Phaser主角内置小型Hitbox与墙体碰撞检测失效问题排查

我需要实现主角（protagonist）内部的小型hitbox与墙体的碰撞检测，以此实现主角能够贴近墙体行走的效果，但当前碰撞检测失效了。核心涉及walls图层与hitbox精灵，相关代码如下：

preload(){
  //all the assets here
}
create() {
  console.log('create method executed');

  const characterPositionInWorldMap = 3700;
  this.hitbox = this.physics.add.sprite(characterPositionInWorldMap, 250, null); // we need collision for this
  this.protagonist = this.physics.add.sprite(characterPositionInWorldMap, 250, 'protagonist');
  
  // Initialize the hitbox sprite for collision detection
  this.hitbox.setSize(10, 10); // Set hitbox size (adjust as needed)

  this.protagonist.setDepth(3);
  this.hitbox.setDepth(3);
  const map = this.make.tilemap({ key: 'map' });
  this.animatedTiles.init(map);
  this.physics.world.createDebugGraphic();

// Add the tilesets...

// Create layers from tilemap data using different tilesets
const groundLayer = map.createLayer('Groundlayer', darkTileset, 0, 0);
const waterLayer = map.createLayer('waterlayer', darkTileset, 0, 0);
const grassLayer = map.createLayer('grass_and_tree_layer', darkTileset, 0, 0);
const stoneLayer = map.createLayer('stones_n_stuff', darkTileset, 0, 0);

// Create hut layer using the hut tileset
const hutLayer = map.createLayer('hutLayer', hutTileset, 0, 0);
const transportlayer = map.createLayer('transportlayer', hutTileset, 0, 0);
const walls = map.createLayer('walls', hutTileset, 0, 0);

  // Adjust the depth of layers as needed
  groundLayer.setDepth(1);
  waterLayer.setDepth(0);
  grassLayer.setDepth(1);
  stoneLayer.setDepth(2);
  hutLayer.setDepth(3);
  walls.setDepth(4);
  transportlayer.setDepth(10);

  // Enable collision detection between player and walls layer
  const collidableTileIndexes = [
    1279,1278,1244,1225,1257,1267,1302,1302,1320,1305,1277,1298,1307,1288,1319,1320,1321,1225,1223,1244
];

  collidableTileIndexes.forEach(index => {
    map.setCollision(index, true, walls);
});

  //animations....
 
  // Enable physics for the protagonist
  this.physics.world.setBounds(0, 0, map.widthInPixels, map.heightInPixels);

  // Listen for collision between hitbox and walls
this.physics.add.collider(this.hitbox, walls, () => {
// Disable movement controls for the protagonist
//this.protagonist.setVelocity(0); // Stop the protagonist's movement
console.log("hitbox hit")
});

// Listen for when hitbox stops colliding with walls
this.physics.add.collider(this.hitbox, walls, () => {
// Re-enable movement controls for the protagonist
// You may need to adjust this depending on how your movement controls are implemented
// For example, if you're using velocity-based movement, reset the velocity to allow movement
this.protagonist.setVelocity(0); // Reset velocity
});

this.groundLayer = groundLayer;
this.waterLayer = waterLayer;
this.grassLayer = grassLayer;
this.stoneLayer = stoneLayer;
this.hutLayer = hutLayer;
this.walls = walls;
this.transportlayer = transportlayer;

 // Set up camera to follow the player
 this.cameras.main.startFollow(this.protagonist);

}

update() {
  // Reset velocity
  this.protagonist.setVelocity(0);
  
  this.physics.collide(this.hitbox, this.walls, this.handleWallCollision, null, this);
    // Update the hitbox sprite position to match the player sprite
    this.hitbox.setPosition(this.protagonist.x, this.protagonist.y);
    ...
}

• 移除重复的碰撞器注册：
  你在create方法里两次调用this.physics.add.collider绑定hitbox和walls，且在update里又重复调用this.physics.collide，这会导致碰撞逻辑混乱。只需要在create中添加一次碰撞器即可，update里无需重复调用。

• 调整Hitbox位置更新顺序：
  在update中，要先更新hitbox的位置到主角当前坐标，再让物理引擎处理碰撞。把this.hitbox.setPosition(this.protagonist.x, this.protagonist.y)移到this.physics.collide之前。

• 修正碰撞回调逻辑：
  第二次添加的碰撞器会导致重复触发，且回调里的this.protagonist.setVelocity(0)逻辑错误（碰撞时重置速度会导致主角无法移动）。如果需要监听碰撞开始和结束，应该使用Phaser的碰撞事件：

  // 在create中替换原有的两个collider
  const collider = this.physics.add.collider(this.hitbox, walls, () => {
    console.log("hitbox hit");
    // 这里处理碰撞时的逻辑，比如限制主角向墙体方向的移动
  });
  
  // 监听碰撞结束事件
  collider.events.on('collisionend', () => {
    console.log("hitbox left wall");
    // 恢复对应方向的移动权限
  });
  

• 优化Hitbox的物理属性：
  由于hitbox完全跟随主角移动，不需要物理引擎驱动它的位置，所以可以关闭其自动移动：

  this.hitbox.body.moves = false;
  

• 验证墙体碰撞设置：
  利用this.physics.world.createDebugGraphic()生成的调试图形，检查walls图层的碰撞体是否正确显示，以及hitbox的碰撞框是否和预期一致。同时确认collidableTileIndexes中的tile索引确实是walls图层中需要碰撞的瓦片。

内容的提问来源于stack exchange，提问作者Aftersun Lotion