Manual Reference Pages - window (3)
NAME
window(3f) - [M_draw:PROJECTION] Specify a perspective viewing pyramid (LICENSE:PD)
CONTENTS
Synopsis
Description
Example
SYNOPSIS
subroutine window(left, right, bot, top, near, far) real left, right, bot, top, near, far
DESCRIPTION
Specify a perspective viewing pyramid in world coordinates by giving the rectangle closest to the eye (ie. at the near clipping plane) and the distances to the near and far clipping planes.
EXAMPLE
Sample program:
program demo_windows use M_draw integer CUBE, TOPLEFT, TOPRIGHT, BOTTOMLEFT, BOTTOMRIGHT parameter(CUBE = 1, TOPLEFT = 2, TOPRIGHT = 3, BOTTOMLEFT = 4, BOTTOMRIGHT = 5) character(len=20) :: device print*,’Enter device name:’ read(*,’(A)’,iostat=ios)device if(ios.ne.0)device=’ ’ call vinit(device) call pushviewport call textsize(0.5, 0.9) call font(’futura.m’) call color(D_BLACK) call clear ! make an object that represents the cube call makecube ! set up an object which draws in the top left of the screen. call makeobj(TOPLEFT) call viewport(-1.0, 0.0, 0.0, 1.0) call ortho2(-5.0, 5.0, -5.0, 5.0) call color(D_RED) call rect(-5.0, -5.0, 5.0, 5.0) call perspective(40.0, 1.0, 0.1, 1000.0) call lookat(5.0, 8.0, 5.0, 0.0, 0.0, 0.0, 0.0) ! Call an object within another object call callobj(CUBE) call color(D_GREEN) call move2(-4.5, -4.5) call drawstr(’perspective/lookat’) call closeobj ! now set up one which draws in the top right of the screen call makeobj(TOPRIGHT) call viewport(0.0, 1.0, 0.0, 1.0) call ortho2(-5.0, 5.0, -5.0, 5.0) call color(D_GREEN) call rect(-5.0, -5.0, 5.0, 5.0) call window(-5.0, 5.0, -5.0, 5.0, -5.0, 5.0) call lookat(5.0, 8.0, 5.0, 0.0, 0.0, 0.0, 0.0) call callobj(CUBE) call color(D_RED) call move2(-4.5, -4.5) call drawstr(’window/lookat’) call closeobj ! try the bottom left call makeobj(BOTTOMLEFT) call viewport(-1.0, 0.0, -1.0, 0.0) call ortho2(-5.0, 5.0, -5.0, 5.0) call color(D_MAGENTA) call rect(-5.0, -5.0, 5.0, 5.0) call perspective(40.0, 1.0, 0.1, 1000.0) call polarview(15.0, 30.0, 30.0, 30.0) call callobj(CUBE) call color(D_YELLOW) call move2(-4.5, -4.5) call drawstr(’perspective/polarview’) call closeobj ! and the bottom right call makeobj(BOTTOMRIGHT) call viewport(0.0, 1.0, -1.0, 0.0) call ortho2(-5.0, 5.0, -5.0, 5.0) call color(D_CYAN) call rect(-5.0, -5.0, 5.0, 5.0) call window(-5.0, 5.0, -5.0, 5.0, -5.0, 5.0) call polarview(8.0, -18.0, -3.0, 18.0) call callobj(CUBE) call color(D_BLUE) call move2(-4.5, -4.5) call drawstr(’window/polarview’) call closeobj ! now draw them call callobj(TOPLEFT) call callobj(TOPRIGHT) call callobj(BOTTOMLEFT) call callobj(BOTTOMRIGHT) idum=getkey() call vexit !===================================================================== contains !===================================================================== subroutine makecube ! set up a cube integer CUBE parameter (CUBE = 1) call makeobj(CUBE) ! The border around the cube call rect(-5.0, -5.0, 10.0, 10.0) ! Make the cube from 4 squares call pushmatrix() call side() call rotate(90.0, ’x’) call side() call rotate(90.0, ’x’) call side() call rotate(90.0, ’x’) call side() call popmatrix() call closeobj() end subroutine makecube !===================================================================== subroutine side ! define a face for the cube call pushmatrix call translate(0.0, 0.0, 1.0) call rect(-1.0, -1.0, 1.0, 1.0) call popmatrix end subroutine side !===================================================================== end program demo_windows
| window (3) | March 11, 2021 |
