topic Random block insertion into defined area in AutoCAD Map 3D Developer Forum

Random block insertion into defined area

Anonymous — Wed, 23 Apr 2014 07:05:02 GMT

Hi!

Is there a command or lisp to randomly insert certain blocks (eg. trees) into polyline defined area ? So I select some area defined with polyline and then I want to insert into that area randomly lots of tree blocks (or whatever blocks).

Tried to google but didn't find anything useful.

Any ideas ?

Re: Random block insertion into defined area

Alfred.NESWADBA — Thu, 24 Apr 2014 11:04:49 GMT

Hi,

I did something like that with the following principle steps:

get bounding box of the polygon
for x = boundingbox.min.x to boundingbox.max.x by your x-stepsize
for y = boundingbox.min.y to boundingbox.max.y by your y-stepsize
here is a new xy-coordinate (like that of an array command)
xnew = x + random value (within a tolerance to the left/right, positive or negative)
ynew = y + random value (within a tolerance to the left/right, positive or negative)
that coordinate xnew/ynew is now more randomized, depending on a higher or lower tolerance value it look more like an array or more randomized
check if that new coordinate is inside the polygon
if yes ==> that's a new point
next y
next x

HTH, - alfred -

Re: Random block insertion into defined area

Anonymous — Tue, 29 Apr 2014 17:59:38 GMT

1. Insert one block

2. Use array to multiply the entire area

3. Use MAPCLEAN.Select objects / Duplicates / Desired minimum distance

4. Use MAPTRIM. Select Boundary/Select Objects/Trim Outside Boundary