//drawDot
//drawing dots with the given function drawDot()
// T. Kosaka CS TNCT 2001

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

void setColor(float red,float green,float blue)
{
    glColor3f(red, green, blue);    
}

void drawDot(int x,int y)
{
    glBegin(GL_POINTS);
        glVertex2i(x, y);
    glEnd();
}

void userdraw(void);

void display(void)
{
    glClear( GL_COLOR_BUFFER_BIT);
    userdraw();
    glutSwapBuffers();
}

void userdraw(void)
{
    setColor(1,1,1);
    drawDot(50,400);
    drawDot(50,350);
    drawDot(50,300);
    drawDot(100,400);
    drawDot(100,350);
}

int main(int argc, char **argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode ( GLUT_DOUBLE | GLUT_RGB );
    glutInitWindowPosition(100,100);
    glutInitWindowSize(640,480);
    glutCreateWindow ("putPixel");
    glClearColor(0.0, 0.0, 0.0, 0.0);
    gluOrtho2D(0., 640., 0.0, 480.0);
      // Define the dimensions of the Orthographic Viewing Volume
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;
}