problem specifying fill color for boxes

[Corey Hickey]

Hello,

I want to make a bar chart and specify the color with which each bar is
filled. Here's a simplified version of what I have:

--------------------------------
set terminal png size 200,200
set style data boxes
set style fill solid 1 border -1
plot '-' using 1:2 lt rgb "blue"
1 0
2 4
3 30
e
--------------------------------

That works ok for me, except that I end up with a 1-pixel wide "shadow"
of blue pixels along the top and right edges of each bar, outside the
black outline. See the attached chart.png or 2x.png (size doubled with
imagemagick). Note also the thin blue line at X=1, where the Y value is 0.

I experimented a bit and determined that not all terminal types behave
this way. For example:

has a shadow:   png, gif, jpeg
without shadow: wxt, svg

So, am I specifying the color correctly? I can't find any other way to
do it.

I'm using Debian's gnuplot package, version 4.2.5-1; I also built 4.2.5
and CVS from source, and they both behave the same way.

Thanks,
Corey

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[Thomas Sefzick]

it's an error in 'graphics.c'

you can see the difference when plotting without color specification:
plot '-' using 1:2
there everthing is ok.

i'll upload a patch on sorceforge.

Corey Hickey wrote:

Hello,

I want to make a bar chart and specify the color with which each bar is
filled. Here's a simplified version of what I have:

--------------------------------
set terminal png size 200,200
set style data boxes
set style fill solid 1 border -1
plot '-' using 1:2 lt rgb "blue"
1 0
2 4
3 30
e
--------------------------------

That works ok for me, except that I end up with a 1-pixel wide "shadow"
of blue pixels along the top and right edges of each bar, outside the
black outline. See the attached chart.png or 2x.png (size doubled with
imagemagick). Note also the thin blue line at X=1, where the Y value is 0.

I experimented a bit and determined that not all terminal types behave
this way. For example:

has a shadow:   png, gif, jpeg
without shadow: wxt, svg

So, am I specifying the color correctly? I can't find any other way to
do it.

I'm using Debian's gnuplot package, version 4.2.5-1; I also built 4.2.5
and CVS from source, and they both behave the same way.

Thanks,
Corey

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royalty-free distribution of the report engine for externally facing
server and web deployment.
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[Corey Hickey]

Thomas Sefzick wrote:
> it's an error in 'graphics.c'
>
> you can see the difference when plotting without color specification:
> plot '-' using 1:2
> there everthing is ok.
>
> i'll upload a patch on sorceforge.

Thank you--I didn't know where in the source to look. I found your
description of the problem:
http://sourceforge.net/tracker/?func=detail&aid=2804784&group_id=2055&atid=302055

...and I made a patch (attached). It does seem to have an effect on the
svg terminal, though, and I don't know what would be correct.

Thanks,
Corey

--- gnuplot.orig/src/graphics.c 2009-06-11 19:29:45.000000000 -0700
+++ gnuplot/src/graphics.c 2009-06-11 19:29:52.000000000 -0700
@@ -5417,10 +5417,10 @@
     corner[0].x = x;
     corner[0].y = y;
     corner[1].x = x;
-    corner[1].y = y+h;
-    corner[2].x = x+w;
-    corner[2].y = y+h;
-    corner[3].x = x+w;
+    corner[1].y = y+h - 1;
+    corner[2].x = x+w - 1;
+    corner[2].y = y+h - 1;
+    corner[3].x = x+w - 1;
     corner[3].y = y;
 
     return corner;

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royalty-free distribution of the report engine for externally facing
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[Corey Hickey]

Thomas Sefzick wrote:
> it's an error in 'graphics.c'
>
> you can see the difference when plotting without color specification:
> plot '-' using 1:2
> there everthing is ok.
>
> i'll upload a patch on sorceforge.

I never thanked you for fixing this.

So... thank you! Sorry the thanks took so long. I hadn't realized the
fix was committed to CVS. I tested today's CVS and it works great.

-Corey

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