Re: [cgmo-webcgm] Review - lineOffset set.

[Lofton Henderson <lofton@rockynet.com>]

It sounds like this one should transition to "reworking" [1].

Regards,
-Lofton.

[1] ftp://ftp.cgmlarson.com/test-matrix.htm

At 11:16 AM 2/12/2009 -0700, Robert Orosz wrote:
>All,
>
>Below is my review of the lineOffset test.
>
>Regards,
>
>Rob
>Summary
>This test is not acceptable as it stands. There are issues with both the
>HTML markup and WebCGM profile, vide infra, but more importantly, I don't
>think the image as it stands makes a good test.
>Details
>The image consists of six groups of four lines. Each group has four lines
>with the line type and all other line attributes held constant, and the Line
>Type Initial Offset (LTIO) is varied with values of 0.0, 0.25, 0.5, and 0.75
>in each group. That is a good test. However, of the six groups, four use the
>standard line types 2, 3, 4, and 5. The exact rendering of these line types
>is implementation dependent. Therefore, any offset into the pattern no
>matter how precisely defined, will also be implementation dependent.
>The last two groups use Line and Edge Type defined line types. This is good,
>in fact I think sufficient for this test. I would like to see the image
>scaled a little larger, so it is easier to see. My suggestion would be to
>arrange the lines in each of the two test groups vertically across the
>entire image. Two or three pattern cycles should be sufficient for users to
>get the idea.
>The lines are pretty thick, just over 3.5 points. Looking at the PNG image
>in both Internet Explorer 6 and Internet Explorer 7 gives the impression
>that there are multiple line widths in the drawing, which is not the case. I
>would try much thinner lines, e.g. 00 or 000 points.
>There is no explanation in the image of exactly what the purpose of the red
>lines are. The long one obviously marks the origin of each of the lines in
>the test group, but there is no explanation of the purpose of the shorter
>lines. Looking closely, I see that they are spaced at dash cycle repeat
>length intervals. Instead of that, I think it would be more useful to have a
>line at 25%, 50%, 75% and 100% of the first dash cycle repeat length. In
>other words, each line would mark the beginning of the first complete
>pattern cycle after the origin for one of the lines in the group. They could
>be labeled and/or color-coded, so their purpose is clear.
>Finally, I would like to see a little more explanation in the HTML about
>what exactly is being tested and what to look for in a successful, i.e.
>passing, test.
>HTML Markup Violations
>There are several issues with the HTML markup that must be addressed; e.g.
>there is a CAPTION element as a direct child of the BODY. This element is
>only allowed as a child of TABLE (see
>http://www.w3.org/TR/html401/struct/tables.html#edef-CAPTION).
>WebCGM 2.0 Profile Violations
>There are two profile violations that must be addressed:
>1) The CGM contains a Text Precision element with a value of string (0).
>WebCGM (see T.20.11) only allows a value of stroke (2).
>2) The CGM does not have a Character Set List element in the Metafile
>Descriptor section. WebCGM (see T.16.14) requires this element for all
>metafiles containing graphical text.
>
>
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