3-BresenhamCircleDrawingAlgo.cpp

#include <windows.h>
#include <gl/glut.h>
#include <iostream>
#include <cmath>
#include "./custom-headers/Point.h"
#include "./openGL-comp/HelperDrawerMethod.h"
#include "./algos/3-BresenhamCircleAlgo.h"

using namespace std;

int cx1 = 0, cy1 = 0, r;

void myInit()
{
	glClearColor(1.0, 1.0, 1.0, 1.0);
	glClear(GL_COLOR_BUFFER_BIT);
	glMatrixMode(GL_PROJECTION);
	gluOrtho2D(0, 500, 0, 500);
	glColor3f(0.0, 0.0, 0.0);
}

void myDisplay()
{
	int offsetX = 250, offsetY = 250; // origin at (250,250)
	RGBColor color(0, 0, 0, 1);
	auto points = bresenhamCircleAlgo(r);
	drawPixels<int>(points, color, cx1 + offsetX, cy1 + offsetY);
	glFlush();
}

void myMouse(int button, int state, int x, int y)
{
	if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
	{
		cx1 = x, cy1 = y;
		glutPostRedisplay();
	}
}

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

	cout << "Enter the coordinates of the center:\n\n"
		 << endl;

	cout << "X-coordinate   : ";
	cin >> cx1;
	cout << "\nY-coordinate : ";
	cin >> cy1;
	cout << "\nEnter radius : ";
	cin >> r;
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(500, 500);
	glutInitWindowPosition(0, 0);
	glutCreateWindow("- Bresenham's Circle Drawing -");
	myInit();
	glutDisplayFunc(myDisplay);
	glutMouseFunc(myMouse);
	glutMainLoop();

	return 0;
}