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Manual Reference Pages  - page (3)

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NAME

page(3f) - [M_draw] set window into largest viewport available (LICENSE:PD)

CONTENTS

Synopsis
Description
Example
Author
License

SYNOPSIS

subroutine page(xsmall,xlarge,ysmall,ylarge) real, intent=(in) :: xsmall real, intent=(in) :: xlarge real, intent=(in) :: ysmall real, intent=(in) :: ylarge

subroutine page(xsize,ysize,icolor)

real, intent=(in)
	:: xsize
real, intent=(in)
	:: ysize integer, intent=(in) :: icolor

DESCRIPTION

FORM SUBROUTINE PAGE(XSMALL,XLARGE,YSMALL,YLARGE)

Set the window to the rectangle defined by the corner points <xsmall,ysmall> and <xlarge,ylarge>.

Also, given the window size, and assuming a one-to-one correspondence of window units (ie. an "x-unit" is as long as a "y-unit"), find the largest area on the display surface that has the same aspect ratio, and set the viewport to it.

FORM SUBROUTINE PAGE(XSIZE,YSIZE,ICOLOR)

Size the window to the rectangle defined by the corner points <0.0,0.0> and <xsize,ysize> and the viewport to the largest centered area that has the same aspect ratio, and set the background color to the value mapped to color ICOLOR.

EXAMPLE

Sample program:

   program demo_page
   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
   integer :: ipaws
   real,parameter :: radius=25.0
      call prefsize(600,600)
      call vinit(’ ’) ! start graphics using device $M_draw_DEVICE
      call page(-radius, radius, -radius, radius)
      call linewidth(200)
      call clear()
      call color(D_BLUE)
      call move2(-radius, -radius)
      call draw2(-radius, radius)
      call draw2(radius, radius)
      call draw2(radius, -radius)
      call draw2(-radius, -radius)
      call color(D_CYAN)
      call circle(0.0,0.0,radius)
      call vflush()
      ipaws=getkey()
      call vexit()
   end program demo_page

AUTHOR

John S. Urban

LICENSE

Public Domain

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page (3)

March 11, 2021

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