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You are here:Open notes-->VTU-->CG-and-Visualisation-Lab10CSL67-Vtu-prg-8
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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