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kcMapViewer.pas
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{ Map Viewer
Copyright (C) 2011 Maciej Kaczkowski / keit.co
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
}
unit kcMapViewer;
{$mode objfpc}{$H+}
interface
uses
SysUtils, Classes, Controls, Graphics, kcThreadPool;
type
TMapViewer = class;
TMapSource = (msNone, msGoogleNormal, msGoogleSatellite, msGoogleHybrid,
msGooglePhysical, msGooglePhysicalHybrid, msOpenStreetMapMapnik,
msOpenStreetMapOsmarender, msOpenCycleMap, msVirtualEarthBing,
msVirtualEarthRoad, msVirtualEarthAerial, msVirtualEarthHybrid,
msYahooNormal, msYahooSatellite, msYahooHybrid,
msOviNormal, msOviSatellite, msOviHybrid, msOviPhysical);
{ TArea }
TArea = record
top, left, bottom, right: Int64;
end;
TRealArea = record
top, left, bottom, right: Extended;
end;
TIntPoint = record
X, Y: Int64;
end;
TRealPoint = record
X, Y: Extended;
end;
{ TCustomDownloadEngine }
TOnBeforeDownloadEvent = procedure(Url: string; str: TStream; var CanHandle: Boolean) of object;
TOnAfterDownloadEvent = procedure(Url: string; str: TStream) of object;
TCustomDownloadEngine = class(TComponent)
private
FOnAfterDownload: TOnAfterDownloadEvent;
FOnBeforeDownload: TOnBeforeDownloadEvent;
protected
procedure DoDownloadFile(const Url: string; str: TStream); virtual;
public
constructor Create(AOwner: TComponent); override;
procedure DownloadFile(const Url: string; str: TStream); virtual;
published
property OnBeforeDownload: TOnBeforeDownloadEvent read FOnBeforeDownload
write FOnBeforeDownload;
property OnAfterDownload: TOnAfterDownloadEvent read FOnAfterDownload
write FOnAfterDownload;
end;
{ TCustomGeolocationEngine }
TCustomGeolocationEngine = class(TComponent)
protected
FDownloadEngine: TCustomDownloadEngine;
function DoSearch: TRealPoint; virtual;
public
procedure Search(AParent: TMapViewer);
end;
{ TMapViewer }
TMapViewer = class(TCustomControl)
private
FAutoZoom: Boolean;
FCache: TStrings;
FCacheSize: Word;
FDoubleBuffering: Boolean;
FDownloadEngine: TCustomDownloadEngine;
FGeolocationEngine: TCustomGeolocationEngine;
FMouseDown: Boolean;
FUseThreads: Boolean;
FUpdating: Boolean;
FX: Int64;
FY: Int64;
FOffsetX: Int64;
FOffsetY: Int64;
FMaxX: Int64;
FMaxY: Int64;
FBitmap: TBitmap;
FOldArea: TArea;
FVisibleArea: TArea;
FZoom: Byte;
FDebug: Boolean;
FSource: TMapSource;
FPool: TThreadPool;
procedure DownloadFile(const Url: string; str: TStream);
function GetCacheCount: Word;
procedure PaintRectangle(AX, AY, X, Y, Z: Int64);
procedure RepaintMap(X, Y: Integer; Cached: Boolean = False);
procedure RepaintMap(Cached: Boolean);
procedure SetAutoZoom(const AValue: Boolean);
procedure SetCacheSize(const AValue: Word);
procedure SetCenterLongLat(const AValue: TRealPoint);
procedure SetDownloadEngine(const AValue: TCustomDownloadEngine);
procedure SetZoom(const Value: Byte);
procedure SetDebug(const Value: Boolean);
procedure DownloadTile(X, Y, Z: Integer; Graphic: TBitmap);
procedure SetSource(const Value: TMapSource);
procedure AddToCache(url: string; stream: TStream); overload;
procedure AddToCache(source: TMapSource; X, Y, Z: Int64; stream: TStream); overload;
function GetFromCache(url: string; stream: TStream): Boolean; overload;
function GetFromCache(source: TMapSource; X, Y, Z: Int64; bitmap: TBitmap): Boolean; overload;
procedure ClearCache;
protected
function GetLongLat(X, Y, Z: Integer): TRealArea;
function GetPixelXY(X, Y, Z: Integer): TArea;
procedure MouseDown(Button: TMouseButton; Shift:TShiftState; X,Y:Integer); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X: Integer; Y: Integer); override;
procedure MouseMove(Shift: TShiftState; X: Integer; Y: Integer); override;
procedure DblClick; override;
procedure DoOnResize; override;
procedure Paint; override;
function GetCenterLongLat: TRealPoint;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure BeginUpdate;
procedure EndUpdate;
function GetMouseMapTile(X, Y: Integer): TIntPoint;
function GetMouseMapPixel(X, Y: Integer): TIntPoint;
function GetMouseMapLongLat(X, Y: Integer): TRealPoint;
procedure Geolocate;
procedure Center;
property CenterLongLat: TRealPoint read GetCenterLongLat write SetCenterLongLat;
property CacheCount: Word read GetCacheCount;
published
property AutoZoom: Boolean read FAutoZoom write SetAutoZoom;
property Zoom: Byte read FZoom write SetZoom;
property Debug: Boolean read FDebug write SetDebug;
property Source: TMapSource read FSource write SetSource default msGoogleNormal;
property CacheSize: Word read FCacheSize write SetCacheSize default 100;
property UseThreads: Boolean read FUseThreads write FUseThreads;
property DownloadEngine: TCustomDownloadEngine read FDownloadEngine write SetDownloadEngine;
property GeolocationEngine: TCustomGeolocationEngine read FGeolocationEngine write FGeolocationEngine;
property DoubleBuffering: Boolean read FDoubleBuffering write FDoubleBuffering;
property Align;
property OnMouseDown;
property OnMouseMove;
property OnMouseUp;
property OnClick;
property OnDblClick;
end;
implementation
uses
Math;
const
TILE_SIZE = 256;
EARTH_RADIUS = 6378137;
MIN_LATITUDE = -85.05112878;
MAX_LATITUDE = 85.05112878;
MIN_LONGITUDE = -180;
MAX_LONGITUDE = 180;
type
{ TTileJob }
TTileJob = class(TJob)
private
FAX: Integer;
FAY: Integer;
FBitmap: TBitmap;
FOwner: TMapViewer;
FX: Integer;
FY: Integer;
public
procedure Execute; override;
property Bitmap: TBitmap read FBitmap write FBitmap;
property X: Integer read FX write FX;
property Y: Integer read FY write FY;
property AX: Integer read FAX write FAX;
property AY: Integer read FAY write FAY;
property Owner: TMapViewer read FOwner write FOwner;
end;
procedure CopyArea(_from: TArea; var _to: TArea);
begin
_to.left := _from.left;
_to.bottom := _from.bottom;
_to.top := _from.top;
_to.right := _from.right;
end;
function QuadKey(X, Y, Z: Integer): string;
var
i, d, m: Longword;
begin
{
Bing Maps Tile System
http://msdn.microsoft.com/en-us/library/bb259689.aspx
}
Result := '';
for i := Z downto 1 do
begin
d := 0;
m := 1 shl (i - 1);
if (x and m) <> 0 then
Inc(d, 1);
if (y and m) <> 0 then
Inc(d, 2);
Result := Result + IntToStr(d);
end;
end;
function IntPower(X: Int64): Int64; inline;
begin
Result := 1 shl X;
end;
function IsValidPNG(stream: TStream): Boolean;
var
s: string;
y: Int64;
begin
if Assigned(stream) then
begin
SetLength(s, 3);
y := stream.Position;
stream.Position := 1;
stream.Read(s[1], 3);
stream.Position := y;
Result := s = 'PNG';
end
else
Result := False;
end;
function IsValidJPEG(stream: TStream): Boolean;
var
s: string;
y: Int64;
begin
if Assigned(stream) then
begin
SetLength(s, 4);
y := stream.Position;
stream.Position := 6;
stream.Read(s[1], 4);
stream.Position := y;
Result := (s = 'JFIF') or (s = 'Exif');
end
else
Result := False;
end;
{ TCustomGeolocationEngine }
function TCustomGeolocationEngine.DoSearch: TRealPoint;
begin
Result.X := 0;
Result.Y := 0;
end;
procedure TCustomGeolocationEngine.Search(AParent: TMapViewer);
var
r: TRealPoint;
begin
FDownloadEngine := AParent.DownloadEngine;
r := DoSearch;
AParent.BeginUpdate;
AParent.CenterLongLat := r;
AParent.EndUpdate;
end;
{ TCustomDownloadEngine }
procedure TCustomDownloadEngine.DoDownloadFile(const Url: string; str: TStream
);
begin
end;
constructor TCustomDownloadEngine.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
end;
procedure TCustomDownloadEngine.DownloadFile(const Url: string; str: TStream);
var
ACanHandle: Boolean;
begin
if Assigned(FOnBeforeDownload) then
FOnBeforeDownload(Url, str, ACanHandle)
else
ACanHandle := False;
if not ACanHandle then
DoDownloadFile(Url, str);
if Assigned(FOnAfterDownload) then
FOnAfterDownload(Url, str);
str.Position := 0;
end;
{ TTileJob }
procedure TTileJob.Execute;
begin
inherited Execute;
Owner.PaintRectangle(AX, AY, X, Y, Owner.Zoom);
end;
{ TMapViewer }
procedure TMapViewer.AddToCache(url: string; stream: TStream);
var
st: TStream;
o: TObject;
i: Integer;
begin
st := TMemoryStream.Create;
stream.Position := 0;
st.CopyFrom(stream, stream.Size);
FCache.InsertObject(0, url, st);
if FCache.Count - 1 >= FCacheSize then
begin
for i := FCache.Count - 1 downto FCacheSize do
begin
o := TObject(FCache.Objects[i]);
o.Free;
FCache.Delete(i);
end;
end;
end;
procedure TMapViewer.DownloadFile(const Url: string; str: TStream);
begin
if Assigned(FDownloadEngine) then
FDownloadEngine.DownloadFile(Url, str);
end;
procedure TMapViewer.AddToCache(source: TMapSource; X, Y, Z: Int64;
stream: TStream);
begin
AddToCache(Format('/%d-%d-%d-%d', [Integer(Source), X, Y, Z]), stream);
end;
function TMapViewer.GetFromCache(url: string; stream: TStream): Boolean;
var
i: Integer;
st: TStream;
