Question

我正在关注

上的这个教程

Youtube：

https://www.youtube.com/watch?v=ohlrknEwobs&list=PLE10sFVGtI1ejzPFmX5CebHrTMhaCx2oI&index=31

这个概念是制作一个避免游戏，其中3个物体垂直落下，其中一个会增加点数，另外两个会结束游戏。

我在数组中创建了4个对象，如下所示：

var:objects Array = [new BlueBird(),new RedBird(),new Goomba(),new Ham()]

// objects [0] =是一只跳到场景3的蓝鸟（“死亡场景”）

// objects [1] =是一只跳到场景3的红鸟（“死亡场景”）

// objects [2] = Goomba跳转到场景3（“死亡场景”）

// objects [3] =是一块添加了点数的火腿

以下是我遇到问题的陈述。我无法得到对象[3]，一块Ham，来测试else if语句。我编码＆amp;＆amp; objectsIndex == 3，但它不起作用：

if((Pig.hit).hitTestObject(objects[objectsIndex]))
   {
        // Reset objects to y positions
      objects[objectsIndex].x = randomRange(0,3) * 50
      objects[objectsIndex].y = -50;

      stage.removeEventListener(KeyboardEvent.KEY_DOWN,pressedButton);
      stage.removeEventListener(Event.ENTER_FRAME,CollisionSensor);
      stage.frameRate = 24;

      gotoAndStop(1,"GG WP");
      //trace ("you died!");
   }
else if((Pig.hit).hitTestObject(objects[objectsIndex]) && objectsIndex == 3)
    {

    score = score + 1;  //increase score by 1 point
        text1.text = String(score); // Score is now a string value
                                    // Since text1 is a text box, it must be denotated as a  string
        // Reset the objects to y positions
        objects[objectsIndex].x = randomRange(0,3) * 50;
        objects[objectsIndex].y = -50
    }

以下是整个项目代码参考：

    stop();

import flash.events.Event;

stage.focus = this;

stage.addEventListener(KeyboardEvent.KEY_DOWN, pressedButton);
stage.addEventListener(Event.ENTER_FRAME, CollisionSensor);

var score:Number = 0;   //Player Score
var enemy_velocity:Number = 5;
var objects:Array = [new RedBird(),new Goomba,new BlueBird(),new Ham()];

// objects[0] is a RedBird
// objects[1] is a Goomba
// objects[2] is a BlueBird
// objects[3] is an piece of Ham

var objectsIndex:Number = randomRange(0,3);     //Randomizer
                                                //Picks a random array value
for (var i:int=0; i<objects.length; i++)
{
    objects[i].x = randomRange(0,3) * 50;
    objects[i].y = -50;

    //Brings objects to stage
    stage.addChild(objects[i]);
}


//Generate a ranodom number from minNum to maxNum including the endpoints
function randomRange(minNum:Number, maxNum:Number):Number
{
    return (Math.floor(Math.random() * (maxNum - minNum + 1)) + minNum);
}


function CollisionSensor(e:Event)
{

    objects[objectsIndex].y = objects[objectsIndex].y + enemy_velocity;

    // check if enemy objects have gone past the bottom of the game screen
    if (objects[objectsIndex].y > stage.stageHeight)
    {
        objects[objectsIndex].y = -50; //Resets objects in array and parameters
                            // To enter frame in a repeated loop

        //Randomizes a random x position for Objects
        var num:Number = randomRange(0,3);
        //This creates 4 random x positions - 0,50,100,150 To randomly place
        //The array objects in
        objects[objectsIndex].x = num * 50;

        // now pick a random object
        objectsIndex = randomRange(0,3);
        // objects[0] is a RedBird
        // objects[1] is a Goomba
        // objects[2] is a BlueBird
        // objects[3] is an piece of Ham




if(stage.frameRate <= 60)
{
    stage.frameRate = stage.frameRate + 5;
}
else
{
    stage.frameRate = 60;

    if (enemy_velocity <= 25)
    {
        enemy_velocity += 1; 
    }
    else
    {
        enemy_velocity = 25;
    }
  }
}

//check contanct with enemy objects



if((Pig.hit).hitTestObject(objects[objectsIndex]))
       {
            // Reset objects to y positions
          objects[objectsIndex].x = randomRange(0,3) * 50
          objects[objectsIndex].y = -50;

          stage.removeEventListener(KeyboardEvent.KEY_DOWN,pressedButton);
          stage.removeEventListener(Event.ENTER_FRAME,CollisionSensor);
          stage.frameRate = 24;

          gotoAndStop(1,"GG WP");
          //trace ("you died!");
       }


else if((Pig.hit).hitTestObject(objects[objectsIndex]) && objectsIndex == 3)
        {

        score = score + 1;

//increase score by 1 point
        `text1.text = String(score);` // Score is now a string value
                                    // Since text1 is a text box, it must be denotated as a string
        // Reset the objects to y positions


objects[objectsIndex].x = randomRange(0,3) * 50;
            objects[objectsIndex].y = -50
        }
}


function pressedButton(event:KeyboardEvent):void
{
    if (event.keyCode == Keyboard.LEFT && Pig.x >= 0)
    {
        Pig.x = Pig.x - 50;
    }
    else if (event.keyCode == Keyboard.RIGHT && Pig.x <= 150)
    {
        Pig.x = Pig.x + 50;
    }
}

谢谢你，并一如既往地度过美好的一天：）

Answer 1

您的代码可能还有其他问题，但这看起来不错

if((Pig.hit).hitTestObject(objects[objectsIndex]))

它应该是..

if((Pig).hitTestObject(objects[0]))

其中objects[0]将是要访问以进行测试的数组中的索引。但这甚至可能有问题，所以获得你在舞台上添加的内容的具体名称在你的for loop中尝试这个，将对象添加到舞台

//Brings objects to stage
stage.addChild(objects[i]);
trace ("added object name : " + objects[i] );

无论你得到什么名字，都会对if( (Pig).hitTestObject(namehere) )

进行测试

ActionScript 3 If / Else If Statement

1 个答案: