由于这似乎是关于“堆栈”的一个反复出现的主题，我将强化我的问题，因为没有涵盖的东西。所涉及的是用于平台游戏等的2D平铺碰撞，但是通过我制作游戏的方式，没有平铺。我也没有使用额外的库，一切都是我自己写的。
我所拥有的是为游戏中的每个对象绑定Rect。到目前为止，只有两个对象类正在使用，即Platform和Entity。实体包含玩家移动等所有内容，而平台则适用于坚固的非移动平台。
Platform.java：
package com.toongames.game.objects;
import android.graphics.Color;
import android.graphics.Rect;
import com.toongames.framework.Graphics;
public class Platform {
private int x, y;
private int width, height;
public Platform(int par1, int par2, int par3, int par4) {
x = par1;
y = par2;
width = par3;
height = par4;
}
public Rect getBounds() {
return new Rect(x, y, x + width, y + height);
}
}
Entity.java：
package com.toongames.game.entity;
import android.graphics.Color;
import android.graphics.Point;
import android.graphics.Rect;
import com.toongames.framework.Graphics;
import com.toongames.framework.Image;
public class Entity {
public final float GRAVITY = 0.1F;
private String entityID;
private Point pos;
private int dx;
private float vel;
public Point desiredPos;
public boolean onGround;
public Entity(String par0String, int par1, int par2) {
entityID = par0String;
pos = new Point(par1, par2);
desiredPos = pos;
dx = 0;
vel = 0;
}
public void update(float deltaTime) {
vel = vel + (GRAVITY * deltaTime);
pos.y += (vel * deltaTime);
pos.x += dx;
}
public void setDx(int par1) {
dx = par1;
}
public int getDx() {
return dx;
}
public void setVelocity(int par1) {
vel = par1;
}
public float getVelocity() {
return vel;
}
public void setPos() {
pos = desiredPos;
}
public Rect getBounds() {
return new Rect(desiredPos.x, desiredPos.y, desiredPos.x + 80, desiredPos.y + 80);
}
}
我已成功让玩家上下碰撞，但我不能为我的生活设法让玩家左右碰撞。每当我向左或向右移动时与平台碰撞，我只是跳到我碰撞的平台顶部。
我知道它与我的逻辑有关，但我无法弄清楚使用的正确逻辑。
ScreenGame.java：
package com.toongames.game.screen;
// Imports here...
public class ScreenGame extends Screen {
private Entity player;
private Button left, right, jump;
private Platform floor, p, p2, p3;
private ArrayList<Platform> platforms;
public ScreenGame(Game game) {
super(game);
player = new Entity("PLAYER", 300, 100, Assets.charRight);
left = new Button(Assets.move_left, 10, 790 - Assets.move_left.getHeight(), Assets.move_left.getWidth(), Assets.move_left.getHeight());
right = new Button(Assets.move_right, 20 + Assets.move_left.getWidth(), 790 - Assets.move_right.getHeight(), Assets.move_right.getWidth(), Assets.move_right.getHeight());
jump = new Button(Assets.jump, 1270 - Assets.jump.getWidth(), 790 - Assets.jump.getHeight(), Assets.jump.getWidth(), Assets.jump.getHeight());
floor = new Platform(0, 790, 1280, 80);
p = new Platform(1280 - 500, 500, 400, 80);
p2 = new Platform(0, 200, 400, 80);
p3 = new Platform(400, 120, 200, 80);
platforms = new ArrayList<Platform>();
platforms.add(floor);
platforms.add(p);
platforms.add(p2);
platforms.add(p3);
}
// An update method calls these
public void updateMovement(float deltaTime) {
List<TouchEvent> touchEvents = game.getInput().getTouchEvents();
int len = touchEvents.size();
for (int i = 0; i < len; i++) {
TouchEvent event = touchEvents.get(i);
if (event.type == TouchEvent.TOUCH_DOWN) {
if (inBounds(left.getBounds(), event)) {
player.setDx((int) -(deltaTime * 1.5F));
} else if (inBounds(right.getBounds(), event)) {
player.setDx((int) deltaTime * 2);
} else if (inBounds(jump.getBounds(), event)) {
if (player.onGround) {
player.setVelocity(-8);
}
}
} else if (event.type == TouchEvent.TOUCH_DRAGGED) {
if (inBounds(left.getBounds(), event)) {
player.setDx((int) -deltaTime * 2);
} else if (inBounds(right.getBounds(), event)) {
player.setDx((int) deltaTime * 2);
} else if (inBounds(jump.getBounds(), event)) {
if (player.onGround) {
player.setVelocity(-8);
}
} else {
player.setDx(0);
player.jumpCounter = 0;
}
} else if (event.type == TouchEvent.TOUCH_UP) {
player.setDx(0);
player.jumpCounter = 0;
}
}
}
// An update method calls these
public void updateGameObjects(float deltaTime) {
for (Platform p : platforms)
p.update();
player.update(deltaTime);
}
// An update method calls these
public void checkCollisions() {
Rect playerRect = player.getBounds();
for (Platform p : platforms) {
Rect pRect = p.getBounds();
if (Rect.intersects(playerRect, pRect)) {
Rect intersection = playerRect;
intersection.intersect(pRect);
if (player.getVelocity() != player.GRAVITY) {
int resolutionHeight;
if (player.getVelocity() < player.GRAVITY)
resolutionHeight = intersection.height();
else {
resolutionHeight = -intersection.height();
player.onGround = true;
}
player.setVelocity(0);
player.desiredPos = new Point(player.desiredPos.x, player.desiredPos.y + resolutionHeight);
}
}
}
player.setPos();
}
}
作为一个额外的注释，我已经删除了一些不必要的代码来处理实体和实体健康等的图像。此外，我已经删除了空方法和那些与之无关的东西。< / p>
[编辑]剪掉大部分绘图代码和导入。所有绝对必要的东西都在那里。
答案 0 :(得分：0)
player.desiredPos = new Point(player.desiredPos.x, player.desiredPos.y + resolutionHeight);
这不是“向上移动，从不向右/向左移动吗？”
我认为您的Rect.intersects方法应返回{ NONE, LEFT, RIGHT, UP, DOWN }中的一个，指示发生碰撞的方向。所以你可以在正确的方向上对碰撞作出反应......