#include<math.h>
#include<glut.h>
#include<stdio.h>

int t = 0;


void myMouse(int b,int s,int x,int y)
{
	if (b == GLUT_LEFT_BUTTON && s == GLUT_DOWN)
	{
		glClearColor(0, 0, 0, 0);
		glClear(GL_COLOR_BUFFER_BIT);

	}
}
void display()
{

	glClearColor(0, 0, 0, 0);
	glClear(GL_COLOR_BUFFER_BIT);
	

	glBegin(GL_LINES);
	glColor3f(1, 0, 1);
	glPointSize(3);
	glVertex2i(-250, -250);
	glVertex2i(250, 250);
	

	glEnd();
	glFlush();

	glutSwapBuffers();
}
void init()
{
	glMatrixMode(GL_PROJECTION_MATRIX);
	glLoadIdentity();
	glOrtho(-500, 500, -500, 500, -500, 500);
	glMatrixMode(GL_MODELVIEW);
}
int main()
{
	//glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
	glutInitWindowSize(500, 500);
	glutCreateWindow("line");
	init();
	glutDisplayFunc(display);
	glutMouseFunc(myMouse);
	glutMainLoop();
	return 0;
}