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#
# Copyright (c) 1993-1997, Silicon Graphics, Inc.
# ALL RIGHTS RESERVED
# Permission to use, copy, modify, and distribute this software for
# any purpose and without fee is hereby granted, provided that the above
# copyright notice appear in all copies and that both the copyright notice
# and this permission notice appear in supporting documentation, and that
# the name of Silicon Graphics, Inc. not be used in advertising
# or publicity pertaining to distribution of the software without specific,
# written prior permission.
#
# THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
# AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
# INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
# FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
# GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
# SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
# KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
# LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
# THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
# ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
# POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
#
# US Government Users Restricted Rights
# Use, duplication, or disclosure by the Government is subject to
# restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
# (c)(1)(ii) of the Rights in Technical Data and Computer Software
# clause at DFARS 252.227-7013 and/or in similar or successor
# clauses in the FAR or the DOD or NASA FAR Supplement.
# Unpublished-- rights reserved under the copyright laws of the
# United States. Contractor/manufacturer is Silicon Graphics,
# Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
#
# OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
#/
#
# planet.c
# This program shows how to composite modeling transformations
# to draw translated and rotated models.
# Interaction: pressing the d and y keys (day and year)
# alters the rotation of the planet around the sun.
#/
require "opengl"
require "glut"
require "rational"
STDOUT.sync = TRUE
$year = 0; $day = 0;
def init
GL.ClearColor(0.0, 0.0, 0.0, 0.0);
GL.ShadeModel(GL::FLAT);
end
display = Proc.new {
GL.Clear(GL::COLOR_BUFFER_BIT);
GL.Color(1.0, 1.0, 1.0);
GL.PushMatrix();
GLUT.WireSphere(1.0, 20, 16); # draw sun */
GL.Rotate($year, 0.0, 1.0, 0.0);
GL.Translate(2.0, 0.0, 0.0);
GL.Rotate($day, 0.0, 1.0, 0.0);
GLUT.WireSphere(0.2, 10, 8); # draw smaller planet */
GL.PopMatrix();
GLUT.SwapBuffers();
}
reshape = Proc.new { |w, h|
GL.Viewport(0, 0, w, h);
GL.MatrixMode(GL::PROJECTION);
GL.LoadIdentity();
GLU.Perspective(60.0, w.to_f/h.to_f, 1.0, 20.0);
GL.MatrixMode(GL::MODELVIEW);
GL.LoadIdentity();
GLU.LookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
}
# ARGSUSED1 */
keyboard = Proc.new {|key, x, y|
case (key)
when 'd'[0]
$day = ($day + 10) % 360;
GLUT.PostRedisplay();
when 'D'[0]
$day = ($day - 10) % 360;
GLUT.PostRedisplay();
when 'y'[0]
$year = ($year + 5) % 360;
GLUT.PostRedisplay();
when 'Y'[0]
$year = ($year - 5) % 360;
GLUT.PostRedisplay();
when 27
exit(0);
end
}
GLUT.Init
GLUT.InitDisplayMode(GLUT::DOUBLE | GLUT::RGB);
GLUT.InitWindowSize(500, 500);
GLUT.InitWindowPosition(100, 100);
GLUT.CreateWindow($0);
init();
GLUT.DisplayFunc(display);
GLUT.ReshapeFunc(reshape);
GLUT.KeyboardFunc(keyboard);
GLUT.MainLoop();
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