# # 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 # Unpublished-- rights reserved under the copyright laws of the # United States.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. #/ # # double.c # This is a simple double buffered program. # Pressing the left mouse button rotates the rectangle. # Pressing the middle mouse button stops the rotation. #/ require "opengl" require "glut" require "rational" $spin = 0.0; display = Proc.new { GL.Clear(GL::COLOR_BUFFER_BIT); GL.PushMatrix(); GL.Rotate($spin, 0.0, 0.0, 1.0); GL.Color(1.0, 1.0, 1.0); GL.Rect(-25.0, -25.0, 25.0, 25.0); GL.PopMatrix(); GLUT.SwapBuffers(); } $spinDisplay = Proc.new { $spin = $spin + 4.0; $spin = $spin - 360.0 if ($spin > 360.0) GLUT.PostRedisplay(); } def init GL.ClearColor(0.0, 0.0, 0.0, 0.0); GL.ShadeModel(GL::FLAT); end reshape = Proc.new {|w, h| GL.Viewport(0, 0, w, h); GL.MatrixMode(GL::PROJECTION); GL.LoadIdentity(); GL.Ortho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0); GL.MatrixMode(GL::MODELVIEW); GL.LoadIdentity(); } mouse = Proc.new {|button, state, x, y| case button when GLUT::LEFT_BUTTON GLUT.IdleFunc($spinDisplay) if (state == GLUT::DOWN) when GLUT::MIDDLE_BUTTON GLUT.IdleFunc(nil) if (state == GLUT::DOWN) end } # # Request double buffer display mode. # Register mouse input callback functions #/ GLUT.Init GLUT.InitDisplayMode(GLUT::DOUBLE | GLUT::RGB); GLUT.InitWindowSize(250, 250); GLUT.InitWindowPosition(100, 100); GLUT.CreateWindow($0); init(); GLUT.DisplayFunc(display); GLUT.ReshapeFunc(reshape); GLUT.MouseFunc(mouse); GLUT.MainLoop();