I’m searching for an example code to create arrows like from the gumball which can be moved and and where i can react on the changes during or after the movement.
For example like in rhinogold where you can drag and move a circle to change the position and the diameter (e.g. in the video https://www.youtube.com/watch?v=ISX3dRaZpnI starting at 3:20)
I also made a screenshot and marked the arrows and points which i want to create by my own.
following.
Hi @dsw,
There is a RhinoCommon sample that demonstrates how to manipulate geometry with a gumball.
If you need something in C++ or you need a different sample, let me know.
– Dale
Hi @dale
Thank you for the sample. I think it’s exactly what i wanted. Unfortunately i could not translate everything correctly to c++. i got some weird result.
It would be helpful if you got a simple example how to deal with two ore more gumballs in C++.
Thanks
Hi @dsw,
I’ll try to make this more of a priority.
https://mcneel.myjetbrains.com/youtrack/issue/RH-37372
– Dale
Hi @dale
i made now a short c++ sample by converting your C# sample. It’s not yet fully functional, but it shows my problem with the picking of the gumball. I cannot pick the correct axis, in my case it’s always the y-rotation in perspective view and in the other views i cannot pick at all.
I’m pretty sure there is something wrong with the picking context, but referring to the c++ sample from you ( http://developer.rhino3d.com/guides/cpp/picking-objects-without-crhinogetobject/) it should work.
Can you please have a look at this code?
Thanks
ON_Plane gPlane;
double gRadius = 1.0;
double gHeight = 2.0;
class SampleCsGumballCylinderGetPoint : public CRhinoGetPoint
{
CRhinoGumballDisplayConduit* m_height_dc;
ON_3dPoint m_base_origin;
ON_3dPoint m_base_point;
public:
SampleCsGumballCylinderGetPoint(CRhinoGumballDisplayConduit* heightDc)
{
m_height_dc = heightDc;
m_base_origin = ON_3dPoint::UnsetPoint;
m_base_point = ON_3dPoint::UnsetPoint;
}
virtual void OnMouseDown(CRhinoViewport& vp, UINT nFlags, const ON_3dPoint& point, const CPoint* view_wnd_point)
{
if (m_height_dc->m_pick_result.m_gumball_mode != GUMBALL_MODE::gb_mode_nothing)
return;
m_base_origin = ON_3dPoint::UnsetPoint;
m_base_point = ON_3dPoint::UnsetPoint;
m_height_dc->m_pick_result.SetToDefaultPickResult();
CRhinoPickContext pick_context;
pick_context.m_view = vp.ParentView();
pick_context.m_pick_style = CRhinoPickContext::point_pick;
switch (vp.DisplayMode())
{
case ON::shaded_display:
case ON::renderpreview_display:
pick_context.m_pick_mode = CRhinoPickContext::shaded_pick;
break;
}
vp.GetPickXform(view_wnd_point->x, view_wnd_point->y, pick_context.m_model_xform);
vp.VP().GetFrustumLine(view_wnd_point->x, view_wnd_point->y, pick_context.m_pick_line);
pick_context.UpdateClippingPlanes();
// try picking one of the gumballs
if (m_height_dc->PickGumball(pick_context, this))
{
m_base_origin = gPlane.Origin();
m_base_point = point;
}
}
virtual void OnMouseMove(CRhinoViewport& vp, UINT nFlags, const ON_3dPoint& point, const CPoint* view_wnd_point)
{
if (m_base_origin.IsValid() && m_base_point.IsValid())
{
ON_Line world_line;
if (vp.VP().GetFrustumLine(view_wnd_point->x, view_wnd_point->y, world_line))
{
ON_3dVector dir = point - m_base_point;
double len = dir.Length();
if (m_base_origin.DistanceTo(point) < m_base_origin.DistanceTo(m_base_point))
len = -len;
if (m_height_dc->m_pick_result.m_gumball_mode != GUMBALL_MODE::gb_mode_nothing)
{
// update hight gumball
m_height_dc->UpdateGumball(point, world_line);
// update cylinder
gHeight = len;
}
}
}
CRhinoGetPoint::OnMouseMove(vp, nFlags, point, view_wnd_point);
}
virtual void DynamicDraw(HDC dc, CRhinoViewport& vp, const ON_3dPoint& point)
{
ON_Cylinder cyl;
cyl.Create(ON_Circle(gPlane, gRadius), gHeight);
vp.DrawCylinder(cyl);
// Disable default GetPoint drawing by not calling the base class
// implementation. All aspects of gumball display are handled by
// GumballDisplayConduit
//base.OnDynamicDraw(e);
}
CRhinoGet::result MoveGumball()
{
return this->GetPoint(nullptr, true);
}
};
CRhinoCommand::result SampleCommand::RunCommand( const CRhinoCommandContext& context )
{
CRhinoGetPoint gp;
gp.SetCommandPrompt(L"Base of cylinder");
gp.GetPoint();
if (gp.CommandResult() != success)
return gp.CommandResult();
gRadius = 1.0;
gHeight = 2.0;
ON_3dPoint center = gp.Point();
gPlane = ON_Plane::World_xy;
CRhinoView* view = gp.View();
if (nullptr != view)
gPlane = view->ActiveViewport().ConstructionPlane().m_plane;
gPlane.SetOrigin(center);
CRhinoGumball height_go;
CRhinoGumballDisplayConduit height_dc;
while (true)
{
height_go.SetFromPlane(gPlane);
height_dc.SetBaseGumball(height_go);
height_dc.Enable();
height_dc.EnableGumballDraw(true);
SampleCsGumballCylinderGetPoint gx(&height_dc);
gx.SetCommandPrompt(L"Drag gumball. Press Enter when done");
gx.AcceptNothing(true);
gx.MoveGumball();
//radius_dc.Disable();
height_dc.Disable();
if (gx.CommandResult() != success)
break;
CRhinoGet::result res = gx.Result();
if (res == CRhinoGet::point)
{
continue;
}
if (res == CRhinoGet::nothing)
{
}
break;
}
RhinoApp().ActiveDoc()->Redraw(CRhinoView::regenerate_display_hint);
return success;
}Hi @dsw,
Sorry this took so long. Here is (basically) a port of the C# version.
I sure wish this were easier…
– Dale
Hi @dale
i tried this code in my project, but unfortunately it does not work because in Rhino 5 i do not have SetClippingRegionTransformation.
And if i calculate the clipping region by the pickcontext itself with UpdateClippingPlanes(), the sample does not work. i can see the preview and the arrows, but i cannot pick and drag them.
Is there a workaround in Rhino 5?
I’ve added a V5-equivalent.
– Daler
Hi @dale
thank you very much for your fast support. Everything works perfect! 