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refactore: start work on download tiles
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@kfilippenok
kfilippenok committed Dec 18, 2024
1 parent 4173526 commit d2879ad
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Showing 2 changed files with 166 additions and 12 deletions.
169 changes: 158 additions & 11 deletions src/TilesManipulations/TilesManipulations.Core.pas
View file
Original file line number Diff line number Diff line change
Expand Up @@ -176,11 +176,27 @@ TLayers = class(_TLayers)
{ TTilesManipulator }

TTilesManipulator = class
const
MinLongitude = -180.0;
MaxLongitude = 180.0;
MinLatitude = -85.0511;
MaxLatitude = 85.0511;
strict private
FLayers: TLayers;
public
public // Calculations
class function CalcTileX(const AZoom: Byte; const ALongitude: Float): QWord; static;
class function CalcTileY(const AZoom: Byte; const ALatitude: Float): QWord; static;
class function CalcRowTilesCount(const AMinX, AMaxX: QWord): QWord; overload; static;
class function CalcColumnTilesCount(const AMinY, AMaxY: QWord): QWord; static;
class function CalcZoomTilesCount(const AZoom: Byte; const AMinLatitude, AMaxLatitude, AMinLongitude, AMaxLongitude: Float): QWord; static;
class function CalcTotalTilesCount(const AMinZoom, AMaxZoom: Byte; const AMinLatitude, AMaxLatitude, AMinLongitude, AMaxLongitude: Float): QWord; static;
public // Create and Destroy
constructor Create; virtual;
destructor Destroy; override;
public
procedure Download(const AMinZoom, AMaxZoom: Integer); virtual;
procedure Download(const AMinZoom, AMaxZoom: Integer; const AMinLatitude, AMaxLatitude, AMinLongtude, AMaxLongtude: Float); virtual; overload;
public
property Layers: TLayers read FLayers write FLayers;
end;

Expand Down Expand Up @@ -361,14 +377,16 @@ procedure TProviderClient.AutoSelectUserAgent(const AURL: String);
Complete: Boolean;
LException: Exception;
begin
Write('Setting up settings for connection... ');
Write('Setting up connection... ');

Complete := False;
for i := 0 to FUserAgents.Count-1 do
try
Self.AddHeader('User-Agent', FUserAgents[i]);
Self.Get(AURL);
Complete := True;
WriteLn('Ok');
Break;
except
on E: Exception do
begin
Expand All @@ -377,9 +395,9 @@ procedure TProviderClient.AutoSelectUserAgent(const AURL: String);
end;
end;

if Complete then
WriteLn('Ok')
else
WriteLn(FUserAgent);

if not Complete then
begin
WriteLn('Fail');
raise LException;
Expand Down Expand Up @@ -431,13 +449,14 @@ function TProviderClient.ReceiveTile(const AURL: String): TBGRABitmap;
continue;
end;
LMemoryStream.Position := 0;
Result.LoadFromStream(LMemoryStream);
Result := TBGRABitmap.Create(LMemoryStream);
LMemoryStream.Free;
except
on E: Exception do
begin
WriteLn(E.ClassName + ' ' + E.Message);
LMemoryStream.Free;
if Assigned(LMemoryStream) then FreeAndNil(LMemoryStream);
if Assigned(Result) then FreeAndNil(Result);
raise ETDReceive.Create('Failed receive file.');
end;
end;
Expand All @@ -462,7 +481,12 @@ destructor TProvider.Destroy;
function TProvider.GiveTile(AZoom: Integer; AX, AY: Integer): TBGRABitmap;
begin
Write(Name + ': ');
Result := FClient.ReceiveTile(Format('%s/%d/%d/%d.png',[URL, AZoom, AX, AY]));
Result := nil;
try
Result := FClient.ReceiveTile(Format('%s/%d/%d/%d.png',[URL, AZoom, AX, AY]));
except
raise;
end;
end;

{ TProviders }
Expand Down Expand Up @@ -503,14 +527,68 @@ function TLayers.Add(AProvider: IProvider; AFilter: IFilter): Integer;

procedure TLayers.Load(const AZoom: Integer; const AX, AY: Integer);
var
i: Integer;
Layer: TLayer;
begin
for i := 0 to Count-1 do
Items[i].Load(AZoom, AX, AY);
for Layer in Self do
Layer.Load(AZoom, AX, AY);
end;

{ TTilesManipulator }

class function TTilesManipulator.CalcTileX(const AZoom: Byte; const ALongitude: Float): QWord;
var
n: Float;
begin
n := Power(2, AZoom);
Result := Trunc(((ALongitude + 180) / 360) * n);
end;

class function TTilesManipulator.CalcTileY(const AZoom: Byte; const ALatitude: Float): QWord;
var
lat_rad, n, x1, x2, x3, x4, x5: Float;
begin
n := Power(2, AZoom);
lat_rad := DegToRad(ALatitude);
x1 := Tan(lat_rad);
x2 := ArcSinH(x1);
x3 := x2 / Pi;
x4 := (1 - x3);
x5 := x4 / 2.0;
Result := Trunc(x4 / 2.0 * n);
end;

class function TTilesManipulator.CalcRowTilesCount(const AMinX, AMaxX: QWord): QWord;
begin
Result := AMaxX - AMinX + 1;
end;

class function TTilesManipulator.CalcColumnTilesCount(const AMinY, AMaxY: QWord): QWord;
begin
Result := AMaxY - AMinY + 1;
end;

