Question

类似于许多采用平铺地图的程序，如Terraria游戏中的地图，并将地图转换为整个地图的单张图片，我正在尝试做类似的事情。问题是，我的块纹理在一个大的纹理图集中，并由索引引用，我无法从单个块中获取颜色数据并将其放置在较大纹理中的正确位置。

到目前为止，这是我的代码。

从索引获取源代码（此代码有效）：

public static Rectangle GetSourceForIndex(int index, Texture2D tex)
    {
        int dim = tex.Width / TEXTURE_MAP_DIM;

        int startx = index % TEXTURE_MAP_DIM;
        int starty = index / TEXTURE_MAP_DIM;

        return new Rectangle(startx * dim, starty * dim, dim, dim);
    }

在索引处获取纹理（问题开始的地方）：

public static Texture2D GetTextureAtIndex(int index, Texture2D tex)
    {
        Rectangle source = GetSourceForIndex(index, tex);
        Texture2D texture = new Texture2D(_device, source.Width, source.Height);

        Color[] colors = new Color[tex.Width * tex.Height];
        tex.GetData<Color>(colors);
        Color[] colorData = new Color[source.Width * source.Height];

        for (int x = 0; x < source.Width; x++)
        {
            for (int y = 0; y < source.Height; y++)
            {
                colorData[x + y * source.Width] = colors[x + source.X + (y + source.Y) * tex.Width];
            }
        }

        texture.SetData<Color>(colorData);
        return texture;
    }

将纹理放入更大的图片中（这是完全错误的我确定）：

private void doSave()
    {
        int texWidth = this._rWidth * Region.REGION_DIM * 16;
        int texHeight = this._rHeight * Region.REGION_DIM * 16;

        Texture2D picture = new Texture2D(Game.GraphicsDevice, texWidth, texHeight);
        Color[] pictureData = new Color[picture.Width * picture.Height];

        for (int blockX = 0; blockX < texWidth / 16; blockX++)
        {
            for (int blockY = 0; blockY < texHeight / 16; blockY++)
            {
                Block b = this.GetBlockAt(blockX, blockY);
                Texture2D toCopy = TextureManager.GetTextureAtIndex(b.GetIndexBasedOnMetadata(b.GetMetadataForSurroundings(this, blockX, blockY)), b.GetTextureFile());
                Color[] copyData = new Color[toCopy.Width * toCopy.Height];
                Rectangle source = new Rectangle(blockX * 16, blockY * 16, 16, 16);
                toCopy.GetData<Color>(copyData);

                for (int x = 0; x < source.Width; x++)
                {
                    for (int y = 0; y < source.Height; y++)
                    {
                        pictureData[x + source.X + (y + source.Y) * picture.Width] = copyData[x + y * source.Width];
                    }
                }
            }
        }

        picture.SetData<Color>(pictureData);

        string fileName = "picture" + DateTime.Now.ToString(@"MM\-dd\-yyyy-h\-mm-tt");
        FileStream stream = File.Open(this.GetSavePath() + @"Pictures\" + fileName, FileMode.OpenOrCreate);
        picture.SaveAsPng(stream, picture.Width, picture.Height);

我找不到关于如何在纹理和一维颜色数组之间正确转换的任何好的描述。如果我知道如何轻松地将正方形的颜色放入更大的二维纹理中，那将会容易得多。

TL; DR：你如何将较小的纹理放入更大的纹理？

Answer 1

创建一个最大纹理大小的RenderTarget2D，并将其设置为活动状态。绘制大纹理然后绘制较小的纹理。将对原始纹理的引用设置为刚刚绘制的RenderTarget2D。

int texWidth = this._rWidth * Region.REGION_DIM * 16;
int texHeight = this._rHeight * Region.REGION_DIM * 16;

_renderTarget = new RenderTarget2D(GraphicsDevice, texWidth, texHeight);
GraphicsDevice.SetRenderTarget(_renderTarget);
GraphicsDevice.Clear(Color.Transparent);

_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque);

for (int blockX = 0; blockX < texWidth / 16; blockX++)
{
    for (int blockY = 0; blockY < texHeight / 16; blockY++)
    {
         _spriteBatch.Draw(
            TextureManager.GetTextureAtIndex(b.GetIndexBasedOnMetadata(b.GetMetadataForSurroundings(this, blockX, blockY)), b.GetTextureFile()), 
         new Rectangle(blockX * 16, blockY * 16, 16, 16), 
         Color.White);
     }
}

_spriteBatch.End()

GraphicsDevice.SetRenderTarget(null);
var picture = _renderTarget;

将较小的Texture2D放入较大的Texture2D中

1 个答案: