How to make some change in this program to Convert to just circle to concentric circles like this

To draw cirlce using Bresenhams MidpointAlgorithm

#include #include #include using namespace std;

int pntX1, pntY1, r;

void plot(int x, int y) { glBegin(GL_POINTS); glVertex2i(x+pntX1, y+pntY1); glEnd(); }

void myInit (void) { glClearColor(1.0, 1.0, 1.0, 0.0); glColor3f(0.0f, 0.0f, 0.0f); glPointSize(4.0); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, 640.0, 0.0, 480.0); }

void midPointCircleAlgo() { int x = 0; int y = r; float decision = 5/4 - r; plot(x, y);

while (y > x) { if (decision

}

void myDisplay(void) { glClear (GL_COLOR_BUFFER_BIT); glColor3f (0.0, 0.0, 0.0); glPointSize(1.0);

midPointCircleAlgo();

glFlush (); }

int main(int argc, char** argv) { cout

cout > pntX1; cout > pntY1; cout > r;

glutInit(&argc, argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); glutInitWindowSize (640, 480); glutInitWindowPosition (100, 150); glutCreateWindow ("Line Drawing Alogrithms"); glutDisplayFunc(myDisplay); myInit (); glutMainLoop();

}

X Circle Mid Point Algorithm