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C Library Functions  - color (3)

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NAME

color(3f) - [M_pixel:COLOR] set current color index (LICENSE:PD)

CONTENTS

Synopsis
Description
Option
Examples
Author
License

SYNOPSIS

definition:

   subroutine color(col)
   integer,intent(in) :: col

DESCRIPTION

Set the current color. The standard colors are as follows:

      black  =  0  red      =  1  green  =  2  yellow  =  3
      blue   =  4  magenta  =  5  cyan   =  6  white   =  7

OPTION

COL	A color number from 0 to 255. To define additional colors see mapcolor(3f).

EXAMPLES

Sample program:

    program demo_color
    use M_pixel
    use M_pixel__writegif, only : writegif
    implicit none
    real    :: b=0.5
    real    :: y1,y2,ym,x1,x2
    real    :: width=50.0/8.0,width2
    integer :: i
       !-! set up long bar as plotting area
       call prefsize(1000,200)
       call vinit()
       call ortho2(-25.0-b, 25.0+b, -5.0-b, 5.0+b)
       call textsize( 3.5, 4.0)
       call font(’DUPLEX’)
       call centertext(.true.)
       call linewidth(90)
       y1=-5
       y2=5
       ym=0
       x1=-25+.05*width
       ! draw colored rectangle and a circle and label center of circle
       ! and repeat from colors 0 to 7.
       width2=width*0.95
       do i=0,7
          call color(i)
          x2=x1+width2
          call makepoly()
          call rect(x1,y1,x2,y2)
          call closepoly()
          call color(i+1)
          call move2((x1+x2)/2.0,ym)
          call drawstr(i)     ! convert number to string and draw it
          call circle((x1+x2)/2.0, ym, (x2-x1)/2.10)
          x1=x1+width
       enddo
       ! write plot as GIF file
       call writegif(’color.3m_pixel.gif’,P_pixel,P_colormap)
       call vexit()
       ! use system to display GIF file
       call execute_command_line(’display color.3m_pixel.gif’)
    end program demo_color

AUTHOR

John S. Urban

LICENSE

Public Domain

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Nemo Release 3.1

color (3)

June 29, 2025

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