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Manual Reference Pages  - strlength (3)

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NAME

strlength(3f) - [M_pixel:TEXT] return length of string (LICENSE:PD)

CONTENTS

Synopsis
Description
Returns
Example
Author
License

SYNOPSIS

definition:

   function strlength(string)
   character(len=*),intent(in)    :: string

DESCRIPTION

Return the length of the string "STRING" in world units.

RETURNS

STRLENGTH
	length of string using current font size

EXAMPLE

Sample Program:

   program demo_strlength
   use :: M_pixel
   use :: M_writegif, only : writegif
   implicit none
   real    :: left
   real    :: baseline
   integer :: icolor=0
   real    :: texth=10.0
      !! set up drawing surface
      call prefsize(800, 400)
      call vinit()
      call viewport(0.0, 800.0, 400.0, 0.0)
      call ortho2(-100.0, 300.0, -100.0, 100.0)
      call color(7)
      call clear()
      call linewidth(30)
      call textsize(texth, texth)
      call xcentertext()
      call color(1)

      baseline=85.0
      call move2(0.0,baseline)
      call drawstr(’If I Can Stop One Heart’)
      baseline= baseline-texth*1.20
      call move2(0.0,baseline)
      call drawstr(’by Emily Dickinson’)
      call centertext(.false.)

      texth=8.5
      baseline=baseline-texth*1.50
      call textsize(texth, texth)
      left=-90.0

      call nextline(’If I can stop one heart from breaking,’)
      call nextline(’I shall not live in vain;’)
      call nextline(’If I can ease one life the aching,’)
      call nextline(’Or cool one pain,’)
      call nextline(’Or help one fainting robin’)
      call nextline(’Unto his nest again,’)
      call nextline(’I shall not live in vain.’)

      call writegif(’strlength.3m_pixel.gif’,P_pixel,P_colormap)
      call execute_command_line(’display strlength.3m_pixel.gif’)
      call vexit()
   contains
   subroutine nextline(string)
   character(len=*) :: string
   real :: xx
   !! reduce some duplicate code; very specific to this example
      call color(icolor)
      baseline=baseline-texth*1.5    ! move down before drawing line
      call makepoly()
      xx=strlength(string)
      call rect(left,baseline-texth*0.3,left+xx,baseline+texth)
      call closepoly()
      call color(7)
      call move2(left, baseline)
      call drawstr(string)    ! draw string
      icolor=icolor+1         ! set pen color
   end subroutine nextline

   end program demo_strlength

AUTHOR

John S. Urban

LICENSE

Public Domain

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strlength (3)

March 11, 2021

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