DXF coordinates problem (import)

Hi there,

I'm working on a DXF import in a Delphi project. I have a complete
parser and am able to read some really big drawings already. However, I
have one problem I cannot figure out, which I only see in a trainstation
DXF file I have. It manifests itself in two ways, both resulting in
entities being drawn in the wrong place:

1) Some circles have center point coordinates which are outside the
defined space ($extmin, $extmax). I figured that maybe for some stupid
reason I should invert the values if they fall outside the extmin,
extmax boundries and that seemed to work, but only for the x axis.

so in my original code

.......
center_point.x := c_x;
center_point.y := c_y;
center_point.z := c_z;
.......

I inserted this

if c_x < pParent.FHeaderInfo.ExtMin.x then
c_x := -c_x;

and then the circles fall in exactly the right place (maybe that is a
coincidence). However, when I make it more consistent code and add a

if c_y < pParent.FHeaderInfo.ExtMin.y then
c_y := -c_y;
if c_z < pParent.FHeaderInfo.ExtMin.z then
c_z := -c_z

as well, some circles end up on the other end of the screen

2) Some circles and arcs end up in the wrong place, but fall inside the
extmin, extmax boundries. I am completely clueless why this happens.

Some extra info: In both cases I have parsed the coordinates correct (I
checked them manually), the entities are not inside a block or anything
else and the layer on which they reside is visible and not frozen. Most
of the entities on the same layer are in the correct place...

Not every element is implemented in my engine yet, DXF is just too damn
big to completely and perfectly implement. So the problem may be that I
didn't handle some element, which translates the coordinate system in
some way.

Does anyone have a clue to what my problem is? You would make me a happy
camper!

Thanks,

Lodewijk Bogaards.