This document provides information about an orientation program on computer graphics laboratory with a mini project at Atria Institute of Technology. It outlines the course learning objectives which include demonstrating algorithms using OpenGL graphics primitives, implementing line drawing and clipping algorithms with OpenGL, and designing geometric transformations on 2D and 3D objects. It also describes the course outcomes, examination process, mark distribution, and getting started with OpenGL by introducing basic concepts and providing example programs for drawing a rectangle and circle.

1. ORIENTATION PROGRAMME
ON
18CSL67
Computer Graphics Laboratory
with Mini Project

2. Course Learning Objectives
❖Demonstrate simple algorithms using OpenGL Graphics
Primitives and attributes.
❖Implementation of line drawing and clipping algorithms
using OpenGL functions
❖Design and implementation of algorithms Geometric
transformations on both 2D and 3D objects.

4. Course Outcomes
❖ Apply the concepts of computer graphics ˆ
❖ Implement computer graphics applications using OpenGL
❖ Ânimate real world problems using OpenGL

5. Conduction of Examination
• All laboratory experiments from part A are to be included for
practical examination.
• Report should be prepared in a standard format prescribed for
project work
• Students are allowed to pick one experiment from the lot.
Mark Distribution
• Part A – Procedure + Execution + Viva = 6 + 28 + 6 = 40 Marks
• Part B – Procedure + Execution + Viva = 9 + 42 + 9 = 60 Marks

6. Getting Started with OpenGL
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7. OPENGL _INTRODUCTION
• Open Graphics Library (OpenGL) is a cross-language (language
independent), cross-platform (platform-independent) API for
rendering 2D and 3D Vector Graphics(use of polygons to represent
image).
• Mesa3D : Open Source for OpenGL
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8. Major graphics operations which OpenGL performs to
render an image on the screen.
• Construct shapes from geometric primitives, thereby creating mathematical
descriptions of objects. (OpenGL considers points, lines, polygons, images,
and bitmaps to be primitives.)
• Arrange the objects in three-dimensional space and select the desired
vantage point for viewing the composed scene.
• Calculate the color of all the objects
• Convert the mathematical description of objects and their associated color
information to pixels on the screen. This process is called rasterization.
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9. Example Program
White Rectangle on a Black Background
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10. Atria Institute of Technology

11. Header Files
• #include <GL/gl.h>
• #include <GL/glu.h>
• #include <GL/glut.h>
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12. How to Program?
Installation on Ubuntu :
sudo apt-get install freeglut3-dev
Design
1. Open the terminal.
2. Create your own directory using "mkdir 1ATXXCSXXX". THIS
IS ONE TIME INSTRUCTION.
3. "cd 1ATXXCSXXX“
4. "gedit 1.cpp"
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13. How to Program?
Running Command :
gcc filename.c -lGL -lGLU -lglut
gcc 1.cpp -lGL -lGLU -lglut
./a.out
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14. For windows : Code::Block : Ready to test
OpenGL , Visual Studio
Installation of code block reference :
https://www.youtube.com/watch?v=NPcnymtP
2SE
Code Block :
• https://www.youtube.com/watch?v=wAl3tRdbtI
0
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15. Steps for program
Declare the graphic driver and graphic mode variable.
Initialize the graphic driver
Initialize the graph and set the path to the graphic support.
Draw the line
Close the graph.

16. Sample program on Line
#include <stdio.h>
#include <conio.h>
#include <graphics.h>
#include <stdlib.h>
int main()
{
int gdriver, gmode, userpattern;
int x, y, x_max, y_max;
gdriver = DETECT;
userpattern = 1;
initgraph(&gdriver, &gmode, "D:TURBOC3BGI");
setlinestyle(DOTTED_LINE,userpattern, 3);
x = 100;
y = 70;
x_max = 350;
y_max = 70;
line(x, y, x_max, y_max);
getch();
closegraph();

17. Sample Program on Rectangle
#include <graphics.h>
int main()
{
int gd = DETECT, gm;
int left = 150, top = 150;
int right = 450, bottom = 450;
initgraph(&gd, &gm, ""
rectangle(left, top, right, bottom);
getch();
closegraph();
return 0;
}

18. sample program on Circle
#include<stdio.h>
#include<graphics.h>
#include<conio.h>
int main(){
int gd = DETECT,gm;
int x ,y ,radius=80;
initgraph(&gd, &gm, "C:TCBGI");
/* Initialize center of circle with center of screen */
x = getmaxx()/2;
y = getmaxy()/2;
outtextxy(x-100, 50, "CIRCLE Using Graphics in C");
/* Draw circle on screen */
circle(x, y, radius);
getch();
closegraph();
return 0;
}