public int GetZoom(TileObserverViewport viewport)
{
var zoom = _currentZoom[viewport];
var viewportSize = Mathf.Max(viewport.Size.x, viewport.Size.y);
var viewportPixelSize = Mathf.Max(viewport.PixelWidth, viewport.PixelHeight) / viewport.PixelScale;
while (true)
{
var tilesPerViewport = viewportPixelSize / TileSize;
var zoomValue = (viewportSize / tilesPerViewport) / TileInfo.GetTileWidth(TileSize, zoom);
if (zoomValue < ZoomThreshold)
{
zoom++;
}
else if (zoomValue > 2 * ZoomThreshold && zoom > 0)
{
zoom--;
}
else
{
break;
}
}
return(zoom);
}
public void CheckZoom(TileObserverViewport viewport)
{
if (viewport.Size.x == 0 || viewport.Size.y == 0)
{
return;
}
var newZoom = GetZoom(viewport);
if (newZoom != _currentZoom[viewport])
{
RemoveTiles(_visibleTiles.Where(tile => tile.Zoom > newZoom));
_currentZoom[viewport] = newZoom;
}
}
public void CheckViewport(TileObserverViewport viewport)
{
if (viewport.Size.x == 0 || viewport.Size.y == 0)
{
return;
}
var zoom = _currentZoom[viewport];
var(xMin, yMin) = TileInfo.PosToMesh(viewport.Position - viewport.Size / 2, TileSize, zoom);
var(xMax, yMax) = TileInfo.PosToMesh(viewport.Position + viewport.Size / 2, TileSize, zoom);
if (xMin > xMax)
{
(xMin, xMax) = (xMax, xMin);
}
if (yMin > yMax)
{
(yMin, yMax) = (yMax, yMin);
}
var cols = GetCols(zoom);
var rows = GetRows(zoom);
if (!viewport.Repeat)
{
xMin = Mathf.Clamp(xMin, 0, cols - 1);
xMax = Mathf.Clamp(xMax, 0, cols - 1);
yMin = Mathf.Clamp(yMin, 0, rows - 1);
yMax = Mathf.Clamp(yMax, 0, rows - 1);
}
var newTiles = new List <TileInfo>();
for (var row = yMin; row <= yMax; row++)
{
for (var col = xMin; col <= xMax; col++)
{
newTiles.Add(new TileInfo((row + rows) % rows, (col + cols) % cols, TileSize, zoom));
}
}
RemoveTiles(_visibleTiles.Except(newTiles).Where(tile => tile.Zoom == zoom));
AddTiles(newTiles);
}
public void AddViewport(TileObserverViewport viewport)
{
_viewports.Add(viewport);
_currentZoom.Add(viewport, 0);
viewport.OnViewportUpdated += ViewportOnOnViewportUpdated;
}
