private void DownloadMap(MapType mapType, double longitude, double latitude, double zoom)
{
// Calculate map params
m_MapType = mapType;
m_Longitude = longitude;
m_Latitude = latitude;
m_Zoom = zoom;
m_ptMapCenter = GoogleMapsNet.LatLongToPixel(latitude, longitude, zoom);
m_rcViewport = new Rectangle(m_ptMapCenter.X - this.ClientRectangle.Width / 2, m_ptMapCenter.Y - this.ClientRectangle.Height / 2, this.ClientRectangle.Width, this.ClientRectangle.Height);
Point pt1 = GoogleMapsNet.LatLongToPixel(latitude, longitude, zoom);
Point pt2 = GoogleMapsNet.LatLongToPixel(latitude + 1, longitude + 1, zoom);
if ((pt2.X - pt1.X) == 0)
{
m_LongitudeKoef = 0.0;
}
else
{
m_LongitudeKoef = Math.Abs(1.0 / (pt2.X - pt1.X));
}
if ((pt2.Y - pt1.Y) == 0)
{
m_LatitudeKoef = 0.0;
}
else
{
m_LatitudeKoef = Math.Abs(1.0 / (pt2.Y - pt1.Y));
}
int startx = m_rcViewport.Left / 256;
int endx = m_rcViewport.Right / 256;
int starty = m_rcViewport.Top / 256;
int endy = m_rcViewport.Bottom / 256;
m_rcTileBounds = new Rectangle(startx, starty, endx - startx, endy - starty);
m_rcWorld = new Rectangle(m_rcTileBounds.Left * 256, m_rcTileBounds.Top * 256, (m_rcTileBounds.Right - m_rcTileBounds.Left + 1) * 256, (m_rcTileBounds.Bottom - m_rcTileBounds.Top + 1) * 256);
// Download map tiles
m_bDownload = true;
int serverId = 0;
for (int y = starty; y <= endy; y++)
{
for (int x = startx; x <= endx; x++)
{
// Add new download info
DownloadInfo di = new DownloadInfo();
di.serverId = serverId;
di.url = BuildURL(mapType, serverId);
di.x = x;
di.y = y;
di.z = Convert.ToInt32(zoom);
di.bComplete = false;
di.time = DateTime.Now;
m_DownloadQue.Add(di);
serverId = (serverId + 1) % 4;
}
}
}
private void UpdateMap()
{
// Update viewport
Size szOffset = new Size(m_ptEnd.X - m_ptStart.X, m_ptEnd.Y - m_ptStart.Y);
m_rcViewport.Offset(-szOffset.Width, -szOffset.Height);
// Update longitude and latitude
m_Longitude += (-szOffset.Width * m_LongitudeKoef);
m_Latitude += (szOffset.Height * m_LatitudeKoef);
// Remove invisible tiles
ArrayList tiles = new ArrayList();
foreach (GoogleMapsTile tile in m_Tiles)
{
if (tile.IsVisible(m_rcViewport) == true)
{
tiles.Add(tile);
}
else
{
tile.Dispose();
}
}
m_Tiles.Clear();
m_Tiles = new ArrayList(tiles.ToArray());
// Download new tiles
int startx2 = m_rcViewport.Left / 256;
int endx2 = m_rcViewport.Right / 256;
int starty2 = m_rcViewport.Top / 256;
int endy2 = m_rcViewport.Bottom / 256;
m_rcTileBounds = new Rectangle(startx2, starty2, endx2 - startx2 + 1, endy2 - starty2 + 1);
m_rcWorld = new Rectangle(m_rcTileBounds.Left * 256, m_rcTileBounds.Top * 256, (m_rcTileBounds.Right - m_rcTileBounds.Left + 1) * 256, (m_rcTileBounds.Bottom - m_rcTileBounds.Top + 1) * 256);
int serverId = 0;
for (int y = starty2; y <= endy2; y++)
{
for (int x = startx2; x <= endx2; x++)
{
bool bExists = false;
foreach (GoogleMapsTile tile in m_Tiles)
{
if (tile.Match(x, y) == true)
{
bExists = true;
break;
}
}
foreach (DownloadInfo di in m_DownloadQue)
{
if ((di.x == x) && (di.y == y))
{
bExists = true;
break;
}
}
if (bExists == false)
{
// Add new download info
DownloadInfo di = new DownloadInfo();
di.serverId = serverId;
di.url = BuildURL(m_MapType, serverId);
di.x = x;
di.y = y;
di.z = Convert.ToInt32(m_Zoom);
di.bComplete = false;
di.time = DateTime.Now;
m_DownloadQue.Add(di);
serverId = (serverId + 1) % 4;
}
}
}
// Update screen
UpdateScreen();
}