How to draw polygon in c programming language using openGL utility toolkit like glut and glew

Polygon

code:

	//necessary header
	#include<stdlib.h>
	#include<math.h>
	#include<Windows.h>
	//Opengl utilities
	#include <GL\glew.h>
	#include<GL/GLU.h>
	#include<GL/GL.h>
	#include <GL\freeglut.h>
	//function initialization and definition
	void display(void) {
	//clearing all pixel
	glClear(GL_COLOR_BUFFER_BIT);
	//draw white polygon (rectangle) with corner at (0.25,0.25, 0.0) and (0.75,0.75,0.0)
	glColor3f(1.0,1.0,1.0);
	glBegin(GL_POLYGON);
	glVertex3f(0.25,0.25,0.0);
	glVertex3f(0.75,0.25,0.0);
	glVertex3f(0.75,0.75,0.0);
	glVertex3f(0,1,0);
	glVertex3f(0.25,0.75,0.0);
	glEnd();
	//start processing openGL routine
	glFlush();
	}
	void init(void) {
	//for background
	glClearColor(0.0,0.0,0.0,0.0);
	//initializing viewing values
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	// left, right, buttom, top, zNear, zFar
	glOrtho(0.0,1.0,0.0,1.0,-1.0,1.0);
	}
	//main function
	//declare initial window size, position, and display mode (single buffered and RBGA)
	//open window with "Polygon" in title bar
	//call initialization routine
	//register call back function
	//enter main loop and process event
	int main(int argc, char* argv[]) {
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
	glutInitWindowSize(250,250);
	glutInitWindowPosition(100,100);
	glutCreateWindow("Polygon");
	init();
	glutDisplayFunc(display);
	glutMainLoop();
	return(0);
	}

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How to draw triangle in c programming language using openGL utilities like glut and glew

Triangle in openGL

code:

	//necessary header
	#include<stdlib.h>
	#include<math.h>
	#include<Windows.h>
	//Opengl utilities
	#include <GL\glew.h>
	#include<GL/GLU.h>
	#include<GL/GL.h>
	#include <GL\freeglut.h>
	//function
	void render(void) {
	//clear
	glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);
	//reset
	glLoadIdentity();
	//each pixel size
	glPointSize(100.0);
	//draw things
	glBegin(GL_TRIANGLES);
	glColor3f(1,0,0);
	glVertex2f(-0.5, -0.5);
	glColor3f(0,1,0);
	glVertex2f(0.5, -0.5);
	glColor3f(0,0,1);
	glVertex2f(0, 0.5);
	glEnd();
	//display for swaping buffer yield smooth animation
	glutSwapBuffers();
	}
	void initBackground() {
	glClearColor(0.0, 0.0, 0.0, 1);
	glColor3f(1.0, 1.0, 1.0);
	}
	void keyboard( unsigned char c, int x, int y) {
	if (c == 'a') {
	exit(0);
	}
	}
	void mouse(int buttom, int state, int x, int y) {
	if (buttom == GLUT_RIGHT_BUTTON) {
	exit(0);
	}
	}
	//main function
	int main( int argc, char* argv[]) {
	//openGL initialization code (optional)
	glutInit(&argc, argv);
	//Specify the display mode -RBG or color index, single or double buffer
	glutInitDisplayMode(GLUT_DEPTH | GLUT_RGBA | GLUT_DOUBLE);
	//Creating window named "Triangle in openGL"
	//with starting point (100,100)
	//with screen resolution 640*480
	glutInitWindowPosition(100,100);
	glutInitWindowSize(640, 480);
	glutCreateWindow("Triangle in openGL");
	//Register the call back functions
	glutDisplayFunc(render);
	glutKeyboardFunc(keyboard);
	glutMouseFunc(mouse);
	//for changing background properties
	initBackground();
	//Program goes into infinite loop waiting for events
	glutMainLoop();
	return 0;
	}

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How to draw Wired cube in c programming using openGL glut and glew utility toolkit

Wired Cube

code:

	//necessary header
	#include<stdlib.h>
	#include<math.h>
	#include<Windows.h>
	//Opengl utilities
	#include <GL\glew.h>
	#include<GL/GLU.h>
	#include<GL/GL.h>
	#include <GL\freeglut.h>
	//function initialization and definition
	void init(void) {
	glClearColor(0.0,0.0,0.0,0.0);
	glShadeModel(GL_FLAT);
	}
	void diplay(void) {
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0,1.0,1.0);
	//clear the matrix
	glLoadIdentity();
	//viewing transformation
	gluLookAt(0.0,0.0,5.0,0.0,0.0,0.0,0.0,1.0,0.0);
	//modeling transforming
	glScalef(1.0,2.0,1.0);
	glColor3f(1, 0, 0);
	glutWireCube(2);
	glFlush();
	}
	void reshape(int w, int h) {
	glViewport(0,0,GLsizei(w), GLsizei(h));
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glFrustum(-1.0,1.0,-1.0,1.0,1.5,20);
	glMatrixMode(GL_MODELVIEW);
	}
	int main(int argc, char* argv[]) {
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
	glutInitWindowSize(500,500);
	glutInitWindowPosition(100,100);
	glutCreateWindow("Transformed Cube");
	init();
	glutDisplayFunc(diplay);
	glutReshapeFunc(reshape);
	glutMainLoop();
	return(0);
	}

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