begin
i := FCache.IndexOf(url);
Result := i > -1;
if Result then
begin
st := TStream(FCache.Objects[i]);
st.Position := 0;
stream.CopyFrom(st, st.Size);
stream.Position := 0;
end;
end;
function TMapViewer.GetFromCache(source: TMapSource; X, Y, Z: Int64;
bitmap: TBitmap): Boolean;
var
s: string;
st: TStream;
i: Integer;
begin
s := Format('/%d-%d-%d-%d', [Integer(source), X, Y, Z]);
i := FCache.IndexOf(s);
Result := i > -1;
if Result then
begin
st := TStream(FCache.Objects[i]);
st.Position := 0;
bitmap.LoadFromStream(st);
end;
end;
procedure TMapViewer.ClearCache;
var
i: Integer;
x: TObject;
begin
for i := 0 to FCache.Count - 1 do
begin
x := FCache.Objects[i];
x.Free;
end;
FCache.Clear;
end;
function TMapViewer.GetLongLat(X, Y, Z: Integer): TRealArea;
var
n: Extended;
begin
{
http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
== lon/lat to tile numbers ==
n = 2 ^ zoom
xtile = ((lon_deg + 180) / 360) * n
ytile = (1 - (log(tan(lat_rad) + sec(lat_rad)) / π)) / 2 * n
== tile numbers to lon/lat ==
n = 2 ^ zoom
lon_deg = xtile / n * 360.0 - 180.0
lat_rad = arctan(sinh(π * (1 - 2 * ytile / n)))
lat_deg = lat_rad * 180.0 / π
}
n := IntPower(zoom);
Result.left := x / n * 360.0 - 180.0;
Result.right := Result.left + (360.0 / n);
Result.top := radtodeg(arctan(sinh(PI * (1 - 2 * Y / n))));
Result.bottom := radtodeg(arctan(sinh(PI * (1 - 2 * (Y+1) / n))));
end;
function TMapViewer.GetPixelXY(X, Y, Z: Integer): TArea;
begin
Result.left := X * TILE_SIZE;
Result.right := (X + 1) * TILE_SIZE - 1;
Result.top := Y * TILE_SIZE;
Result.bottom := (Y + 1) * TILE_SIZE - 1;
end;
procedure TMapViewer.MouseDown(Button: TMouseButton; Shift: TShiftState; X,
Y: Integer);
begin
inherited MouseDown(Button, Shift, X, Y);
FMouseDown := True;
FOffsetX := X;
FOffsetY := Y;
end;
constructor TMapViewer.Create(AOwner: TComponent);
begin
inherited;
FUseThreads := False;
FPool := TThreadPool.Create;
FBitmap := TBitmap.Create;
FCache := TStringList.Create;
FSource := msGoogleNormal;
Height := TILE_SIZE;
Width := TILE_SIZE;
FCacheSize := 100;
FX := 0;
FY := 0;
FZoom := 0;
FAutoZoom := True;
end;
destructor TMapViewer.Destroy;
begin
FPool.Terminate;
ClearCache;
FBitmap.Free;
FCache.Free;
FPool.Free;
inherited;
end;
procedure TMapViewer.BeginUpdate;
begin
FUpdating := True;
end;
procedure TMapViewer.EndUpdate;
begin
FUpdating := False;
RepaintMap(False);
end;
function TMapViewer.GetMouseMapTile(X, Y: Integer): TIntPoint;
var
z: Int64;
begin
z := IntPower(FZoom) - 1;
Result := GetMouseMapPixel(X, Y);
Result.X := Result.X div TILE_SIZE;
Result.Y := Result.Y div TILE_SIZE;
if Result.X > z then
Result.X := z
else
if Result.X < 0 then
Result.X := 0;
if Result.Y > z then
Result.Y := z
else
if Result.Y < 0 then
Result.Y := 0;
end;
function TMapViewer.GetMouseMapPixel(X, Y: Integer): TIntPoint;
var
i: Int64;
begin
i := IntPower(FZoom) * TILE_SIZE;
Result.X := X - FX;
Result.Y := Y - FY;
if Result.X < 0 then
Result.X := 0
else
if Result.X > i then
Result.X := i;
if Result.Y < 0 then
Result.Y := 0
else
if Result.Y > i then
Result.Y := i;
end;
function TMapViewer.GetMouseMapLongLat(X, Y: Integer): TRealPoint;
var
i: TIntPoint;
tiles: Int64;
circumference: Int64;
lat: Extended;
shift: Extended;
res: Extended;
begin
i := GetMouseMapPixel(X, Y);
tiles := IntPower(FZoom);
circumference := tiles * TILE_SIZE;
Result.X := ((i.X * 360.0) / circumference) - 180.0;
res := (2 * pi * EARTH_RADIUS) / circumference;
shift := 2 * pi * EARTH_RADIUS / 2.0;
lat := ((i.Y * res - shift) / shift) * 180.0;
lat := radtodeg (2 * arctan( exp( lat * pi / 180.0)) - pi / 2.0);
Result.Y := -lat;
if Result.Y > MAX_LATITUDE then
Result.Y := MAX_LATITUDE
else
if Result.Y < MIN_LATITUDE then
Result.Y := MIN_LATITUDE;
if Result.X > MAX_LONGITUDE then
Result.X := MAX_LONGITUDE
else
if Result.X < MIN_LONGITUDE then
Result.X := MIN_LONGITUDE;
end;
procedure TMapViewer.Geolocate;
begin
if Assigned(FGeolocationEngine) then
FGeolocationEngine.Search(Self);
end;
procedure TMapViewer.Center;
var
i: TRealPoint;
begin
i.X := 0;
i.Y := 0;
SetCenterLongLat(i);
RepaintMap(0, 0, False);
end;
procedure TMapViewer.PaintRectangle(AX, AY, X, Y, Z: Int64);
var
XD, YD: Int64;
XB, YB: Int64;
maxOfZ: Int64;
areaR: TRealArea;
areaP: TArea;
textheight: Integer;
image: TBitmap;
s: string;
begin
maxOfZ := IntPower(Z);
if not ((Z = 0) and (X = 0) and (Y = 0)) then
if (X < 0) or (Y < 0) or (X > maxOfZ - 1) or (Y > maxOfZ - 1) then
Exit;
XD := X * TILE_SIZE;
YD := Y * TILE_SIZE;
XB := FX + AX + XD; // begin of X
YB := FY + AY + YD; // begin of Y
image := TBitmap.Create;
try
if (FSource <> msNone) and (not (csDesigning in ComponentState)) then
begin
DownloadTile(X, Y, Z, image);
end;
if FDebug or (csDesigning in ComponentState) then
begin
image.BeginUpdate(True);
try
if (image.Height = 0) or (image.Width = 0) then
begin
image.Height := TILE_SIZE;
image.Width := TILE_SIZE;
image.Canvas.Brush.Color := clWhite;
image.Canvas.FillRect(0, 0, TILE_SIZE, TILE_SIZE);
end;
image.Canvas.Brush.Color := clGray;
image.Canvas.Brush.Style := bsSolid;
image.Canvas.FrameRect(0, 0, TILE_SIZE, TILE_SIZE);
image.Canvas.Brush.Style := bsClear;
areaR := GetLongLat(X, Y, Z);
areaP := GetPixelXY(X, Y, Z);
textheight := image.Canvas.TextHeight('yA');
// x, y, z
s := Format('X: %d Y: %d Z: %d', [X, Y, Z]);
image.Canvas.TextOut(((TILE_SIZE - image.Canvas.TextWidth(s)) div 2), 3+textheight*4, s);
s := 'QuadKey: ' + QuadKey(X, Y, Z);
image.Canvas.TextOut(((TILE_SIZE - image.Canvas.TextWidth(s)) div 2), 3+textheight*5, s);
// long
s := Format('long: %g', [areaR.left]);
image.Canvas.TextOut(3, TILE_SIZE div 2, s);
s := Format('long: %g', [areaR.right]);
image.Canvas.TextOut(TILE_SIZE-image.Canvas.TextWidth(s) - 3, TILE_SIZE div 2, s);
// lat
s := Format('lat: %g', [areaR.top]);
image.Canvas.TextOut(((TILE_SIZE - image.Canvas.TextWidth(s)) div 2) + 3, 3, s);
s := Format('lat: %g', [areaR.bottom]);
image.Canvas.TextOut(((TILE_SIZE - image.Canvas.TextWidth(s)) div 2) + 3, TILE_SIZE - textheight - 3, s);
// pixX
s := Format('X = %d', [areaP.left]);
image.Canvas.TextOut(3, textheight + TILE_SIZE div 2, s);
s := Format('X = %d', [areaP.right]);
image.Canvas.TextOut(TILE_SIZE-image.Canvas.TextWidth(s) - 3, textheight + TILE_SIZE div 2, s);
// pixY
s := Format('Y = %d', [areaP.top]);
image.Canvas.TextOut(((TILE_SIZE - image.Canvas.TextWidth(s)) div 2) + 3, textheight + 3, s);
s := Format('Y = %d', [areaP.bottom]);
image.Canvas.TextOut(((TILE_SIZE - image.Canvas.TextWidth(s)) div 2) + 3, TILE_SIZE - 2 * textheight - 3, s);
image.Canvas.Brush.Color := clWhite;
finally
image.EndUpdate;
end;
end;
if FUseThreads then
begin
FPool.CriticalSection.Enter;
FBitmap.BeginUpdate(True);
try
FBitmap.Canvas.Draw(XB, YB, image);
finally
FBitmap.EndUpdate;
FPool.CriticalSection.Leave;
end;
end
else
begin
FBitmap.BeginUpdate(True);
try
FBitmap.Canvas.Draw(XB, YB, image);
finally
FBitmap.EndUpdate;
end;
end;
finally
image.Free;
end;
end;
function TMapViewer.GetCacheCount: Word;
begin
Result := FCache.Count;
end;
procedure TMapViewer.DownloadTile(X, Y, Z: Integer; Graphic: TBitmap);
function CalcPixels(img: TPortableNetworkGraphic): Integer;
// fix bug when drawing completly transparent png
var
i, j: Integer;
begin
Result := 0;
for i := 0 to img.Width - 1 do
for j := 0 to img.Height - 1 do
if img.Canvas.Pixels[i, j] <> 0 then
begin
Inc(Result);
Break;
end;
end;
function YahooY(Y: Integer): Integer;
begin
Result := - (Y - IntPower(Z) div 2) - 1;
end;
var
stream: TMemoryStream;
img: TGraphic;
url: TStrings;
i: Integer;
ValidCount: Integer;
begin
if not GetFromCache(FSource, X, Y, Z, Graphic) then
begin
url := TStringList.Create;
try
url.Clear;
{$region 'create url list'}
case FSource of
msNone: ;
msGoogleNormal:
url.Add(Format('http://mt%d.google.com/vt/lyrs=m@145&v=w2.104&x=%d&y=%d&z=%d', [Random(4), X, Y, Z]));
msGoogleSatellite:
url.Add(Format('http://khm%d.google.com/kh/v=82&x=%d&y=%d&z=%d&s=Ga', [Random(4), X, Y, Z]));
msGoogleHybrid:
begin
url.Add(Format('http://khm%d.google.com/kh/v=82&x=%d&y=%d&z=%d&s=Ga', [Random(4), X, Y, Z]));
url.Add(Format('http://mt%d.google.com/vt/lyrs=h@145&v=w2.104&x=%d&y=%d&z=%d', [Random(4), X, Y, Z]));
end;
msGooglePhysical:
url.Add(Format('http://mt%d.google.com/vt/lyrs=t@145&v=w2.104&x=%d&y=%d&z=%d', [Random(4), X, Y, Z]));
msGooglePhysicalHybrid:
begin
url.Add(Format('http://mt%d.google.com/vt/lyrs=t@145&v=w2.104&x=%d&y=%d&z=%d', [Random(4), X, Y, Z]));
url.Add(Format('http://mt%d.google.com/vt/lyrs=h@145&v=w2.104&x=%d&y=%d&z=%d', [Random(4), X, Y, Z]));
end;
msOpenStreetMapMapnik:
url.Add(Format('http://%s.tile.openstreetmap.org/%d/%d/%d.png', [Char(Ord('a')+Random(3)), Z, X, Y]));
msOpenStreetMapOsmarender:
url.Add(Format('http://%s.tah.openstreetmap.org/Tiles/tile/%d/%d/%d.png', [Char(Ord('a')+Random(3)), Z, X, Y]));
msOpenCycleMap:
url.Add(Format('http://%s.tile.opencyclemap.org/cycle/%d/%d/%d.png', [Char(Ord('a')+Random(3)), Z, X, Y]));
msVirtualEarthBing:
url.Add(Format('http://ecn.t%d.tiles.virtualearth.net/tiles/r%s?g=671&mkt=en-us&lbl=l1&stl=h&shading=hill', [Random(8), QuadKey(X, Y, Z)]));
msVirtualEarthRoad:
url.Add(Format('http://r%d.ortho.tiles.virtualearth.net/tiles/r%s.png?g=72&shading=hill', [Random(4), QuadKey(X, Y, Z)]));
msVirtualEarthAerial:
url.Add(Format('http://a%d.ortho.tiles.virtualearth.net/tiles/a%s.jpg?g=72&shading=hill', [Random(4), QuadKey(X, Y, Z)]));
msVirtualEarthHybrid:
url.Add(Format('http://h%d.ortho.tiles.virtualearth.net/tiles/h%s.jpg?g=72&shading=hill', [Random(4), QuadKey(X, Y, Z)]));
msYahooNormal:
url.Add(Format('http://maps%d.yimg.com/hx/tl?b=1&v=4.3&.intl=en&x=%d&y=%d&z=%d&r=1', [Random(3)+1, X, YahooY(Y), Z+1]));
msYahooSatellite:
url.Add(Format('http://maps%d.yimg.com/ae/ximg?v=1.9&t=a&s=256&.intl=en&x=%d&y=%d&z=%d&r=1', [Random(3)+1, X, YahooY(Y), Z+1]));
msYahooHybrid:
begin
url.Add(Format('http://maps%d.yimg.com/ae/ximg?v=1.9&t=a&s=256&.intl=en&x=%d&y=%d&z=%d&r=1', [Random(3)+1, X, YahooY(Y), Z+1]));
url.Add(Format('http://maps%d.yimg.com/hx/tl?b=1&v=4.3&t=h&.intl=en&x=%d&y=%d&z=%d&r=1', [Random(3)+1, X, YahooY(Y), Z+1]));
end;
msOviNormal:
url.Add(Format('http://%s.maptile.maps.svc.ovi.com/maptiler/v2/maptile/newest/normal.day/%d/%d/%d/256/png8', [Char(Ord('a')+Random(5)), Z, X, Y]));
msOviSatellite:
url.Add(Format('http://%s.maptile.maps.svc.ovi.com/maptiler/v2/maptile/newest/satellite.day/%d/%d/%d/256/png8', [Char(Ord('a')+Random(5)), Z, X, Y]));
msOviHybrid:
url.Add(Format('http://%s.maptile.maps.svc.ovi.com/maptiler/v2/maptile/newest/hybrid.day/%d/%d/%d/256/png8', [Char(Ord('a')+Random(5)), Z, X, Y]));
msOviPhysical:
url.Add(Format('http://%s.maptile.maps.svc.ovi.com/maptiler/v2/maptile/newest/terrain.day/%d/%d/%d/256/png8', [Char(Ord('a')+Random(5)), Z, X, Y]));
end;
{$endregion}
if (X = 0) and (Y = 0) and (Z = 0) and (FSource in [msYahooHybrid, msYahooSatellite]) then
url.Clear;
Graphic.Height := TILE_SIZE;
Graphic.Width := TILE_SIZE;
ValidCount := 0;
stream := TMemoryStream.Create;
try
for i := 0 to url.Count - 1 do
begin
DownloadFile(url[i], stream);
if IsValidJPEG(stream) then
begin
img := TJPEGImage.Create;
img.LoadFromStream(stream);
end
else
if IsValidPNG(stream) then
begin
img := TPortableNetworkGraphic.Create;
img.LoadFromStream(stream);
end
else
img := nil;
if Assigned(img) then
begin
Inc(ValidCount);
Graphic.Canvas.Brush.Style := bsClear;
if (img is TPortableNetworkGraphic) and (FSource in [msGoogleHybrid, msGooglePhysicalHybrid, msYahooHybrid]) then
begin // fix bug when drawing completly transparent png
if CalcPixels(TPortableNetworkGraphic(img)) > 0 then
Graphic.Canvas.Draw(0, 0, img);
