Transform

Well, you've not said what you're doing. You've just said you're using dbTransform (and there isn't a function called that), without any clue as to what the arguments are. Then you just listed a list with the expanded view of an instance and a polygon. I've no idea what the "xy" of a polygon means - a polygon is made up of a series of points.

If you're more explicit about what you're doing - ideally with code and the output it generates - it might be easier to help you. Since the dbTransformPoint() function is pretty simple (if that's what you're using), and widely used, it's very likely to be something you're doing wrong in your code.

Best Regards,

Andrew.

In the code I have a LayercyclicField where by selecting a layer from that field I calculate the union of all the
bBox of that layer. But for polygons it si not giving expected output. Sample inputs have been given in the forum.
I hope this helps. Let me know if anything else is required.

Yes Andrew I mean dbTransformPoint(). And by xy I mean llx:lly of the polygon.
I used the command with the following arguments.
dbTransformPoint(1.145:0.505 list(16.388:4.46 "R0" 1.0))
output: (17.533 4.965)
But the output should be 15.9:1.36

Thanks.

Well, it's been a while since I did maths at school, but last time I looked 1.145+16.388=17.533 and 0.505+4.46=4.965.

So I cannot see how you can possibly expect 15.9:1.36?

If I assume you're trying to transform all the points in the polygon by the "transform" of the instance (rather than the lower left of the instance's bbox), then that would be:

foreach(mapcar point polygon~>points dbTransformPoint(point inst~>transform))

and that gives:

((18.27 5.97)
(18.19 5.97)
(18.19 6.63)
(18.27 6.63)
(18.27 7.92)
(18.15 7.92)
(18.15 8.16)
(18.0 8.16)
(18.0 5.265)
(18.15 5.265)
(18.15 5.52)
(18.27 5.52)
)

So I can't work out where you get 15.9:1.36 from!

Regards,

Andrew.

Ok I was looking at the wrong instance. its ok. Nothing wrong with the command.

Thanks,