Re: few remarks

[Daniel J S. <dan...@ie...>]

Ethan Merritt wrote:

>On Monday 09 August 2004 11:04 pm, mi...@ph... wrote:
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>>Bug:
>>On x11 (well, I haven't look to other terminals), points in the points and
>>linepoints styles are "handicapped" -- look by a screen magnificator (xmag,
>>kmag) to points obtained by:
>>
>>set size ratio 1
>>plot sin(x)/x w point pt 2
>>    
>>
>
>That is one strange bug you have found.  The odd thing is that it seems
>to be a bug in the X server.   I can run the same gnuplot_x11 executable
>on two different machines and get two different results.  My best guess
>at the moment is that the key difference is which version of X11 is
>running, although it is also possible that it is a difference in the video
>driver rather than the version.  The issue is whether the rendering
>engine does, or does not, draw the final pixel in a line segment that is
>at 45 degrees. Changing the drawing style from CapButt to CapRound
>while drawing points fixes this, at least on the machines I have tested.
>I can't think of any bad effects from this so I will make the change.
>I'm sure someone will speak up if it uncovers some complementary
>bug on other X11 display setups.
>
>Meanwhile I notice that the aspect ratio of the plot symbols
>scales with that of the current x11 window.  This seems ugly to me,
>so I propose to also change the code so that the cross/plus/star/etc
>always has a 1:1 aspect ratio, even if the plot in which it lies does not.
>

I'm seeing the same kind of thing for the + (pluses) as well as the 
crosses.  It appears like the last pixel is not being drawn.  This *is* 
very odd.  How could this have gone unnoticed when who every programmed 
it, programmed it?

Dan

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