private void renderMap()
{
//calculating viewport
PointF centerTile = TileCoordinatesConverter.GetTileIndex(Zoom, CenterCoord);
SizeF viewportSizeInTiles = new SizeF((float)Size.Width / (float)tileManager.TileSize.Width, (float)Size.Height / (float)tileManager.TileSize.Height);
topLeftTile = new PointF(centerTile.X - viewportSizeInTiles.Width / 2.0f, centerTile.Y - viewportSizeInTiles.Height / 2.0f);
bottomRightTile = new PointF(centerTile.X + viewportSizeInTiles.Width / 2.0f, centerTile.Y + viewportSizeInTiles.Height / 2.0f);
//generate bitmap with tiles
bitmap = new Bitmap(Size.Width, Size.Height);
Graphics g = Graphics.FromImage(bitmap);
for (int x = roundDownCoordinates(topLeftTile).X; x <= roundDownCoordinates(bottomRightTile).X; x++)
{
for (int y = roundDownCoordinates(topLeftTile).Y; y <= roundDownCoordinates(bottomRightTile).Y; y++)
{
Tile tile = tileManager.GetTile(zoom, x, y);
if (tile != null)
{
g.DrawImageUnscaled(tile.Picture, getLocationForTileIndex(tile.X, tile.Y));
}
}
}
//render overlay items
foreach (OverlayItem item in overlayItems)
{
if (item.Icon != null)
{
ImageAttributes attr = new ImageAttributes();
attr.SetColorKey(item.Transparent, item.Transparent);
Point loc = getLocationForCoordinates(item.Coord);
loc.X -= item.Offset.X;
loc.Y -= item.Offset.Y;
Rectangle destRect = new Rectangle(loc, item.Icon.Size);
g.DrawImage(item.Icon, destRect, 0, 0, item.Icon.Size.Width, item.Icon.Size.Height, GraphicsUnit.Pixel, attr);
}
}
//render polygons
foreach (PointF[] pointArray in polygonItems)
{
List <Point> locArray = new List <Point>();
foreach (PointF p in pointArray)
{
locArray.Add(getLocationForCoordinates(p));
}
g.DrawPolygon(polygonPen, locArray.ToArray());
}
g.Dispose();
this.Invalidate();
displayedAreaChanged(TopLeftDisplay, BottomRightDisplay, Zoom);
}
private Point getLocationForCoordinates(PointF coord)
{
PointF tileIndex = TileCoordinatesConverter.GetTileIndex(Zoom, coord);
return(getLocationForTileIndex(tileIndex.X, tileIndex.Y));
}
