/// <summary>
/// Draw the level
/// </summary>
/// <param name="elapsedTime">The time between this and the last frame</param>
public void Draw(float elapsedTime)
{
if (Paused)
{
// TODO: Draw "Paused" Overlay
}
// Draw level
Viewport viewport = game.GraphicsDevice.Viewport;
basicEffect.World = Matrix.CreateScale(2, 2, 1);
basicEffect.View = Matrix.CreateTranslation(new Vector3(0, scrollDistance, 0));
basicEffect.Projection = Matrix.CreateOrthographicOffCenter(0, viewport.Width, viewport.Height, 0, 0, -1);
spriteBatch.Begin(0, null, SamplerState.LinearClamp, null, null, basicEffect);
for (int i = 0; i < CurrentMap.LayerCount; i++)
{
// To minimize drawn tiles, we limit ourselves to those onscreen
int miny = (int)((-scrollDistance - 2 * CurrentMap.Layers[i].ScrollOffset) /
(CurrentMap.TileHeight * 2));
int maxy = miny + 15;
// And those that exist
if (miny < 0)
{
miny = 0;
}
if (maxy > CurrentMap.Height)
{
maxy = CurrentMap.Height;
}
for (int y = miny; y < maxy; y++)
{
// Since our maps are only as wide as our rendering area,
// no need for optimizaiton here
for (int x = 0; x < CurrentMap.Width; x++)
{
int index = x + y * CurrentMap.Width;
TileData tileData = CurrentMap.Layers[i].TileData[index];
if (tileData.TileID != 0)
{
Tile tile = CurrentMap.Tiles[tileData.TileID - 1];
Rectangle onScreen = new Rectangle(
x * CurrentMap.TileWidth,
(int)(y * CurrentMap.TileHeight + CurrentMap.Layers[i].ScrollOffset),
CurrentMap.TileWidth,
CurrentMap.TileHeight);
spriteBatch.Draw(CurrentMap.Textures[tile.TextureID], onScreen, tile.Source, Color.White, 0f, new Vector2(CurrentMap.TileWidth / 2, CurrentMap.TileHeight / 2), tileData.SpriteEffects, CurrentMap.Layers[i].LayerDepth);
}
}
}
}
// Draw only the game objects that appear within our scrolling region
Rectangle bounds = new Rectangle(0,
(int)(-scrollDistance / 2),
CurrentMap.Width * CurrentMap.TileWidth,
16 * CurrentMap.TileHeight);
foreach (uint goID in ScrollingShooterGame.GameObjectManager.QueryRegion(bounds))
{
GameObject go = ScrollingShooterGame.GameObjectManager.GetObject(goID);
go.Draw(elapsedTime, spriteBatch);
}
spriteBatch.End();
}
