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using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
namespace MonoGame.Extended.Tiled
{
public struct TiledMapTilesetTileAnimationFrame
{
public readonly int LocalTileIdentifier;
public readonly TimeSpan Duration;
public readonly Vector2[] TextureCoordinates;
private readonly Dictionary<TiledMapTileFlipFlags, Vector2[]> _flipDictionary = new Dictionary<TiledMapTileFlipFlags, Vector2[]>();
internal TiledMapTilesetTileAnimationFrame(TiledMapTileset tileset, int localTileIdentifier, int durationInMilliseconds)
{
LocalTileIdentifier = localTileIdentifier;
Duration = new TimeSpan(0, 0, 0, 0, durationInMilliseconds);
TextureCoordinates = new Vector2[4];
CreateTextureCoordinates(tileset);
}
public Vector2[] GetTextureCoordinates(TiledMapTileFlipFlags flipFlags)
{
if (!_flipDictionary.TryGetValue(flipFlags, out Vector2[] flippedTextureCoordiantes))
{
return TextureCoordinates;
}
else
{
return flippedTextureCoordiantes;
}
}
public void CreateTextureRotations(TiledMapTileset tileset, TiledMapTileFlipFlags flipFlags)
{
if (!_flipDictionary.ContainsKey(flipFlags))
{
if (flipFlags == TiledMapTileFlipFlags.None)
{
_flipDictionary.Add(flipFlags, TextureCoordinates);
}
else
{
_flipDictionary.Add(flipFlags, TransformTextureCoordinates(tileset, flipFlags));
}
}
}
public Vector2[] TransformTextureCoordinates(TiledMapTileset tileset, TiledMapTileFlipFlags flipFlags)
{
var sourceRectangle = tileset.GetTileRegion(LocalTileIdentifier);
var texture = tileset.Texture;
var texelLeft = (float)sourceRectangle.X / texture.Width;
var texelTop = (float)sourceRectangle.Y / texture.Height;
var texelRight = (sourceRectangle.X + sourceRectangle.Width) / (float)texture.Width;
var texelBottom = (sourceRectangle.Y + sourceRectangle.Height) / (float)texture.Height;
var flipDiagonally = (flipFlags & TiledMapTileFlipFlags.FlipDiagonally) != 0;
var flipHorizontally = (flipFlags & TiledMapTileFlipFlags.FlipHorizontally) != 0;
var flipVertically = (flipFlags & TiledMapTileFlipFlags.FlipVertically) != 0;
var transform = new Vector2[4];
transform[0].X = texelLeft;
transform[0].Y = texelTop;
transform[1].X = texelRight;
transform[1].Y = texelTop;
transform[2].X = texelLeft;
transform[2].Y = texelBottom;
transform[3].X = texelRight;
transform[3].Y = texelBottom;
if (flipDiagonally)
{
FloatHelper.Swap(ref transform[1].X, ref transform[2].X);
FloatHelper.Swap(ref transform[1].Y, ref transform[2].Y);
}
if (flipHorizontally)
{
if (flipDiagonally)
{
FloatHelper.Swap(ref transform[0].Y, ref transform[1].Y);
FloatHelper.Swap(ref transform[2].Y, ref transform[3].Y);
}
else
{
FloatHelper.Swap(ref transform[0].X, ref transform[1].X);
FloatHelper.Swap(ref transform[2].X, ref transform[3].X);
}
}
if (flipVertically)
{
if (flipDiagonally)
{
FloatHelper.Swap(ref transform[0].X, ref transform[2].X);
FloatHelper.Swap(ref transform[1].X, ref transform[3].X);
}
else
{
FloatHelper.Swap(ref transform[0].Y, ref transform[2].Y);
FloatHelper.Swap(ref transform[1].Y, ref transform[3].Y);
}
}
transform[0] = transform[0];
transform[1] = transform[1];
transform[2] = transform[2];
transform[3] = transform[3];
return transform;
}
private void CreateTextureCoordinates(TiledMapTileset tileset)
{
var sourceRectangle = tileset.GetTileRegion(LocalTileIdentifier);
var texture = tileset.Texture;
var texelLeft = (float)sourceRectangle.X / texture.Width;
var texelTop = (float)sourceRectangle.Y / texture.Height;
var texelRight = (sourceRectangle.X + sourceRectangle.Width) / (float)texture.Width;
var texelBottom = (sourceRectangle.Y + sourceRectangle.Height) / (float)texture.Height;
TextureCoordinates[0].X = texelLeft;
TextureCoordinates[0].Y = texelTop;
TextureCoordinates[1].X = texelRight;
TextureCoordinates[1].Y = texelTop;
TextureCoordinates[2].X = texelLeft;
TextureCoordinates[2].Y = texelBottom;
TextureCoordinates[3].X = texelRight;
TextureCoordinates[3].Y = texelBottom;
}
public override string ToString()
{
return $"{LocalTileIdentifier}:{Duration}";
}
}
}
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