS);
glColor3d(0.3, 0.2, 0.1);
glVertex2d(0, 0);
glVertex2d(640, 0);
glColor3d(0.5, 0.2, 0.1);
glVertex2d(640, 32);
glVertex2d(0, 32);
glEnd();
glBegin(GL_QUADS);
glColor3d(0.5, 0.2, 0.1);
glVertex2d(0, 32);
glVertex2d(640, 32);
glColor3d(0.2, 0.5, 0.1);
glVertex2d(640, 47);
glVertex2d(0, 47);
glColor3d(1, 1, 1);
glEnd();
}
}