On Sep 13, 2007, at 1:03 PM, Alan W. Irwin wrote:
> On 2007-09-12 21:32-0400 Hazen Babcock wrote:
>
>>
>> On Sep 12, 2007, at 12:29 AM, Hazen Babcock wrote:
>>
>> I think this should work now (v7863). However, the first test case in
>> example 28, "seven(a)", is perhaps a bit too much of test. It asks
>> for text that is drawn parallel to the x axis and also that the text
>> itself is parallel to the x axis, this means that its shear angle is
>> 90. The aqt driver just ignores such a large shear angle. The xcairo
>> driver crashes, at least with my OS-X cairo stack.
>
> The present "a" series has the s vector in the XY plane with
> constant Y
> component. That is sy = 0.2, sz = 0. with increasingly negative sx
> values
> starting at sx = 0. Thus, the vertical axis of each character in
> the "a"
> series should be parallel to the XY plane with the first one ("seven
> (a)")
> aligned with the pure Y direction. That is exactly what is
> displayed for
> "seven(a)", but for the remaining examples in the "a" series the
> vertical
> axes of the characters are not parallel with the XY plane. The
> problem is
> even more obvious if you change the example so that the various sx
> values
> are positive rather than negative; all the results do lie parallel
> with the
> XY plane, but the varying sx values are completely ignored so all
> the "a"
> series has the vertical axis of their characters parallel to the
> pure Y
> position with no X component.
Are you saying that all of the "a" series with sx >= 0.0 look the
same? I don't see that. Also I think it is pretty hard to tell from a
2D plot whether or not text lies in a particular plane, so it also is
not obvious to me that the sx <= 0.0 examples are in fact incorrect.
I drew the lines on the plot that the "a" series text (positive or
negative) was supposed to be parallel to and it looked like the text
was indeed parallel.
-Hazen
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