LazMapViewer: Add methods DeleteSelectedPoints, ConvertSelectedPointsToMapArea and ConvertSelectedPointsToMapTrack to TMarkerSelectAndDragPlugin

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@9690 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/lazmapviewer/examples/plugin_demos/markerselectdrag_demo/MarkerSelectAndDrag_Demo.lpi

@@ -59,12 +59,8 @@
     <Linking>
       <Debugging>
         <DebugInfoType Value="dsDwarf3"/>
+        <UseHeaptrc Value="True"/>
       </Debugging>
-      <Options>
-        <Win32>
-          <GraphicApplication Value="True"/>
-        </Win32>
-      </Options>
     </Linking>
   </CompilerOptions>
   <Debugging>

components/lazmapviewer/examples/plugin_demos/markerselectdrag_demo/main.lfm

@@ -14,7 +14,6 @@ object MainForm: TMainForm
     Top = 0
     Width = 653
     Align = alClient
-    Cyclic = True
     DownloadEngine = MapView.BuiltInDLE
     DrawingEngine = MapView.BuiltInDE
     Layers = <>
@@ -153,6 +152,46 @@ object MainForm: TMainForm
       TabOrder = 2
       OnChange = cbMultiSelectChange
     end
+    object Button1: TButton
+      AnchorSideLeft.Control = rgClickMode
+      AnchorSideLeft.Side = asrBottom
+      AnchorSideTop.Control = rgClickMode
+      Left = 520
+      Height = 25
+      Top = 8
+      Width = 109
+      AutoSize = True
+      BorderSpacing.Left = 8
+      Caption = 'Delete selection'
+      TabOrder = 3
+      OnClick = Button1Click
+    end
+    object Button2: TButton
+      AnchorSideLeft.Control = Button1
+      AnchorSideTop.Control = Button1
+      AnchorSideTop.Side = asrBottom
+      Left = 520
+      Height = 25
+      Top = 33
+      Width = 111
+      AutoSize = True
+      Caption = 'Convert to track'
+      TabOrder = 4
+      OnClick = Button2Click
+    end
+    object Button3: TButton
+      AnchorSideLeft.Control = Button1
+      AnchorSideTop.Control = Button2
+      AnchorSideTop.Side = asrBottom
+      Left = 520
+      Height = 25
+      Top = 58
+      Width = 107
+      AutoSize = True
+      Caption = 'Convert to area'
+      TabOrder = 5
+      OnClick = Button3Click
+    end
   end
   object PluginManager: TMvPluginManager
     Left = 401

components/lazmapviewer/examples/plugin_demos/markerselectdrag_demo/main.pas

@@ -15,6 +15,9 @@ type
 
   TMainForm = class(TForm)
     Bevel1: TBevel;
+    Button1: TButton;
+    Button2: TButton;
+    Button3: TButton;
     cgPointTypes: TCheckGroup;
     cbMultiSelect: TCheckBox;
     Label1: TLabel;
@@ -24,6 +27,9 @@ type
     MapView: TMapView;
     PluginManager: TMvPluginManager;
     rgClickMode: TRadioGroup;
+    procedure Button1Click(Sender: TObject);
+    procedure Button2Click(Sender: TObject);
+    procedure Button3Click(Sender: TObject);
     procedure cgPointTypesItemClick(Sender: TObject; Index: integer);
     procedure cbMultiSelectChange(Sender: TObject);
     procedure FormCreate(Sender: TObject);
@@ -111,6 +117,24 @@ procedure TMainForm.FormCreate(Sender: TObject);
       TMapTrackPoint(track.Points.Add).RealPoint := APoints[i];
   end;
 
+  procedure AddMapArea(const APoints: TRealPointArray);
+  var
+    layer: TMapLayer;
+    area: TMapArea;
+    i: Integer;
+  begin
+    if MapView.Layers.Count = 0 then
+      layer := MapView.Layers.Add as TMapLayer
+    else
+      layer := MapView.Layers[0];
+    area := layer.Areas.Add as TMapArea;
+    area.Caption := 'Test area';
+    area.FillColor := clBlue;
+    area.Opacity := 0.5;
+    for i := 0 to High(APoints) do
+      TMapAreaPoint(area.Points.Add).RealPoint := APoints[i];
+  end;
+
 var
   i: Integer;
 begin
@@ -125,6 +149,8 @@ begin
   AddGPSTrack([RealPoint(-20,20), RealPoint(20, 0), RealPoint(-20,-20)]);
   AddMapTrack([RealPoint(20,20), RealPoint(-20,0), RealPoint(20,-20)]);
 
+  AddMapArea ([RealPoint(60, -45), RealPoint(70, -48), RealPoint(64, -35)]);
+
   Plugin := TMarkerSelectAndDragPlugin.Create(PluginManager);
 
   for i := 0 to cgPointTypes.Items.Count-1 do
@@ -148,6 +174,30 @@ begin
   Plugin.PointTypes := pointTypes;
 end;
 
+procedure TMainForm.Button1Click(Sender: TObject);
+begin
+  Plugin.DeleteSelectedPoints(MapView);
+end;
+
+procedure TMainForm.Button2Click(Sender: TObject);
+begin
+  with Plugin.ConvertSelectedPointsToMapTrack(MapView, MapView.Layers[0]) do
+  begin
+    LineColor := clGreen;
+    LineWidth := 1.0;
+  end;
+end;
+
+procedure TMainForm.Button3Click(Sender: TObject);
+begin
+  with Plugin.ConvertSelectedPointsToMapArea(MapView, MapView.Layers[0]) do
+  begin
+    FillColor := clBlack;
+    LineColor := clBlack;
+    Opacity := 0.5;
+  end;
+end;
+
 procedure TMainForm.cbMultiSelectChange(Sender: TObject);
 begin
   Plugin.MultiSelect := cbMultiSelect.Checked;

components/lazmapviewer/source/addons/plugins/markers/mvmarkerplugins.pas

@@ -107,11 +107,12 @@ type
     FSelection: TGPSPointList;
     FOrigSelection: array of TRealPoint;  // Selection before dragging starts
     FOnDrawPoint: TMarkerDrawPointEvent;
-    FOnSelect: TNotifyEvent;
+    FOnSelectionChange: TNotifyEvent;
     procedure SetMultiSelect(AValue: Boolean);
   protected
     procedure AddToSelection(AMapView: TMapView; APoint: TGPSPoint);
-    procedure DoSelect(AMapView: TMapView);
+    procedure DeleteFromList(AMapView: TMapView; APoint: TGPSPoint);
+    procedure DoSelectionChange(AMapView: TMapView);
     procedure DragStart(AMapView: TMapView);
     procedure DragTo(AMapView: TMapView; X, Y: Integer);
     procedure DragEnd(AMapView: TMapView);
@@ -131,13 +132,16 @@ type
   public
     constructor Create(AOwner: TComponent); override;
     destructor Destroy; override;
+    function ConvertSelectedPointsToMapArea(AMapView: TMapView; ALayer: TMapLayer): TMapArea;
+    function ConvertSelectedPointsToMapTrack(AMapView: TMapView; ALayer: TMapLayer): TMapTrack;
+    procedure DeleteSelectedPoints(AMapView: TMapView);
     property Selection: TGPSPointList read FSelection;
   published
     property ClickMode: TMarkerClickMode read FClickMode write FClickMode default mcmAddToSelection;
     property DragCursor: TCursor read FDragCursor write FDragCursor default crSizeAll;
     property MultiSelect: Boolean read FMultiSelect write SetMultiSelect default false;
     property OnDrawPoint: TMarkerDrawPointEvent read FOnDrawPoint write FOnDrawPoint;
-    property OnSelect: TNotifyEvent read FOnSelect write FOnSelect;
+    property OnSelectionChange: TNotifyEvent read FOnSelectionChange write FOnSelectionChange;
   end;
 
 
@@ -354,6 +358,29 @@ end;
 
 { TMarkerSelectAndDragPlugin }
 
+type
+  TMarkerData = record
+    Lat, Lon: Double;
+    Elevation: Double;
+    DateTime: TDateTime;
+  end;
+
+function GPSPointToMarkerData(P: TGPSPoint): TMarkerData;
+begin
+  Result.Lat := P.Lat;
+  Result.Lon := P.Lon;
+  Result.Elevation := P.Elevation;
+  Result.DateTime := P.DateTime;
+end;
+
+procedure MarkerDataToGPSPoint(M: TMarkerData; P: TGPSPoint);
+begin
+  P.Lat := M.Lat;
+  P.Lon := M.Lon;
+  P.Elevation := M.Elevation;
+  P.DateTime := M.DateTime;
+end;
+
 constructor TMarkerSelectAndDragPlugin.Create(AOwner: TComponent);
 begin
   inherited;
@@ -384,7 +411,51 @@ begin
     FSelection.Clear;
     FSelection.Add(APoint);
   end;
-  DoSelect(AMapView);
+  DoSelectionChange(AMapView);
+end;
+
+function TMarkerSelectAndDragPlugin.ConvertSelectedPointsToMapArea(
+  AMapView: TMapView; ALayer: TMapLayer): TMapArea;
+var
+  M: TMarkerData;
+  P: TMapPoint;
+begin
+  if FSelection.Count < 2 then
+    raise EMvPluginException.Create('Selection must contain at least 3 points');
+
+  Result := ALayer.Areas.Add as TMapArea;
+  while FSelection.Count > 0 do
+  begin
+    M := GPSPointToMarkerData(FSelection[0]);
+    DeleteFromList(AMapView, FSelection[0]);
+    FSelection.Delete(0);
+    P := Result.Points.Add as TMapPoint;
+    MarkerDataToGPSPoint(M, TGPSPoint(P.GPSObj));
+  end;
+  Update;
+  DoSelectionChange(AMapView);
+end;
+
+function TMarkerSelectAndDragPlugin.ConvertSelectedPointsToMapTrack(
+  AMapView: TMapView; ALayer: TMapLayer): TMapTrack;
+var
+  M: TMarkerData;
+  P: TMapPoint;
+begin
+  if FSelection.Count < 2 then
+    raise EMvPluginException.Create('Selection must contain at least 2 points');
+
+  Result := ALayer.Tracks.Add as TMapTrack;
+  while FSelection.Count > 0 do
+  begin
+    M := GPSPointToMarkerData(FSelection[0]);
+    DeleteFromList(AMapView, FSelection[0]);
+    FSelection.Delete(0);
+    P := Result.Points.Add as TMapPoint;
+    MarkerDataToGPSPoint(M, TGPSPoint(P.GPSObj));
+  end;
+  Update;
+  DoSelectionChange(AMapView);
 end;
 
 procedure TMarkerSelectAndDragPlugin.AfterDrawObjects(AMapView: TMapView;
@@ -394,10 +465,22 @@ begin
   DrawSelection(AMapView);
 end;
 
-procedure TMarkerSelectAndDragPlugin.DoSelect(AMapView: TMapView);
+procedure TMarkerSelectAndDragPlugin.DeleteSelectedPoints(AMapView: TMapView);
+var
+  i: Integer;
 begin
-  if Assigned(FOnSelect) then
-    FOnSelect(AMapView);
+  for i := FSelection.Count-1 downto 0 do
+  begin
+    DeleteFromList(AMapView, FSelection[i]);
+    FSelection.Delete(i);
+  end;
+  Update;
+end;
+
+procedure TMarkerSelectAndDragPlugin.DoSelectionChange(AMapView: TMapView);
+begin
+  if Assigned(FOnSelectionChange) then
+    FOnSelectionChange(AMapView);
 end;
 
 procedure TMarkerSelectAndDragPlugin.DragStart(AMapView: TMapView);
@@ -406,7 +489,7 @@ var
 begin
   AMapView.Cursor := DragCursor;
   FDragging := true;
-  // Save original selection point coordinates in case it must be restored later.
+  // Save original selection point coordinates in case they must be restored later.
   SetLength(FOrigSelection, FSelection.Count);
   for i := 0 to High(FOrigSelection) do
     FOrigSelection[i] := FSelection[i].RealPoint;
@@ -467,7 +550,7 @@ begin
   DE.PenColor := clRed;
   DE.PenStyle := psSolid;
   DE.PenWidth := 2;
-  DE.BrushColor := clWhite;
+  DE.BrushColor := clBlack;
   DE.BrushStyle := bsSolid;
   markerSize := AMapView.Scale96ToFont(MARKER_SIZE);
   for i := 0 to FSelection.Count - 1 do
@@ -476,7 +559,7 @@ begin
     begin
       // The last point is marked as being "focused"
       DE.PenWidth := 3;
-      DE.BrushColor := clBlack;
+      DE.BrushColor := clLime;
       inc(markerSize, 1);
     end;
     P := AMapView.LatLonToScreen(FSelection[i].RealPoint);
@@ -559,6 +642,100 @@ begin
     DragEnd(AMapView);
 end;
 
+{ Searches for the given point in all the point lists of the mapviewer
+  (GPSItems, Layers, Tracks, Areas, POIs). If found, the point is removed
+  from the list and destroyed. }
+procedure TMarkerSelectAndDragPlugin.DeleteFromList(AMapView: TMapView;
+  APoint: TGPSPoint);
+var
+  i, j, k: Integer;
+  gpsLayer: TGPSObjectList;
+  gpsPolyline: TGPSPolyLine;
+  item: TGPSObj;
+  p: TMapPoint;
+  mapLayer: TMapLayer;
+  mapTrack: TMapTrack;
+  mapArea: TMapArea;
+
+  function IsSamePoint(AItem: TGPSObj): Boolean;
+  begin
+    Result := (AItem is TGPSPoint) and TGPSPoint(AItem).RealPoint.Equal(APoint.RealPoint);
+  end;
+
+begin
+  // Check the 10 layers of GPSItems
+  for i := 0 to 9 do
+  begin
+    gpsLayer := AMapView.GPSLayer[i];
+    for j := 0 to gpsLayer.Count-1 do
+    begin
+      item := gpsLayer[j];
+      if IsSamePoint(item) then
+      begin
+        gpsLayer.Delete(item);
+        exit;
+      end;
+      if (item is TGPSPolyline) then
+      begin
+        gpsPolyLine := TGPSPolyLine(item);
+        for k := 0 to gpsPolyLine.Points.Count-1 do
+        begin
+          item := gpsPolyLine.Points[k];
+          if IsSamePoint(item) then
+          begin
+            gpsPolyLine.Points.Delete(k);
+            exit;
+          end;
+        end;
+      end;
+    end;
+  end;
+
+  // Check the map layers
+  for i := 0 to AMapView.Layers.Count-1 do
+  begin
+    mapLayer := AMapView.Layers[i];
+    // Points of interest?
+    for j := 0 to mapLayer.PointsOfInterest.Count-1 do
+    begin
+      p := mapLayer.PointsOfInterest[j];
+      if IsSamePoint(p.GPSObj) then
+      begin
+        mapLayer.PointsOfInterest.Delete(j);
+        exit;
+      end;
+    end;
+    // Tracks?
+    for j := 0 to mapLayer.Tracks.Count-1 do
+    begin
+      mapTrack := mapLayer.Tracks[j];
+      for k := 0 to mapTrack.Points.Count-1 do
+      begin
+        p := mapTrack.Points[k];
+        if IsSamePoint(p.GPSObj) then
+        begin
+          mapTrack.Points.Delete(k);
+          exit;
+        end;
+      end;
+    end;
+    // Areas?
+    for j := 0 to mapLayer.Areas.Count-1 do
+    begin
+      mapArea := mapLayer.Areas[j];
+      for k := 0 to mapArea.Points.Count-1 do
+      begin
+        p := mapArea.Points[k];
+        if IsSamePoint(p.GPSObj) then
+        begin
+          mapArea.Points.Delete(k);
+          exit;
+        end;
+      end;
+    end;
+  end;
+end;
+
 procedure TMarkerSelectAndDragPlugin.SetMultiSelect(AValue: Boolean);
 begin
   if FMultiSelect = AValue then exit;
@@ -584,7 +761,7 @@ begin
     FSelection.Add(APoint);
   end else
     FSelection.Delete(idx);
-  DoSelect(AMapView);
+  DoSelectionChange(AMapView);
 end;