49 lines
1.7 KiB
C#
49 lines
1.7 KiB
C#
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using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.PixelFormats;
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namespace TanksServer.Graphics;
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internal sealed class SpriteSheet(Sprite[,] sprites)
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{
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public static SpriteSheet FromImageFile(string filePath, int spriteWidth, int spriteHeight)
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{
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using var image = Image.Load<Rgba32>(filePath);
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var spritesPerRow = image.Width / spriteWidth;
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if (image.Width % spriteWidth != 0)
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throw new InvalidOperationException("invalid sprite dimensions");
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var spritesPerColumn = image.Height / spriteHeight;
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if (image.Height % spriteHeight != 0)
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throw new InvalidOperationException("invalid sprite dimensions");
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var sprites = new Sprite[spritesPerRow, spritesPerColumn];
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var whitePixel = new Rgba32(byte.MaxValue, byte.MaxValue, byte.MaxValue, byte.MaxValue);
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for (var spriteY = 0; spriteY < spritesPerColumn; spriteY++)
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for (var spriteX = 0; spriteX < spritesPerRow; spriteX++)
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{
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var data = new bool?[spriteWidth, spriteHeight];
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for (var dy = 0; dy < spriteHeight; dy++)
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for (var dx = 0; dx < spriteWidth; dx++)
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{
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var x = spriteX * spriteWidth + dx;
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var y = spriteY * spriteHeight + dy;
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var pixelValue = image[x, y];
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data[dx, dy] = pixelValue.A == 0
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? null
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: pixelValue == whitePixel;
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}
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sprites[spriteX, spriteY] = new Sprite(data);
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}
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return new SpriteSheet(sprites);
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}
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public Sprite this[int x, int y] => sprites[x, y];
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public Sprite this[int index] => sprites[index % sprites.GetLength(1), index / sprites.GetLength(1)];
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}
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