Computer-Graphics/tw8.cpp at master · AkshayIyer12/Computer-Graphics · GitHub

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#include<stdlib.h>
#include<GL/glut.h>
GLfloat vertices[][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},
			{1.0,1.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0},
			{1.0,0.0,1.0},{1.0,1.0,1.0},{0.0,1.0,1.0}};
void polygon(int a, int b, int c, int d)
{
	glBegin(GL_POLYGON);
		glColor3fv(colors[a]);
		glVertex3fv(vertices[a]);
		glColor3fv(colors[b]);
		glVertex3fv(vertices[b]);
		glColor3fv(colors[c]);
		glVertex3fv(vertices[c]);
		glColor3fv(colors[d]);
		glVertex3fv(vertices[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 display(void)
{
	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 mouse(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();
	if(w<=h)
		glFrustum(-2.0,2.0,-2.0*(GLfloat)h/(GLfloat)w,2.0*(GLfloat)h/(GLfloat)w,2.0,20.0);
	else
		glFrustum(-2.0,2.0,-2.0*(GLfloat)w/(GLfloat)h,2.0*(GLfloat)w/(GLfloat)h,2.0,20.0);
	glMatrixMode(GL_MODELVIEW);
}


int main(int argc,char **argv)
{
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
	glutInitWindowSize(500,500);
	glutInitWindowPosition(0,0);
	glutCreateWindow("ColorCube Viewer");
	glutReshapeFunc(myReshape);
	glutDisplayFunc(display);
	glutMouseFunc(mouse);
	glutMainLoop();
}