Determine the 3-D coordinates of an entity snap.
This function uses the Bricscad entity snap modes to find a point. You specify which entity snap mode to use with the mode argument. You can assign multiple modes simultaneously.
| Mode | Meaning |
|---|---|
| "nea" | NEArest |
| "end" | ENDpoint |
| "mid" | MIDpoint |
| "cen" | CENter |
| "per" | PERpendicular |
| "tan" | TANgent |
| "qua" | QUAdrant |
| "ins" | INSertion |
| "po" | POint |
| "int" | INTersection (3D intersection) |
| "pla" | PLAnview (2D intersection) |
| "vis" | VISible (apparent intersection) |
| "off" | Off |
Using the point argument, you specify a point near the entity where the snap attaches to. If no point is found that specifies the mode requirements, the function returns nil.
Examples
| Code | Returns |
|---|---|
| (osnap '(1 5) "center") | (5.0 5.0 0.0) |
| (osnap p1 "midp,endp,center") | (2.5 3.0 0.0) |
NOTE The distance allowable between the starting point and the entity is determined by the system variable APERTURE, which ranges from 1 to 50 pixels.
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Programming Overview of LISP (LISt Processing) Language
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