我的游戏设置如下：
INSERT INTO @tmpOptions(CODE_OPTION, PRINT_TEXT)
SELECT data.id.value('CODE_DATA[1]','INT')),
option.id.value('CODE_OPTION[1]','INT'))
option.id.value('PRINT_TEXT[1]','VARCHAR(50)'))
FROM @xml.nodes('ROOT_NODE/FOLDER_LIST/FOLDER') as folder(Id)
CROSS APPLY folder.Id.nodes('DATA_LIST/DATA') as data(Id)
CROSS APPLY data.Id.nodes('OPTIONS/OPTION') as option(Id)
目前，我可以检查var game = new Phaser.Game(800, 600, Phaser.AUTO, '', {preload: preload, create: create, update: update});
var platforms;
var aGroup;
function preload() {
game.load.image('platform', 'img/platform.png');
game.load.image('a', 'img/a.png');
}
function create() {
game.physics.startSystem(Phaser.Physics.ARCADE);
platforms = game.add.group();
platforms.enableBody = true;
var platform = platforms.create(100, 100, 'platform');
aGroup = game.add.group();
aGroup.enableBody = true;
platforms.forEach(function(item) {
item.body.immovable = true;
aGroup.create(item.x, item.y - 32, 'a');
}, this);
aGroup.forEach(function(a) {
a.body.velocity.x = 100;
}
}
function update() {
game.physics.arcade.collide(aGroup, platforms);
aGroup.forEach(function(a) {
if(a.body.blocked.right) {
a.body.velocity.x = -100;
}
else if(a.body.blocked.left) {
a.body.velocity.x = 100;
}, this);
}
}
是否与世界边界发生碰撞，如果发生这种情况，则会改变方向。现在当a到达平台的末端时，它就会掉下来。我希望a在到达平台末端时改变方向。
我该怎么做？