public void AddLayer(int id, Layer layer)
{
if (_layers.Length < id + 1)
{
Array.Resize(ref _layers, id + 1);
}
_layers[id] = layer;
}
public void Draw(GameTime gameTime, SpriteBatch spriteBatch, Camera camera, Layer layer)
{
// Calculate the first visible cell index.
float cameraCellX = (int)camera.Position.X / 16;
float cameraCellY = (int)camera.Position.Y / 16;
var firstIndex = (int)cameraCellX + (_size.Width * (int)cameraCellY);
// Calculate stuff that we will need later.
var horizontalCells = camera.ScreenSize.Width / 16;
var verticalCells = camera.ScreenSize.Height / 16;
var mapCellCount = _size.Width * _size.Height;
for (var y = 0; y < verticalCells + 1; y++)
{
// How much should we increment the index position with?
var verticalIncrement = y * _size.Width;
for (var x = 0; x < horizontalCells + 1; x++)
{
var index = firstIndex + verticalIncrement + x;
if (index < 0)
{
continue;
}
if (index >= mapCellCount)
{
return;
}
if (layer.Tiles[index] != null)
{
var tx = index % _size.Width * 16;
var ty = index / _size.Width * 16;
var position = new Vector2(tx, ty);
position = camera.Transform(position);
// Get the source rectangle and the texture.
var sourceRectangle = layer.Tiles[index].GetRectangle();
var texture = layer.Tiles[index].Tileset.Texture;
// Draw the tile.
spriteBatch.Draw(texture, position, sourceRectangle, layer.Color);
}
}
}
}