public override void draw(Batcher batcher, Vector2 position, float layerDepth, RectangleF cameraClipBounds)
{
// offset render position by the layer offset, used for isometric layer depth
position += offset;
// offset it by the entity position since the tilemap will always expect positions in its own coordinate space
cameraClipBounds.location -= position;
if (tiledMap.requiresLargeTileCulling)
{
// we expand our cameraClipBounds by the excess tile width/height of the largest tiles to ensure we include tiles whose
// origin might be outside of the cameraClipBounds
cameraClipBounds.location -= new Vector2(
tiledMap.largestTileWidth,
tiledMap.largestTileHeight - tiledMap.tileHeight);
cameraClipBounds.size += new Vector2(
tiledMap.largestTileWidth,
tiledMap.largestTileHeight - tiledMap.tileHeight);
}
Point min, max;
min = new Point(0, 0);
max = new Point(tiledMap.width - 1, tiledMap.height - 1);
// loop through and draw all the non-culled tiles
for (var y = min.Y; y <= max.Y; y++)
{
for (var x = min.X; x <= max.X; x++)
{
var tile = getTile(x, y);
if (tile == null)
{
continue;
}
var tileworldpos = tiledMap.isometricTileToWorldPosition(x, y);
if (tileworldpos.X < cameraClipBounds.left || tileworldpos.Y < cameraClipBounds.top ||
tileworldpos.X > cameraClipBounds.right ||
tileworldpos.Y > cameraClipBounds.bottom)
{
continue;
}
var tileRegion = tile.textureRegion;
// culling for arbitrary size tiles if necessary
if (tiledMap.requiresLargeTileCulling)
{
// TODO: this only checks left and bottom. we should check top and right as well to deal with rotated, odd-sized tiles
if (tileworldpos.X + tileRegion.sourceRect.Width < cameraClipBounds.left ||
tileworldpos.Y - tileRegion.sourceRect.Height > cameraClipBounds.bottom)
{
continue;
}
}
drawTile(batcher, position, layerDepth, x, y, 1);
}
}
}
