我正在开发一个有两个控件的starling游戏。一个是用户左手拇指触摸屏幕左侧的任何位置，从而在y轴上向上和向下拖动角色。我无法实现的另一个控件是屏幕右下方的一个按钮，可以让角色发射子弹。
我的问题是，当按下按钮时，如何在不将角色跳到屏幕底部的情况下进行设置。
我是否需要弄乱多点触控才能让它运行？
我有一个更具体的问题是如何在starling中为精灵定义矩形？由于starling没有绘图API，我不能这样做......
touchLayer.graphics.beginFill(0x000000, 0);
touchLayer.graphics.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
touchLayer.graphics.endFill();
目前我的角色拖动工作正常，但触摸屏会在屏幕上的任何地方进行注册（我不知道如何让它只在屏幕的左侧...）
任何建议将不胜感激，谢谢。
以下是我要求的InGame类的完整代码。
package screens
{
import flash.geom.Point;
import flash.geom.Rectangle;
import flash.utils.getTimer;
import objects.Enemy;
import objects.GameBackground;
import objects.Laser;
import objects.Scarlet;
import objects.SnowBall;
import starling.display.Button;
import starling.display.Sprite;
import starling.events.Event;
import starling.events.Touch;
import starling.events.TouchEvent;
import starling.utils.RectangleUtil;
import starling.utils.deg2rad;
public class InGame extends Sprite
{
private var startBtn:Button;
private var fireBtn:Button;
private var bg:GameBackground;
private var scarlet:Scarlet;
private var enemies:Array;
private var lasers:Array;
private var scarletLocation:Point;
private var lasersLayer:Sprite;
private var enemiesLayer:Sprite;
private var touchLayer:Sprite;
private var enemySpawnDelay:Number;
private var enemySpawnCounter:Number;
private var difficulty:Number;
private var difficultyRate:Number;
private var timePrevious:Number;
private var timeCurrent:Number;
private var elapsed:Number;
private var gameState:String;
private var playerSpeed:Number;
private const MIN_SPEED:Number = 650;
//private var scoreDistance:int;
private var gameArea:Rectangle;
private var touchArea:Rectangle;
private var shape:starling.display.Sprite = new starling.display.Sprite();
private var target:Point = new Point(100, 100);
private var touch:Touch;
private var touchX:Number;
private var touchY:Number;
public function InGame()
{
super();
this.addEventListener(starling.events.Event.ADDED_TO_STAGE, onAddedToStage);
}
private function onAddedToStage(event:Event):void
{
this.removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
drawGame();
}
private function drawGame():void
{
bg = new GameBackground();
this.addChild(bg);
scarlet = new Scarlet;
scarlet.x = stage.stageWidth/2;
scarlet.y = stage.stageHeight/2;
this.addChild(scarlet);
startBtn = new Button(Assets.getTexture("PlayBtn"));
startBtn.x = stage.stageWidth * 0.5 - startBtn.width * 0.5;
startBtn.y = stage.stageHeight * 0.5 - startBtn.height * 0.5 + 35;
this.addChild(startBtn);
fireBtn = new Button(Assets.getTexture("FireBtn"));
fireBtn.x = 675;
fireBtn.y = 435;
this.addChild(fireBtn);
//defines area scarlet can fly in
gameArea = new Rectangle(0, 15, stage.stageWidth, stage.stageHeight - 150);
}
public function disposeTemporarily():void
{
this.visible = false;
}
public function initialize():void
{
this.visible = true;
this.addEventListener(Event.ENTER_FRAME, checkElapsed);
scarlet.x = -stage.stageWidth;
scarlet.y = stage.stageHeight * 0.5;
gameState = "idle";
playerSpeed = 0;
difficultyRate = 0.3;
difficulty = 1;
enemySpawnDelay = enemySpawnCounter = 100;
enemies = new Array();
lasers = new Array();
scarletLocation = new Point(200, 400);
addEventListener(Event.ENTER_FRAME, update);
lasersLayer = new Sprite();
enemiesLayer = new Sprite();
touchLayer = new Sprite();
addChild(lasersLayer);
addChild(enemiesLayer);
addChild(touchLayer);
addEventListener(Event.ADDED_TO_STAGE, setupTouchLayer);
touchLayer.addEventListener(Event.TRIGGERED, shootLaser);
//scoreDistance = 0;
startBtn.addEventListener(Event.TRIGGERED, onStartBtnClick);
this.addEventListener(TouchEvent.TOUCH, onTouch);
}
private function onStartBtnClick(event:Event):void
{
startBtn.visible = false;
startBtn.removeEventListener(Event.TRIGGERED, onStartBtnClick);
launchScarlet();
}
private function launchScarlet():void
{
this.addEventListener(TouchEvent.TOUCH, onTouch);
this.addEventListener(Event.ENTER_FRAME, onGameTick);
}
private function onTouch(event:TouchEvent):void
{
touch = event.getTouch(stage);
touchX = touch.globalX;
touchY = touch.globalY;
target.x = event.touches[0].globalX;
