Figure 28

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Figure 28
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/*
//Author: Cheikh Drame
//To support, please do one of the following
//- Visit irap123.com many times a day
//- Join irap123.com
//- Buy my app irap123 (rhyming dictionary) available for android, and iphone. On windows phone, it is called iLyrics. If not, you can get the desktop version at www.irap123.com/apps/webstore/
//- Include irap123.com in your blogs, forums, facebook walls, email footers, comments
//- send a donation at my paypal address at cbdsigned.vevo@gmail.com
//- Buy a story at http://shop.pparzygnat.com
*/

// HermannGridIllusion.cpp : Defines the entry point for the console application.
////author: Cheikh Drame
//class: Research
//focus: Computer Graphics using openGL


#include
#include

const int WIDTH=320, HEIGHT=320;

void display()
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0,0,0);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

glBegin(GL_QUADS);
const int W=40, D=20;
int x1=D, y1=D, x2=x1+W, y2=y1, x3=x2, y3=y2+W, x4=x1, y4=y1+W;
for(int j=0; j<5; ++j){//this loop makes sure that it goes to the next line for another set of squares
for(int i=0; i<5; ++i){//this loop draws 5 squares horizontally
glVertex2i(x1, y1); glVertex2i(x2,y2); glVertex2i(x3, y3); glVertex2i(x4,y4);
x1=x2+D; x2=x1+W; x3=x2; x4=x3-W;
}
x1=D; y1=y4+D; x2=x1+W; y2=y1; x3=x2; y3=y2+W; x4=x1; y4=y1+W;
}

glEnd();

glFlush();
}
void main(int argc, char**argv)
{
glutInit(&argc, argv);
// glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowSize(WIDTH, HEIGHT);
glutInitWindowPosition(200,100);
glutCreateWindow("sample Prog: Points by irap123.com");
glClearColor(1.0,1.0,1.0,0.0);
gluOrtho2D(0.0, WIDTH, HEIGHT, 0.0);
glutDisplayFunc(display);
glutMainLoop();
}