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FS#973 - Drawing outside zoom limit

Attached to Project: QCAD
Opened by Bram (bramerkelens) - Tuesday, 19 November 2013, 09:33 GMT+2
Last edited by Andrew (andrew) - Tuesday, 26 November 2013, 15:15 GMT+2
Task Type Bug Report
Category QCAD (main)
Status Closed
Assigned To Andrew (andrew)
Operating System Windows 7
Severity Medium
Priority Normal
Reported Version 3.4.2
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No


When a drawing is placed in X,Y coordinates QCAD is unable to zoom to the drawing.

We use X,Y coordinates like X=182,635,000 mm Y=579,005,000 mm for the location of the constructions.

If you use Auto Zoom you get to see a small dot on the screen but as soon as you try to zoom to the drawing QCAD jumps within a certain limit and you can’t get to the drawing.

This task depends upon

Closed by  Andrew (andrew)
Tuesday, 26 November 2013, 15:15 GMT+2
Reason for closing:  Fixed
Additional comments about closing:  https://github.com/qcad/qcad/commit/9d8c b1018854d506b06609b1e41e2c4bf649f89a
Comment by Andrew (andrew) - Tuesday, 19 November 2013, 09:45 GMT+2

This is a known limitation to prevent overflows and resulting from this artifacts on the screen.
This has to do with how values are stored in computers and with the underlying drawing system.
Creating small drawings at extreme locations should be avoided whenever possible since you also loose precision (the higher the magnitude of a value, the more it has to be rounded to store it).

Comment by Bram (bramerkelens) - Tuesday, 19 November 2013, 10:33 GMT+2

Can you give me the range off these limitations?

Comment by Andrew (andrew) - Tuesday, 19 November 2013, 10:44 GMT+2

Would it be possible to attach your file or send it by e-mail for testing?
It is possible to switch off these limits, but I'd have to test that to see if that works in your case (depends on the size and location of your drawing).

Comment by Bram (bramerkelens) - Tuesday, 19 November 2013, 11:07 GMT+2

I send you a email with the drawing.

Maybe it can be solved by giving the limits a origin from the UCS instead of GCS (see request #694)?