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/*
* (c) Copyright 1993, 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* Unpublished-- rights reserved under the copyright laws of the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(TM) is a trademark of Silicon Graphics, Inc.
*/
/*
* model.c
* This program demonstrates the use of OpenGL modeling
* transformations. Four triangles are drawn, each with
* a different transformation.
*/
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdlib.h>
void draw_triangle(void)
{
glBegin(GL_LINE_LOOP);
glVertex2f(0.0, 25.0);
glVertex2f(25.0, -25.0);
glVertex2f(-25.0, -25.0);
glEnd();
}
/* Clear the screen. For each triangle, set the current
* color and modify the modelview matrix.
*/
void display(void)
{
glClearColor (0.0, 0.0, 0.0, 1.0);
glClear (GL_COLOR_BUFFER_BIT);
glLoadIdentity ();
glColor3f (1.0, 1.0, 1.0);
draw_triangle ();
glEnable (GL_LINE_STIPPLE);
glLineStipple (1, 0xF0F0);
glLoadIdentity ();
glTranslatef (-20.0, 0.0, 0.0);
draw_triangle ();
glLineStipple (1, 0xF00F);
glLoadIdentity ();
glScalef (1.5, 0.5, 1.0);
draw_triangle ();
glLineStipple (1, 0x8888);
glLoadIdentity ();
glRotatef (90.0, 0.0, 0.0, 1.0);
draw_triangle ();
glDisable (GL_LINE_STIPPLE);
glFlush();
}
void myinit (void)
{
glShadeModel (GL_FLAT);
}
void myReshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h)
glOrtho (-50.0, 50.0, -50.0*(GLfloat)h/(GLfloat)w,
50.0*(GLfloat)h/(GLfloat)w, -1.0, 1.0);
else
glOrtho (-50.0*(GLfloat)w/(GLfloat)h,
50.0*(GLfloat)w/(GLfloat)h, -50.0, 50.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
}
int gl_width=500;
int gl_height=500;
void render_image(void)
{
myinit();
myReshape(gl_width,gl_height);
display();
}
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