https://bugs.kde.org/show_bug.cgi?id=359805
Bug ID: 359805
Summary: strange loss of drawing precision in many
circumstances
Product: kig
Version: unspecified
Platform: Compiled Sources
URL: http://dmf.unicatt.it/~paolini/kig/bugs/
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: david.narv...@computer.org
Reporter: paol...@dmf.unicatt.it
In many cases the graphic drawing presents strange precision loss, like circles
that should go through the same point but they don't. Numerical error does not
explain the result.
In the web page above there is an example. An arc and a circle are constructed
such that
the circle is the support circle of the arc. They should be exactly
superposed, but they aren't
(zoom in an area of size approximately 1)
Please note that:
- if exported in png format the precision error is present
- if exported in SVG (or other vector formats) the result is instead CORRECT!
This suggests that the problem is not in the kig "calc" engine, but somewhere
else.
In my opinion this problems was not present in earlier kig versions (say kde2
or kde3),
but it is there since quite some time.
It is quite annoying...
Reproducible: Always
Steps to Reproduce:
1. Download "bug.kig" from the web page
2. Zoom around an end-point of the arc (near the origin) such that the window
size
is of order one
Actual Results:
The arc (thick line) is separated from the circle (thin line)
Expected Results:
The arc should be perfectly superposed with the circle
Numerical precision cannot be blamed, this example is not that extreme!
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