topic Re: How to force viewportDraw call in ObjectARX Forum

How to force viewportDraw call

Anonymous — Fri, 20 Mar 2015 05:24:17 GMT

I want to force the AutoCAD graphics system to call MyEntity::viewportDraw(). How can I achieve this ?

Regards

Re: How to force viewportDraw call

maisoui — Fri, 20 Mar 2015 10:30:21 GMT

"Return Adesk::kFalse" in subWorldDraw(...).

Regards,

Re: How to force viewportDraw call

Anonymous — Fri, 20 Mar 2015 10:51:34 GMT

Of course I have to return Adesk::kFalse" in subWorldDraw. But, I want subViewportDraw(...) to be called every time I zoom or pan. this function gets called during regen, not necessarly on 'zoom' or 'pan'

Re: How to force viewportDraw call

nick83 — Fri, 20 Mar 2015 11:58:25 GMT

if i understand a problem correctly, AcEditorReactor::commandEnded can't help in all cases, cause you want to see changes inside pan/zoom. So, as a variant, Hook on mouse events is what you need. inside hook use pEnt->draw()

you need in something like the code below:

int startCommand = 0;

BOOL redrawHook(MSG* pMsg)
{
  if (pMsg->message == WM_MOUSEWHEEL)
  {
    if (startCommand < 2)
    {
       startCommand++;
       PostMessage(adsw_hwndAcad,pMsg->message,pMsg->wParam,pMsg->lParam);
       return FALSE;
    }
    else
    {// will work for 1/3 of mousewheel
      CYourClassApp::your_transparent_command();
      startCommand = 0;
      return TRUE;
    }
  }

  if (pMsg->message == WM_MBUTTONUP)
  {
    CYourClassApp::your_transparent_command();
    return FALSE;
  }

  return FALSE;
}

class CYourClassApp : public AcRxArxApp {
  virtual AcRx::AppRetCode On_kInitAppMsg(void* pkt)
  {
    ...
    acedRegisterFilterWinMsg(redrawHook);
    ...
  }
  
  virtual AcRx::AppRetCode On_kUnloadAppMsg(void* pkt)
  {
    ...
    acedRemoveFilterWinMsg(redrawHook);
    ...
  }
  
  static void your_transparent_command()
  {
    // force "draw" for needed entities using pEnt->draw();
  }
}

Re: How to force viewportDraw call

owenwengerd — Fri, 20 Mar 2015 13:54:19 GMT

You need to override subSetAttributes() in your custom entity and include the kDrawableViewDependentViewportDraw flag in the returned value.

Re: How to force viewportDraw call

Anonymous — Sun, 22 Mar 2015 20:04:23 GMT

Thanks Owen,

kDrawableViewDependentViewportDraw works correctly during ZOOM , but AutoCAD(2015) stops working(freezes) during PAN. Any idea what the problem is ?

Re: How to force viewportDraw call

owenwengerd — Mon, 23 Mar 2015 04:22:22 GMT

Without seeing your code I can only guess. My guess is that your viewport drawing code changes the view.

Re: How to force viewportDraw call

Anonymous — Mon, 23 Mar 2015 15:26:50 GMT

Hi Owen,

Panning deosn't freeze autocad when I turn off Adaptive Degradation. But unlike Zooming it doesn't regenarate my drawing.

In my viewport Drawing, I have replaced " AcGsView *view " by " getNumPixelsInUnitSquare " to get aspect ratio. But that didn't help. Could you please explain what you mean by the viewport drawing code changes the view ?

Thanks in advance

Re: How to force viewportDraw call

Balaji_Ram — Tue, 24 Mar 2015 05:24:28 GMT

I have seen issues with the viewportDraw not getting called in a AcGiDrawableOverrule even when kDrawableViewDependentViewportDraw was specified when in "2d Wireframe" visual style. It had worked ok in other shaded modes. I am not sure if this is related to your query, so you can also try changing the Visual style.

The other way could be to use "kDrawableViewIndependentViewportDraw" as the attribute and ensure that the viewportDraw gets called using AcGsView::invalidateCachedViewportGeometry.

Regards,

Balaji

Re: How to force viewportDraw call

Anonymous — Mon, 30 Mar 2015 11:16:37 GMT

I put 'AcGsView::invalidateCachedViewportGeometry' inside 'AcEditorReactor::viewChanged' and PANNING is working fine. It's a bit slower compared to Zooming though.