# Questions –
Assignment 3: Plotting points
Q1.) Study the following functions of OpenGL:
a) glutInit( )
b) glutInitDisplayMode( )
c) glutInitWindowSize( )
d) glutInitWindowPosition( )
e) glutCreateWindow( )
f) gluOrtho2D( )
g) glCleanColor( )
h) glColor3f( )
Q2.) Run and study the following program.
#include <GL/glut.h>
void myInit(void)
{ glClearColor(1.0,1.0,1.0,0.0);
glColor3f(0.0f,0.0f,0.0f);
glPointSize(4.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0,640.0,0.0,480.0); }
void myDisplay(void)
{ glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_POINTS); glVertex2i(100, 50);
glVertex2i(100, 130);
glVertex2i(150, 130);
glEnd();
glFlush();
}
void main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); glutInitWindowSize(640,480);
glutInitWindowPosition(100, 150);
glutCreateWindow(“My first program”);
glutDisplayFunc(myDisplay);
myInit();
glutMainLoop();
}
Q3.) Modify the above program to locate the origin (0, 0) of the created window, and also the origin (0, 0) of your screen.
Q4.) Write a program to create a window, in which origin is at middle position.
Q5.) Write a program to plot points, whose coordinates are given by the user through Mouse.
Q6.) Write a program to draw a set of lines, in which end points are given by the user through Mouse or Keyboard.
by the user through Mouse/Keyboard.
