// radial.cpp
// Author:  Kelly Debure
// Program to demonstrate the creation of radially symmetric polygons using triangle fans.

#include <GL/glut.h>
#include <math.h>

float d=0;
const float DEG2RAD = M_PI /180.0;

void mydisplay(){
	glClear(GL_COLOR_BUFFER_BIT);

	float degOfrotation=0;

	glBegin(GL_TRIANGLE_FAN);     // make a diamond using a triangle fan primitive
		glColor3ub(125,255,255);
		glVertex2f(0,0);
		float r = 0.5;
		for(int j=0; j<=360; j+=90){
			degOfrotation = j*DEG2RAD;
			glVertex2f(((cos(degOfrotation)*r)),((sin(degOfrotation)*r)));
		}
	glEnd();

	glFlush();
}


int main(int argc, char** argv){
	glutInit(&argc, argv);
	glutInitWindowSize(500, 500);
	glutCreateWindow("Radial Symmetry");
	glutDisplayFunc(mydisplay);
	glutMainLoop();
	return 0;
}