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C Library Functions  - circleprecision (3)

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NAME

circleprecision(3f) - [M_draw:ARCS] Set number of line segments used to approximate a circle (LICENSE:PD)

CONTENTS

Synopsis
Options
Examples
Image

SYNOPSIS

subroutine circleprecision(nsegs)

     integer,intent(in) :: nsegs

Set the number of line segments making up a circle. Default is currently 32. The number of segments in an arc or sector is calculated from the variable "nsegs" according to the span of the arc or sector.

OPTIONS

NSEGS	number of line segments making up a circle

EXAMPLES

Sample program:

   program demo_circleprecision
   use M_draw
   use M_draw,    only  : D_BLACK,   D_WHITE
   use M_draw,    only  : D_RED,     D_GREEN,    D_BLUE
   use M_draw,    only  : D_YELLOW,  D_MAGENTA,  D_CYAN
   implicit none
   real    :: b=0.5
   real    :: y1,y2,ym,x1,x2
   real    :: width=50.0/8.0,width2
   integer,parameter :: ivals(*)=[3,5,7,10,20,30,60,100]
   integer :: i
   integer :: ipaws
      !! set up long bar as plotting area
      call prefsize(1000,200)
      call vinit(’ ’) ! start graphics using device $M_DRAW_DEVICE
      call page(-25.0-b, 25.0+b, -5.0-b, 5.0+b)
      call textsize( 2.5/2.0, 3.0/2.0)
      call font(’futura.l’)
      call centertext(.true.)
      call linewidth(30)
      call color(D_GREEN)
      y1=-5
      y2=5
      ym=0
      x1=-25+.05*width
      ! draw colored rectangle and a circle and label center of circle repeat
      width2=width*0.95
      do i=1,size(ivals)
         x2=x1+width2
         call move2((x1+x2)/2.0,ym)
         call circleprecision(ivals(i))
         call print(ivals(i))     ! convert number to string and draw it
         call circle((x1+x2)/2.0, ym, (x2-x1)/2.10)
         x1=x1+width
      enddo
      ipaws=getkey()
      call vexit()
   end program demo_circleprecision

IMAGE

circles are drawn with various circle precision values.

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Nemo Release 3.1

circleprecision (3)

February 23, 2025

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