MODEL.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
/* 
 *  model.c 
 *  This program demonstrates the use of OpenGL modeling  
 *  transformations.  Four triangles are drawn, each with  
 *  a different transformation. 
 */ 
#include "glos.h" 
 
#include <GL/gl.h> 
#include <GL/glu.h> 
#include <GL/glaux.h> 
 
void myinit(void); 
void draw_triangle(void); 
void CALLBACK display(void); 
void CALLBACK myReshape(GLsizei w, GLsizei 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 CALLBACK 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 CALLBACK myReshape(GLsizei w, GLsizei h) 
{ 
    if (!h) return; 
    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); 
} 
 
/*  Main Loop 
 *  Open window with initial window size, title bar,  
 *  RGBA display mode, and handle input events. 
 */ 
int main(int argc, char** argv) 
{ 
    auxInitDisplayMode (AUX_SINGLE | AUX_RGB); 
    auxInitPosition (0, 0, 500, 500); 
    auxInitWindow ("Modeling Transformations"); 
    myinit (); 
    auxReshapeFunc (myReshape); 
    auxMainLoop(display); 
    return(0); 
}