programming patterns in languagelevel 3

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5 total messages Started by Mike_LeFrancois Thu, 18 Dec 2003 16:19

#826

Author: Mike_LeFrancois
Date: Thu, 18 Dec 2003 16:19

24 lines
1918 bytes

I am writing code that produces a cross-section of various layers. To differentiate the layers I am trying to use various patterns such as: hatching with straight lines, diagonal lines, cross-hatching, circles, etc.. However, I am finding it difficult to create just evenly spaced vertical and horizontal lines. The following is a sample code that (I think should) produces a evenly spaced cross-hatching pattern, or grid type of pattern:

<< /PatternType 1 % Tiling pattern
        /PaintType 1 % Colored
        /TilingType 3
        /BBox [50 0 100 100]
        /XStep 10
        /YStep 10
        /PaintProc
        {
                pop % pop pattern dictionary
                %0.0 0.0 0.0 setrgbcolor
                72.0 72.0 scale 0 setlinewidth
                0 1 50 {0 moveto 0 11 rlineto} for
                0 1 50 {0 exch moveto 8 0 rlineto} for
                stroke
        } bind 

      > % End prototype pattern dictionary




This works on a standard page ok. However, when I try it on my drawing the cross-hatching comes out not evenly spaced. Any ideas? Also, does anybody know a good informational place to get postscript code in languatelevel 3 for producing such patterns. I still need to come up with circles and other various types of standard patterns. Thanks.

Re: programming patterns in languagelevel 3

#827

Author: Aandi_Inston
Date: Thu, 18 Dec 2003 17:44

3 lines
760 bytes

Are you making sure to call makepattern only once?

Aandi Inston

Re: programming patterns in languagelevel 3

#828

Author: Mike_LeFrancois
Date: Fri, 19 Dec 2003 16:31

7 lines
1215 bytes

yes, I am calling makepattern only once, but once for each pattern where I have three at the moment.

Actually, since I've posted the message I got the majority of the patterns to work. The trouble I found was with the BBox I had set and the XStep, YStep for the pattern spacing in the BBox. Though, at 100% visualization the lines don't look evenly spaced. However, if you zoom in they actually are.

Still, does anybody know a good place to find information on LanguageLevel 3 pattern algorithms for hatching and such????

Thanks for the reply by Aandi Inston..

Re: programming patterns in languagelevel 3

#829

Author: Mike_LeFrancois
Date: Fri, 19 Dec 2003 22:38

10 lines
1070 bytes

Does anybody know how to make angled cross hatching patterns?? I can't seem to make a negatively slopping line happen, only positive?

0 1 1{0 moveto 10 10 rlineto} for

will draw the positive slopes since dx,dy have values to change, but what is the needed code to make the lines go negative???

Also, dashes?? I though that
[3] 0 setdash was suppost to make dashed lines??

Any help would be greatly appreciated..

Re: programming patterns in languagelevel 3

#830

Author: Aandi_Inston
Date: Sat, 20 Dec 2003 10:15

16 lines
1554 bytes

>Does anybody know how to make angled cross hatching patterns?? I can't seem to make a negatively slopping line happen, only positive?
>
>0 1 1{0 moveto 10 10 rlineto} for
>
>will draw the positive slopes since dx,dy have values to change, but what is the needed code to make the lines go negative???

At its simplest you can make a mirror image with 1 -1 scale (but
remember to do everything below the origin).
>
>Also, dashes?? I though that
>[3] 0 setdash was suppost to make dashed lines??

Should do, provided you use stroke. Don't forget the dash size is
affected by the scale factor.

Aandi Inston

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