CG and Visualisation Lab(10CSL67) Vtu prg-8

/* Lab Program 8 */ /* Program to draw a color cube and allow the user to move the camera suitably to experiment with perspective viewing. Use OpenGL functions */

#include<stdlib.h>

#include<GL/glut.h>

GLfloat ver[][3]={{-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}};

GLfloat colors[][3]={{0.0,0.0,0.0},{1.0,0.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0},{1.0,1.0,0.0},{1.0,0.0,1.0},{0.0,1.0,1.0},{1.0,1.0,1.0}};

void polygon(int a,int b,int c,int d) {

glBegin(GL_POLYGON);

glColor3fv(colors[a]);

glVertex3fv(ver[a]);

glColor3fv(colors[b]);

glVertex3fv(ver[b]);

glColor3fv(colors[c]);

glVertex3fv(ver[c]);

glColor3fv(colors[d]);

glVertex3fv(ver[d]);

glEnd();

}

void colorcube() {

polygon(0,3,2,1);

polygon(2,3,7,6);

polygon(0,4,7,3);

polygon(1,2,6,5);

polygon(4,5,6,7);

polygon(0,1,5,4);

}

static GLfloat theta[]={0.0,0.0,0.0};

static GLint axis=2;

static GLdouble viewer[]={0.0,0.0,5.0};

/*void spincube() {

theta[axis]+=2.0;

if(theta[axis]>360.0) theta[axis]-=360.0;

glutPostRedisplay();

}*/

void display() {

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glLoadIdentity();

gluLookAt(viewer[0],viewer[1],viewer[2],0.0,0.0,0.0,0.0,1.0,0.0); glRotatef(theta[0],1.0,0.0,0.0);

glRotatef(theta[1],0.0,1.0,0.0);

glRotatef(theta[2],0.0,0.0,1.0);

colorcube();

glFlush();

glutSwapBuffers();

}

void mymouse(int btn,int state,int x,int y) { if(btn==GLUT_LEFT_BUTTON&&state==GLUT_DOWN) axis=0; if(btn==GLUT_MIDDLE_BUTTON&&state==GLUT_DOWN) axis=1; if(btn==GLUT_RIGHT_BUTTON&&state==GLUT_DOWN) axis=2;

theta[axis]+=2.0;

if(theta[axis]>360.0) theta[axis]-=360.0; display(); }

void keys(unsigned char key,int x,int y) {

if(key=='X') viewer[0]-=1.0;

if(key=='x') viewer[0]+=1.0;

if(key=='Y') viewer[1]-=1.0;

if(key=='y') viewer[1]+=1.0;

if(key=='Z') viewer[2]-=1.0;

if(key=='z') viewer[2]+=1.0;

display();

}

void myReshape(int w,int h) {

glViewport(0,0,w,h);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluPerspective(50.0,w/h,1.0,10.0);

glMatrixMode(GL_MODELVIEW);

}

int main(int argc ,char **argv) {

glutInit(&argc,argv);

glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);

glutInitWindowSize(500,500);

glutCreateWindow("colorCube");

glutReshapeFunc(myReshape);

glutDisplayFunc(display);

glutSpinFunc(spincube);

glutMouseFunc(mymouse);

glutKeyboardFunc(keys);

glEnable(GL_DEPTH_TEST);

glutMainLoop();

return 0;

}

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