java完整2D游戏连载--part1（所有代码均为自主完成） - 黑马程序员技术交流社区

package project2;
/* 433-294 Object Oriented Software Development //我的课的名字
* RPG Game Engine
* Author: weiqian wang <wangw> //我的名字及学校用户名。
*/
//import 基本
import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;
/** Main class for the Role-Playing Game engine.
* Handles initialisation, input and rendering.
*/
public class RPG extends BasicGame
{
/** Location of the "assets" directory. */
public static final String ASSETS_PATH = "assets";
/** Screen width, in pixels. */
public static final int screenwidth = 800;
/** Screen height, in pixels. */
public static final int screenheight = 600;
public static final int panelheight = 60;
private __world world;
/** Create a new RPG object. */
public RPG()
{
super("RPG Game Engine");
}
/** Initialise the game state. 初始化游戏状态，初始游戏容器
* @param gc The Slick game container object.
*/
@Override
public void init(GameContainer gc)
throws SlickException
{
world = new __world();
}
/** Update the game state for a frame. 不断更新游戏数据，游戏程序非一般程序，数据画面需随时更新渲染。
* @param gc The Slick game container object.
* @param delta Time passed since last frame (milliseconds).
*/
@Override
public void update(GameContainer gc, int delta)
throws SlickException
{
// Get data about the current input (keyboard state). 键盘输入状态
Input input = gc.getInput();
// Update the player's movement direction based on keyboard presses.
double dir_x = 0;
double dir_y = 0;
if (input.isKeyDown(Input.KEY_DOWN))
dir_y += 1;
if (input.isKeyDown(Input.KEY_UP))
dir_y -= 1;
if (input.isKeyDown(Input.KEY_LEFT))
dir_x -= 1;
if (input.isKeyDown(Input.KEY_RIGHT))
dir_x += 1;
// Let World.update decide what to do with this data.玩家位置，镜头系统固定。
world.update(dir_x, dir_y, delta);
}
/** Render the entire screen, so it reflects the current game state.渲染画面，更新游戏画面。
* @param gc The Slick game container object.
* @param g The Slick graphics object, used for drawing.
*/
public void render(GameContainer gc, Graphics g)
throws SlickException
{
// Let World.render handle the rendering.
world.render(g);
}
/** Start-up method. Creates the game and runs it. main函数，开启游戏。
* @param args Command-line arguments (ignored).
*/
public static void main(String[] args)
throws SlickException
{
AppGameContainer app = new AppGameContainer(new RPG());
// setShowFPS(true), to show frames-per-second.
app.setShowFPS(false);
app.setDisplayMode(screenwidth, screenheight, false);
app.start();
}
}

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