Re: [Gnuplot-info] gnuplot key colors

[Thomas S. <t.s...@fz...>]

try 'with linespoints' instead of 'with points', you will observe a funny
behaviour:
the lines in the keys are in the right color, the points are not.

the error is in 'graph3d.c':

with 'pm3d' the color of points and lines is taken from a color range,
depending
on the z-value of your data points (that's why some of your key points are
(nearly) black).

in 'key_sample_line_pm3d' this is the normal behaviour unless you specify a
rgb-color,
that's what you've done when defining your linestyles,
then the normal 'key_sample_line' is taken:

    /* If plot uses a constant color, set it here and then let simpler
routine take over */
    if (plot->lp_properties.use_palette &&
plot->lp_properties.pm3d_color.type == TC_RGB) {
   apply_pm3dcolor(&(plot->lp_properties.pm3d_color), term);
   key_sample_line(xl,yl);
   return;
    }

that's why the lines in the keys are right for 'linespoints'.

but in 'key_sample_point_pm3d' this distinction isn't done, so the points
are in a color
taken from a color range.

what you need to do is to patch 'key_sample_point_pm3d' with the following:

------------------------------------------ snip
-----------------------------------------
--- graph3d.c.orig      2007-03-14 16:58:16.000000000 +0100
+++ graph3d.c   2007-07-13 12:13:09.028182248 +0200
@@ -3171,6 +3171,12 @@
     if (steps < 2) steps = 2;
     step = ((double)(key_sample_right - key_sample_left)) / steps;
 
+    /* If plot uses a constant color, set it here and then let simpler
routine take over */
+    if (plot->lp_properties.use_palette &&
plot->lp_properties.pm3d_color.type == TC_RGB) {
+       key_sample_point(xl,yl,pointtype);
+       return;
+    }
+
     /* color gradient only over the cb-values of the surface, if smaller
than the
      * cb-axis range (the latter are gray values [0:1]) */
     get_surface_cbminmax(plot, &cbmin, &cbmax);
------------------------------------------ snip
-----------------------------------------


Alan Bromborsky wrote:
> 
> Using gnuplot 4.2.  I am plotting points with splot and distinguishing
> different sets of points by color alone.  When I use 'set key' the
> colors of the keys displayed does not match the colors of the points
> plotted.  I have attached the data file (powerflux.dat) and the gnuplot
> script file (powerflux.dat.plt).  Is there anyway to get the colors of
> the keys to match the colors of the plotted points?
> 
> set terminal x11 2
> set title "Spherical Power Flux"
> set xlabel "Azimuth"
> set ylabel "Elevation"
> set zlabel "Relative\nPower\nFlux"
> set xtics 60
> set mxtics 6
> set ytics 30
> set mytics 3
> set ticslevel 0
> set style line 1 lt rgb "red" lw 0 pt 1 ps 1
> set style line 2 lt rgb "green" lw 0 pt 1 ps 1
> set style line 3 lt rgb "yellow" lw 0 pt 1 ps 1
> set style line 4 lt rgb "blue" lw 0 pt 1 ps 1
> set style line 5 lt rgb "orange" lw 0 pt 1 ps 1
> set style line 6 lt rgb "light-green" lw 0 pt 1 ps 1
> splot [0:360][-90:90] "powerflux.dat" every :::0::0 using 1:2:3 with
> points linestyle 1 t "gen 2", \
> "powerflux.dat" every :::1::1 using 1:2:3 with points linestyle 2 t "gen
> 6", \
> "powerflux.dat" every :::2::2 using 1:2:3 with points linestyle 3 t "gen
> 7", \
> "powerflux.dat" every :::3::3 using 1:2:3 with points linestyle 4 t "gen
> 8", \
> "powerflux.dat" every :::4::4 using 1:2:3 with points linestyle 5 t "gen
> 10", \
> "powerflux.dat" every :::6::6 using 1:2:3 with points linestyle 6 t "gen
> 11"
> pause -1
> 
>  
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