paweld/lazarus-ccr
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LazMapViewer: Center gpx track after loading.

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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@6920 8e941d3f-bd1b-0410-a28a-d453659cc2b4
This commit is contained in:
wp_xxyyzz 2019-05-17 16:52:19 +00:00
parent a71b0da7de
commit e3105224c0
3 changed files with 27 additions and 15 deletions
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4
components/lazmapviewer/example/main.lfm
View File

@ -1,7 +1,7 @@
object MainForm: TMainForm
Left = 345
Left = 304
Height = 640
Top = 121
Top = 109
Width = 883
Caption = 'MainForm'
ClientHeight = 640

14
components/lazmapviewer/example/main.pas
View File

@ -195,22 +195,20 @@ end;
procedure TMainForm.BtnLoadGPXFileClick(Sender: TObject);
var
reader: TGpxReader;
pt: TGpsPoint;
item: TGpsObj;
b: TRealArea;
pt: TRealPoint;
begin
if OpenDialog.FileName <> '' then
OpenDialog.InitialDir := ExtractFileDir(OpenDialog.Filename);
if OpenDialog.Execute then begin
reader := TGpxReader.Create;
try
reader.LoadFromFile(OpenDialog.FileName, MapView.GPSItems);
reader.LoadFromFile(OpenDialog.FileName, MapView.GPSItems, b);
item := MapView.GPSItems.Items[MapView.GPSItems.Count-1];
if item is TGpsPoint then
pt := TGpsPoint(item)
else
if item is TGpsTrack then
pt := TGpsTrack(item).Points[0];
MapView.Center := pt.RealPoint;
pt.Lon := (b.TopLeft.Lon + b.BottomRight.Lon) * 0.5;
pt.Lat := (b.TopLeft.Lat + b.BottomRight.Lat) * 0.5;
MapView.Center := pt;
finally
reader.Free;
end;

24
components/lazmapviewer/source/mvgpx.pas
View File

@ -14,6 +14,7 @@ type
TGpxReader = class
private
ID: Integer;
FMinLat, FMinLon, FMaxLat, FMaxLon: Double;
protected
procedure ReadExtensions(ANode: TDOMNode; ATrack: TGpsTrack);
function ReadPoint(ANode: TDOMNode): TGpsPoint;
@ -23,14 +24,15 @@ type
procedure ReadTrackSegment(ANode: TDOMNode; ATrack: TGpsTrack);
procedure ReadWayPoints(ANode: TDOMNode; AList: TGpsObjectList);
public
procedure LoadFromFile(AFileName: String; AList: TGpsObjectList);
procedure LoadFromStream(AStream: TStream; AList: TGpsObjectList);
procedure LoadFromFile(AFileName: String; AList: TGpsObjectList; out ABounds: TRealArea);
procedure LoadFromStream(AStream: TStream; AList: TGpsObjectList; out ABounds: TRealArea);
end;
implementation
uses
Math,
mvExtraData;
var
@ -141,29 +143,37 @@ end;
{ TGpxReader }
procedure TGpxReader.LoadFromFile(AFileName: String; AList: TGpsObjectList);
procedure TGpxReader.LoadFromFile(AFileName: String; AList: TGpsObjectList;
out ABounds: TRealArea);
var
stream: TStream;
begin
stream := TFileStream.Create(AFileName, fmOpenRead + fmShareDenyNone);
try
LoadFromStream(stream, AList);
LoadFromStream(stream, AList, ABounds);
finally
stream.Free;
end;
end;
procedure TGpxReader.LoadFromStream(AStream: TStream; AList: TGpsObjectList);
procedure TGpxReader.LoadFromStream(AStream: TStream; AList: TGpsObjectList;
out ABounds: TRealArea);
var
doc: TXMLDocument = nil;
node: TDOMNode;
begin
try
ID := random(MaxInt - 1000) + 1000;
FMinLon := 9999; FMinLat := 9999;
FMaxLon := -9999; FMaxLat := -9999;
ReadXMLFile(doc, AStream);
ReadWayPoints(doc.DocumentElement.FindNode('wpt'), AList);
ReadTracks(doc.DocumentElement.FindNode('trk'), AList);
ReadRoute(doc.DocumentElement.FindNode('rte'), AList);
ABounds.TopLeft.Lon := FMinLon;
ABounds.TopLeft.Lat := FMaxLat;
ABounds.BottomRight.Lon := FMaxLon;
ABounds.BottomRight.Lat := FMinLat;
finally
doc.Free;
end;
@ -260,6 +270,10 @@ begin
end;
Result := TGpsPoint.Create(lon, lat, ele, dt);
Result.Name := sname;
FMinLon := Min(FMinLon, lon);
FMaxLon := Max(FMaxLon, lon);
FMinLat := Min(FMinLat, lat);
FMaxLat := Max(FMaxLat, lat);
end;
procedure TGpxReader.ReadRoute(ANode: TDOMNode; AList: TGpsObjectlist);