Question

我目前正在开展一个游戏项目，其中对象从屏幕顶部掉落，而底部的人需要抓住正确的对象。

Texture2D blockTexture;

List<Vector2> blockPositions = new List<Vector2>();
float BlockSpawnProbability = 0.01f;
const int BlockFallSpeed = 2;

以下是产生新的下降块

if (random.NextDouble() < BlockSpawnProbability)
{
 float x = (float)random.NextDouble() *
 (Window.ClientBounds.Width - blockTexture.Width);
 blockPositions.Add(new Vector2(x, -blockTexture.Height));
}


personHit = false;
for (int i = 0; i < blockPositions.Count; i++)
 {
  // Animate this block falling
blockPositions[i] =
 new Vector2(blockPositions[i].X,
             blockPositions[i].Y + BlockFallSpeed);
// Get the bounding rectangle of this block
Rectangle sprite =
new Rectangle((int)blockPositions[i].X, (int)blockPositions[i].Y,
                    blockTexture.Width, blockTexture.Height);

// check collision with person
if (personRectangle.Intersects(sprite))
  personHit = true;
if (blockPositions[i].Y > Window.ClientBounds.Height)
  {
   blockPositions.RemoveAt(i);
   i--;
  }
 }
 base.Update(gameTime);
}

绘制块

foreach (Vector2 blockPosition in blockPositions)
spriteBatch.Draw(blockTexture, blockPosition, Color.White);

我理解，如果有人说他们没有在这里给出我们的答案，但我只是想要一些帮助，以及如何做到这一点......

如何制作一个数组，其中随机拾取对象并从屏幕上掉落而不是逐个添加Texture2D。

我确实试图找到关于此的教程，但我不能.. 我会感激任何帮助。

Answer 1

在我的游戏中，我总是有相同的模式（更少或更相似）。

我有一个用于项目类的类来保留常规属性：

public class ItemClass
{
    public int ID;
    public string Name;
    public int Points;
    public Texture2D Texture;

    public ItemClass(int pID, int pName, int pPoints, int pTetxure2D)
    {
        this.ID = pID;
        this.Name = pName;
        this.Points = pPoints;
        this.Texture = pTexture;
    }

    public Item New()
    {
        return new Item(this.ID);
    }
}

用于保存单个属性的项目实例的一个类：

public class Item
{
    public int ClassID;
    public Vector2D Position;

    public Item(int pClassID)
    {
        this.ClassID = pClassID;
    }
}

游戏类的主要部分：

public CoolGame : Game
{
    private Dictionary<int, ItemClass> itemClasses; // each item class should nave unique ID
    private List<Item> items; // real items; better also make as dictionary with unique ID for each
    private SpriteBatch spriteBatch;

    // call in LoadContent to register all item classes you want use in game
    private LoadItemClasses()
    {
        this.itemClasses = new Dictionary<int, ItemClass>();
        this.itemClasses.Add(0, new ItemClass(0, "Silver coin", 1, silver_coin_texture));
        this.itemClasses.Add(1, new ItemClass(1, "Gold Coin", 3, gold_coin_texture));
        this.itemClasses.Add(2, new ItemClass(2, "Diamond", 10, diamond_texture));
        this.itemClasses.Add(3, new ItemClass(3, "Anchor", -5, anchor_texture));
        /// and so on...

        this.items = new List<Item>();
    }

    // call to create real item that you can draw and catch
    private void CreateRandomItem()
    {
        Vector2D randomPosition = ...;
        int randomItemClassID = ...;
        ItemClass itemClass = this.itemClasses[randomItemClassID];
        Item item = itemClass.New();
        item.Position = randomPosition;
        this.items.Add(item);
    }

    private void UpdateItems()
    {
        foreach (Item item in this.items)
        {
            // update item position, check collision and so on
        }
    }

    // you use position from item, but texture from itemClass, so you can use only one Texture2D object for whole your items of this class
    private void DrawItems()
    {
        ItemClass itemClass = null;
        this.spriteBatch.Begin();
        foreach (Item item in this.items)
        {
            itemClass = this.itemClasses[item.ClassID];
            spriteBatch.Draw(itemClass.Texture, item.Position, color.White);
        }

        this.spriteBatch.End();
    }
}

还谷歌一些关于瓷砖地图，以提高你的游戏性能。

如何在XNA中从屏幕顶部掉落1个以上的Texture2d？

1 个答案: