procedure Rectangle(Left, Top, Right, Bottom: Double; StrokeColor: TColor; LineWidth: Double = 1; FillColor: TColor = clNone)
Adds a rectangle page object in one call (no need for MoveTo/LineTo).
Convenience helper equivalent to MoveTo + 3xLineTo + ClosePath + AddPath.
All edits to the current page are buffered in PDFium's in-memory representation. Call UpdatePage to refresh the rendering cache and SaveToFile to persist the changes.
Pdf1.Active must be True and a page must be selected before calling these primitives.
begin
if Pdf1.Active then
begin
Pdf1.MoveTo(100, 100);
Pdf1.LineTo(200, 150);
Pdf1.LineTo(200, 200);
Pdf1.ClosePath;
Pdf1.AddPath(clRed, 1.5, clYellow, fmWinding);
Pdf1.UpdatePage;
end;
end;