Snap mouse pointer to object?

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On 31/03/2012 at 09:44, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   12 
Platform:   Windows  ;   
Language(s) :     C++  ;

---------
I've long wished for bezier spline tools in C4D. So that we can paint smooth accurate custom curves.
The only way I see to draw a custom curved paint stroke in C4D is to use the spline shader. Which relies on UV's. Making it not very predictable or interactive.

Is there a way to make the mouse pointer snap to a spline in the API?
Or maybe a way to turn an object into a paintbrush somehow?
If an object could be used to paint another object. Then I could snap that object to a spline path and create smooth custom paint strokes that way.

-ScottA

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On 31/03/2012 at 10:19, xxxxxxxx wrote:

http://www.blackstar-solutions.de/index.php?id=11917

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On 31/03/2012 at 11:12, xxxxxxxx wrote:

That's cool.
But it doesn't help me learn how to make it myself.

-ScottA

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On 02/04/2012 at 10:29, xxxxxxxx wrote:

You may check the Snapping library and its main class, DetectSnapping.
If you want to use it in a tool plugin, here is how to initialize and invoke this class in ToolData::MouseInput() :

Bool MyToolData::MouseInput(BaseDocument* doc, BaseContainer& data, BaseDraw* bd, EditorWindow* win, const BaseContainer& msg)
{
    AutoAlloc<DetectSnapping> snap;
    if (!snap) return FALSE;
    snap->Init(doc, bd, NULL, Vector(), 0, FALSE, TRUE, TRUE);
  
    Vector delta;
    Vector pos = bd->SW(Vector(Real(msg.GetLong(BFM_INPUT_X)), Real(msg.GetLong(BFM_INPUT_Y)), RCO 0));
  
    if (snap->SnapTo(pos, &delta))
    {
        pos += delta;
    }
  
    return TRUE;
}

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On 02/04/2012 at 11:53, xxxxxxxx wrote:

Thanks Yannick.

Sorry for being stupid.
But when I use that code in a tool plugin. Nothing happens.

-ScottA

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On 02/04/2012 at 14:13, xxxxxxxx wrote:

Hi,
Yannick code is fine you only have to apply it in your case.
here a little example try to put it in liquid tool in c4dsdk example and remember to turn on and set snap settings:

Bool LiquidToolData::MouseInput(BaseDocument *doc, BaseContainer &data;, BaseDraw *bd,EditorWindow *win, const BaseContainer &msg;)   
{   
     //get mouse position   
     Real                    mx = msg.GetReal(BFM_INPUT_X);   
     Real                    my = msg.GetReal(BFM_INPUT_Y);   
  
     Vector               pos = bd->SW(Vector(mx, my, 500)); // bring mouse pos in world space   
     Vector               delta = Vector();   
     BaseObject     *active = doc->GetActiveObject(); // get the active object   
        
     LONG                    button;   
     switch (msg.GetLong(BFM_INPUT_CHANNEL))   
     {   
          case BFM_INPUT_MOUSELEFT : button=KEY_MLEFT; break;   
          case BFM_INPUT_MOUSERIGHT: button=KEY_MRIGHT; break;   
          default: return TRUE;   
     }   
        
     if (!active) // if no active object create a new sphere and inser it in document   
     {   
          active = BaseObject::Alloc(Osphere);   
          if (!active) return FALSE;   
          doc->InsertObject(active, NULL, NULL, TRUE);   
          active->SetAbsPos(pos);   
     }   
        
     AutoAlloc<DetectSnapping>snap; // alloc the snap   
     if (!snap) return FALSE;   
     snap->Init(doc, bd, NULL, Vector(), 0, FALSE, TRUE, TRUE); // initialize snap   
        
     Real                         dx,dy;   
     BaseContainer bc;   
     BaseContainer device;   
     win->MouseDragStart(button,mx,my,MOUSEDRAGFLAGS_DONTHIDEMOUSE|MOUSEDRAGFLAGS_NOMOVE);   
     while (win->MouseDrag(&dx;,&dy;,&device;)==MOUSEDRAGRESULT_CONTINUE) // start drag   
     {   
          // increment mouse position during drag   
          mx+=dx;   
          my+=dy;   
          pos = bd->SW(Vector(mx, my, 500)); // update pos   
          if (snap->SnapTo(pos, δ)) // if point snap anywhere   
    {   
               pos += delta; // pos will be updated with snapped delta   
    }             
             
          if (active) active->SetAbsPos(pos); // set the object position to the new one!   
             
          DrawViews(DRAWFLAGS_ONLY_ACTIVE_VIEW|DRAWFLAGS_NO_THREAD|DRAWFLAGS_NO_ANIMATION); //update viewport   
     }   
        
     win->MouseDragEnd(); // reset viewport status   
        
     EventAdd();        
     return TRUE;   
}

i hope this help
Franz

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On 02/04/2012 at 15:24, xxxxxxxx wrote:

Thank you Franz. That does make it more clear.

That gives me a way to snap an object to a spline. While also staying attached to the mouse cursor.
Acting like a brush.
But now I have to somehow paint with that object. Like that paint shader does.

Any ideas how I would accomplish that?

-ScottA