class function TTilesManipulator.CalcZoomTilesCount(const AZoom: Byte;
const AMinLatitude, AMaxLatitude, AMinLongitude, AMaxLongitude: Float): QWord;
var
MinX, MaxX, MinY, MaxY: QWord;
begin
MinX := CalcTileX(AZoom, AMinLongitude);
MaxX := CalcTileX(AZoom, AMaxLongitude);
MinY := CalcTileY(AZoom, AMinLatitude);
MaxY := CalcTileY(AZoom, AMaxLatitude);
Result := (MaxX - MinX) * (MaxY - MinY);
end;

class function TTilesManipulator.CalcTotalTilesCount(const AMinZoom, AMaxZoom: Byte;
const AMinLatitude, AMaxLatitude, AMinLongitude, AMaxLongitude: Float): QWord;
var
iz: Byte;
begin
Result := 0;
for iz := AMinZoom to AMaxZoom do
Result := Result + CalcZoomTilesCount(iz, AMinLatitude, AMaxLatitude, AMinLongitude, AMaxLongitude);
end;

constructor TTilesManipulator.Create;
begin
inherited Create;
Expand All @@ -525,6 +603,75 @@ destructor TTilesManipulator.Destroy;
FreeAndNil(FLayers);
end;

procedure TTilesManipulator.Download(const AMinZoom, AMaxZoom: Integer);
begin
Download(AMinZoom, AMaxZoom, MinLatitude, MaxLatitude, MinLongitude, MaxLongitude);
end;

procedure TTilesManipulator.Download(const AMinZoom, AMaxZoom: Integer; const AMinLatitude, AMaxLatitude, AMinLongtude, AMaxLongtude: Float);
var
MinX, MaxX, MinY, MaxY: QWord;
iz: Byte;
ix, iy: Longword;
LZoomCurrentCount, LZoomTotalCount, LCurrentCount, LTotalCount: QWord;
begin
LCurrentCount := 0;

LTotalCount := CalcTotalTilesCount(AMinZoom, AMaxZoom, AMinLatitude, AMaxLatitude, AMinLongtude, AMaxLongtude);
WriteLn(LTotalCount);

//for iz := MinZoom to MaxZoom do
//begin
// if SaveMethod = smFolders then
// if not DirectoryExists(Format('%s/%d', [OutPath, iz])) then
// if not ForceDirectories(Format('%s/%d', [OutPath, iz])) then
// raise Exception.Create('The necessary paths could not be created. Check the specified path');
//
// CalcTileNumber(Coordinates[0], iz, LTile1);
// CalcTileNumber(Coordinates[1], iz, LTile2);
// {$IFDEF DEBUG}
// WriteLn(Format('Coordinates[0]: %f, %f, Zoom: %d -> Tile: %d, %d', [Coordinates[0].lat, Coordinates[0].lon, iz, LTile1.x, LTile1.y]));
// WriteLn(Format('Coordinates[1]: %f, %f, Zoom: %d -> Tile: %d, %d', [Coordinates[1].lat, Coordinates[1].lon, iz, LTile2.x, LTile2.y]));
// {$ENDIF}
//
// LZoomCurrentCount := 0;
// LZoomTotalCount := CalcZoomTilesCount(LTile1, Ltile2);
//
// for ix := LTile1.X to LTile2.x do
// begin
// if SaveMethod = smFolders then
// if not DirectoryExists(Format('%s/%d/%d', [OutPath, iz, ix])) then
// ForceDirectories(Format('%s/%d/%d', [OutPath, iz, ix]));
//
// for iy := LTile1.y to LTile2.y do
// begin
// LTileTmp.x := ix;
// LTileTmp.y := iy;
// try
// DownloadTile(iz, LTileTmp);
// Inc(LZoomCurrentCount);
// Inc(LCurrentCount);
// WriteLn(Format('Total: %d/%d <- (Zoom %d: %d/%d)', [LCurrentCount, LTotalCount, iz, LZoomCurrentCount, LZoomTotalCount]));
// except
// on E: ETileDownload do
// begin
// if SkipMissing and (E is ETDReceive) then
// begin
// WriteLn('! Skip missing tile');
// Continue;
// end;
//
// WriteLn;
// WriteLn('Error: ', E.Message);
// Exit;
// end;
// end;
// end;
// end;
//
//end;
end;

operator = (const First, Second: RCoordinate) R : boolean;
begin
R := SameValue(First.lat, Second.lat) and SameValue(First.lon, Second.lon);
Expand Down
9 changes: 8 additions & 1 deletion src/tilesdownloader.lpr
View file
Original file line number Diff line number Diff line change
Expand Up @@ -63,7 +63,14 @@ ATilesDownloader = class(TCustomApplication)
begin
TilesManipulator := TTilesManipulator.Create;
TilesManipulator.Layers.Add(Providers['osm-standard'], TFilterGrayscale.Create);
TilesManipulator.Layers[0].Load(0, 0, 0);
//TilesManipulator.Layers.Load(0, 0, 0);
//TilesManipulator.Download(1, 1);

WriteLn(TilesManipulator.CalcTileX(0, 180));
WriteLn(TilesManipulator.CalcTileY(0, -85.0511));

//ProviderClient := TProviderClient.Create(nil);
//ProviderClient.;

TilesManipulator.Free;

Expand Down

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