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Manual Reference Pages  - arc (3)

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NAME

arc(3f) - [M_pixel:ARCS] draw an arc using current line width and color (LICENSE:PD)

CONTENTS

Synopsis
Description
Options
Example
Author
License

SYNOPSIS

definition:

   subroutine arc(x, y, radius, startang, endang)
   real,intent(in) :: x
   real,intent(in) :: y
   real,intent(in) :: radius
   real,intent(in) :: startang
   real,intent(in) :: endang

DESCRIPTION

Draw an arc. x, y, and radius are values in world units.

Angles are in degrees, positive measured counterclockwise from the +X axis. The current position after the arc is drawn is at the end of the arc.

OPTIONS

X,Y	Coordinates for the center of the circle
RADIUS	Radius of the circle
STARTANG
	Start angle
ENDANG	End angle

EXAMPLE

Sample program:

   program demo_arc
   use M_pixel
   use M_writegif, only : writegif
   implicit none
   integer  :: transparent=0
      call prefsize(600,240)
      call vinit()
      call ortho2(0.0,60.0,0.0,24.0)
      call linewidth(400)
      call color(1)
      call arc(16.0,12.0,12.0,90.0,270.0)
      call color(2)
      call arc(44.0,12.0,12.0,-90.0,90.0)
      ! write gif with a transparent background
      call writegif(’arc.3m_pixel.gif’,P_pixel,P_ColorMap,transparent)
      call vexit()
   end program demo_arc

AUTHOR

John S. Urban

LICENSE

Public Domain

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arc (3)

March 11, 2021

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