public void Draw(SpriteBatch spriteBatch, CameraViewport viewport, float layerDepth)
{
int tileWidth = tiles[0, 0].Width;
int tileHeight = tiles[0, 0].Height;
//calculate what tiles we must start drawing with
int tilex = (int)viewport.Position.X / tileWidth;
int tiley = (int)viewport.Position.Y / tileHeight;
if (viewport.Position.X < 0) tilex--;
if (viewport.Position.Y < 0) tiley--;
//calculate at wich position we must start drawing tiles
//Vector2 tileCursor = new Vector2(-viewport.ViewportPosition.X % tileWidth, -viewport.ViewportPosition.Y % tileHeight);
Vector2 tileCursor = new Vector2(tilex * tileWidth - viewport.Position.X, tiley * tileHeight - viewport.Position.Y);
//calculate how many tiles we must draw
int numx = (int)Math.Ceiling((viewport.Size.Width - tileCursor.X) / tileWidth);
int numy = (int)Math.Ceiling((viewport.Size.Height - tileCursor.Y) / tileHeight);
//draw sprites row-by-row
float startX = tileCursor.X;
for (int r = tiley; r < tiley + numy; r++)
{
if (r >= tileRows) break;
for (int c = tilex; c < tilex + numx; c++)
{
if (c >= tileCols) break;
if (c >= 0 && r >= 0)
spriteBatch.Draw(tiles[r, c], tileCursor, null, Color.White, 0f, Vector2.Zero, 1f, SpriteEffects.None, layerDepth);
tileCursor.X += tileWidth;
}
tileCursor.X = startX;
tileCursor.Y += tileHeight;
}
}
public abstract void Draw(SpriteBatch spriteBatch, CameraViewport viewport, float layerDepth);
public Camera(Vector2 position, Size viewSize)
{
this.viewport = new CameraViewport(viewSize);
}
public override void Draw(SpriteBatch spriteBatch, CameraViewport viewport, float layerDepth)
{
spriteBatch.Draw(spritesheet, tlPosition - viewport.Position, animation.GetFrame(),
Color.White, 0f, Vector2.Zero, 1f, SpriteEffects.None, layerDepth);
}