我正在尝试从var武器中制造一颗“子弹”朝某个方向射击，这颗子弹实际上是一个神奇宝贝球，因为我只是在做练习游戏。
我似乎无法让“子弹”朝我想要的方向前进，我输入:weapon.body.velocity.x = -100;下:if (cursors.left.isDown)
但这不起作用，当我按任意键时，屏幕就会卡住。
请帮我让‘子弹’朝我想要的方向飞去。
var items;
var game;
var player;
var weapon;
var cursors;
var fireButton;
function addItems() {
items = game.add.physicsGroup();
createItem(100, 400, 'coin');
}
function createItem(left, top, image) {
var item = items.create(left, top, image);
item.animations.add('spin');
item.animations.play('spin', 10, true);
}
function itemHandler(player, item) {
item.kill();
}
window.onload = function () {
game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', { preload: preload, create: create, update: update, render: render });
function preload() {
game.stage.backgroundColor = ('#424242');
game.load.spritesheet('coin', 'coin.png', 36, 44);
game.load.spritesheet('player', 'hero.png', 64, 64);
game.load.spritesheet('bullet', 'Pokeball.png');
}
function create() {
player = this.game.add.sprite(100, 200, 'player');
// ANIMATION FOR PLAYER CONTROLS
down = player.animations.add('down', [0,1,2,3], 10, true);
left = player.animations.add('left', [4,5,6,7], 10, true);
right = player.animations.add('right', [8,9,10,11], 10, true);
up = player.animations.add('up', [12,13,14,15], 10, true);
// enable physics in the game (can't go through walls, gravity, etc.)
game.physics.enable(player, Phaser.Physics.ARCADE);
game.physics.startSystem(Phaser.Physics.P2JS);
game.physics.startSystem(Phaser.Physics.ARCADE);
game.physics.p2.enable(player);
player.body.setSize(30, 45, 16, 12);
player.body.immovable = false;
// enable keyboard arrows for controls
cursors = game.input.keyboard.createCursorKeys();
// camera will follow the character
game.camera.follow(player);
addItems();
// Creates 1 single bullet, using the 'bullet' graphic
weapon = game.add.weapon(1, 'bullet');
// The bullet will be automatically killed when it leaves the world bounds
weapon.bulletKillType = Phaser.Weapon.KILL_WORLD_BOUNDS;
// Because our bullet is drawn facing up, we need to offset its rotation:
// The speed at which the bullet is fired
weapon.bulletSpeed = 400;
game.physics.arcade.enable(player);
// Tell the Weapon to track the 'player' Sprite, offset by 14px horizontally, 0 vertically
weapon.trackSprite(player, 30, 0);
cursors = this.input.keyboard.createCursorKeys();
fireButton = this.input.keyboard.addKey(Phaser.KeyCode.SPACEBAR);
}
function update() {
game.physics.arcade.overlap(player, items, itemHandler);
// PLAYER CONTROLS
player.body.velocity.set(0);
// player presses left key
if (cursors.left.isDown)
{
player.body.velocity.x = -100;
player.play('left');
}
// player presses right key
else if (cursors.right.isDown)
{
player.body.velocity.x = 100;
player.play('right');
}
// player presses up key
else if (cursors.up.isDown)
{
player.body.velocity.y = -100;
player.play('up');
}
// player presses down key
else if (cursors.down.isDown)
{
player.body.velocity.y = 100;
player.play('down');
}
// player does not press anything
else
{
player.animations.stop();
}
if (fireButton.isDown)
{
weapon.fire();
}
}
function render() {
weapon.debug();
}
}<script src="https://cdnjs.cloudflare.com/ajax/libs/phaser/3.18.1/phaser.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Simple Canvas Game</title>
<style>
html {
background: black
}
canvas {
margin: auto;
}
</style>
</head>
<body>
<script src="phaser.js"></script>
<script src="game.js"></script>
</body>
</html>最佳答案
尝试改变
weapon.trackSprite(player, 30, 0);
至
weapon.trackSprite(player, 30, 0, true);
Phaser 的文档说，如果您传递 true 作为第四个参数，那么它将跟随 Sprite 的旋转。
编辑:您当前没有对 Sprite 进行任何旋转，因此请更改检查玩家是否改变 Sprite 方向的 Angular :
if (cursors.left.isDown)
{
player.angle = 180;
}
else if (cursors.right.isDown)
{
player.angle = -90;
}
else if (cursors.up.isDown)
{
player.angle = 90;
}
// player presses down key
else if (cursors.down.isDown)
{
player.angle = 0;
}
这也会旋转你的玩家 Sprite ，所以也许这不是你想要的。
关于javascript - 如何让武器 'bullet'朝某个方向移动，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45621415/