Question

我正在尝试按照教程帮助我学习如何创建平台游戏。但是，每当我测试我的代码时，我的播放器都会经历背景（命名为背景而不是背景）。我试图添加更多的点来阻止它这样做，但它只是继续。任何有hitTestPoint或flash经验的人都可以帮助我！

查看我的代码的Bumping部分

http://as3gametuts.com/2012/01/08/platformer-3/ ---使用此功能。

背景只是玩家所站的平台。 hitTestPoint代码应该阻止玩家通过平台掉落或穿过墙壁。有时候，当玩家进展很慢时，hitTestPoint会起作用。

import flash.events.KeyboardEvent;
import flash.geom.Point;

stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler);
stage.addEventListener(KeyboardEvent.KEY_UP, keyUpHandler);
stage.addEventListener(Event.ENTER_FRAME, loop);

var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
var upPressed:Boolean = false;
var downPressed:Boolean = false;

var leftReleased:Boolean = false;
var rightReleased:Boolean = false;
var upReleased:Boolean = false;
var downReleased:Boolean = false;

var xSpeed:int = 10;
var ySpeed:int = 10;

var scrollX:int = 0;
var scrollY:int = 0;

var speedConstant:int = 5;
var friction:Number = 0.95;

var leftBumping:Boolean = false;
var rightBumping:Boolean = false;
var upBumping:Boolean = false;
var downBumping:Boolean = false;

var upleftBumping:Boolean = false;
var uprightBumping:Boolean = false;
var downrightBumping:Boolean = false;
var downleftBumping:Boolean = false;

var leftBumpPoint:Point = new Point(-30, -55)
var upleftBumpPoint:Point = new Point(-30, -87)
var rightBumpPoint:Point = new Point(30, -55)
var uprightBumpPoint:Point = new Point(30, -87)
var upBumpPoint:Point = new Point(0, -120)
var downBumpPoint:Point = new Point(0, 0)
var downrightBumpPoint:Point = new Point(30, -27)
var downleftBumpPoint:Point = new Point(-30, -27)



function keyDownHandler(e:KeyboardEvent):void{
    if(e.keyCode == Keyboard.LEFT){
        leftPressed = true;
      } else if(e.keyCode == Keyboard.RIGHT) {
            rightPressed = true;
      } else if(e.keyCode == Keyboard.UP)  {
            upPressed = true; 
      } else if(e.keyCode == Keyboard.DOWN) {
            downPressed = true;
      }

}

   function keyUpHandler(e:KeyboardEvent):void{
       if(e.keyCode == Keyboard.LEFT){
           leftPressed = false;
       } else if(e.keyCode == Keyboard.RIGHT){
           rightPressed = false;
       } else if(e.keyCode == Keyboard.UP){
           upPressed = false;
       } else if(e.keyCode == Keyboard.DOWN){
           downPressed = false;
       }


   }
/*
function keyUpHandler(e:KeyboardEvent):void{
    if(e.keyCode == Keyboard.LEFT){
        leftReleased = true;
    } else if(e.keyCode == Keyboard.RIGHT){
        rightReleased = true;
    } else if(e.keyCode == Keyboard.UP){
        upReleased = true;
    } else if(e.keyCode == Keyboard.DOWN){
        downReleased = true;
    }

}*/



function loop(e:Event):void{


    if(back.hitTestPoint(player.x + leftBumpPoint.x, player.y + leftBumpPoint.y, true)){
    trace("leftBumping");
    leftBumping = true;
} else {
    leftBumping = false;
}


    if(back.hitTestPoint(player.x + rightBumpPoint.x, player.y + rightBumpPoint.y, true)){
    trace("rightBumping");
    rightBumping = true;
} else {
    rightBumping = false;
}
    if(back.hitTestPoint(player.x + upBumpPoint.x, player.y + upBumpPoint.y, true)){
    trace("upBumping")
    upBumping = true;
} else { 
    upBumping = false;
}

    if(back.hitTestPoint(player.x + downBumpPoint.x, player.y + downBumpPoint.y, true)){
    trace("downBumping")
    downBumping = true;
    } else {
        downBumping = false;
    }

    if(back.hitTestPoint(player.x + upleftBumpPoint.x, player.y + upleftBumpPoint.y, true)){
    trace("upleftBumping")
    upleftBumping = true;
    } else {
        upleftBumping = false;
    }

    if(back.hitTestPoint(player.x + uprightBumpPoint.x, player.y + uprightBumpPoint.y, true)){
    trace("uprightBumping")
    uprightBumping = true;
    } else {
        uprightBumping = false;
    }

    if(back.hitTestPoint(player.x + downrightBumpPoint.x, player.y + downrightBumpPoint.y, true)){
    trace("downrightBumping")
    downrightBumping = true;
    } else {
        downrightBumping = false;
    }

    if(back.hitTestPoint(player.x + downleftBumpPoint.x, player.y + downleftBumpPoint.y, true)){
    trace("downleftBumping")
    downleftBumping = true;
    } else {
        downleftBumping = false;
    }




        if(leftPressed){
        xSpeed -= speedConstant ;
    } else if(rightPressed){
        xSpeed += speedConstant;
    } else if(upPressed){
        ySpeed += speedConstant;
    } else if(downPressed){
        ySpeed -= speedConstant;
    }



    if(leftBumping){
        if(xSpeed < 0){
        xSpeed *= -0.5;
    }
}

if(rightBumping){
    if(xSpeed > 0){
        xSpeed *= -0.5;
    }
}

if(upBumping){
    if(ySpeed < 0){
        ySpeed *= -0.5;
    } 
}

if(downBumping){
    if(ySpeed > 0){
        ySpeed *= -0.5;
    }
}
    xSpeed *= friction;
    ySpeed *= friction;

    scrollX -= xSpeed;
    scrollY += ySpeed;

    back.x = scrollX;
    back.y = scrollY;

}

Answer 1

我没有分析整个代码，但它看起来像是典型的子弹场景。如果你只针对宽度小于玩家速度的障碍物测试一个点，你偶尔会错过障碍物，因为在一帧中测试点在它的一侧而在另一帧中在另一帧中 - 点在两者上都没有击中它帧。解决问题的最简单方法就是确保您的障碍物的宽度大于玩家的速度。另一种方法是测试测试点位置之间的中间点。您可以通过Point.interplate()方法轻松完成此操作，此外，您还可以根据玩家的速度和obsticles的大小调整中间测试的数量。但是自从你开始使用Box2D之后，你可以在对象物理属性中设置一个子弹标记。

如何正确使用hitTestPoint播放器？

1 个答案: