Add entities procedure

uses CADImage, DXFConv, sgConsts, sgFunction;

...

type

  TForm1 = class(TForm)
    Image1: TImage;

...

implementation

procedure TForm1.AddEntitiesClick(Sender: TObject);
var
  vDrawing: TsgCADImage;
  vLayer: TsgDXFLayer;
  vCircle: TsgDXFCircle;
  vLine: TsgDXFLine;
  vPoly: TsgDXFLWPolyline;
  vVertex: TsgDXFVertex;
  vText: TsgDXFText;
begin
// creating a new drawing structure
  vDrawing := TsgCADImage.Create();
  vDrawing.Converter.InitializeSections();
  vDrawing.CurrentLayout := vDrawing.Layouts[0];
// creating a new layer
  vLayer := TsgDXFLayer.Create;
  vLayer.Name := 'Line';
  vLayer.Color := $7F9FFF;
  vLayer.LineWeight := 2;
// adding the new layer to the drawing
  vDrawing.Converter.Loads(vLayer);
  vDrawing.Converter.Sections[csLayers].AddEntity(vLayer);
// creating a new circle entity
  vCircle := TsgDXFCircle.Create();
  vCircle.Color := clRed;
  vCircle.Point := MakeFPoint(100, 100, 0);
  vCircle.Radius := 50;
// adding a new entity to the drawing
  vDrawing.Converter.Loads(vCircle);
  vDrawing.CurrentLayout.AddEntity(vCircle);
// creating a line
  vLine := TsgDXFLine.Create;
  vLine.Point := MakeFPoint(0, 0, 0);
  vLine.Point := MakeFPoint(100, 100, 0);
  vLine.Layer := vLayer; // the line takes the color and lineweight of the layer
  vDrawing.Converter.Loads(vLine);
  vDrawing.CurrentLayout.AddEntity(vLine);
// creating a 2d polyline
  vPoly := TsgDXFLWPolyline.Create;
  vPoly.Closed := True;
  vVertex := TsgDXFVertex.Create; // vertexes are points of a polyline
  vVertex.Point := MakeFPoint(0, 300, 0);
  vPoly.AddEntity(vVertex);
  vVertex := TsgDXFVertex.Create;
  vVertex.Point := MakeFPoint(250, 300, 0);
  vVertex.Bulge := 0.5; //an arc segment
  vPoly.AddEntity(vVertex);
  vVertex := TsgDXFVertex.Create;
  vVertex.Point := MakeFPoint(250, 0, 0);
  vPoly.AddEntity(vVertex);
  vPoly.ColorCAD := MakeColorCAD(acIndexColor,5); // AutoCAD index color
  vDrawing.Converter.Loads(vPoly);
  vDrawing.CurrentLayout.AddEntity(vPoly);
// creating a text
  vText := TsgDXFText.Create;
  vText.Text  := 'CAD Import VCL examples';
  vText.Point := MakeFPoint(10, 280, 0);
  vText.Height := 10;
  vText.Color := clTeal;
  vDrawing.Converter.Loads(vText);
  vDrawing.CurrentLayout.AddEntity(vText);
  // recalculation of drawing extents
  vDrawing.GetExtents();
//------------------
  Image1.Canvas.StretchDraw(Rect(0, 0,
    Round(vDrawing.Width * Image1.Height / vDrawing.Height), Image1.Height), vDrawing);
  vDrawing.Free;
// See AddEntities demo to find examples of adding other entities and structures
end;