Hi,
I think plcol0(0) doesn't "work", since you plot white on white (color
0, which is the background, was set to white by plscolbg()).
I normally do (this is C code; this must be done before the init() call!):
/* exchange black and white - background is white */
plscol0( 0, 255, 255, 255 ); /* White, color 0, background */
plscol0( 15, 0, 0, 0 ); /* Black, color 15 */
/* Initialize plplot */
plinit();
ans use color 15 if I want something in black:
plcol0( 15 );
pllab( "Energy [eV]", "Polar angle [deg]", "Transmission function" );
There is no need to call plscolbg() than anymore (in fact this function
calls plcol(0))
HTH,
Werner
Kåre Edvardsen wrote:
>
> How do I get a black plot on a white background. I can get about any
> color on a with background, except black. 'plcol0 (0)' does not work. Why???
>
> I'm using plplot (5.6.1) and perlDL. Here's my sampl code:
>
> use PDL;
> use PDL::Graphics::PLplot;
>
> $x = sequence 6;
> $y = $x ** 2;
>
> plsdev ("xwin");
> plscolbg (255,255,255); # Gives white bg
> plinit ();
>
> pladv (0);
> plvpor (0.15,0.85,0.1, 0.9);
> plwind (0.0,5.0,0.0,26.0);
>
> plbox (0,0,0,0,"bcnst","bcnst");
> plcol0 (0); # Does NOT give black, just gives nothing...
> plline ($x, $y);
>
> plend ();
>
>
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Dipl. Ing. Werner Smekal
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Technische Universitaet Wien
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