1stLab

//Write a program using openGL to draw some points

#include<windows.h>
#include<stdio.h>
#include<stdlib.h>
#include<GL/glut.h>

void myInit(void)
{
	glClearColor(1.0, 1.0, 1.0, 0.0); //BG color is white
	glColor3f(0.0f,0.0f,0.0f); //drawing color is black
	glPointSize(4.0);// a dot is 2 by 2 pixels

	//init view (simple orthographic projection)
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(-1.0,1.0,-1.0,1.0,-1.0,1.0);
	//set the viewing coordinates
	gluOrtho2D(0.0,640.0,0.0,480.0);
}
void myDisplay(void)
{
	glClear(GL_COLOR_BUFFER_BIT); //clear the screen
	glBegin(GL_POINTS);
	{
		glVertex2i(20,10);
		glVertex2i(50,10);
		glVertex2i(20,80);
		glVertex2i(50,80);
	}
	glEnd();
	glFlush();
}
int main(int argc, char** argv)
{
	glutInit(&argc,argv);//init the toolkit
	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); //set the display
	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;
}