target.y = event.touches[0].globalY;
}
private function onGameTick(event:Event):void
{
switch(gameState)
{
case"idle":
//Take off
if (scarlet.x < stage.stageWidth * 0.5 * 0.5)
{
scarlet.x += ((stage.stageWidth * 0.5 * 0.5 + 10) - scarlet.x) * 0.5;
scarlet.y = stage.stageHeight * 0.5;
playerSpeed += (MIN_SPEED - playerSpeed) * 0.05;
}
else
{
gameState = "flying";
}
break;
case"flying":
playerSpeed -= (playerSpeed - MIN_SPEED) * 0.01;
scarlet.y -= (scarlet.y - touchY) * 0.1;
if (-(scarlet.y - touchY) < 150 && -(scarlet.y - touchY) > -150)
{
scarlet.rotation = deg2rad(-(scarlet.y - touchY) * 0.075);
}
if (scarlet.y > gameArea.bottom - scarlet.height * 0.5)
{
scarlet.y = gameArea.bottom - scarlet.height * 0.5;
scarlet.rotation = deg2rad(0);
}
if (scarlet.y < gameArea.top + scarlet.height * 0.5)
{
scarlet.y = gameArea.top + scarlet.height * 0.5;
scarlet.rotation = deg2rad(0);
}
//scoreDistance += (playerSpeed * elapsed) * 0.1;
//trace(scoreDistance);
break;
case"over":
break;
}
}
//addapted from "Shoot"
private function setupTouchLayer(event:Event):void
{
touchLayer.graphics.beginFill(0x000000, 0);
touchLayer.graphics.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
touchLayer.graphics.endFill();
touchArea = new Rectangle(0, 0, stage.stageWidth, stage.stageHeight);
}
private function shootLaser(event:TouchEvent):void
{
makeLaser(scarletLocation);
}
private function makeLaser(scarletLocation:Point):void
{
var newLaser:Laser = new Laser();
newLaser.x = scarletLocation.x;
newLaser.y = scarletLocation.y;
newLaser.xVel = 5;
newLaser.yVel = 5;
newLaser.addEventListener(Laser.PURGE_EVENT, purgeLaserHandler);
lasersLayer.addChild(newLaser);
lasers.push(newLaser);
}
private function purgeLaserHandler(event:Event):void
{
var targetLaser:Laser = Laser(event.target);
purgeLaser(targetLaser);
}
private function purgeLaser(targetLaser:Laser):void
{
targetLaser.removeEventListener(Laser.PURGE_EVENT, purgeLaserHandler);
try
{
var i:int;
for (i = 0; i < lasers.length; i++)
{
if (lasers[i].name == targetLaser.name)
{
lasers.splice(i, 1);
lasersLayer.removeChild(targetLaser);
i = lasers.length;
}
}
}
catch(e:Error)
{
trace("Failed to delete laser!", e);
}
}
private function makeEnemies():void
{
enemySpawnCounter++;
if (enemySpawnCounter > enemySpawnDelay)
{
enemySpawnCounter = 0;
enemySpawnDelay -= difficultyRate;
difficulty += difficultyRate;
makeEnemy();
}
}
private function makeEnemy():void
{
var i:int;
for (i = 0; i < Math.floor(difficulty); i++)
{
var newEnemy:Enemy = new SnowBall();
newEnemy.x = 925;
newEnemy.y = Math.random() * 375 + 50;
//trace(newEnemy.x); trace(newEnemy.y);
newEnemy.xVel = (-Math.random() * difficulty) - 5;
newEnemy.sinMeter = Math.random() * 10;
newEnemy.bobValue = Math.random() * difficulty;
newEnemy.addEventListener(Enemy.PURGE_EVENT, purgeEnemyHandler);
enemiesLayer.addChild(newEnemy);
enemies.push(newEnemy);
}
}
private function purgeEnemyHandler(event:Event):void
{
var targetEnemy:Enemy = Enemy(event.target);
purgeEnemy(targetEnemy);
}
private function purgeEnemy(targetEnemy:Enemy):void
{
targetEnemy.removeEventListener(Enemy.PURGE_EVENT, purgeLaserHandler);
try
{
var i:int;
for (i = 0; i < enemies.length; i++)
{
if (enemies[i].name == targetEnemy.name)
{
enemies.splice(i, 1);
enemiesLayer.removeChild(targetEnemy);
i = enemies.length;
}
}
}
catch(e:Error)
{
trace("Failed to delete enemy!", e);
}
}
private function newHitTest(laser:Laser):void
{
for each (var enemy:Enemy in enemies)
{
if (enemy.status != "Dead" && enemy.hitTest(new Point(laser.x, laser.y)))
{
enemy.destroy();
purgeLaser(laser);
}
}
}
private function checkElapsed(event:Event):void
{
timePrevious = timeCurrent;
timeCurrent = getTimer();
elapsed = (timeCurrent - timePrevious) * 0.001;
}
private function update():void
{
//trace(enemies.length, lasers.length);
for each (var enemy:Enemy in enemies)
{
enemy.update();
}
for each (var laser:Laser in lasers)
{
laser.update();
newHitTest(laser);
}
makeEnemies();
}
//addapted from "Shoot"
}
}
答案 0 :(得分：0)
Starling.multitouchEnabled = true;
然而，当我按下右下方的按钮时，这仍然会让我的角色跳到屏幕底部的问题如果我没有触摸屏幕已经控制角色...不是真的很重要但是它如果没有发生这种情况会更好看。