getTileBounds method
Implementation
Envelope getTileBounds(int xTile, int yTile) {
double minX = tileSetMinX + deltaX * xTile;
double maxX = minX + deltaX;
double maxY = tileSetMaxY - deltaY * yTile;
double minY = maxY - deltaY;
return Envelope(minX, maxX, minY, maxY);
}