//#include<windows.h>
//#include<iostream.h>
//#include<stdio.h>
//#include<stdlib.h>
//#include<string.h>
//#include<math.h>
//#include<GL/gl.h>
//#include<GL/glu.h>
//#include<GL/glut.h>
#include<windows.h>
#include<iostream.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
#include<GL/gl.h>
#include<GL/glu.h>
#include<GL/glut.h>
//const int screenWidth = 640*2;
//const int screenHeight = 480*2;
//GLdouble A,B,C,D; // values for scaling and shifting
void myInit(void)
{
glClearColor(1.0, 1.0, 1.0, 0.0); //background color is white
glColor3f(0.0f, 0.0f, 0.0f); //drawing color is black
glPointSize(4.0); //a dot is 2 by 2 pixels
//glLineWidth(4.0); //a line is 4 times thicker
//initialize view (simple orthographic projection)
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//glOrtho(-1.0,1.0,-1.0, 1.0, -1.0, 1.0);
// A = screenWidth/4.0; //Set values for scaling and shifting
// B= 0.0;
// C=D=screenHeight/2.0;
//set the viewing coordinates
gluOrtho2D(0.0, 640.0, 0.0, 480.0);
}
void myDisplay(void)
{
glClear(GL_COLOR_BUFFER_BIT); //clear the screen
// glRecti(10,10,150,60); //draw a rectangle with background color
glPointSize(2.0);
GLint h = 200,k = 200, x, y, r, d;
y = r = 100;
d = 3 – 2*r;
for(x=0; x<=y; x++)
{
glBegin(GL_POINTS);
{
glVertex2i(x+h,y+k);
glVertex2i(x+h,k-y);
glVertex2i(y+h,x+k);
glVertex2i(y+h,k-x);
glVertex2i(-y+h,x+k);
glVertex2i(-y+h,k-x);
glVertex2i(-x+h,y+k);
glVertex2i(-x+h,k-y);
}
glEnd();
if(d<0)
d = d + 4*x + 6;
else{
d = d + 4*(x-y) + 10;
y–;
}
}
glFlush(); //send all output to display
}
int main(int argc, char** argv)
{
glutInit(&argc, argv); //initialize the toolkit
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); //set the display mode
glutInitWindowSize(640,480); //set window size
//set window position on screen
glutInitWindowPosition(100,150);
//open the screen window and set the name
glutCreateWindow(“My First Window”);
//register the callback functions
glutDisplayFunc(myDisplay);
myInit();
glutMainLoop(); //go into a perpetual loop
return 1;
}
