＜＜ 计算机图形学＞＞第2章样例程序

#include
#include
#include
#include

GLfloat angle =0.0;
GLfloat theta =0.0,vp=30.0;
GLfloat v[4][4],u[4][4];



typedef int edge[2];
typedef int face[4];
typedef GLfloat point3[3];

int myWin,w,h;
void myinit(void){
    //int i,j;
    glEnable(GL_DEPTH_TEST);
    glClearColor(0.6,0.6,0.6,1.0);
    
   
}


point3 vertices[8]={
    {-1.0,-1.0,-1.0},
    {-1.0,-1.0,1.0},
    {-1.0,1.0,-1.0},
    {-1.0,1.0,1.0},
    {1.0,-1.0,-1.0},
    {1.0,-1.0,1.0},
    {1.0,1.0,-1.0},
    {1.0,1.0,1.0}

    };


point3 nomals[6]={
    {-1.0, 0.0,0.0},
    {0.0, 0.0, 1.0},
    {0.0, 1.0, 0.0},
    {0.0, 0.0, -1.0},
    { 0.0, -1.0,0.0},
    {1.0, 0.0, 0.0}
   
   
      };

edge edges[24]={

{0,1},{1,3},{3,2},{2,0},
{0,4},{1,5},{3,7},{2,6},
{4,5},{5,7},{7,6},{6,4},
{1,0},{3,1},{2,3},{0,2},
{4,0},{5,1},{7,3},{6,2},
{5,4},{7,5},{6,7},{4,6}



};
face cubev[6]={

{0,1,2,3}, {5,9,18,13},
{14,6,10,19}, {7,11,16,15},
{4,8,17,12}, {22,21,20,23}


};


void cube(void){
    int face,edge;

    glBegin(GL_QUADS);
    for (face=0;face<6;face++)
        {glNormal3fv(nomals[face]);
        for (edge=0;edge<4;edge++)
            glVertex3fv(vertices[edges[cubev[face][edge]][0]]);}
    glEnd();
}

void setColor(float t) {
    float r,g,b;
    r=t*0.01;
    g=1-0.001*t*t;
    b=1-r;
    glColor3f(r,g,b);
}

void display(void){
    #define SCALE 10,0
    int i,j;GLfloat *p;
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glViewport(0,0,(GLsizei)w/2,(GLsizei)h);   
    printf("\n the matrixis:\t");
        glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glGetFloatv(GL_PROJECTION_MATRIX,u);
    gluPerspective(60.0,((float)w/2)/(float)h,1.0,300.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glGetFloatv(GL_MODELVIEW_MATRIX,v);
    gluLookAt(vp,vp/2.,vp/4.,0.0, 0.0, 0.0, 0.0, 0.0, 1.0);
    glPushMatrix();
    glRotatef(angle,0., 0., 1.0);
    glScalef(5.0,5.0,5.0);
    p=&v;
    for(i=0;i<16;i++)printf("\t %f",*p++);printf("\t End ofthe matrixis!\n");
    setColor(angle);
   
    cube();
   
    glPopMatrix();
   
   
   
    glutSwapBuffers();


   
}


void reshape(int width ,int high){
   
         w=width;h=high;
    glutPostRedisplay();
}




void iterationStep(void){
    if (angle>100)angle=0.0;
    angle+=0.1;
   
}

void animate(void){
    iterationStep();
    glutPostRedisplay();
}



int main(int argc,char** argv){
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB| GLUT_DEPTH);
    glutInitWindowSize(500,500);
    glutInitWindowPosition(50,50);
    myWin= glutCreateWindow("Temperature in bar");
    myinit();
       


    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutIdleFunc(animate);
    glutMainLoop();
}