import com.radaee.pdf.*;

        //doc is object of Document
        Page page = doc.NewPage(0, 210.0f * 72 / 25.4f, 297.0f * 72 / 25.4f);//create A4 paper size on page 0. 

        //the created page initialized as blank page, so we draw some contents as following:
        page.ObjsStart();//load page contents.

        Path path = new Path();
        path.MoveTo(50, 50);
        path.LineTo(100, 150);
        path.LineTo(300, 10);
        path.ClosePath();;//close contour.
        PageContent content = new PageContent();
        content.SetFillColor(0xFFFF0000);//red
        content.FillPath(path, true);
        page.AddContent(content, true);//flush for rendering later.
        //page.AddContent(content, false);//not flush, if it write only.
        page.Close();