Use View Clipping planes for geometry selection?

[Colin Gilchrist]

Greetings Chook Gurus,

 

Is there a way to use the clipping planes of the current graphics view to select geometry from the Mastercam database?

 

Here is what we are trying to accomplish:

 

We would like to be able to perform a function like "save some", but take only the geometry that is displayed in the current graphics view. Basically we would like to query the Mastercam database, select "All visible entities", then un-select any entity that falls outside our current graphics view's clipping planes.

 

Does anybody know of a method to do this in C++ or C#?

 

Thanks in advance,

[markov]

Pardon my ignorance, but what are "clipping planes"?

[Takashi Sato from Ai Solutions.]

"clipping planes" are drawing limit planes of

left, right, top, bottom, nearest, farest in the viewport( projection coordinates ,not model view coordinates).

 

Anyway I have no idea for the question.

...run command of selecting by window and send two mouse click messages to the curent gview??

[Takashi Sato from Ai Solutions.]

it may work.

code:

---

 

/**

*

* @par Purpose:

* This method sets select bits for entities that lie within the window and

* clears select bits for entities that lie outside the window.

*

* @param[in] corner1 1st window corner, in uu coordinates

* @param[in] corner2 2nd window corner, in uu coordinates

* @param[in] set_ptn bits to set in .sel

* @param[in] clr_ptn bits to clear in .sel

* @param[in] ent_mask compare .id against this mask

* @param[in] draw whether or not to re-draw entity after changing .sel

* @param[in] mode 1= inside, 2= in+intr, 3= intersect, 4= out+intr, 5= outside

* @param[out] succf TRUE if method was succesful; FALSE otherwise

*

*/

extern DllImpExp void mark_window (

p_2d corner1,

p_2d corner2,

USHORT set_ptn,

USHORT clr_ptn,

ULONG ent_mask,

MC_BOOL draw,

short mode,

MC_BOOL *succf);

---

[Colin Gilchrist]

Satosan,

 

Thanks for the snippet of code, we are trying it now. Pete Rimkus has this to add, I hope it might help you too.

 

quote:

---

 

The following (from CGui.H) can be used to get the extents of the current graphics view in ‘user units’ (“xh” = X high, “xl” = X low, etc)

 

 

extern DllImpExp double get_xh_clip();

extern DllImpExp double get_yh_clip();

extern DllImpExp double get_xl_clip();

extern DllImpExp double get_yl_clip();

 

 

---

[Takashi Sato from Ai Solutions.]

Hi Colin,

Thank you

 

I use to get that values from screen center/wk height/wk width.