Re: [Gnuplot-info] How to dynamically specify color for drawing circle in Gnuplot4.3

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

rgbcolors are made of 3 components - red, green, and blue,
represented as hexadecimal values: #RRGGBB
the 3 color values are in the range 0-255, so the rgbcolor
as a decimal value is: 65536 * red + 256 * green + blue

you read in this decimal value in your plot command, a value
of '200' means that the red and green components are zero
- the number is too small - so the circle is blue.

some rgbcolor value examples:
red: 65536*255 = 16711680
green: 256*255 = 65280
blue: 255

instead of rgbcolors you could use a color palette:
plot ... linecolor palette ...


exprexxo wrote:
> 
> Here is another example without a file
> 
> set title "A Venn Diagram"
> unset border
> unset xtics
> unset ytics
> set size ratio -1
> set xrange [-10:10]
> set yrange [-10:10]
> plot '-' using 1:2:3:4 with circles lc rgb variable fs transparent solid
> 0.15 noborder
>  2 2 4 1
>  -2 2 5 200
>  0 -2  5 3
>  e
> 
> However I can not figure out what numbers I should be using for RGB other
> than 200 gives me blue.
> 

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