Java & Slick 遊戲開發19-Collision Detection

package javagame;

import org.newdawn.slick.*;

import org.newdawn.slick.state.*;

public class Play extends BasicGameState{

Animation mychar, movingUp, movingDown, movingLeft, movingRight;

Image worldMap;

boolean quit = false;

int[] duration = {200,200};

float mycharPositionX = 0;

float mycharPositionY = 0;

float shiftX = mycharPositionX + 320;

float shiftY = mycharPositionY + 160;

public Play(int state){

}

public void init(GameContainer gc, StateBasedGame sbg) throws SlickException{

worldMap = new Image("res/world.png");

Image[] walkUp = {new Image("res/buckysBack.png"), new Image("res/buckysBack.png")};

Image[] walkDown = {new Image("res/buckysFront.png"), new Image("res/buckysFront.png")};

Image[] walkLeft = {new Image("res/buckysLeft.png"), new Image("res/buckysLeft.png")};

Image[] walkRight = {new Image("res/buckysRight.png"), new Image("res/buckysRight.png")};

movingUp = new Animation(walkUp, duration, false);

movingDown = new Animation(walkDown, duration, false);

movingLeft = new Animation(walkLeft, duration, false);

movingRight = new Animation(walkRight, duration, false);

mychar = movingDown;

}

public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException{

worldMap.draw(mycharPositionX,mycharPositionY);

mychar.draw(shiftX,shiftY);

g.drawString(" X: "+mycharPositionX+"\n Y: "+mycharPositionY, 400, 20);

if(quit==true){

g.drawString("Resume (R)", 250, 100);

g.drawString("Main Menu (M)", 250, 150);

g.drawString("Quit Game (Q)", 250, 200);

if(quit==false){

g.clear();

}

}

}

public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException{

Input input = gc.getInput();

if(input.isKeyDown(Input.KEY_UP)){

mychar = movingUp;

mycharPositionY += delta * .1f;

if(mycharPositionY>162){ → 設置限制，當主角向上移動超過背景時不能移動

mycharPositionY -= delta * .1f;

}

}

if(input.isKeyDown(Input.KEY_DOWN)){

mychar = movingDown;

mycharPositionY -= delta * .1f;

if(mycharPositionY<-600){ → 設置限制，當主角向下移動超過背景時不能移動

mycharPositionY += delta * .1f;

}

}

if(input.isKeyDown(Input.KEY_LEFT)){

mychar = movingLeft;

mycharPositionX += delta * .1f;

if(mycharPositionX>324){ → 設置限制，當主角移動向左超過背景時不能移動

mycharPositionX -= delta * .1f;

}

}

if(input.isKeyDown(Input.KEY_RIGHT)){

mychar = movingRight;

mycharPositionX -= delta * .1f;

if(mycharPositionX<-840){ → 設置限制，當主角移動向右超過背景時不能移動

mycharPositionX += delta * .1f;

}

}

}

public int getID(){

return 1;

}

}