我一直在考虑这个问题，我想不出我能在游戏中让角色跳跃。这是一款基于状态的平台游戏，采用slick2d+LWJGL。
这是我的代码
package net.battle.main;
import java.io.Console;
import java.util.Arrays;
import org.lwjgl.input.Keyboard;
import org.newdawn.slick.Animation;
import org.newdawn.slick.Color;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Image;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.state.GameState;
import org.newdawn.slick.state.StateBasedGame;
public class Level implements GameState {
private static final float shfitX = 0;
Animation ninja, fairy, ninja_left, fairy_left, ninja_right, fairy_right;
Image WorldMap;
boolean pause = false;
int[] duration = {200, 200, 200};
float charPosX= 0;
float charPosY= 0;
float shiftX= charPosX + 360;
float shiftY= charPosY + 160;
public Level(int level) {
}
@Override
public void mouseClicked(int arg0, int arg1, int arg2, int arg3) {
}
@Override
public void mouseDragged(int arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void mouseMoved(int arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(int arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(int arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void mouseWheelMoved(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void inputEnded() {
// TODO Auto-generated method stub
}
@Override
public void inputStarted() {
// TODO Auto-generated method stub
}
@Override
public boolean isAcceptingInput() {
// TODO Auto-generated method stub
return false;
}
@Override
public void setInput(Input arg0) {
// TODO Auto-generated method stub
}
@Override
public void keyPressed(int arg0, char arg1) {
// TODO Auto-generated method stub
}
@Override
public void keyReleased(int arg0, char arg1) {
// TODO Auto-generated method stub
}
@Override
public void controllerButtonPressed(int arg0, int arg1) {
// TODO Auto-generated method stub
}
@Override
public void controllerButtonReleased(int arg0, int arg1) {
// TODO Auto-generated method stub
}
@Override
public void controllerDownPressed(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void controllerDownReleased(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void controllerLeftPressed(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void controllerLeftReleased(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void controllerRightPressed(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void controllerRightReleased(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void controllerUpPressed(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void controllerUpReleased(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void enter(GameContainer arg0, StateBasedGame arg1)
throws SlickException {
// TODO Auto-generated method stub
}
@Override
public int getID() {
// TODO Auto-generated method stub
return 1;
}
@Override
public void init(GameContainer arg0, StateBasedGame arg1)
throws SlickException {
WorldMap = new Image("res/testmap.png");
Image[] ninjaRight = {new Image("res/ninja-right.png"),new Image("res/ninja-right-walking.png"), new Image("res/ninja-right-walking-two.png")};
Image[] ninjaLeft = {new Image("res/ninja-left.png"),new Image("res/ninja-left.png"), new Image("res/ninja-left.png")};
Image[] ninjaStanding = {new Image("res/ninja.png"),new Image("res/ninja.png"), new Image("res/ninja.png")};
Image[] fairyRight = {new Image("res/fairy-right.png"),new Image("res/fairy-right-walking.png"), new Image("res/fairy-right-walking-two.png")};
Image[] fairyLeft = {new Image("res/fairy-left.png"), new Image("res/fairy-left-walking.png"), new Image("res/fairy-left-walking-two.png")};
Image[] fairyStanding = {new Image("res/fairy.png"),new Image("res/fairy.png"), new Image("res/fairy.png")};
ninja_right = new Animation(ninjaRight, duration, true);
ninja_left = new Animation(ninjaLeft, duration, true);
ninja = new Animation(ninjaStanding, duration, false);
fairy_right = new Animation(fairyRight, duration, true);
fairy_left = new Animation(fairyLeft, duration, true);
fairy = new Animation(fairyStanding, duration, false);
}
@Override
public void leave(GameContainer arg0, StateBasedGame arg1)
throws SlickException {
// TODO Auto-generated method stub
}
@Override
public void render(GameContainer gc, StateBasedGame s, Graphics g)throws SlickException {
WorldMap.draw(charPosX,charPosY);
fairy.draw(shiftX,shiftY);
g.drawString("char X: "+charPosX+"nchar Y: "+charPosY, 400, 20);
if(pause==true){
g.setColor(Color.black);
g.fillRect(240, 100, 200, 100);
g.setColor(Color.white);
g.drawString("Resume (Press esc)", 250, 110);
g.drawString("Main Menu (Press M)", 250, 130);
g.drawString("Quit (Press Q)", 250, 150);
if(pause==false){
g.clear();
}
}
}
@Override
public void update(GameContainer gc, StateBasedGame s, int delta)
throws SlickException {
boolean n;
Input input = gc.getInput();
//System.out.println(pause);
// PAUSE MENU
if(pause==true){
if(Keyboard.isKeyDown(input.KEY_M)){
System.out.println("Key Press: M has been pressed");
System.out.println(pause);
s.enterState(0);
}
if(Keyboard.isKeyDown(input.KEY_Q)){
System.out.println("Key Press: Q has been pressed nExiting game");
System.exit(0);
}
}
if(input.isKeyPressed(input.KEY_ESCAPE)){
System.out.println("Key Press: Escape has been pressed");
if(pause==true){
System.out.println(pause);
System.out.println("boolean change");
pause=false;
System.out.println(pause);
gc.setPaused(false);
System.out.println("unpaused");
}else if(pause==false){
System.out.println(pause);
System.out.println("boolean change");
pause=true;
System.out.println(pause);
gc.setPaused(true);
System.out.println("paused");
}
}
// END OF PAUSE MENU
// CHARACTER MOVEMENT
if(Keyboard.isKeyDown(input.KEY_SPACE)){
fairy=fairy;
}
if(Keyboard.isKeyDown(input.KEY_D)){
fairy = fairy_right;
charPosX -= delta *.1;
if(charPosX<-1607){
charPosX += delta *.1;
}
}
if(input.isKeyDown(input.KEY_A)){
fairy = fairy_left;
charPosX += delta *.1;
if(charPosX>361){
charPosX -= delta *.1;
}
}
}
}
所以，如果有人能想出一种方法让我的角色能够跳跃，那将是太棒了！
好吧，这很容易解决。起初，我会创建一个Vector2f（我认为它无论如何都是这样命名的），并将其称为玩家速度。
if(Keyboard.isKeyDown(input.KEY_SPACE)){
fairy=fairy;
velocity.y = 1; //play around with that number to influence gravity
}
updatePlayer();
然后是updatePlayer（）方法：
protected void updatePlayer() {
if(velocity.y > 0) {
charPosY = charPosY + (delta * velocity.y);
velocity.y = velocity.y - (0.1 * delta);
}
这些只是代码片段，不起作用。我写它们是为了给你和它应该是什么样子的想法