end
else
Graphic.Canvas.Draw(0, 0, img);
img.Free;
end;
end;
stream.Clear;
Graphic.SaveToStream(stream);
stream.Position := 0;
if ValidCount > 0 then
AddToCache(FSource, X, Y, Z, stream);
finally
stream.Free;
end;
finally
url.Free;
end;
end;
end;
procedure TMapViewer.MouseMove(Shift: TShiftState; X: Integer; Y: Integer);
begin
inherited;
if FMouseDown then
begin
// refresh when dragging
if (FOldArea.left <> FVisibleArea.left) or
(FOldArea.top <> FVisibleArea.top) then
begin
MouseUp(mbLeft, Shift, X, Y);
CopyArea(FVisibleArea, FOldArea);
MouseDown(mbLeft, Shift, X, Y);
end
else
RepaintMap(X, Y, True);
end;
end;
procedure TMapViewer.DblClick;
var
r: TRealPoint;
begin
inherited DblClick;
if FAutoZoom then
begin
r := GetMouseMapLongLat(FOffsetX, FOffsetY);
FZoom := FZoom + 1;
SetCenterLongLat(r);
end;
end;
procedure TMapViewer.DoOnResize;
begin
inherited DoOnResize;
FBitmap.Width := Width;
FBitmap.Height := Height;
//FCacheBitmap.Width := Width;
//FCacheBitmap.Height := Height;
FMaxX := (Width div TILE_SIZE) + 1;
FMaxY := (Height div TILE_SIZE) + 1;
if Parent <> nil then
RepaintMap(False);
end;
procedure TMapViewer.MouseUp(Button: TMouseButton; Shift: TShiftState; X: Integer;
Y: Integer);
begin
inherited;
RepaintMap(X, Y);
FX := FX + (X - FOffsetX);
FY := FY + (Y - FOffsetY);
CopyArea(FVisibleArea, FOldArea);
FMouseDown := False;
end;
procedure TMapViewer.RepaintMap(X, Y: Integer; Cached: Boolean);
var
AX, AY: Integer;
startX, startY: Integer;
i, j: Integer;
job: TTileJob;
FCacheBitmap: TBitmap;
begin
if FUpdating then
Exit;
AX := X - FOffsetX;
AY := Y - FOffsetY;
startX := (-(FX+AX)) div TILE_SIZE;
startY := (-(FY+AY)) div TILE_SIZE;
FVisibleArea.left := startX;
FVisibleArea.right := startX + FMaxX;
FVisibleArea.top := startY;
FVisibleArea.bottom := startY + FMaxY;
if not Cached then
begin
FBitmap.Canvas.Brush.Style := bsSolid;
FBitmap.Canvas.FillRect(ClientRect);
for i := FVisibleArea.left to FVisibleArea.right do
for j := FVisibleArea.top to FVisibleArea.bottom do
if FUseThreads then
begin
job := TTileJob.Create;
job.Owner := Self;
job.AX := AX;
job.AY := AY;
job.X := i;
job.Y := j;
FPool.Add(job);
end
else
PaintRectangle(AX, AY, i, j, FZoom);
if FUseThreads then
FPool.Execute;
Canvas.Draw(0, 0, FBitmap);
end
else
begin
if FDoubleBuffering then
begin
FCacheBitmap := TBitmap.Create;
try
FCacheBitmap.Width := Width;
FCacheBitmap.Height := Height;
FCacheBitmap.Canvas.Brush.Style := bsSolid;
FCacheBitmap.Canvas.FillRect(ClientRect);
FCacheBitmap.Canvas.Draw(AX, AY, FBitmap);
Canvas.Draw(0, 0, FCacheBitmap);
finally
FCacheBitmap.Free;
end;
end
else
Canvas.CopyRect(Rect(AX, AY, AX+Width, AY+Height), FBitmap.Canvas, Rect(0, 0, Width, Height));
end;
end;
procedure TMapViewer.RepaintMap(Cached: Boolean);
begin
FOffsetX := 0;
FOffsetY := 0;
RepaintMap(0, 0, Cached);
end;
procedure TMapViewer.SetAutoZoom(const AValue: Boolean);