Draw line with lineweigth by AcEdInputPointMonitor class

majklha — Thu, 26 Feb 2026 16:05:38 GMT

I have a class CMajUsekMonitor derived from AcEdInputPointMonitor.

In method ...monitorInputPoint(const AcEdInputPoint &input, AcEdInputPointMonitorResult &output) I need to draw temporay line, and for amhasizing I need it draw with bigger thickness.

I try this, but it doesnot work (in drawing I have LWDISPLAY on):

How force Autocad to draw thick line.

Acad::ErrorStatus CMajUsekMonitor::monitorInputPoint(const AcEdInputPoint &input, AcEdInputPointMonitorResult &output) { if (input.pointComputed()) { getNearest(input.computedPoint()); auto &traits = input.drawContext()->subEntityTraits(); traits.setColor(2); traits.setLineWeight(AcDb::kLnWt140); traits.setSelectionMarker(2); AcGePoint3d pts[2] = { asPnt3d(m_itLom->bod), asPnt3d((m_itLom + 1)->bod) }; input.drawContext()->geometry().polyline(2, pts); if (m_bInfo) acedGrText(-1, m_itLom->GetInfo(), 0); } return Acad::eOk; }

Re: Draw line with lineweigth by AcEdInputPointMonitor class

daniel_cadext — Fri, 27 Feb 2026 01:25:02 GMT

I could not get it to work either; I also tried just drawing a polyline in geo.draw()

You may be able to simulate it though, a wacky proof of concept using polygon

# C++ hint # rt = ads_getvar(L"VIEWSIZE", &var); # view->setHeight(var.resval.rreal); # resbuf rbScreen; # if (acedGetVar(_T("SCREENSIZE"), &rbScreen) == RTNORM) # { # double pixelX = rbScreen.resval.rpoint[X]; # double pixelY = rbScreen.resval.rpoint[Y]; # if (pixelY != 0) # { # view->setWidth(var.resval.rreal * (pixelX / pixelY)); # } # } # do this in mfc display = wx.Display(0) geometry = display.GetGeometry() screen_res_y = float(geometry.Height) class MyPointMonitor(Ed.InputPointMonitor): def __init__(self): Ed.InputPointMonitor.__init__(self) def simulatePolygon(self, a: Ge.Point3d, b: Ge.Point3d, pixel_width: float = 5): v = Ed.Core.getCurrentView() thickness = (v.height() / screen_res_y) * pixel_width vec: Ge.Vector3d = b - a if vec.length() < 1e-6: return [] perp_vec = Ge.Vector3d(-vec.y, vec.x, 0).normal() offset = thickness / 2.0 p1 = a + (perp_vec * offset) p2 = a - (perp_vec * offset) p3 = b - (perp_vec * offset) p4 = b + (perp_vec * offset) return [p1, p4, p3, p2, p1] def monitorInputPoint(self, input: Ed.InputPoint, output): try: ents = input.pickedEntities() if len(ents) == 0: return p = input.rawPoint() geo = input.drawContext().geometry() tr = input.drawContext().subEntityTraits() tr.setFillType(Gi.FillType.kAcGiFillAlways) tr.setColor(3) plypnts = self.simulatePolygon( p, p + (Ge.Point3d(0, 0, 0) - Ge.Point3d(100, 100, 0)) ) geo.polygon(plypnts) tr.setColor(1) plypnts = geo.polyline( [p, p + (Ge.Point3d(100, 100, 0) - Ge.Point3d(0, 0, 0))] ) except Exception as err: print(err)

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Draw line with lineweigth by AcEdInputPointMonitor class

Re: Draw line with lineweigth by AcEdInputPointMonitor class