Pyramids

Issues

• Should have just 1 zoom level rendered when tile has vector data

BlueSpray Tiles

CMTile

Approach

• Loads Tiles as needed
  • Loads raster immeidately after a tile is loaded that contains a raster

Functions

• Private
  • GetPolygonCoordinates
  • GetDataForTextureTil
• Protected 3D Management
• HideMesh
• HideTiles
• SetupGeometry (overriden)
• Static Protected 3D Management
  • GetSubSample()
  • GetNewMaterial
  • GetDistanceTo3DView
• Protected
  • GetTileImageFilePath
  • GetOriginalTileWidth
  • GetOriginalTileExtent
  • GetGeographicTileExtent
  • GetGeoTileExtent
  • GetGeoTileWidth
• Protected Raster functions
  • HaveLoadedRasterData
  • NeedToLoadRasterData
  • LoadTileRaster
  • GetRaster
  • GetRasterRequest
  • PaintRaster
• Protected tile management
• LoadTile
• PaintChildTiles
• GetChildrenVisible
• GetNumChildTilesLoaded
• GetPaintThisTile
• GetBestTileToLoad
• PaintTile
• Protected
  • AddToFeatureBounds
  • In
  • MouseDown
• Public
  • SetPaintTileInfo
  • GetPaintTileInfo
  • SetData
  • GetData

OpenFormat Tiles

CMTileOpenFormat

The TileOpenFormat is based on the 256x256 original Google Mercator pixel-baed projection rather than WebMercator.

• Private
  • GetChildTile() - allocates new child tile
  • SetupGeometr
• Protected (overrides)
• GetTileImageFilePath
• GetOriginalTileExtent
• Protected (overrides)
• GetNumChildTilesLoaded
• GetChildrenVisible
• GetPaintThisTile
• GetBestTileToLoad
• PaintTile
• Public
  • GetData()

Implementation

• PaintTile()
  • 3D Rendering
  • 2D Rendering
    • CheckPaintTile()
      • 3D specific checks:
      • 2D Specific checks:
        • If this steps pixel width<256, PaintTile=true
        • else PaintChildren=true
      • If PaintTile==false
        • If this step is 0, PaintTile=true