Question

我已经尝试了一段时间了，我似乎无法让我的碰撞检测正常工作，此时我已将其注释掉了，因为它无法正常工作。

以下是我取消评论时遇到的错误。

错误

Argument 1: cannot convert from 'System.Collections.Generic.List<OOPigEatingApple.Apple>' to 'System.Windows.Controls.ContentControl'

The best overloaded method match for 'OOPigEatingApple.MainPage.DetectCollision(System.Windows.Controls.ContentControl, System.Windows.Controls.ContentControl)' has some invalid arguments

The best overloaded method match for 'OOPigEatingApple.MainPage.RemoveApple(OOPigEatingApple.Apple)' has some invalid arguments

问题是由于缺乏理解我无法解决这些错误，任何纠正这些问题的帮助都会很棒。

代码

namespace game
{
    public partial class MainPage : UserControl
    {
        Pig myPig;
        List<Apple> myapples;

        private int appleTimer = 0;
        //int appleCount = 0;

        public MainPage()
        {
            InitializeComponent();
            myPig = new Pig();
            myapples = new List<Apple>();

            Image myImg = new Image();
            myImg.Source = new BitmapImage(new Uri("pig3.png", UriKind.Relative));
            myImg.Width = 80;
            myImg.Height = 60;
            myPig.Content = myImg;
            LayoutRoot.Children.Add(myPig);
            Canvas.SetLeft(myPig,100);
            Canvas.SetTop(myPig, 50);

            foreach (Apple a in myapples)
            {
                LayoutRoot.Children.Add(a);
            }
            CompositionTarget.Rendering += new EventHandler(CompositionTarget_Rendering);
        }

        public void AddApple(Apple a)
        {
            myapples.Add(a);
            LayoutRoot.Children.Add(a);
        }

        public void RemoveApple(Apple a)
        {
            myapples.Remove(a);
            LayoutRoot.Children.Remove(a);
        }

        public void CompositionTarget_Rendering(object sender, EventArgs e)
        {
            appleTimer += 1;
            if (appleTimer > 60)
            {
                appleTimer = 0;
                AddApple(new Apple());
            }

            for (int indx = 0; indx < myapples.Count; indx++)
            {
                myapples[indx].Update(LayoutRoot);

            }

           // if (DetectCollision(myapples, myPig))
            {
             //     RemoveApple(myapples);
            }     
        }




        private void UserControl_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Up)
                this.myPig.Move(Direction.Up);
            if (e.Key == Key.Down)
                this.myPig.Move(Direction.Down);
            if (e.Key == Key.Left)
                this.myPig.Move(Direction.Left);
            if (e.Key == Key.Right)
                this.myPig.Move(Direction.Right);
        }

        public bool DetectCollision(ContentControl ctrl1, ContentControl ctrl2)

        {

            Rect ctrl1Rect = new Rect(
                    new Point(Convert.ToDouble(ctrl1.GetValue(Canvas.LeftProperty)),
                                         Convert.ToDouble(ctrl1.GetValue(Canvas.TopProperty))),
                                 new Point((Convert.ToDouble(ctrl1.GetValue(Canvas.LeftProperty)) + ctrl1.ActualWidth),
                                         (Convert.ToDouble(ctrl1.GetValue(Canvas.TopProperty)) + ctrl1.ActualHeight))
                         );

            Rect ctrl2Rect = new Rect(
        new Point(Convert.ToDouble(ctrl2.GetValue(Canvas.LeftProperty)),
                                        Convert.ToDouble(ctrl2.GetValue(Canvas.TopProperty))),
                                new Point((Convert.ToDouble(ctrl2.GetValue(Canvas.LeftProperty)) + ctrl2.ActualWidth),
                                        (Convert.ToDouble(ctrl2.GetValue(Canvas.TopProperty)) + ctrl2.ActualHeight))
                        );

            ctrl1Rect.Intersect(ctrl2Rect);
            return !(ctrl1Rect == Rect.Empty);
        }
    }
}

Answer 1

        for (int indx = 0; indx < myapples.Count; indx++)
        {
            myapples[indx].Update(LayoutRoot);
            bool collided = DetectCollision(myapples[indx], myPig);
            if (collided) {
                // the apple and the pig have collided. Do something here.
            }

        }

试试这个。

编辑：此外，如果您要在循环中删除苹果，请确保减少索引器，以免您跳过苹果：

            if (collided) {
                // the apple and the pig have collided. Do something here.
                RemoveApple(myapples[indx]);
                indx --;
            }

Answer 2

下面

if (DetectCollision(myapples, myPig))

您正在传递苹果列表作为第一个参数。但是，你的方法

public bool DetectCollision(ContentControl ctrl1, ContentControl ctrl2)

期望将内容控件作为第一个参数。这就是编译器在抱怨时的含义

参数1：无法转换为System.Collections.Generic.List＆＃39;到＆＃39; System.Windows.Controls.ContentControl＆＃39;

那不会奏效。内容控件是用户界面元素，而List是数据结构。它们是两个根本不同的东西。可能你的苹果来自内容控件，在这种情况下你仍然需要将一个 apple传递给方法而不是整个列表

如何进行碰撞检测？

2 个答案: